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Wolf MTF, Bonsib SM, Larsen CP, Hildebrandt F. Nephronophthisis: a pathological and genetic perspective. Pediatr Nephrol 2024; 39:1977-2000. [PMID: 37930417 DOI: 10.1007/s00467-023-06174-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 09/08/2023] [Accepted: 09/08/2023] [Indexed: 11/07/2023]
Abstract
Nephronophthisis (NPHP) is an autosomal recessive cystic kidney disease and is one of the most frequent genetic causes for kidney failure (KF) in children and adolescents. Over 20 genes cause NPHP and over 90 genes contribute to renal ciliopathies often involving multiple organs. About 15-20% of NPHP patients have additional extrarenal symptoms affecting other organs than the kidneys. The involvement of additional organ systems in syndromic forms of NPHP is explained by shared expression of most NPHP gene products in centrosomes and primary cilia, a sensory organelle present in most mammalian cells. This finding resulted in the classification of NPHP as a ciliopathy. If extrarenal symptoms are present in addition to NPHP, these disorders are defined as NPHP-related ciliopathies (NPHP-RC) and can involve the retina (e.g., with Senior-Løken syndrome), CNS (central nervous system) (e.g., with Joubert syndrome), liver (e.g., Boichis and Arima syndromes), or bone (e.g., Mainzer-Saldino and Sensenbrenner syndromes). This review focuses on the pathological findings and the recent genetic advances in NPHP and NPHP-RC. Different mechanisms and signaling pathways are involved in NPHP ranging from planar cell polarity, sonic hedgehog signaling (Shh), DNA damage response pathway, Hippo, mTOR, and cAMP signaling. A number of therapeutic interventions appear to be promising, ranging from vasopressin receptor 2 antagonists such as tolvaptan, cyclin-dependent kinase inhibitors such as roscovitine, Hh agonists such as purmorphamine, and mTOR inhibitors such as rapamycin.
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Affiliation(s)
- Matthias T F Wolf
- Division of Pediatric Nephrology, University of Texas, Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX, 75390, USA.
- Division of Pediatric Nephrology, C.S. Mott Children's Hospital, University of Michigan, 1150 W. Medical Center Dr, Ann Arbor, MI, 48109, USA.
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Pang J, Kong F, Tang W, Xi H, Ma N, Sheng X, Peng Y, Liu Z. Two novel TMEM67 variations in a Chinese family with recurrent pregnancy loss: a case report. BMC Med Genomics 2024; 17:156. [PMID: 38844949 PMCID: PMC11155110 DOI: 10.1186/s12920-024-01902-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Accepted: 05/06/2024] [Indexed: 06/10/2024] Open
Abstract
BACKGROUND Recurrent pregnancy loss (RPL) is a common pregnancy complication that brings great pain to pregnant women and their families. Genetic factors are an important cause reason of RPL. However, clinical research on monogenic diseases with recurrent miscarriage is insufficient. CASE PRESENTATION Here we reported a Chinese family with RPL and genetic analysis of the abortion and parents. A paternally inherited heterozygous missense variant c.1415T > G (p.V472G) and a maternally inherited heterozygous nonsense variant c.2314del (p.M772*) in TMEM67 gene were identified by trio-exome sequencing. c.2314del (p.M772*) generated a premature stop codon and truncated protein, was classified as "pathogenic". c.1415T > G (p.V472G) located in extra-cellular region, was classified as "likely pathogenic". Biallelic variants in TMEM67 gene cause lethal Meckel syndrome 3, consistent with the proband's prenatal phenotype. CONCLUSION The current study of the Chinese family expands the pathogenic variant spectrum of TMEM67 and emphasizes the necessity of exome sequencing in RPL condition.
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Affiliation(s)
- Jialun Pang
- Department of Medical Genetics, Maternal and Child Health Hospital of Hunan Province, 58 Xiangchun Road, Changsha, 410078, Hunan, China
| | - Fanjuan Kong
- Medical Record Management Department, Maternal and Child Health Hospital of Hunan Province, Changsha, Hunan, China
| | - Wanglan Tang
- Department of Medical Genetics, Maternal and Child Health Hospital of Hunan Province, 58 Xiangchun Road, Changsha, 410078, Hunan, China
| | - Hui Xi
- Department of Medical Genetics, Maternal and Child Health Hospital of Hunan Province, 58 Xiangchun Road, Changsha, 410078, Hunan, China
| | - Na Ma
- Department of Medical Genetics, Maternal and Child Health Hospital of Hunan Province, 58 Xiangchun Road, Changsha, 410078, Hunan, China
| | - Xiaoqi Sheng
- NHC Key Laboratory of Birth Defect for Research and Prevention, Maternal and Child Health Hospital of Hunan Province, Changsha, Hunan, China
| | - Ying Peng
- Department of Medical Genetics, Maternal and Child Health Hospital of Hunan Province, 58 Xiangchun Road, Changsha, 410078, Hunan, China.
| | - Zhiyu Liu
- Appropriate Technology Extension Training Centre, Maternal and Child Health Hospital of Hunan Province, Changsha, Hunan, China.
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Owens JW, Hopkin RJ, Martin LJ, Kodani A, Simpson BN. Phenotypic variability in Joubert syndrome is partially explained by ciliary pathophysiology. Ann Hum Genet 2024; 88:86-100. [PMID: 37921557 DOI: 10.1111/ahg.12537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 10/10/2023] [Accepted: 10/16/2023] [Indexed: 11/04/2023]
Abstract
INTRODUCTION Joubert syndrome (JS) arises from defects of primary cilia resulting in potential malformations of the brain, kidneys, eyes, liver, and limbs. Several of the 35+ genes associated with JS have recognized genotype/phenotype correlations, but most genes have not had enough reported individuals to draw meaningful conclusions. METHODS A PubMed literature review identified 688 individuals with JS across 32 genes and 112 publications to bolster known genotype/phenotype relationships and identify new correlations. All included patients had the "molar tooth sign" and a confirmed genetic diagnosis. Individuals were categorized by age, ethnicity, sex and the presence of developmental disability/intellectual disability, hypotonia, abnormal eye movements, ataxia, visual impairment, renal impairment, polydactyly, and liver abnormalities. RESULTS Most genes demonstrated unique phenotypic profiles. Grouping proteins based on physiologic interactions established stronger phenotypic relationships that reflect known ciliary pathophysiology. Age-stratified data demonstrated that end-organ disease is progressive in JS. Most genes demonstrated a significant skew towards having variants with either residual protein function or no residual protein function. CONCLUSION This cohort demonstrates that clinically meaningful genotype/phenotype relationships exist within most JS-related genes and can be referenced to allow for more personalized clinical care.
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Affiliation(s)
- Joshua W Owens
- UPMC Children's Hospital of Pittsburgh Division of Genetic and Genomic Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
- Department of Pediatrics, Cincinnati Children's Hospital Medical Center Division of Human Genetics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Robert J Hopkin
- Department of Pediatrics, Cincinnati Children's Hospital Medical Center Division of Human Genetics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Lisa J Martin
- Department of Pediatrics, Cincinnati Children's Hospital Medical Center Division of Human Genetics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Andrew Kodani
- Department of Cell and Molecular Biology, Center for Pediatric Neurological Disease Research, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Brittany N Simpson
- Department of Pediatrics, Cincinnati Children's Hospital Medical Center Division of Human Genetics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
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Zhang Q, Yang S, Chen X, Wang H, Li K, Zhang C, Liao S, Qin L, Hou Q. Identification of novel TMEM231 gene splice variants and pathological findings in a fetus with Meckel Syndrome. Front Genet 2023; 14:1252873. [PMID: 37736303 PMCID: PMC10509762 DOI: 10.3389/fgene.2023.1252873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Accepted: 08/22/2023] [Indexed: 09/23/2023] Open
Abstract
Background: Meckel Syndrome (MKS, OMIM #249000) is a rare and fatal autosomal recessive ciliopathy with high clinical and genetic heterogeneity. MKS shows complex allelism with other related ciliopathies such as Joubert Syndrome (JBTS, OMIM #213300). In MKS, the formation and function of the primary cilium is defective, resulting in a multisystem disorder including occipital encephalocele, polycystic kidneys, postaxial polydactyly, liver fibrosis, central nervous system malformations and genital anomalies. This study aimed to analyze the genotype of MKS patients and investigate the correlation between genotype and phenotype. Methods: A nonconsanguineous couple who conceived four times with a fetus affected by multiorgan dysfunction and intrauterine fetal death was studied. Whole exome sequencing (WES) was performed in the proband to identify the potentially pathogenic variant. Sanger sequencing was performed in family members. In silico tools were used to analyse the pathogenicity of the identified variants. cDNA TA-cloning sequencing was performed to validate the effects of intronic variants on mRNA splicing. Quantitative real-time PCR was performed to investigate the effect of the variants on gene expression. Immunofluorescence was performed to observe pathological changes of the primary cilium in kidney tissue from the proband. Results: Two splice site variants of TMEM231 (NM_001077418.2, c.583-1G>C and c.583-2_588delinsTCCTCCC) were identified in the proband, and the two variants have not been previously reported. The parents were confirmed as carriers. The two variants were predicted to be pathogenic by in silico tools and were classified as pathogenic/likely pathogenic variants according to the American College of Medical Genetics and Genomics guideline. cDNA TA cloning analysis showed that both splice site variants caused a deletion of exon 5. RT-PCR revealed that the expression of TMEM231 was significantly decreased and immunofluorescence showed that the primary cilium was almost absent in the proband's kidney tissue. Conclusion: We reported the clinical, genetic, molecular and histochemical characterisation of a family affected by MKS. Our findings not only extended the mutation spectrum of the TMEM231 gene, but also revealed for the first time the pathological aetiology of primary cilia in humans and provide a basis for genetic counselling of the parents to their offspring.
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Affiliation(s)
- Qian Zhang
- Henan Provincial Key Laboratory of Genetic Diseases and Functional Genomics, Henan Provincial People’s Hospital, Medical Genetics Institute of Henan Province, People’s Hospital of Zhengzhou University, Zhengzhou University, Zhengzhou, China
- National Health Commission Key Laboratory of Birth Defects Prevention, Henan Key Laboratory of Population Defects Prevention, Zhengzhou, China
| | - Shuya Yang
- People’s Hospital of Henan University, Henan University, Zhengzhou, China
| | - Xin Chen
- Henan Provincial Key Laboratory of Genetic Diseases and Functional Genomics, Henan Provincial People’s Hospital, Medical Genetics Institute of Henan Province, People’s Hospital of Zhengzhou University, Zhengzhou University, Zhengzhou, China
- National Health Commission Key Laboratory of Birth Defects Prevention, Henan Key Laboratory of Population Defects Prevention, Zhengzhou, China
| | - Hongdan Wang
- Henan Provincial Key Laboratory of Genetic Diseases and Functional Genomics, Henan Provincial People’s Hospital, Medical Genetics Institute of Henan Province, People’s Hospital of Zhengzhou University, Zhengzhou University, Zhengzhou, China
- National Health Commission Key Laboratory of Birth Defects Prevention, Henan Key Laboratory of Population Defects Prevention, Zhengzhou, China
| | - Keyan Li
- National Health Commission Key Laboratory of Birth Defects Prevention, Henan Key Laboratory of Population Defects Prevention, Zhengzhou, China
| | - Chaonan Zhang
- National Health Commission Key Laboratory of Birth Defects Prevention, Henan Key Laboratory of Population Defects Prevention, Zhengzhou, China
| | - Shixiu Liao
- Henan Provincial Key Laboratory of Genetic Diseases and Functional Genomics, Henan Provincial People’s Hospital, Medical Genetics Institute of Henan Province, People’s Hospital of Zhengzhou University, Zhengzhou University, Zhengzhou, China
- National Health Commission Key Laboratory of Birth Defects Prevention, Henan Key Laboratory of Population Defects Prevention, Zhengzhou, China
| | - Litao Qin
- Henan Provincial Key Laboratory of Genetic Diseases and Functional Genomics, Henan Provincial People’s Hospital, Medical Genetics Institute of Henan Province, People’s Hospital of Zhengzhou University, Zhengzhou University, Zhengzhou, China
- National Health Commission Key Laboratory of Birth Defects Prevention, Henan Key Laboratory of Population Defects Prevention, Zhengzhou, China
| | - Qiaofang Hou
- Henan Provincial Key Laboratory of Genetic Diseases and Functional Genomics, Henan Provincial People’s Hospital, Medical Genetics Institute of Henan Province, People’s Hospital of Zhengzhou University, Zhengzhou University, Zhengzhou, China
- National Health Commission Key Laboratory of Birth Defects Prevention, Henan Key Laboratory of Population Defects Prevention, Zhengzhou, China
- People’s Hospital of Henan University, Henan University, Zhengzhou, China
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Sambharia M, Freese ME, Donato F, Bathla G, Abukhiran IMM, Dantuma MI, Mansilla MA, Thomas CP. Suspected Autosomal Recessive Polycystic Kidney Disease but Cerebellar Vermis Hypoplasia, Oligophrenia Ataxia, Coloboma, and Hepatic Fibrosis (COACH) Syndrome in Retrospect, A Delayed Diagnosis Aided by Genotyping and Reverse Phenotyping: A Case Report and A Review of the Literature. Nephron Clin Pract 2023; 148:264-272. [PMID: 36617405 DOI: 10.1159/000527991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Accepted: 10/20/2022] [Indexed: 01/07/2023] Open
Abstract
The clinical features of cerebellar vermis hypoplasia, oligophrenia, ataxia, coloboma, and hepatic fibrosis (COACH) characterize the rare autosomal recessive multisystem disorder called COACH syndrome. COACH syndrome belongs to the spectrum of Joubert syndrome and related disorders (JSRDs) and liver involvement distinguishes COACH syndrome from the rest of the JSRD spectrum. Developmental delay and oculomotor apraxia occur early but with time, these can improve and may not be readily apparent or no longer need active medical management. Congenital hepatic fibrosis and renal disease, on the other hand, may develop late, and the temporal incongruity in organ system involvement may delay the recognition of COACH syndrome. We present a case of a young adult presenting late to a Renal Genetics Clinic for evaluation of renal cystic disease with congenital hepatic fibrosis, clinically suspected to have autosomal recessive polycystic kidney disease. Following genetic testing, a reevaluation of his medical records from infancy, together with reverse phenotyping and genetic phasing, led to a diagnosis of COACH syndrome.
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Affiliation(s)
- Meenakshi Sambharia
- Division of Nephrology, Department of Internal Medicine, University of Iowa, Iowa City, Iowa, USA
| | - Margaret E Freese
- Division of Nephrology, Department of Internal Medicine, University of Iowa, Iowa City, Iowa, USA
| | - Francisco Donato
- Department of Radiology, University of Iowa, Iowa City, Iowa, USA
| | - Girish Bathla
- Department of Radiology, University of Iowa, Iowa City, Iowa, USA
| | | | - Maisie I Dantuma
- The Iowa Institute of Human Genetics, University of Iowa, Iowa City, Iowa, USA
| | - M Adela Mansilla
- The Iowa Institute of Human Genetics, University of Iowa, Iowa City, Iowa, USA
| | - Christie P Thomas
- Division of Nephrology, Department of Internal Medicine, University of Iowa, Iowa City, Iowa, USA
- The Iowa Institute of Human Genetics, University of Iowa, Iowa City, Iowa, USA
- Department of Pediatrics, College of Medicine, University of Iowa, Iowa City, Iowa, USA
- Veterans Affairs Medical Center, Iowa City, Iowa, USA
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Huang LX, Lu XG, Liu JX, Xu L, Shang N, Guo L, OuYang YC. Case report and a brief review: Analysis and challenges of prenatal imaging phenotypes and genotypes in Joubert syndrome. Front Genet 2022; 13:1038274. [DOI: 10.3389/fgene.2022.1038274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Accepted: 10/31/2022] [Indexed: 11/21/2022] Open
Abstract
Prenatal imaging phenotypes and genotypes were analyzed in 13 cases prenatally diagnosed with Joubert syndrome (JS), all of which underwent magnetic resonance imaging (MRI), ultrasound, and genetic testing. Prenatal MRI diagnosed 10 cases as JS with a typical molar tooth sign (MTS), while prenatal ultrasound diagnosed or suspiciously diagnosed 11 cases as JS with typical or mild MTS in 10 cases. Mutations in JS-related genes and other prenatal JS imaging phenotypes were identified in 10 cases, including OFD1 in two cases [cerebellar vermis (CV) absence, posterior fossa dilation, ventriculomegaly, polydactyly, malformations of cortical development (MCD), and persistent left superior vena cava], TMEM67 in two cases (CV absence, polydactyly, hyperechoic kidneys or polycystic kidneys, posterior fossa dilation, and ventriculomegaly), CC2D2A in two cases (CV absence, polydactyly, MCD, agenesis of the corpus callosum, encephalocele and hydrocephalus, ventriculomegaly, and posterior fossa dilation), RPGRIP1L in one case (CV absence), TCTN3 in one case (CV absence, polydactyly, MCD, and posterior fossa dilation), CEP290 in one case (CV absence and polycystic kidney), and NPHP1 in one case (CV absence). The prenatal diagnosis of JS presents a number of challenges, including the variants of unknown significance, the lack of functional assessment in prenatal imaging, unclear phenotype–genotype relationships in prenatal evaluation, and the incorrect identification of the JS hallmark, the MTS, in prenatal imaging, especially on ultrasound. Although combined MRI, ultrasound, and exome sequencing could help improve the prenatal diagnosis of JS, there still exist significant challenges.
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Wang D, Chen X, Wen Q, Li Z, Chen W, Chen W, Wang X. A single heterozygous nonsense mutation in the TTC21B gene causes adult-onset nephronophthisis 12: A case report and review of literature. Mol Genet Genomic Med 2022; 10:e2076. [PMID: 36263627 PMCID: PMC9747551 DOI: 10.1002/mgg3.2076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 09/25/2022] [Accepted: 09/30/2022] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND Nephronophthisis type 12 (NPHP 12) is a rare cilia-related cystic kidney disease, caused by TTC21B mutation, mainly involving the kidneys, which generally occurs in children. Our study aimed to illustrate its clinical, pathological and genetic characteristics by reporting an adult-onset case of NPHP 12 caused by a single heterozygous nonsense mutation of TTC21B confirmed by renal histology and whole exome sequencing and reviewing related literature with a comparative analysis of the clinical features of each case. It will further increase the recognition of this rare kidney genetic disease, which sometimes can manifest as an adult disease. RESULTS A 33-years-old man showed a chronic disease course, and he exhibited slight renal dysfunction (CKD stage 3, eGFR = 49 ml/[min* 1.73 m2]) with renal tubular proteinuria, without any extrarenal manifestations, congenital malformation history of kidney disease, or family hereditary disease. Renal histological findings showed substantial interstitial fibrosis with some irregular and tortuous tubules with complex branches and segmental thickening and splitting of the tubular basement membrane. The patient was diagnosed with chronic interstitial nephritis for an unknown reason clinically. Further genetic analysis revealed a single heterozygous nonsense mutation in the TTC21B gene and NPHP 12 was diagnosed finally. CONCLUSION A single heterozygous mutation in the TTC21B gene may cause atypical NPHP12, which had a relatively later onset and milder clinical symptoms without developmental abnormalities. Therefore, for unexplained adult-onset chronic interstitial nephritis with unusual changes of renal tubules and interstitial fibrosis, even without a clear history of hereditary kidney disease, genetic testing is still recommended. The correct diagnosis of this rare adult-onset hereditary nephropathy can avoid unnecessary treatment.
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Affiliation(s)
- Dan Wang
- Department of NephrologyThe First Affiliated Hospital, Sun Yat‐sen UniversityGuangzhouChina,NHC Key Laboratory of Clinical Nephrology (Sun Yat‐sen University) and Guangdong Provincial Key Laboratory of NephrologySun Yat‐sen UniversityGuangzhouChina
| | - Xionghui Chen
- Department of NephrologyThe First Affiliated Hospital, Sun Yat‐sen UniversityGuangzhouChina,NHC Key Laboratory of Clinical Nephrology (Sun Yat‐sen University) and Guangdong Provincial Key Laboratory of NephrologySun Yat‐sen UniversityGuangzhouChina
| | - Qiong Wen
- Department of NephrologyThe First Affiliated Hospital, Sun Yat‐sen UniversityGuangzhouChina,NHC Key Laboratory of Clinical Nephrology (Sun Yat‐sen University) and Guangdong Provincial Key Laboratory of NephrologySun Yat‐sen UniversityGuangzhouChina
| | - Zhijian Li
- Department of NephrologyThe First Affiliated Hospital, Sun Yat‐sen UniversityGuangzhouChina,NHC Key Laboratory of Clinical Nephrology (Sun Yat‐sen University) and Guangdong Provincial Key Laboratory of NephrologySun Yat‐sen UniversityGuangzhouChina
| | - Wei Chen
- Department of NephrologyThe First Affiliated Hospital, Sun Yat‐sen UniversityGuangzhouChina,NHC Key Laboratory of Clinical Nephrology (Sun Yat‐sen University) and Guangdong Provincial Key Laboratory of NephrologySun Yat‐sen UniversityGuangzhouChina
| | - Wenfang Chen
- Department of NephrologyThe First Affiliated Hospital, Sun Yat‐sen UniversityGuangzhouChina,Department of PathologyThe First Affiliated Hospital, Sun Yat‐sen UniversityGuangzhouChina
| | - Xin Wang
- Department of NephrologyThe First Affiliated Hospital, Sun Yat‐sen UniversityGuangzhouChina,NHC Key Laboratory of Clinical Nephrology (Sun Yat‐sen University) and Guangdong Provincial Key Laboratory of NephrologySun Yat‐sen UniversityGuangzhouChina
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Peng M, Han S, Sun J, He X, Lv Y, Yang L. Evaluation of novel compound variants of CEP290 in prenatally suspected case of Meckel syndrome through whole exome sequencing. Mol Genet Genomic Med 2022; 10:e1935. [PMID: 35352487 PMCID: PMC9034663 DOI: 10.1002/mgg3.1935] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Revised: 02/16/2022] [Accepted: 03/17/2022] [Indexed: 11/29/2022] Open
Abstract
Background Meckel syndrome (MKS) is a fatal disease characterized by multisystem fibrosis during the prenatal or perinatal period. It has an autosomal recessive genetic pattern and is characterized by meningo occipital encephalocele, polycystic kidney dysplasia, polydactyly, and hepatobiliary ductal plate malformation. Germline variations in CEP290 have been shown to cause MKS4. Methods In this study, a 23‐year‐old Chinese woman who was 18 weeks pregnant was examined. The pregnancy was terminated due to occipital meningocele and enlarged cystic dysplastic kidney revealed by ultrasonography. In addition, the patient had a history of adverse pregnancy whereby the fetus presented with double kidney enlargement. Karyotype analysis and chromosomal microarray examination (CMA) were carried out using amniotic fluid samples. Whole exome sequencing (WES) was performed using tissue specimens of the aborted fetus. Results Karyotype and CMA analyses showed normal results. However, compound heterozygous mutations of CEP290 c.3175dup and CEP290 c.1201dup were detected through WES. CEP290 c.1201dup is a novel heterozygous mutation of CEP290 that has not been reported previously. Conclusions The findings of this study provide information on the correlation between MKS phenotype and genotype in CEP290. In addition, these findings indicate that WES is an effective method for detecting genetic causes of multiple structural defects especially those showing normal karyotype and CMA results.
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Affiliation(s)
- Meilian Peng
- Center for Reproductive Medicine, Department of Obstetrics, Zhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College), Hangzhou, China
| | - Shuai Han
- Center for Reproductive Medicine, Department of Obstetrics, Zhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College), Hangzhou, China
| | - Juan Sun
- Center for Reproductive Medicine, Department of Ultrasound Medicine, Zhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College), Hangzhou, China
| | - Xiaodong He
- Cancer Center, Department of Radiology, Zhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College), Hangzhou, China
| | - Yaer Lv
- Center for Reproductive Medicine, Department of Ultrasound Medicine, Zhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College), Hangzhou, China
| | - Liwei Yang
- Center for Reproductive Medicine, Department of Obstetrics, Zhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College), Hangzhou, China
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Wallmeier J, Dallmayer M, Omran H. The role of cilia for hydrocephalus formation. AMERICAN JOURNAL OF MEDICAL GENETICS. PART C, SEMINARS IN MEDICAL GENETICS 2022; 190:47-56. [PMID: 35470956 DOI: 10.1002/ajmg.c.31972] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 04/06/2022] [Accepted: 04/07/2022] [Indexed: 06/14/2023]
Abstract
Hydrocephalus is a common finding in newborns. In most cases, it is caused by intraventricular hemorrhage associated with prematurity, whereas in some patients the cause of hydrocephalus can be traced back to genetic changes, associated with disease syndromes such as RASopathies, lysosomal storage diseases, dystroglycanopathies, craniosynostosis but also ciliopathies. Ciliopathies are a group of diseases that can affect multiple organ systems due to dysfunction or the absence of cilia. Cilia are small organelles, extending from the cell surface. Nonmotile monocilia are ubiquitously present during cell development fulfilling chemosensory functions, whereas specialized epithelia such as the ependyma, lining the inner surface of the brain ventricles, exhibit multiciliated cells propelling fluids along the cell surface. This review highlights ciliopathies and their pathophysiology in congenital hydrocephalus. While nonmotile ciliopathies are often associated with severe prenatal hydrocephalus combined with other severe congenital brain malformations, motile ciliopathies, especially those associated with defects in multiciliogenesis can cause hydrocephalus and chronic lung disease.
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Affiliation(s)
- Julia Wallmeier
- Department of General Pediatrics, University Clinic Muenster, Münster, Germany
| | - Marlene Dallmayer
- Department of General Pediatrics, University Clinic Muenster, Münster, Germany
| | - Heymut Omran
- Department of General Pediatrics, University Clinic Muenster, Münster, Germany
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Zhang P, Wu B, Wang Y, Ren Y, Li G, Qan Y, Lei C, Wang H. Identification of Pathogenic Variants in RPGRIP1L with Meckel Syndrome and Preimplantation Genetic Testing in a Chinese Family. Reprod Sci 2022; 29:2200-2207. [PMID: 35233738 DOI: 10.1007/s43032-022-00898-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 02/19/2022] [Indexed: 10/19/2022]
Abstract
Meckel syndrome (MKS, OMIM:249000) is a severe multiorgan dysplastic lethal ciliopathy with extreme genetic heterogeneity. Defects in RPGRIP1L are the cause of MKS type 5 (MKS5, OMIM:611561). However, only six different variants have been reported in eight MKS5 cases with biallelic variants. Here, we describe the case of a Chinese family with recurrent fetal malformations. The proband was a 14-week gestation fetus with occipital encephalocele, polycystic kidneys, polydactyly, and single ventricular heart. Trio whole-exome sequencing was performed, and two novel compound heterozygous variants of RPGRIP1L (c.427C > T, p.Gln143Ter and c.1351-11A > G) were identified. cDNA studies of the splicing variant demonstrated a reading-frame shift with a subsequent premature stop codon (p.Glu451Serfs*6). After the proband was diagnosed with MKS5, the couple chose preimplantation genetic testing for monogenic disorders (PGT-M) and prenatal genetic diagnosis (PND) to prevent the transmission of pathogenic variants, which led to a successful pregnancy recently. In summary, we have identified two novel variants of RPGRIP1L in a Chinese family, which expand the variant spectrum of MKS5. Furthermore, we have described the successful application of PGT-M and PND in this family. These techniques could assist couples with a genetic predisposition in avoiding the transmission of genetic diseases to their offspring.
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Affiliation(s)
- Ping Zhang
- Center for Molecular Medicine, Pediatrics Research Institute, Children's Hospital of Fudan University, Shanghai, China
| | - Bingbing Wu
- Center for Molecular Medicine, Pediatrics Research Institute, Children's Hospital of Fudan University, Shanghai, China
| | - Yaqiong Wang
- Center for Molecular Medicine, Pediatrics Research Institute, Children's Hospital of Fudan University, Shanghai, China
| | - Yunyun Ren
- Department of Ultrasound, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, China
| | - Gang Li
- Center for Molecular Medicine, Pediatrics Research Institute, Children's Hospital of Fudan University, Shanghai, China
| | - Yanyan Qan
- Center for Molecular Medicine, Pediatrics Research Institute, Children's Hospital of Fudan University, Shanghai, China
| | - Caixia Lei
- Prenatal Diagnosis Center, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, China. .,Department of Genetics, Shanghai JiAi Genetics & IVF Institute, Shanghai, China.
| | - Huijun Wang
- Center for Molecular Medicine, Pediatrics Research Institute, Children's Hospital of Fudan University, Shanghai, China.
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11
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Gana S, Serpieri V, Valente EM. Genotype-phenotype correlates in Joubert syndrome: A review. AMERICAN JOURNAL OF MEDICAL GENETICS. PART C, SEMINARS IN MEDICAL GENETICS 2022; 190:72-88. [PMID: 35238134 PMCID: PMC9314610 DOI: 10.1002/ajmg.c.31963] [Citation(s) in RCA: 36] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 02/04/2022] [Accepted: 02/15/2022] [Indexed: 01/20/2023]
Abstract
Joubert syndrome (JS) is a genetically heterogeneous primary ciliopathy characterized by a pathognomonic cerebellar and brainstem malformation, the “molar tooth sign,” and variable organ involvement. Over 40 causative genes have been identified to date, explaining up to 94% of cases. To date, gene‐phenotype correlates have been delineated only for a handful of genes, directly translating into improved counseling and clinical care. For instance, JS individuals harboring pathogenic variants in TMEM67 have a significantly higher risk of liver fibrosis, while pathogenic variants in NPHP1, RPGRIP1L, and TMEM237 are frequently associated to JS with renal involvement, requiring a closer monitoring of liver parameters, or renal functioning. On the other hand, individuals with causal variants in the CEP290 or AHI1 need a closer surveillance for retinal dystrophy and, in case of CEP290, also for chronic kidney disease. These examples highlight how an accurate description of the range of clinical symptoms associated with defects in each causative gene, including the rare ones, would better address prognosis and help guiding a personalized management. This review proposes to address this issue by assessing the available literature, to confirm known, as well as to propose rare gene‐phenotype correlates in JS.
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Affiliation(s)
- Simone Gana
- Neurogenetics Research Center, IRCCS Mondino Foundation, Pavia, Italy
| | | | - Enza Maria Valente
- Neurogenetics Research Center, IRCCS Mondino Foundation, Pavia, Italy.,Department of Molecular Medicine, University of Pavia, Pavia, Italy
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12
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Pollara L, Sottile V, Valente EM. Patient-derived cellular models of primary ciliopathies. J Med Genet 2022; 59:517-527. [DOI: 10.1136/jmedgenet-2021-108315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 01/21/2022] [Indexed: 11/09/2022]
Abstract
Primary ciliopathies are rare inherited disorders caused by structural or functional defects in the primary cilium, a subcellular organelle present on the surface of most cells. Primary ciliopathies show considerable clinical and genetic heterogeneity, with disruption of over 100 genes causing the variable involvement of several organs, including the central nervous system, kidneys, retina, skeleton and liver. Pathogenic variants in one and the same gene may associate with a wide range of ciliopathy phenotypes, supporting the hypothesis that the individual genetic background, with potential additional variants in other ciliary genes, may contribute to a mutational load eventually determining the phenotypic manifestations of each patient. Functional studies in animal models have uncovered some of the pathophysiological mechanisms linking ciliary gene mutations to the observed phenotypes; yet, the lack of reliable human cell models has previously limited preclinical research and the development of new therapeutic strategies for primary ciliopathies. Recent technical advances in the generation of patient-derived two-dimensional (2D) and three-dimensional (3D) cellular models give a new spur to this research, allowing the study of pathomechanisms while maintaining the complexity of the genetic background of each patient, and enabling the development of innovative treatments to target specific pathways. This review provides an overview of available models for primary ciliopathies, from existing in vivo models to more recent patient-derived 2D and 3D in vitro models. We highlight the advantages of each model in understanding the functional basis of primary ciliopathies and facilitating novel regenerative medicine, gene therapy and drug testing strategies for these disorders.
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Barroso‐Gil M, Olinger E, Ramsbottom SA, Molinari E, Miles CG, Sayer JA. Update of genetic variants in CEP120 and CC2D2A-With an emphasis on genotype-phenotype correlations, tissue specific transcripts and exploring mutation specific exon skipping therapies. Mol Genet Genomic Med 2021; 9:e1603. [PMID: 33486889 PMCID: PMC8683696 DOI: 10.1002/mgg3.1603] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 12/18/2020] [Accepted: 01/04/2021] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND Mutations in ciliary genes cause a spectrum of both overlapping and distinct clinical syndromes (ciliopathies). CEP120 and CC2D2A are paradigmatic examples for this genetic heterogeneity and pleiotropy as mutations in both cause Joubert syndrome but are also associated with skeletal ciliopathies and Meckel syndrome, respectively. The molecular basis for this phenotypical variability is not understood but basal exon skipping likely contributes to tolerance for deleterious mutations via tissue-specific preservation of the amount of expressed functional protein. METHODS We systematically reviewed and annotated genetic variants and clinical presentations reported in CEP120- and CC2D2A-associated disease and we combined in silico and ex vivo approaches to study tissue-specific transcripts and identify molecular targets for exon skipping. RESULTS We confirmed more severe clinical presentations associated with truncating CC2D2A mutations. We identified and confirmed basal exon skipping in the kidney, with possible relevance for organ-specific disease manifestations. Finally, we proposed a multimodal approach to classify exons amenable to exon skipping. By mapping reported variants, 14 truncating mutations in 7 CC2D2A exons were identified as potentially rescuable by targeted exon skipping, an approach that is already in clinical use for other inherited human diseases. CONCLUSION Genotype-phenotype correlations for CC2D2A support the deleteriousness of null alleles and CC2D2A, but not CEP120, offers potential for therapeutic exon skipping approaches.
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Affiliation(s)
- Miguel Barroso‐Gil
- Translational and Clinical Research InstituteFaculty of Medical SciencesNewcastle UniversityNewcastle Upon TyneUK
| | - Eric Olinger
- Translational and Clinical Research InstituteFaculty of Medical SciencesNewcastle UniversityNewcastle Upon TyneUK
| | - Simon A. Ramsbottom
- Translational and Clinical Research InstituteFaculty of Medical SciencesNewcastle UniversityNewcastle Upon TyneUK
| | - Elisa Molinari
- Translational and Clinical Research InstituteFaculty of Medical SciencesNewcastle UniversityNewcastle Upon TyneUK
| | - Colin G. Miles
- Translational and Clinical Research InstituteFaculty of Medical SciencesNewcastle UniversityNewcastle Upon TyneUK
| | - John A. Sayer
- Translational and Clinical Research InstituteFaculty of Medical SciencesNewcastle UniversityNewcastle Upon TyneUK
- Renal ServicesThe Newcastle upon Tyne Hospitals NHS Foundation TrustNewcastle Upon TyneUK
- NIHR Newcastle Biomedical Research CentreNewcastle UniversityNewcastle Upon TyneUK
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14
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Liu D, Qian D, Shen H, Gong D. Structure of the human Meckel-Gruber protein Meckelin. SCIENCE ADVANCES 2021; 7:eabj9748. [PMID: 34731008 PMCID: PMC8565905 DOI: 10.1126/sciadv.abj9748] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Mutations in the Meckelin gene account for most cases of the Meckel-Gruber syndrome, the most severe ciliopathy with a 100% mortality rate. Here, we report a 3.3-Å cryo–electron microscopy structure of human Meckelin (also known as TMEM67 and MKS3). The structure reveals a unique protein fold consisting of an unusual cysteine-rich domain that folds as an arch bridge stabilized by 11 pairs of disulfide bonds, a previously uncharacterized domain named β sheet–rich domain, a previously unidentified seven-transmembrane fold wherein TM4 to TM6 are broken near the cytoplasmic surface of the membrane, and a coiled-coil domain placed below the transmembrane domain. Meckelin forms a stable homodimer with an extensive dimer interface. Our structure establishes a framework for dissecting the function and disease mechanisms of Meckelin.
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Affiliation(s)
- Dongliang Liu
- Key Laboratory of Structural Biology of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou, Zhejiang 310024, China
- Westlake Laboratory of Life Sciences and Biomedicine, Hangzhou, Zhejiang 310024, China
- Institute of Biology, Westlake Institute for Advanced Study, Hangzhou, Zhejiang 310024, China
| | - Dandan Qian
- State Key Laboratory of Medicinal Chemical Biology and College of Life Sciences, Nankai University, Tianjin 300350, China
| | - Huaizong Shen
- Key Laboratory of Structural Biology of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou, Zhejiang 310024, China
- Westlake Laboratory of Life Sciences and Biomedicine, Hangzhou, Zhejiang 310024, China
- Institute of Biology, Westlake Institute for Advanced Study, Hangzhou, Zhejiang 310024, China
| | - Deshun Gong
- State Key Laboratory of Medicinal Chemical Biology and College of Life Sciences, Nankai University, Tianjin 300350, China
- Corresponding author.
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Liu Y, Wang H, Jin X, Shao Q, Pan Q. Molecular Diagnosis and Prenatal Phenotype Analysis of Eight Fetuses With Ciliopathies. Front Genet 2021; 12:705808. [PMID: 34675960 PMCID: PMC8523853 DOI: 10.3389/fgene.2021.705808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Accepted: 08/30/2021] [Indexed: 11/13/2022] Open
Abstract
Human ciliopathies are hereditary conditions caused by variants in ciliary-associated genes. Ciliopathies are often characterized by multiple system defects. However, it is not easy to make a definite diagnosis in the prenatal period only based on the imageology. In this report, eight new prenatal cases from five unrelated families diagnosed with ciliopathies were systematically examined. The clinical manifestations of these fetuses showed such prenatal diagnostic features as occipital encephalocele, and polydactyly and polycystic kidneys. Situs inversus caused by CPLANE1 variant was first reported. In Family 1 and Family 3, homozygous variants of CPLANE1 and NPHP4 caused by consanguineous marriage and uniparental disomy were detected by whole-exome sequencing, respectively. In Family 2, Family 4 and Family 5, compound heterozygotes of TMEM67 and DYNC2H1 including two novel missense variants and one novel nonsense variant were identified. The distribution of pathogenic missense variants along TMEM67 gene mainly clustered in the extracellular cysteine rich region, extracellular area with unknown structure, and the transmembrane regions. Genotype-phenotype relationship between CPLANE1 and TMEM67 genes was concluded. This report describes new clinical manifestations and novel variants in CPLANE1, TMEM67, NPHP4, and DYNC2H1.
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Affiliation(s)
- Yuefang Liu
- Department of Clinical Genetics, Huai'an Maternity and Child Clinical College of Xuzhou Medical University, Huai'an, China
| | - Hui Wang
- Reproductive Sciences Institute, Jiangsu University, Zhenjiang, China.,Department of Immunology, Jiangsu Key Laboratory of Medical Science and Laboratory Medicine, School of Medicine, Zhenjiang, China
| | - Xin Jin
- Department of Clinical Genetics, Huai'an Maternity and Child Clinical College of Xuzhou Medical University, Huai'an, China
| | - Qixiang Shao
- Reproductive Sciences Institute, Jiangsu University, Zhenjiang, China.,Department of Immunology, Jiangsu Key Laboratory of Medical Science and Laboratory Medicine, School of Medicine, Zhenjiang, China.,Jiangsu College of Nursing, School of Medical Science and Laboratory Medicine, Huai'an, China
| | - Qiong Pan
- Department of Clinical Genetics, Huai'an Maternity and Child Clinical College of Xuzhou Medical University, Huai'an, China
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16
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Dorval G, Jeanpierre C, Morinière V, Tournant C, Bessières B, Attié-Bittach T, Amiel J, Spaggari E, Ville Y, Merieau E, Gubler MC, Saunier S, Heidet L. Cystic kidney diseases associated with mutations in phosphomannomutase 2 promotor: a large spectrum of phenotypes. Pediatr Nephrol 2021; 36:2361-2369. [PMID: 33580824 DOI: 10.1007/s00467-021-04953-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 12/24/2020] [Accepted: 01/15/2021] [Indexed: 12/12/2022]
Abstract
BACKGROUND Co-occurrence of polycystic kidney disease and hyperinsulinemic hypoglycemia has been reported in children in a few families associated with a variant in the promotor of the PMM2 gene, at position -167 upstream of the coding sequence. PMM2 encodes phosphomannomutase 2, a key enzyme in N-glycosylation. While biallelic coding PMM2 mutations are involved in congenital disorder of glycosylation CDG1A, that particular variant in the promoter of the gene, either in the homozygous state or associated with a mutation in the coding exons of the gene, is thought to restrict the N-glycosylation defect to the kidney and the pancreas. METHODS Targeted exome sequencing of a panel of genes involved in monogenic kidney diseases. RESULTS We identified a PMM2 variant at position -167 associated with a pathogenic PMM2 variant in the coding exons in 3 families, comprising 6 cases affected with a cystic kidney disease. The spectrum of phenotypes was very broad, from extremely enlarged fetal cystic kidneys in the context of a COACH-like syndrome, to isolated cystic kidney disease with small kidneys, slowly progressing toward kidney failure in adulthood. Hypoglycemia was reported only in one case. CONCLUSION These data show that the PMM2 promotor variation, in trans of a PMM2 coding mutation, is associated with a wide spectrum of kidney phenotypes, and is not always associated with extra-renal symptoms. When present, extra-renal defects may include COACH-like syndrome. These data prompt screening of PMM2 in unresolved cases of fetal hyperechogenic/cystic kidneys as well as in cystic kidney disease in children and adults. Graphical Abstract.
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Affiliation(s)
- Guillaume Dorval
- APHP, Service de Génétique moléculaire, Hôpital universitaire Necker-Enfants malades, F-75015, Paris, France
- Laboratory of Hereditary Kidney Diseases, Université de Paris, Imagine Institute, INSERM UMR 1163, F-75015, Paris, France
| | - Cécile Jeanpierre
- Laboratory of Hereditary Kidney Diseases, Université de Paris, Imagine Institute, INSERM UMR 1163, F-75015, Paris, France
| | - Vincent Morinière
- APHP, Service de Génétique moléculaire, Hôpital universitaire Necker-Enfants malades, F-75015, Paris, France
| | - Carole Tournant
- APHP, Service de Génétique moléculaire, Hôpital universitaire Necker-Enfants malades, F-75015, Paris, France
| | - Bettina Bessières
- APHP, Embryofœtopathologie, Service d'Histologie-Embryologie-Cytogénétique, Hôpital universitaire Necker-Enfants malades, F-75015, Paris, France
| | - Tania Attié-Bittach
- APHP, Embryofœtopathologie, Service d'Histologie-Embryologie-Cytogénétique, Hôpital universitaire Necker-Enfants malades, F-75015, Paris, France
- Université de Paris, Imagine Institute, INSERM UMR 1163, F-75015, Paris, France
| | - Jeanne Amiel
- Université de Paris, Imagine Institute, INSERM UMR 1163, F-75015, Paris, France
- APHP, Service de Génétique, Hôpital universitaire Necker-Enfants malades, F-75015, Paris, France
| | - Emmanuel Spaggari
- APHP, Service d'Obstétrique et Médecine fœtale, Hôpital universitaire Necker-Enfants malades, F-75015, Paris, France
| | - Yves Ville
- APHP, Service d'Obstétrique et Médecine fœtale, Hôpital universitaire Necker-Enfants malades, F-75015, Paris, France
- EA 7328, Université de Paris, Paris, France
| | - Elodie Merieau
- Service de Néphrologie pédiatrique, Hôpital universitaire de Tours, Tours, France
| | - Marie-Claire Gubler
- Laboratory of Hereditary Kidney Diseases, Université de Paris, Imagine Institute, INSERM UMR 1163, F-75015, Paris, France
| | - Sophie Saunier
- Laboratory of Hereditary Kidney Diseases, Université de Paris, Imagine Institute, INSERM UMR 1163, F-75015, Paris, France
| | - Laurence Heidet
- Laboratory of Hereditary Kidney Diseases, Université de Paris, Imagine Institute, INSERM UMR 1163, F-75015, Paris, France.
- APHP, Service de Néphrologie pédiatrique, Centre de Référence MARHEA, Hôpital universitaire Necker-Enfants malades, 149 rue de Sèvres, F-75015, Paris, France.
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Stembalska A, Rydzanicz M, Pollak A, Kostrzewa G, Stawinski P, Biela M, Ploski R, Smigiel R. Prenatal Versus Postnatal Diagnosis of Meckel-Gruber and Joubert Syndrome in Patients with TMEM67 Mutations. Genes (Basel) 2021; 12:genes12071078. [PMID: 34356094 PMCID: PMC8304314 DOI: 10.3390/genes12071078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 06/23/2021] [Accepted: 07/08/2021] [Indexed: 11/16/2022] Open
Abstract
Renal cystic diseases are characterized by genetic and phenotypic heterogeneity. Congenital renal cysts can be classified as developmental disorders and are commonly diagnosed prenatally using ultrasonography and magnetic resonance imaging. Progress in molecular diagnostics and availability of exome sequencing procedures allows diagnosis of single-gene disorders in the prenatal period. Two patients with a prenatal diagnosis of polycystic kidney disease are presented in this article. TMEM67 mutations were identified in both fetuses using a whole-exome sequencing (WES) study. In one of them, the phenotypic syndrome diagnosed prenatally was different from that diagnosed in the postnatal period.
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Affiliation(s)
- Agnieszka Stembalska
- Department of Genetics, Wroclaw Medical University, 50-368 Wroclaw, Poland
- Correspondence: (A.S.); (R.S.)
| | - Małgorzata Rydzanicz
- Department of Medical Genetics, Medical University of Warsaw, 02-106 Warsaw, Poland; (M.R.); (A.P.); (G.K.); (P.S.); (R.P.)
| | - Agnieszka Pollak
- Department of Medical Genetics, Medical University of Warsaw, 02-106 Warsaw, Poland; (M.R.); (A.P.); (G.K.); (P.S.); (R.P.)
| | - Grazyna Kostrzewa
- Department of Medical Genetics, Medical University of Warsaw, 02-106 Warsaw, Poland; (M.R.); (A.P.); (G.K.); (P.S.); (R.P.)
| | - Piotr Stawinski
- Department of Medical Genetics, Medical University of Warsaw, 02-106 Warsaw, Poland; (M.R.); (A.P.); (G.K.); (P.S.); (R.P.)
| | - Mateusz Biela
- Department of Paediatrics, Division of Paediatric Propedeutics and Rare Disorders, Wroclaw Medical University, 51-618 Wroclaw, Poland;
| | - Rafal Ploski
- Department of Medical Genetics, Medical University of Warsaw, 02-106 Warsaw, Poland; (M.R.); (A.P.); (G.K.); (P.S.); (R.P.)
| | - Robert Smigiel
- Department of Paediatrics, Division of Paediatric Propedeutics and Rare Disorders, Wroclaw Medical University, 51-618 Wroclaw, Poland;
- Correspondence: (A.S.); (R.S.)
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Zhu P, Qiu Q, Harris PC, Xu X, Lin X. mtor Haploinsufficiency Ameliorates Renal Cysts and Cilia Abnormality in Adult Zebrafish tmem67 Mutants. J Am Soc Nephrol 2021; 32:822-836. [PMID: 33574160 PMCID: PMC8017545 DOI: 10.1681/asn.2020070991] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 12/21/2020] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND Although zebrafish embryos have been used to study ciliogenesis and model polycystic kidney disease (PKD), adult zebrafish remain unexplored. METHODS Transcription activator-like effector nucleases (TALEN) technology was used to generate mutant for tmem67, the homolog of the mammalian causative gene for Meckel syndrome type 3 (MKS3). Classic 2D and optical-clearing 3D imaging of an isolated adult zebrafish kidney were used to examine cystic and ciliary phenotypes. A hypomorphic mtor strain or rapamycin was used to inhibit mTOR activity. RESULTS Adult tmem67 zebrafish developed progressive mesonephric cysts that share conserved features of mammalian cystogenesis, including a switch of cyst origin with age and an increase in proliferation of cyst-lining epithelial cells. The mutants had shorter and fewer distal single cilia and greater numbers of multiciliated cells (MCCs). Absence of a single cilium preceded cystogenesis, and expansion of MCCs occurred after pronephric cyst formation and was inversely correlated with the severity of renal cysts in young adult zebrafish, suggesting a primary defect and an adaptive action, respectively. Finally, the mutants exhibited hyperactive mTOR signaling. mTOR inhibition ameliorated renal cysts in both the embryonic and adult zebrafish models; however, it only rescued ciliary abnormalities in the adult mutants. CONCLUSIONS Adult zebrafish tmem67 mutants offer a new vertebrate model for renal cystic diseases, in which cilia morphology can be analyzed at a single-nephron resolution and mTOR inhibition proves to be a candidate therapeutic strategy.
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Affiliation(s)
- Ping Zhu
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota
| | - Qi Qiu
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota
| | - Peter C. Harris
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota,Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota
| | - Xiaolei Xu
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota,Department of Cardiovascular Medicine, Mayo Clinic, Rochester, Minnesota
| | - Xueying Lin
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota
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George A, Cogliati T, Brooks BP. Genetics of syndromic ocular coloboma: CHARGE and COACH syndromes. Exp Eye Res 2020; 193:107940. [PMID: 32032630 DOI: 10.1016/j.exer.2020.107940] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Revised: 01/20/2020] [Accepted: 01/22/2020] [Indexed: 02/07/2023]
Abstract
Optic fissure closure defects result in uveal coloboma, a potentially blinding condition affecting between 0.5 and 2.6 per 10,000 births that may cause up to 10% of childhood blindness. Uveal coloboma is on a phenotypic continuum with microphthalmia (small eye) and anophthalmia (primordial/no ocular tissue), the so-called MAC spectrum. This review gives a brief overview of the developmental biology behind coloboma and its clinical presentation/spectrum. Special attention will be given to two prominent, syndromic forms of coloboma, namely, CHARGE (Coloboma, Heart defect, Atresia choanae, Retarded growth and development, Genital hypoplasia, and Ear anomalies/deafness) and COACH (Cerebellar vermis hypoplasia, Oligophrenia, Ataxia, Coloboma, and Hepatic fibrosis) syndromes. Approaches employed to identify genes involved in optic fissure closure in animal models and recent advances in live imaging of zebrafish eye development are also discussed.
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Affiliation(s)
- Aman George
- Ophthalmic Genetics and Visual Function Branch, National Eye Institute, National Institutes of Health. Bethesda, Maryland, 20892, USA
| | - Tiziana Cogliati
- Ophthalmic Genetics and Visual Function Branch, National Eye Institute, National Institutes of Health. Bethesda, Maryland, 20892, USA
| | - Brian P Brooks
- Ophthalmic Genetics and Visual Function Branch, National Eye Institute, National Institutes of Health. Bethesda, Maryland, 20892, USA.
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Bui TPH, Nguyen NT, Ngo VD, Nguyen HN, Ly TTH, Do HD, Huynh MT. Novel compound heterozygous TMEM67 variants in a Vietnamese family with Joubert syndrome: a case report. BMC MEDICAL GENETICS 2020; 21:18. [PMID: 32000717 PMCID: PMC6993522 DOI: 10.1186/s12881-020-0962-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 01/24/2020] [Indexed: 11/10/2022]
Abstract
Background Joubert syndrome is a genetically heterogeneous autosomal recessive ciliopathy characterized by the combination of hypoplasia/aplasia of the cerebellar vermis, thickened and elongated superior cerebellar peduncles and a deep interpeduncular fossa, known as “molar tooth sign” associated with hypotonia, respiratory control disturbances and abnormal eye movements. To date, pathogenic variants in over 35 genes are known to cause autosomal recessive Joubert Syndrome, while one gene is associated with X-linked recessive inheritance. Case presentation We describe here a non-consanguineous Vietnamese family with Joubert syndrome, a fetus and 10-year-old developmentally delayed boy. Ultrasonography showed ventriculomegaly at 26 + 6 weeks of gestation in the fetus. The 10-year-old-boy was diagnosed with cerebral palsy of unknown origin. Clinical physical examination at the age of 10, he showed clinical features of Joubert syndrome including typical facial dysmorphism, ataxia, severe psychomotor delay, oculomotor apraxia and molar tooth sign on brain MRI. Whole exome sequencing analysis identified a novel compound heterozygous c.725A > G p.Asn242Ser and c.313-3 T > G p.Lys105Valfs*16 TMEM67 variant in the proband and the affected fetus. These two variants were inherited from each parent and confirmed by Sanger sequencing. The variant c.725A > G p.Asn242Ser was previously documented in patients with JS, the novel splice-site c.313-3 T > G p.Lys105Valfs*16 TMEM67 variant produced an aberrant transcript with the loss of four nucleotides of exon 03. Conclusion This study confirms the diagnosis of Joubert syndrome in a Vietnamese family and expands the mutational spectrum of TMEM67 sequence variations. We also highlight the importance of molecular approaches to unravel underlying mechanisms of human genetic disorders. Early precise diagnosis could help provide further accurate genetic counseling for recurrence-risk assessment, future diagnostic option, management as well as treatment guidance for rare disorders.
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Affiliation(s)
- Thi Phuong Hoa Bui
- Medical Genetics Department, Vinmec Times City International Hospital-Times City, HaNoi, Vietnam
| | - Ngoc Tu Nguyen
- Fetal Medicine Department, Vinmec Times City International Hospital-Times City, HaNoi, Vietnam
| | - Van Doan Ngo
- Diagnostic Imaging Department, Vinmec Times City International Hospital-Times City, HaNoi, Vietnam
| | - Hoai-Nghia Nguyen
- Center for Molecular Medicine, University of Medicine and Pharmacy, Ho Chi Minh city, Vietnam
| | - Thi Thanh Ha Ly
- Medical Genetics Department, Vinmec Times City International Hospital-Times City, HaNoi, Vietnam
| | - Huy Duong Do
- Medical Genetics Department, Vinmec Times City International Hospital-Times City, HaNoi, Vietnam
| | - Minh-Tuan Huynh
- Medical Genetics Department, Vinmec Times City International Hospital-Times City, HaNoi, Vietnam.
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21
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Zhang R, Chen S, Han P, Chen F, Kuang S, Meng Z, Liu J, Sun R, Wang Z, He X, Li Y, Guan Y, Yue Z, Li C, Kumar Dey S, Zhu Y, Banerjee S. Whole exome sequencing identified a homozygous novel variant in CEP290 gene causes Meckel syndrome. J Cell Mol Med 2019; 24:1906-1916. [PMID: 31840411 PMCID: PMC6991682 DOI: 10.1111/jcmm.14887] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 11/15/2019] [Accepted: 11/22/2019] [Indexed: 12/01/2022] Open
Abstract
Meckel syndrome (MKS) is a pre‐ or perinatal multisystemic ciliopathic lethal disorder with an autosomal recessive mode of inheritance. Meckel syndrome is usually manifested with meningo‐occipital encephalocele, polycystic kidney dysplasia, postaxial polydactyly and hepatobiliary ductal plate malformation. Germline variants in CEP290 cause MKS4. In this study, we investigated a 35‐years‐old Chinese female who was 17+1 weeks pregnant. She had a history of adverse pregnancy of having foetus with multiple malformations. We performed ultrasonography and identified the foetus with occipital meningoencephalocele and enlarged cystic dysplastic kidneys. So, she decided to terminate her pregnancy and further genetic molecular analysis was performed. We identified the aborted foetus without postaxial polydactyly. Histological examination of foetal kidney showed cysts in kidney and thinning of the renal cortex with glomerular atrophy. Whole exome sequencing identified a novel homozygous variant (c.2144T>G; p.L715*) in exon 21 of the CEP290 in the foetus. Sanger sequencing confirmed that both the parents of the foetus were carrying this variant in a heterozygous state. This variant was not identified in two elder sisters of the foetus as well as in the 100 healthy individuals. Western blot analysis showed that this variant leads to the formation of truncated CEP290 protein with the molecular weight of 84 KD compared with the wild‐type CEP290 protein of 290 KD. Hence, it is a loss‐of‐function variant. We also found that the mutant cilium appears longer in length than the wild‐type cilium. Our present study reported the first variant of CEP290 associated with MKS4 in Chinese population.
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Affiliation(s)
- Rui Zhang
- Division of Maternal-Fetal Medicine, Bao'an Women and Children's Hospital, Jinan University, Shenzhen, China
| | - Shaoyun Chen
- Division of Maternal-Fetal Medicine, Bao'an Women and Children's Hospital, Jinan University, Shenzhen, China
| | - Peng Han
- BGI-Qingdao, BGI-Shenzhen, Qingdao, China.,China National GeneBank, BGI-Shenzhen, Shenzhen, China
| | - Fangfang Chen
- Department of Pathology, Bao'an Maternity and Child Health Hospital, Shenzhen, China
| | - Shan Kuang
- BGI-Qingdao, BGI-Shenzhen, Qingdao, China.,China National GeneBank, BGI-Shenzhen, Shenzhen, China
| | - Zhuo Meng
- Division of Maternal-Fetal Medicine, Bao'an Women and Children's Hospital, Jinan University, Shenzhen, China
| | - Junnian Liu
- BGI-Qingdao, BGI-Shenzhen, Qingdao, China.,China National GeneBank, BGI-Shenzhen, Shenzhen, China.,BGI-Shenzhen, Beishan Industrial Zone, Shenzhen, China
| | - Ruliang Sun
- Department of Pathology, Bao'an Maternity and Child Health Hospital, Shenzhen, China
| | - Zhiwei Wang
- BGI-Qingdao, BGI-Shenzhen, Qingdao, China.,China National GeneBank, BGI-Shenzhen, Shenzhen, China
| | - Xiaohong He
- Division of Maternal-Fetal Medicine, Bao'an Women and Children's Hospital, Jinan University, Shenzhen, China
| | - Yong Li
- BGI-Qingdao, BGI-Shenzhen, Qingdao, China.,China National GeneBank, BGI-Shenzhen, Shenzhen, China
| | - Yuanning Guan
- BGI-Qingdao, BGI-Shenzhen, Qingdao, China.,China National GeneBank, BGI-Shenzhen, Shenzhen, China
| | | | - Chen Li
- Department of Cell Biology and Medical Genetics, School of Medicine, Zhejiang University, Hangzhou, China
| | - Subrata Kumar Dey
- Department of Biotechnology, Centre for Genetic Studies, School of Biotechnology and Biological Sciences, Maulana Abul Kalam Azad University of Technology (Formerly West Bengal University of Technology), Kolkata, India.,Brainware University, Barasat, India
| | - Yuanfang Zhu
- Division of Maternal-Fetal Medicine, Bao'an Women and Children's Hospital, Jinan University, Shenzhen, China
| | - Santasree Banerjee
- BGI-Qingdao, BGI-Shenzhen, Qingdao, China.,China National GeneBank, BGI-Shenzhen, Shenzhen, China.,BGI-Shenzhen, Beishan Industrial Zone, Shenzhen, China.,Brainware University, Barasat, India
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22
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Ott T, Kaufmann L, Granzow M, Hinderhofer K, Bartram CR, Theiß S, Seitz A, Paramasivam N, Schulz A, Moog U, Blum M, Evers CM. The Frog Xenopus as a Model to Study Joubert Syndrome: The Case of a Human Patient With Compound Heterozygous Variants in PIBF1. Front Physiol 2019; 10:134. [PMID: 30858804 PMCID: PMC6397843 DOI: 10.3389/fphys.2019.00134] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Accepted: 02/04/2019] [Indexed: 12/16/2022] Open
Abstract
Joubert syndrome (JS) is a congenital autosomal-recessive or—in rare cases–X-linked inherited disease. The diagnostic hallmark of the so-called molar tooth sign describes the morphological manifestation of the mid- and hind-brain in axial brain scans. Affected individuals show delayed development, intellectual disability, ataxia, hyperpnea, sleep apnea, abnormal eye, and tongue movements as well as hypotonia. At the cellular level, JS is associated with the compromised biogenesis of sensory cilia, which identifies JS as a member of the large group of ciliopathies. Here we report on the identification of novel compound heterozygous variants (p.Y503C and p.Q485*) in the centrosomal gene PIBF1 in a patient with JS via trio whole exome sequencing. We have studied the underlying disease mechanism in the frog Xenopus, which offers fast assessment of cilia functions in a number of embryological contexts. Morpholino oligomer (MO) mediated knockdown of the orthologous Xenopus pibf1 gene resulted in defective mucociliary clearance in the larval epidermis, due to reduced cilia numbers and motility on multiciliated cells. To functionally assess patient alleles, mutations were analyzed in the larval skin: the p.Q485* nonsense mutation resulted in a disturbed localization of PIBF1 to the ciliary base. This mutant failed to rescue the ciliation phenotype following knockdown of endogenous pibf1. In contrast, the missense variant p.Y503C resulted in attenuated rescue capacity compared to the wild type allele. Based on these results, we conclude that in the case of this patient, JS is the result of a pathogenic combination of an amorphic and a hypomorphic PIBF1 allele. Our study underscores the versatility of the Xenopus model to study ciliopathies such as JS in a rapid and cost-effective manner, which should render this animal model attractive for future studies of human ciliopathies.
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Affiliation(s)
- Tim Ott
- Institute of Zoology, University of Hohenheim, Stuttgart, Germany
| | - Lilian Kaufmann
- Institute of Human Genetics, Heidelberg University, Heidelberg, Germany
| | - Martin Granzow
- Institute of Human Genetics, Heidelberg University, Heidelberg, Germany
| | | | - Claus R Bartram
- Institute of Human Genetics, Heidelberg University, Heidelberg, Germany
| | - Susanne Theiß
- Institute of Human Genetics, Heidelberg University, Heidelberg, Germany
| | - Angelika Seitz
- Department of Neuroradiology, University Hospital Heidelberg, Heidelberg, Germany
| | - Nagarajan Paramasivam
- Medical Faculty Heidelberg, Heidelberg University, Heidelberg, Germany.,Division of Theoretical Bioinformatics, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Angela Schulz
- Genomics & Proteomics Core Facility, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Ute Moog
- Institute of Human Genetics, Heidelberg University, Heidelberg, Germany
| | - Martin Blum
- Institute of Zoology, University of Hohenheim, Stuttgart, Germany
| | - Christina M Evers
- Institute of Human Genetics, Heidelberg University, Heidelberg, Germany
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23
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Review of Ocular Manifestations of Joubert Syndrome. Genes (Basel) 2018; 9:genes9120605. [PMID: 30518138 PMCID: PMC6315342 DOI: 10.3390/genes9120605] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 11/13/2018] [Accepted: 11/27/2018] [Indexed: 12/13/2022] Open
Abstract
Joubert syndrome is a group of rare disorders that stem from defects in a sensory organelle, the primary cilia. Affected patients often present with disorders involving multiple organ systems, including the brain, eyes, and kidneys. Common symptoms include breathing abnormalities, mental developmental delays, loss of voluntary muscle coordination, and abnormal eye movements, with a diagnostic “molar tooth” sign observed by magnetic resonance imaging (MRI) of the midbrain. We reviewed the ocular phenotypes that can be found in patients with Joubert syndrome. Ocular motor apraxia is the most frequent (80% of patients), followed by strabismus (74%) and nystagmus (72%). A minority of patients also present with ptosis (43%), chorioretinal coloboma (30%), and optic nerve atrophy (22%). Although mutations in 34 genes have been found to be associated with Joubert syndrome, retinal degeneration has been reported in only 38% of patients. Mutations in AHI1 and CEP290, genes critical to primary cilia function, have been linked to retinal degeneration. In conclusion, Joubert syndrome is a rare pleiotropic group of disorders with variable ocular presentations.
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24
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Huynh JM, Galindo M, Laukaitis CM. Missense variants in TMEM67 in a patient with Joubert syndrome. Clin Case Rep 2018; 6:2189-2192. [PMID: 30455918 PMCID: PMC6230611 DOI: 10.1002/ccr3.1748] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 06/30/2018] [Accepted: 07/08/2018] [Indexed: 11/11/2022] Open
Abstract
We present a patient with a clinical diagnosis of Joubert syndrome with COACH phenotype who carries two TMEM67 variants of uncertain significance (VUS). One VUS can be reclassified as "likely pathogenic" by adding clinical data. As genetic testing becomes more accessible, more VUS will require clinical correlation for accurate classification.
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Affiliation(s)
| | | | - Christina M. Laukaitis
- Department of MedicineCenter for Applied Genetics and GenomicsCollege of MedicineUniversity of Arizona Cancer CenterUniversity of ArizonaTucsonArizona
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25
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Brancati F, Camerota L, Colao E, Vega-Warner V, Zhao X, Zhang R, Bottillo I, Castori M, Caglioti A, Sangiuolo F, Novelli G, Perrotti N, Otto EA. Biallelic variants in the ciliary gene TMEM67 cause RHYNS syndrome. Eur J Hum Genet 2018; 26:1266-1271. [PMID: 29891882 DOI: 10.1038/s41431-018-0183-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2017] [Revised: 04/27/2018] [Accepted: 05/08/2018] [Indexed: 11/09/2022] Open
Abstract
A rare syndrome was first described in 1997 in a 17-year-old male patient presenting with Retinitis pigmentosa, HYpopituitarism, Nephronophthisis and Skeletal dysplasia (RHYNS). In the single reported familial case, two brothers were affected, arguing for X-linked or recessive mode of inheritance. Up to now, the underlying genetic basis of RHYNS syndrome remains unknown. Here we applied whole-exome sequencing in the originally described family with RHYNS to identify compound heterozygous variants in the ciliary gene TMEM67. Sanger sequencing confirmed a paternally inherited nonsense c.622A > T, p.(Arg208*) and a maternally inherited missense variant c.1289A > G, p.(Asp430Gly), which perturbs the correct splicing of exon 13. Overall, TMEM67 showed one of the widest clinical continuum observed in ciliopathies ranging from early lethality to adults with liver fibrosis. Our findings extend the spectrum of phenotypes/syndromes resulting from biallelic TMEM67 variants to now eight distinguishable clinical conditions including RHYNS syndrome.
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Affiliation(s)
- Francesco Brancati
- Department of Life, Health and Environmental Sciences, University of L'Aquila, L'Aquila, Italy. .,Laboratory of Molecular and Cell Biology, Istituto Dermopatico dell'Immacolata (IDI) IRCCS, Rome, Italy.
| | - Letizia Camerota
- Laboratory of Molecular and Cell Biology, Istituto Dermopatico dell'Immacolata (IDI) IRCCS, Rome, Italy
| | - Emma Colao
- Medical Genetics Unit, Mater Domini University Hospital, Catanzaro, Italy
| | - Virginia Vega-Warner
- Division of Nephrology, Department of Pediatrics and Communicable Diseases, University of Michigan School of Medicine, Ann Arbor, Michigan, USA
| | - Xiangzhong Zhao
- Central Laboratory, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Ruixiao Zhang
- Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Irene Bottillo
- Division of Medical Genetics, Department of Molecular Medicine, Sapienza University, San Camillo-Forlanini Hospital, Rome, Italy
| | - Marco Castori
- Division of Medical Genetics, IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Foggia, Italy
| | - Alfredo Caglioti
- Nephrology and Dialysis Unit, Mater Domini University Hospital, Catanzaro, Italy
| | - Federica Sangiuolo
- Department of Biomedicine and Prevention, University of Rome Tor Vergata, Rome, Italy
| | - Giuseppe Novelli
- Department of Biomedicine and Prevention, University of Rome Tor Vergata, Rome, Italy
| | - Nicola Perrotti
- Department of Health Sciences, University of Catanzaro Magna Graecia, Catanzaro, Italy
| | - Edgar A Otto
- Division of Nephrology, Department of Internal Medicine, University of Michigan School of Medicine, Ann Arbor, Michigan, USA
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26
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Phelps IG, Dempsey JC, Grout ME, Isabella CR, Tully HM, Doherty D, Bachmann-Gagescu R. Interpreting the clinical significance of combined variants in multiple recessive disease genes: systematic investigation of Joubert syndrome yields little support for oligogenicity. Genet Med 2018; 20:223-233. [PMID: 28771248 PMCID: PMC5797514 DOI: 10.1038/gim.2017.94] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Accepted: 05/19/2017] [Indexed: 01/11/2023] Open
Abstract
PurposeNext-generation sequencing (NGS) often identifies multiple rare predicted-deleterious variants (RDVs) in different genes associated with a recessive disorder in a given patient. Such variants have been proposed to contribute to digenicity/oligogenicity or "triallelism" or to act as genetic modifiers.MethodsUsing the recessive ciliopathy Joubert syndrome (JBTS) as a model, we investigated these possibilities systematically, relying on NGS of known JBTS genes in a large JBTS and two control cohorts.Results65% of affected individuals had a recessive genetic cause, while 4.9% were candidates for di-/oligogenicity, harboring heterozygous RDVs in two or more genes, compared with 4.2-8% in controls (P = 0.66-0.21). Based on Exome Aggregation Consortium (ExAC) allele frequencies, the probability of cumulating RDVs in any two JBTS genes is 9.3%. We found no support for triallelism, as no unaffected siblings carried the same biallelic RDVs as their affected relative. Sixty percent of individuals sharing identical causal RDVs displayed phenotypic discordance. Although 38% of affected individuals harbored RDVs in addition to the causal mutations, their presence did not correlate with phenotypic severity.ConclusionOur data offer little support for triallelism or digenicity/oligogenicity as clinically relevant inheritance modes in JBTS. While phenotypic discordance supports the existence of genetic modifiers, identifying clinically relevant modifiers remains challenging.
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Affiliation(s)
- Ian G. Phelps
- Department of Pediatrics, University of Washington, Seattle, WA, USA
| | | | - Megan E. Grout
- Department of Pediatrics, University of Washington, Seattle, WA, USA
| | | | - Hannah M. Tully
- Department of Neurology, University of Washington, Seattle, Washington
- Center for Integrative Brain Research, Seattle Children’s Research Institute, Seattle, Washington
| | - Dan Doherty
- Department of Pediatrics, University of Washington, Seattle, WA, USA
- Center for Integrative Brain Research, Seattle Children’s Research Institute, Seattle, Washington
| | - Ruxandra Bachmann-Gagescu
- Institute of Medical Genetics, University of Zurich, Switzerland
- Institute of Molecular Life Sciences, University of Zurich, Switzerland
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27
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Arrigoni F, Romaniello R, Peruzzo D, De Luca A, Parazzini C, Valente EM, Borgatti R, Triulzi F. Anterior Mesencephalic Cap Dysplasia: Novel Brain Stem Malformative Features Associated with Joubert Syndrome. AJNR Am J Neuroradiol 2017; 38:2385-2390. [PMID: 28838911 DOI: 10.3174/ajnr.a5360] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Accepted: 06/30/2017] [Indexed: 11/07/2022]
Abstract
In Joubert syndrome, the "molar tooth" sign can be associated with several additional supra- and infratentorial malformations. Here we report on 3 subjects (2 siblings, 8-14 years of age) with Joubert syndrome, showing an abnormal thick bulging of the anterior profile of the mesencephalon causing a complete obliteration of the interpeduncular fossa. DTI revealed that the abnormal tissue consisted of an ectopic white matter tract with a laterolateral transverse orientation. Tractographic reconstructions support the hypothesis of impaired axonal guidance mechanisms responsible for the malformation. The 2 siblings were compound heterozygous for 2 missense variants in the TMEM67 gene, while no mutations in a panel of 120 ciliary genes were detected in the third patient. The name "anterior mesencephalic cap dysplasia," referring to the peculiar aspect of the mesencephalon on sagittal MR imaging, is proposed for this new malformative feature.
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Affiliation(s)
- F Arrigoni
- From the Neuroimaging Lab (F.A., D.P., A.D.L.)
| | - R Romaniello
- Neuropsychiatry and Neurorehabilitation Unit (R.R., R.B.), Scientific Institute Istituto Di Ricovero e Cura a Carattere Scientific Eugenio Medea, Bosisio Parini, Italy
| | - D Peruzzo
- From the Neuroimaging Lab (F.A., D.P., A.D.L.)
| | - A De Luca
- From the Neuroimaging Lab (F.A., D.P., A.D.L.)
- Department of Information Engineering (A.D.L.), University of Padova, Padova, Italy
| | - C Parazzini
- Department of Pediatric Radiology and Neuroradiology (C.P.), "V. Buzzi" Children's Hospital, Milan, Italy
| | - E M Valente
- Department of Molecular Medicine (E.M.V.), University of Pavia, Pavia, Italy
- Neurogenetics Unit (E.M.V.), Istituto Di Ricovero e Cura a Carattere Scientific Santa Lucia Foundation, Rome, Italy
| | - R Borgatti
- Neuropsychiatry and Neurorehabilitation Unit (R.R., R.B.), Scientific Institute Istituto Di Ricovero e Cura a Carattere Scientific Eugenio Medea, Bosisio Parini, Italy
| | - F Triulzi
- Department of Neuroradiology (F.T.), Scientific Institute Istituto Di Ricovero e Cura a Carattere Scientific Cà Granda Foundation-Ospedale Maggiore Policlinico, Milan, Italy
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28
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Bruechle NO, Steuernagel P, Zerres K, Kurth I, Eggermann T, Knopp C. Uniparental disomy as an unexpected cause of Meckel-Gruber syndrome: report of a case. Pediatr Nephrol 2017. [PMID: 28620746 DOI: 10.1007/s00467-017-3710-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND Meckel-Gruber syndrome (MKS, OMIM #607361) is a rare pre- or perinatal lethal autosomal recessive ciliopathy caused by mutations in at least 12 known genes. It has a clinical and genetic overlap with other viable ciliopathies, especially Joubert syndrome and Joubert syndrome-related disorders. MKS is characterized by multicystic kidney dysplasia, central nervous system malformations (usually occipital encephalocele), ductal plate malformation of the liver, and postaxial polydactyly. CASE DIAGNOSIS We identified a homozygous mutation in TMEM67 (MKS3) in a fetus affected by MKS; however, only the mother was a carrier of the respective mutation. Genotyping with polymorphic microsatellite markers and single nucleotide polymorphism (SNP) array revealed a maternal uniparental disomy (UPD) of the entire chromosome 8 (upd(8)mat), harboring TMEM67. CONCLUSIONS This is the first reported case of UPD as a cause of MKS. The possible underlying mechanisms for uniparental disomy (UPD) are reviewed. Even if rare, awareness of UPD and comprehensive work-up in the case of unexpected homozygosity for a recessive mutation is essential for accurate genetic counseling and assessment of the risk of recurrence.
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Affiliation(s)
- Nadia Ortiz Bruechle
- Institute of Human Genetics, Medical Faculty, RWTH Aachen University, Pauwelsstraße 30, 52074, Aachen, Germany.,Institute of Pathology, Medical Faculty, RWTH Aachen University, Pauwelsstraße 30, 52074, Aachen, Germany
| | - Peter Steuernagel
- Institute of Human Genetics, Hospital Oldenburg, Rahel-Straus-Straße 10, 26133, Oldenburg, Germany
| | - Klaus Zerres
- Institute of Human Genetics, Medical Faculty, RWTH Aachen University, Pauwelsstraße 30, 52074, Aachen, Germany
| | - Ingo Kurth
- Institute of Human Genetics, Medical Faculty, RWTH Aachen University, Pauwelsstraße 30, 52074, Aachen, Germany
| | - Thomas Eggermann
- Institute of Human Genetics, Medical Faculty, RWTH Aachen University, Pauwelsstraße 30, 52074, Aachen, Germany
| | - Cordula Knopp
- Institute of Human Genetics, Medical Faculty, RWTH Aachen University, Pauwelsstraße 30, 52074, Aachen, Germany.
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29
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Vogel I, Ott P, Lildballe D, Hamilton-Dutoit S, Vilstrup H, Grønbæk H. Isolated congenital hepatic fibrosis associated with TMEM67 mutations: report of a new genotype-phenotype relationship. Clin Case Rep 2017; 5:1098-1102. [PMID: 28680603 PMCID: PMC5494401 DOI: 10.1002/ccr3.981] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Revised: 02/28/2017] [Accepted: 03/22/2017] [Indexed: 11/18/2022] Open
Abstract
We report an otherwise healthy 32‐year‐old man with portal hypertension, variceal bleeding, and congenital hepatic fibrosis with ductal plate malformation. Genetic screening identified two TMEM67 mutations. Biallelic TMEM67 mutations are known to cause Joubert/Meckel syndrome or nephronopthisis with hepatic fibrosis, but have never been found in isolated hepatic fibrosis.
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Affiliation(s)
- Ida Vogel
- Department of Clinical Genetics Aarhus University Hospital Aarhus Denmark
| | - Peter Ott
- Department of Hepatology and Gastroenterology V Aarhus University Hospital Aarhus Denmark
| | - Dorte Lildballe
- Department of Clinical Genetics Aarhus University Hospital Aarhus Denmark
| | | | - Hendrik Vilstrup
- Department of Hepatology and Gastroenterology V Aarhus University Hospital Aarhus Denmark
| | - Henning Grønbæk
- Department of Hepatology and Gastroenterology V Aarhus University Hospital Aarhus Denmark
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30
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Stayner C, Poole CA, McGlashan SR, Pilanthananond M, Brauning R, Markie D, Lett B, Slobbe L, Chae A, Johnstone AC, Jensen CG, McEwan JC, Dittmer K, Parker K, Wiles A, Blackburne W, Leichter A, Leask M, Pinnapureddy A, Jennings M, Horsfield JA, Walker RJ, Eccles MR. An ovine hepatorenal fibrocystic model of a Meckel-like syndrome associated with dysmorphic primary cilia and TMEM67 mutations. Sci Rep 2017; 7:1601. [PMID: 28487520 PMCID: PMC5431643 DOI: 10.1038/s41598-017-01519-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 03/29/2017] [Indexed: 01/20/2023] Open
Abstract
Meckel syndrome (MKS) is an inherited autosomal recessive hepatorenal fibrocystic syndrome, caused by mutations in TMEM67, characterized by occipital encephalocoele, renal cysts, hepatic fibrosis, and polydactyly. Here we describe an ovine model of MKS, with kidney and liver abnormalities, without polydactyly or occipital encephalocoele. Homozygous missense p.(Ile681Asn; Ile687Ser) mutations identified in ovine TMEM67 were pathogenic in zebrafish phenotype rescue assays. Meckelin protein was expressed in affected and unaffected kidney epithelial cells by immunoblotting, and in primary cilia of lamb kidney cyst epithelial cells by immunofluorescence. In contrast to primary cilia of relatively consistent length and morphology in unaffected kidney cells, those of affected cyst-lining cells displayed a range of short and extremely long cilia, as well as abnormal morphologies, such as bulbous regions along the axoneme. Putative cilia fragments were also consistently located within the cyst luminal contents. The abnormal ciliary phenotype was further confirmed in cultured interstitial fibroblasts from affected kidneys. These primary cilia dysmorphologies and length control defects were significantly greater in affected cells compared to unaffected controls. In conclusion, we describe abnormalities involving primary cilia length and morphology in the first reported example of a large animal model of MKS, in which we have identified TMEM67 mutations.
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Affiliation(s)
- C Stayner
- Department of Pathology, Dunedin School of Medicine, University of Otago, PO Box 56, Dunedin 9054, New Zealand
| | - C A Poole
- Department of Medicine, Dunedin School of Medicine, University of Otago, PO Box 56, Dunedin 9054, New Zealand.,150 Warren Street, Wanaka, 9305, New Zealand
| | - S R McGlashan
- Department of Anatomy and Medical Imaging, The University of Auckland 1142, Private Bag, 92019, Auckland, New Zealand
| | - M Pilanthananond
- Department of Pathology, Dunedin School of Medicine, University of Otago, PO Box 56, Dunedin 9054, New Zealand
| | - R Brauning
- AgResearch Invermay Agricultural Centre, Mosgiel, 9053, New Zealand
| | - D Markie
- Department of Pathology, Dunedin School of Medicine, University of Otago, PO Box 56, Dunedin 9054, New Zealand
| | - B Lett
- Department of Pathology, Dunedin School of Medicine, University of Otago, PO Box 56, Dunedin 9054, New Zealand
| | - L Slobbe
- Department of Pathology, Dunedin School of Medicine, University of Otago, PO Box 56, Dunedin 9054, New Zealand
| | - A Chae
- Department of Pathology, Dunedin School of Medicine, University of Otago, PO Box 56, Dunedin 9054, New Zealand
| | - A C Johnstone
- Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Tennant Drive, Palmerston North, 4472, New Zealand
| | - C G Jensen
- Department of Anatomy and Medical Imaging, The University of Auckland 1142, Private Bag, 92019, Auckland, New Zealand
| | - J C McEwan
- AgResearch Invermay Agricultural Centre, Mosgiel, 9053, New Zealand
| | - K Dittmer
- Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Tennant Drive, Palmerston North, 4472, New Zealand
| | - K Parker
- Department of Medicine, Dunedin School of Medicine, University of Otago, PO Box 56, Dunedin 9054, New Zealand
| | - A Wiles
- Department of Pathology, Dunedin School of Medicine, University of Otago, PO Box 56, Dunedin 9054, New Zealand
| | - W Blackburne
- Department of Pathology, Dunedin School of Medicine, University of Otago, PO Box 56, Dunedin 9054, New Zealand
| | - A Leichter
- Department of Pathology, Dunedin School of Medicine, University of Otago, PO Box 56, Dunedin 9054, New Zealand
| | - M Leask
- Department of Pathology, Dunedin School of Medicine, University of Otago, PO Box 56, Dunedin 9054, New Zealand
| | - A Pinnapureddy
- Department of Pathology, Dunedin School of Medicine, University of Otago, PO Box 56, Dunedin 9054, New Zealand
| | - M Jennings
- Department of Medicine, Dunedin School of Medicine, University of Otago, PO Box 56, Dunedin 9054, New Zealand
| | - J A Horsfield
- Department of Pathology, Dunedin School of Medicine, University of Otago, PO Box 56, Dunedin 9054, New Zealand
| | - R J Walker
- Department of Medicine, Dunedin School of Medicine, University of Otago, PO Box 56, Dunedin 9054, New Zealand
| | - M R Eccles
- Department of Pathology, Dunedin School of Medicine, University of Otago, PO Box 56, Dunedin 9054, New Zealand.
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Garcia-Gonzalo FR, Reiter JF. Open Sesame: How Transition Fibers and the Transition Zone Control Ciliary Composition. Cold Spring Harb Perspect Biol 2017; 9:cshperspect.a028134. [PMID: 27770015 DOI: 10.1101/cshperspect.a028134] [Citation(s) in RCA: 166] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Cilia are plasma membrane protrusions that act as cellular propellers or antennae. To perform these functions, cilia must maintain a composition distinct from those of the contiguous cytosol and plasma membrane. The specialized composition of the cilium depends on the ciliary gate, the region at the ciliary base separating the cilium from the rest of the cell. The ciliary gate's main structural features are electron dense struts connecting microtubules to the adjacent membrane. These structures include the transition fibers, which connect the distal basal body to the base of the ciliary membrane, and the Y-links, which connect the proximal axoneme and ciliary membrane within the transition zone. Both transition fibers and Y-links form early during ciliogenesis and play key roles in ciliary assembly and trafficking. Accordingly, many human ciliopathies are caused by mutations that perturb ciliary gate function.
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Affiliation(s)
- Francesc R Garcia-Gonzalo
- Departamento de Bioquímica, Facultad de Medicina, and Instituto de Investigaciones Biomédicas Alberto Sols UAM-CSIC, Universidad Autónoma de Madrid, 28029 Madrid, Spain
| | - Jeremy F Reiter
- Department of Biochemistry and Biophysics, and Cardiovascular Research Institute, University of California, San Francisco, San Francisco, California 94158
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Srivastava S, Molinari E, Raman S, Sayer JA. Many Genes-One Disease? Genetics of Nephronophthisis (NPHP) and NPHP-Associated Disorders. Front Pediatr 2017; 5:287. [PMID: 29379777 PMCID: PMC5770800 DOI: 10.3389/fped.2017.00287] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Accepted: 12/14/2017] [Indexed: 12/13/2022] Open
Abstract
Nephronophthisis (NPHP) is a renal ciliopathy and an autosomal recessive cause of cystic kidney disease, renal fibrosis, and end-stage renal failure, affecting children and young adults. Molecular genetic studies have identified more than 20 genes underlying this disorder, whose protein products are all related to cilia, centrosome, or mitotic spindle function. In around 15% of cases, there are additional features of a ciliopathy syndrome, including retinal defects, liver fibrosis, skeletal abnormalities, and brain developmental disorders. Alongside, gene identification has arisen molecular mechanistic insights into the disease pathogenesis. The genetic causes of NPHP are discussed in terms of how they help us to define treatable disease pathways including the cyclic adenosine monophosphate pathway, the mTOR pathway, Hedgehog signaling pathways, and DNA damage response pathways. While the underlying pathology of the many types of NPHP remains similar, the defined disease mechanisms are diverse, and a personalized medicine approach for therapy in NPHP patients is likely to be required.
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Affiliation(s)
- Shalabh Srivastava
- Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom.,Renal Unit, City Hospitals Sunderland and South Tyneside NHS Foundation Trust, Sunderland, United Kingdom
| | - Elisa Molinari
- Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Shreya Raman
- Department of Histopathology, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, United Kingdom
| | - John A Sayer
- Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom.,Renal Services, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, United Kingdom
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33
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Hartill V, Szymanska K, Sharif SM, Wheway G, Johnson CA. Meckel-Gruber Syndrome: An Update on Diagnosis, Clinical Management, and Research Advances. Front Pediatr 2017; 5:244. [PMID: 29209597 PMCID: PMC5701918 DOI: 10.3389/fped.2017.00244] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 11/02/2017] [Indexed: 11/13/2022] Open
Abstract
Meckel-Gruber syndrome (MKS) is a lethal autosomal recessive congenital anomaly syndrome caused by mutations in genes encoding proteins that are structural or functional components of the primary cilium. Conditions that are caused by mutations in ciliary genes are collectively termed the ciliopathies, and MKS represents the most severe condition in this group of disorders. The primary cilium is a microtubule-based organelle, projecting from the apical surface of vertebrate cells. It acts as an "antenna" that receives and transduces chemosensory and mechanosensory signals, but also regulates diverse signaling pathways, such as Wnt and Shh, that have important roles during embryonic development. Most MKS proteins localize to a distinct ciliary compartment called the transition zone (TZ) that regulates the trafficking of cargo proteins or lipids. In this review, we provide an up-to-date summary of MKS clinical features, molecular genetics, and clinical diagnosis. MKS has a highly variable phenotype, extreme genetic heterogeneity, and displays allelism with other related ciliopathies such as Joubert syndrome, presenting significant challenges to diagnosis. Recent advances in genetic technology, with the widespread use of multi-gene panels for molecular testing, have significantly improved diagnosis, genetic counseling, and the clinical management of MKS families. These include the description of some limited genotype-phenotype correlations. We discuss recent insights into the molecular basis of disease in MKS, since the functions of some of the relevant ciliary proteins have now been determined. A common molecular etiology appears to be disruption of ciliary TZ structure and function, affecting essential developmental signaling and the regulation of secondary messengers.
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Affiliation(s)
- Verity Hartill
- Department of Clinical Genetics, Yorkshire Regional Genetics Service, Leeds Teaching Hospitals NHS Trust, Leeds, United Kingdom.,Leeds Institute of Biomedical and Clinical Sciences, University of Leeds, Leeds, United Kingdom
| | - Katarzyna Szymanska
- Leeds Institute of Biomedical and Clinical Sciences, University of Leeds, Leeds, United Kingdom
| | - Saghira Malik Sharif
- Department of Clinical Genetics, Yorkshire Regional Genetics Service, Leeds Teaching Hospitals NHS Trust, Leeds, United Kingdom
| | - Gabrielle Wheway
- Faculty of Health and Applied Sciences, Department of Applied Sciences, UWE Bristol, Bristol, United Kingdom
| | - Colin A Johnson
- Leeds Institute of Biomedical and Clinical Sciences, University of Leeds, Leeds, United Kingdom
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34
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Roosing S, Romani M, Isrie M, Rosti RO, Micalizzi A, Musaev D, Mazza T, Al-gazali L, Altunoglu U, Boltshauser E, D'Arrigo S, De Keersmaecker B, Kayserili H, Brandenberger S, Kraoua I, Mark PR, McKanna T, Van Keirsbilck J, Moerman P, Poretti A, Puri R, Van Esch H, Gleeson JG, Valente EM. Mutations in CEP120 cause Joubert syndrome as well as complex ciliopathy phenotypes. J Med Genet 2016; 53:608-15. [PMID: 27208211 PMCID: PMC5013089 DOI: 10.1136/jmedgenet-2016-103832] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 03/16/2016] [Accepted: 04/02/2016] [Indexed: 12/17/2022]
Abstract
BACKGROUND Ciliopathies are an extensive group of autosomal recessive or X-linked disorders with considerable genetic and clinical overlap, which collectively share multiple organ involvement and may result in lethal or viable phenotypes. In large numbers of cases the genetic defect remains yet to be determined. The aim of this study is to describe the mutational frequency and phenotypic spectrum of the CEP120 gene. METHODS Exome sequencing was performed in 145 patients with Joubert syndrome (JS), including 15 children with oral-facial-digital syndrome type VI (OFDVI) and 21 Meckel syndrome (MKS) fetuses. Moreover, exome sequencing was performed in one fetus with tectocerebellar dysraphia with occipital encephalocele (TCDOE), molar tooth sign and additional skeletal abnormalities. As a parallel study, 346 probands with a phenotype consistent with JS or related ciliopathies underwent next-generation sequencing-based targeted sequencing of 120 previously described and candidate ciliopathy genes. RESULTS We present six probands carrying nine distinct mutations (of which eight are novel) in the CEP120 gene, previously found mutated only in Jeune asphyxiating thoracic dystrophy (JATD). The CEP120-associated phenotype ranges from mild classical JS in four patients to more severe conditions in two fetuses, with overlapping features of distinct ciliopathies that include TCDOE, MKS, JATD and OFD syndromes. No obvious correlation is evident between the type or location of identified mutations and the ciliopathy phenotype. CONCLUSION Our findings broaden the spectrum of phenotypes caused by CEP120 mutations that account for nearly 1% of patients with JS as well as for more complex ciliopathy phenotypes. The lack of clear genotype-phenotype correlation highlights the relevance of comprehensive genetic analyses in the diagnostics of ciliopathies.
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Affiliation(s)
- Susanne Roosing
- Laboratory for Pediatric Brain Disease, New York Genome Center, Howard Hughes Medical Institute, The Rockefeller University, New York, New York, USA
| | - Marta Romani
- IRCCS Casa Sollievo della Sofferenza, Mendel Institute, San Giovanni Rotondo, Italy
| | - Mala Isrie
- Department of Human Genetics, Laboratory for the Genetics of Cognition, Center for Human Genetics, KU Leuven, Belgium
| | - Rasim Ozgur Rosti
- Department of Neurosciences, University of California San Diego (UCSD), La Jolla, California, USA
| | - Alessia Micalizzi
- IRCCS Casa Sollievo della Sofferenza, Mendel Institute, San Giovanni Rotondo, Italy
- Department of Biological and Environmental Science, University of Messina, Messina, Italy
| | - Damir Musaev
- Department of Neurosciences, University of California San Diego (UCSD), La Jolla, California, USA
| | - Tommaso Mazza
- IRCCS Casa Sollievo della Sofferenza, Mendel Institute, San Giovanni Rotondo, Italy
| | - Lihadh Al-gazali
- Department of Pediatrics, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, Abu Dhabi, United Arab Emirates
| | - Umut Altunoglu
- Medical Genetics Department, İstanbul Medical Faculty, İstanbul University, İstanbul, Turkey
| | - Eugen Boltshauser
- Division of Pediatric Neurology, University Children's Hospital, Zurich, Switzerland
| | - Stefano D'Arrigo
- Developmental Neurology Division, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Bart De Keersmaecker
- Department of Obstetrics and Gynecology, University Hospitals Leuven, Leuven, Belgium
- Department of Obstetrics and Gynecology, AZ Groeninge, Kortrijk, Belgium
| | - Hülya Kayserili
- Medical Genetics Department, Koç University School of Medicine (KUSOM), Istanbul, Turkey
| | | | - Ichraf Kraoua
- Department of Child and Adolescent Neurology, National Institute Mongi Ben Hmida of Neurology of Tunis, La Rabta, Tunisia
| | - Paul R Mark
- Spectrum Health Medical Genetics, Grand Rapids, Michigan, USA
| | - Trudy McKanna
- Spectrum Health Medical Genetics, Grand Rapids, Michigan, USA
| | | | - Philippe Moerman
- Department of Pathology, University Hospitals Leuven, Leuven, Belgium
| | - Andrea Poretti
- Division of Pediatric Neurology, University Children's Hospital, Zurich, Switzerland
- Section of Pediatric Neuroradiology, Division of Pediatric Radiology, The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Ratna Puri
- Center of Medical Genetics, Sir Ganga Ram Hospital, Rajinder Nagar, New Delhi, India
| | - Hilde Van Esch
- Department of Human Genetics, Laboratory for the Genetics of Cognition, Center for Human Genetics, KU Leuven, Belgium
| | - Joseph G Gleeson
- Laboratory for Pediatric Brain Disease, New York Genome Center, Howard Hughes Medical Institute, The Rockefeller University, New York, New York, USA
- Department of Neurosciences, University of California San Diego (UCSD), La Jolla, California, USA
- Neurogenetics Laboratory, Howard Hughes Medical Institute, Chevy Chase, Maryland, USA
| | - Enza Maria Valente
- Section of Neurosciences, Department of Medicine and Surgery, University of Salerno, Salerno, Italy
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35
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Clinical utility gene card for: Meckel syndrome - update 2016. Eur J Hum Genet 2016; 24:ejhg201633. [PMID: 27094752 DOI: 10.1038/ejhg.2016.33] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Revised: 03/04/2016] [Accepted: 03/16/2016] [Indexed: 11/09/2022] Open
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36
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Komatsu Y, Suzuki T, Tsurusaki Y, Miyake N, Matsumoto N, Yan K. TMEM67 mutations found in a case of Joubert syndrome with renal hypodysplasia. CEN Case Rep 2016; 5:137-140. [PMID: 28508964 DOI: 10.1007/s13730-015-0210-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Accepted: 12/21/2015] [Indexed: 11/24/2022] Open
Abstract
Joubert syndrome is a rare inherited cerebellar ataxia with the dysgenesis of the cerebellar vermis, called the molar tooth sign. The combination of a large number of causative genes, more than 27, and the various clinical features involving multiple organs has established many genotypic-phenotypic correlations in Joubert syndrome. TMEM67 is one of the genes that are relatively well established as contributing to Joubert syndrome with liver involvement. Here, we report a 2-month-old boy who was initially treated for urinary tract infection, which further led to the diagnosis of Joubert syndrome accompanied by renal hypodysplasia with two different mutations: c.2522A>C and c.1065 + 4Adel in TMEM67.
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Affiliation(s)
- Yumiko Komatsu
- Department of Pediatrics, Kyorin University School of Medicine, 6-20-2, Shinkawa, Mitaka, Tokyo, 181-8611, Japan
| | - Toshifumi Suzuki
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Shiomidai 3-7-1-A504, Isogo-ku, Yokohama, 235-0022, Japan
| | - Yoshinori Tsurusaki
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Shiomidai 3-7-1-A504, Isogo-ku, Yokohama, 235-0022, Japan
| | - Noriko Miyake
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Shiomidai 3-7-1-A504, Isogo-ku, Yokohama, 235-0022, Japan
| | - Naomichi Matsumoto
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Shiomidai 3-7-1-A504, Isogo-ku, Yokohama, 235-0022, Japan
| | - Kunimasa Yan
- Department of Pediatrics, Kyorin University School of Medicine, 6-20-2, Shinkawa, Mitaka, Tokyo, 181-8611, Japan.
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37
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Watson CM, Crinnion LA, Berry IR, Harrison SM, Lascelles C, Antanaviciute A, Charlton RS, Dobbie A, Carr IM, Bonthron DT. Enhanced diagnostic yield in Meckel-Gruber and Joubert syndrome through exome sequencing supplemented with split-read mapping. BMC MEDICAL GENETICS 2016; 17:1. [PMID: 26729329 PMCID: PMC4700600 DOI: 10.1186/s12881-015-0265-z] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Accepted: 12/16/2015] [Indexed: 12/16/2022]
Abstract
Background The widespread adoption of high-throughput sequencing technologies by genetic diagnostic laboratories has enabled significant expansion of their testing portfolios. Rare autosomal recessive conditions have been a particular focus of many new services. Here we report a cohort of 26 patients referred for genetic analysis of Joubert (JBTS) and Meckel-Gruber (MKS) syndromes, two clinically and genetically heterogeneous neurodevelopmental conditions that define a phenotypic spectrum, with MKS at the severe end. Methods Exome sequencing was performed for all cases, using Agilent SureSelect v5 reagents and Illumina paired-end sequencing. For two cases medium-coverage (9×) whole genome sequencing was subsequently undertaken. Results Using a standard analysis pipeline for the detection of single nucleotide and small insertion or deletion variants, molecular diagnoses were confirmed in 12 cases (4 %). Seeking to determine whether our cohort harboured pathogenic copy number variants (CNV), in JBTS- or MKS-associated genes, targeted comparative read-depth analysis was performed using FishingCNV. These analyses identified a putative intragenic AHI1 deletion that included three exons spanning at least 3.4 kb and an intergenic MPP4 to TMEM237 deletion that included exons spanning at least 21.5 kb. Whole genome sequencing enabled confirmation of the deletion-containing alleles and precise characterisation of the mutation breakpoints at nucleotide resolution. These data were validated following development of PCR-based assays that could be subsequently used for “cascade” screening and/or prenatal diagnosis. Conclusions Our investigations expand the AHI1 and TMEM237 mutation spectrum and highlight the importance of performing CNV screening of disease-associated genes. We demonstrate a robust increasingly cost-effective CNV detection workflow that is applicable to all MKS/JBTS referrals. Electronic supplementary material The online version of this article (doi:10.1186/s12881-015-0265-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Christopher M Watson
- Yorkshire Regional Genetics Service, St. James's University Hospital, Leeds, LS9 7TF, UK. .,School of Medicine, University of Leeds, St. James's University Hospital, Leeds, LS9 7TF, UK.
| | - Laura A Crinnion
- Yorkshire Regional Genetics Service, St. James's University Hospital, Leeds, LS9 7TF, UK. .,School of Medicine, University of Leeds, St. James's University Hospital, Leeds, LS9 7TF, UK.
| | - Ian R Berry
- Yorkshire Regional Genetics Service, St. James's University Hospital, Leeds, LS9 7TF, UK.
| | - Sally M Harrison
- School of Medicine, University of Leeds, St. James's University Hospital, Leeds, LS9 7TF, UK.
| | - Carolina Lascelles
- School of Medicine, University of Leeds, St. James's University Hospital, Leeds, LS9 7TF, UK.
| | - Agne Antanaviciute
- School of Medicine, University of Leeds, St. James's University Hospital, Leeds, LS9 7TF, UK.
| | - Ruth S Charlton
- Yorkshire Regional Genetics Service, St. James's University Hospital, Leeds, LS9 7TF, UK.
| | - Angus Dobbie
- Yorkshire Regional Genetics Service, St. James's University Hospital, Leeds, LS9 7TF, UK.
| | - Ian M Carr
- School of Medicine, University of Leeds, St. James's University Hospital, Leeds, LS9 7TF, UK.
| | - David T Bonthron
- Yorkshire Regional Genetics Service, St. James's University Hospital, Leeds, LS9 7TF, UK. .,School of Medicine, University of Leeds, St. James's University Hospital, Leeds, LS9 7TF, UK.
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38
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Slaats GG, Isabella CR, Kroes HY, Dempsey JC, Gremmels H, Monroe GR, Phelps IG, Duran KJ, Adkins J, Kumar SA, Knutzen DM, Knoers NV, Mendelsohn NJ, Neubauer D, Mastroyianni SD, Vogt J, Worgan L, Karp N, Bowdin S, Glass IA, Parisi MA, Otto EA, Johnson CA, Hildebrandt F, van Haaften G, Giles RH, Doherty D. MKS1 regulates ciliary INPP5E levels in Joubert syndrome. J Med Genet 2016; 53:62-72. [PMID: 26490104 PMCID: PMC5060087 DOI: 10.1136/jmedgenet-2015-103250] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Accepted: 09/23/2015] [Indexed: 12/20/2022]
Abstract
BACKGROUND Joubert syndrome (JS) is a recessive ciliopathy characterised by a distinctive brain malformation 'the molar tooth sign'. Mutations in >27 genes cause JS, and mutations in 12 of these genes also cause Meckel-Gruber syndrome (MKS). The goals of this work are to describe the clinical features of MKS1-related JS and determine whether disease causing MKS1 mutations affect cellular phenotypes such as cilium number, length and protein content as potential mechanisms underlying JS. METHODS We measured cilium number, length and protein content (ARL13B and INPP5E) by immunofluorescence in fibroblasts from individuals with MKS1-related JS and in a three-dimensional (3D) spheroid rescue assay to test the effects of disease-related MKS1 mutations. RESULTS We report MKS1 mutations (eight of them previously unreported) in nine individuals with JS. A minority of the individuals with MKS1-related JS have MKS features. In contrast to the truncating mutations associated with MKS, all of the individuals with MKS1-related JS carry ≥ 1 non-truncating mutation. Fibroblasts from individuals with MKS1-related JS make normal or fewer cilia than control fibroblasts, their cilia are more variable in length than controls, and show decreased ciliary ARL13B and INPP5E. Additionally, MKS1 mutant alleles have similar effects in 3D spheroids. CONCLUSIONS MKS1 functions in the transition zone at the base of the cilium to regulate ciliary INPP5E content, through an ARL13B-dependent mechanism. Mutations in INPP5E also cause JS, so our findings in patient fibroblasts support the notion that loss of INPP5E function, due to either mutation or mislocalisation, is a key mechanism underlying JS, downstream of MKS1 and ARL13B.
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Affiliation(s)
- Gisela G. Slaats
- Department of Nephrology and Hypertension, University Medical Center Utrecht, Utrecht, The Netherlands
| | | | - Hester Y. Kroes
- Department of Medical Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | | | - Hendrik Gremmels
- Department of Nephrology and Hypertension, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Glen R. Monroe
- Department of Medical Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Ian G. Phelps
- Department of Pediatrics, University of Washington, Seattle, WA, USA
| | - Karen J. Duran
- Department of Medical Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Jonathan Adkins
- Department of Pediatrics, University of Washington, Seattle, WA, USA
- Division of Integrated Cancer Genomics, Translational Genomics Research Institute, Phoenix, AZ, USA
| | - Sairam A. Kumar
- Department of Pediatrics, University of Washington, Seattle, WA, USA
| | - Dana M. Knutzen
- Department of Pediatrics, University of Washington, Seattle, WA, USA
| | - Nine V. Knoers
- Department of Medical Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Nancy J. Mendelsohn
- Department of Medical Genetics, Children’s Hospitals & Clinics of Minnesota, Minneapolis, MN, USA
| | - David Neubauer
- Department of Child, Adolescent and Developmental Neurology, University Children’s Hospital Ljubljana, Ljubljana, Slovenia
| | | | - Julie Vogt
- West Midlands Regional Genetics Service, Birmingham Women’s Hospital, Birmingham, UK
| | - Lisa Worgan
- Department of Clinical Genetics, Liverpool Hospital, Liverpool, Australia
| | - Natalya Karp
- Medical Genetics Program, Department of Pediatrics, London Health Science Centre, University of Western Ontario, London, Ontario, Canada
| | - Sarah Bowdin
- Division of Clinical and Metabolic Genetics, Department of Paediatrics, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Ian A. Glass
- Department of Pediatrics, University of Washington, Seattle, WA, USA
| | - Melissa A. Parisi
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA
| | - Edgar A. Otto
- Department of Pediatrics and Communicable Diseases, University of Michigan, Ann Arbor, Michigan, USA
| | - Colin A. Johnson
- Section of Ophthalmology and Neuroscience, Leeds Institutes of Molecular Medicine, University of Leeds, Leeds, UK
| | - Friedhelm Hildebrandt
- Division of Nephrology, Boston Children’s Hospital, Boston, MA, USA
- Howard Hughes Medical Institute, Chevy Chase, MD, USA
| | - Gijs van Haaften
- Department of Medical Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Rachel H. Giles
- Department of Nephrology and Hypertension, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Dan Doherty
- Department of Pediatrics, University of Washington, Seattle, WA, USA
- Seattle Children’s Research Institute, Seattle, WA, USA
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39
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Bachmann-Gagescu R, Dempsey JC, Phelps IG, O'Roak BJ, Knutzen DM, Rue TC, Ishak GE, Isabella CR, Gorden N, Adkins J, Boyle EA, de Lacy N, O'Day D, Alswaid A, Ramadevi A R, Lingappa L, Lourenço C, Martorell L, Garcia-Cazorla À, Ozyürek H, Haliloğlu G, Tuysuz B, Topçu M, Chance P, Parisi MA, Glass IA, Shendure J, Doherty D. Joubert syndrome: a model for untangling recessive disorders with extreme genetic heterogeneity. J Med Genet 2015; 52:514-22. [PMID: 26092869 PMCID: PMC5082428 DOI: 10.1136/jmedgenet-2015-103087] [Citation(s) in RCA: 191] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Accepted: 06/01/2015] [Indexed: 12/23/2022]
Abstract
BACKGROUND Joubert syndrome (JS) is a recessive neurodevelopmental disorder characterised by hypotonia, ataxia, cognitive impairment, abnormal eye movements, respiratory control disturbances and a distinctive mid-hindbrain malformation. JS demonstrates substantial phenotypic variability and genetic heterogeneity. This study provides a comprehensive view of the current genetic basis, phenotypic range and gene-phenotype associations in JS. METHODS We sequenced 27 JS-associated genes in 440 affected individuals (375 families) from a cohort of 532 individuals (440 families) with JS, using molecular inversion probe-based targeted capture and next-generation sequencing. Variant pathogenicity was defined using the Combined Annotation Dependent Depletion algorithm with an optimised score cut-off. RESULTS We identified presumed causal variants in 62% of pedigrees, including the first B9D2 mutations associated with JS. 253 different mutations in 23 genes highlight the extreme genetic heterogeneity of JS. Phenotypic analysis revealed that only 34% of individuals have a 'pure JS' phenotype. Retinal disease is present in 30% of individuals, renal disease in 25%, coloboma in 17%, polydactyly in 15%, liver fibrosis in 14% and encephalocele in 8%. Loss of CEP290 function is associated with retinal dystrophy, while loss of TMEM67 function is associated with liver fibrosis and coloboma, but we observe no clear-cut distinction between JS subtypes. CONCLUSIONS This work illustrates how combining advanced sequencing techniques with phenotypic data addresses extreme genetic heterogeneity to provide diagnostic and carrier testing, guide medical monitoring for progressive complications, facilitate interpretation of genome-wide sequencing results in individuals with a variety of phenotypes and enable gene-specific treatments in the future.
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Affiliation(s)
- R Bachmann-Gagescu
- Institute for Molecular Life Sciences and Institute of Medical Genetics, University of Zurich, Zurich, Switzerland
| | - J C Dempsey
- Department of Pediatrics, University of Washington, Seattle, Washington, USA
| | - I G Phelps
- Department of Pediatrics, University of Washington, Seattle, Washington, USA
| | - B J O'Roak
- Molecular and Medical Genetics, Oregon Health and Science University, Portland, Oregon, USA
| | - D M Knutzen
- Department of Oncology, Franciscan Health System, Tacoma, Washington, USA
| | - T C Rue
- Department of Biostatistics, University of Washington, Seattle, Washington, USA
| | - G E Ishak
- Department of Radiology, University of Washington, Seattle Children's Hospital, Seattle, Washington, USA
| | - C R Isabella
- Department of Pediatrics, University of Washington, Seattle, Washington, USA
| | - N Gorden
- Department of Internal Medicine, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - J Adkins
- Division of Integrated Cancer Genomics, Translational Genomics Research Institute, Phoenix, Arizona, USA
| | - E A Boyle
- Department of Genome Sciences, University of Washington, Seattle, Washington, USA
| | - N de Lacy
- Department of Psychiatry, University of Washington, Seattle, Washington, USA
| | - D O'Day
- Department of Pediatrics, University of Washington, Seattle, Washington, USA
| | - A Alswaid
- Department of Pediatrics, King Abdulaziz Medical City, Riyadh, Saudi Arabia
| | | | - L Lingappa
- Department of Child Neurology, Rainbow Children Hospital, Hyderabad, India
| | - C Lourenço
- Department of Neurosciences and Behavior Neurosciences, School of Medicine of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - L Martorell
- Department of Genetica Molecular, Hospital Sant Joan de Deu, Barcelona, Spain
| | - À Garcia-Cazorla
- Department of Neurology, Neurometabolic Unit, Hospital Sant Joan de Déu and CIBERER, ISCIII, Barcelona, Spain
| | - H Ozyürek
- Department of Pediatric Neurology, Faculty of Medicine, Ondokuz Mayis University, Samsun, Turkey
| | - G Haliloğlu
- Department of Pediatric Neurology, Hacettepe University Children's Hospital, Ankara, Turkey
| | - B Tuysuz
- Department of Pediatric Genetics, Cerrahpasa Medical School, Istanbul University, Istanbul, Turkey
| | - M Topçu
- Department of Pediatric Neurology, Hacettepe University Children's Hospital, Ankara, Turkey
| | - P Chance
- Department of Pediatrics, University of Washington, Seattle, Washington, USA
| | - M A Parisi
- National Institute of Child Health and Human Development, NIH, Bethesda, Maryland, USA
| | - I A Glass
- Department of Pediatrics, University of Washington, Seattle, Washington, USA Seattle Children's Research Institute, Seattle, Washington, USA
| | - J Shendure
- Department of Genome Sciences, University of Washington, Seattle, Washington, USA
| | - D Doherty
- Department of Pediatrics, University of Washington, Seattle, Washington, USA Seattle Children's Research Institute, Seattle, Washington, USA
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Zhang M, Cheng J, Liu A, Wang L, Xiong L, Chen M, Sun Y, Li J, Lu Y, Yuan H, Li Y, Lu Y. A missense mutation in TMEM67 causes Meckel-Gruber syndrome type 3 (MKS3): a family from China. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2015; 8:5379-5386. [PMID: 26191240 PMCID: PMC4503111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Accepted: 03/23/2015] [Indexed: 06/04/2023]
Abstract
Meckel-Gruber syndrome (MKS) is a lethal autosomal recessive condition characterized by renal cysts and variably associated features, including developmental anomalies of the central nervous system (typically encephalocele), hepatic ductal dysplasia and cysts, and polydactyly. Genetic heterogeneity has been demonstrated at eleven loci, MKS1-11. Here, we present the clinical and molecular characteristics of a Chinese MKS3 family with occipital encephalocele and kidney enlargement. DNA sequencing of affected fetuses revealed a homozygous c.1645C>T substitution in exon 16 of TMEM67, leading to a p.R549C substitution in meckelin. The R549 residue is highly conserved across human, rat, mouse, zebrafish, chicken, wolf and platypus genomes. Hha I restriction analysis demonstrated that the c.1645C>T mutation was absent in 200 unrelated control chromosomes of Chinese background, supporting the hypothesis that it represents causative mutation, not rare polymorphism. Our data provide additional molecular and clinical information for establishing a better genotype-phenotype understanding of MKS.
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Affiliation(s)
- Manli Zhang
- Department of Obstetrics and Gynecology, Chinese PLA General HospitalBeijing 100853, China
| | - Jing Cheng
- Institute of Otolaryngology, Chinese PLA General HospitalBeijing 100853, China
| | - Aijun Liu
- Department of Pathology, Chinese PLA General HospitalBeijing 100853, China
| | - Longxia Wang
- Department of Ultrasound, Chinese PLA General HospitalBeijing 100853, China
| | - Lihua Xiong
- Department of Obstetrics and Gynecology, Chinese PLA General HospitalBeijing 100853, China
| | - Meixia Chen
- Department of Obstetrics and Gynecology, Chinese PLA General HospitalBeijing 100853, China
| | - Yi Sun
- Department of Otolaryngology, Wuhan General HospitalWuhan 430070, China
| | - Jianzhong Li
- Fuzhou General Hospital of Nanjing Command PLAFuzhou 350025, China
| | - Yu Lu
- Institute of Otolaryngology, Chinese PLA General HospitalBeijing 100853, China
| | - Huijun Yuan
- Institute of Otolaryngology, Chinese PLA General HospitalBeijing 100853, China
| | - Yali Li
- Department of Obstetrics and Gynecology, Chinese PLA General HospitalBeijing 100853, China
| | - Yanping Lu
- Department of Obstetrics and Gynecology, Chinese PLA General HospitalBeijing 100853, China
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TTBK2: a tau protein kinase beyond tau phosphorylation. BIOMED RESEARCH INTERNATIONAL 2015; 2015:575170. [PMID: 25950000 PMCID: PMC4407412 DOI: 10.1155/2015/575170] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 03/11/2015] [Accepted: 03/25/2015] [Indexed: 12/12/2022]
Abstract
Tau tubulin kinase 2 (TTBK2) is a kinase known to phosphorylate tau and tubulin. It has recently drawn much attention due to its involvement in multiple important cellular processes. Here, we review the current understanding of TTBK2, including its sequence, structure, binding sites, phosphorylation substrates, and cellular processes involved. TTBK2 possesses a casein kinase 1 (CK1) kinase domain followed by a ~900 amino acid segment, potentially responsible for its localization and substrate recruitment. It is known to bind to CEP164, a centriolar protein, and EB1, a microtubule plus-end tracking protein. In addition to autophosphorylation, known phosphorylation substrates of TTBK2 include tau, tubulin, CEP164, CEP97, and TDP-43, a neurodegeneration-associated protein. Mutations of TTBK2 are associated with spinocerebellar ataxia type 11. In addition, TTBK2 is essential for regulating the growth of axonemal microtubules in ciliogenesis. It also plays roles in resistance of cancer target therapies and in regulating glucose and GABA transport. Reported sites of TTBK2 localization include the centriole/basal body, the midbody, and possibly the mitotic spindles. Together, TTBK2 is a multifunctional kinase involved in important cellular processes and demands augmented efforts in investigating its functions.
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Madhivanan K, Aguilar RC. Ciliopathies: the trafficking connection. Traffic 2014; 15:1031-56. [PMID: 25040720 DOI: 10.1111/tra.12195] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Revised: 06/28/2014] [Accepted: 07/08/2014] [Indexed: 12/15/2022]
Abstract
The primary cilium (PC) is a very dynamic hair-like membrane structure that assembles/disassembles in a cell-cycle-dependent manner and is present in almost every cell type. Despite being continuous with the plasma membrane, a diffusion barrier located at the ciliary base confers the PC properties of a separate organelle with very specific characteristics and membrane composition. Therefore, vesicle trafficking is the major process by which components are acquired for cilium formation and maintenance. In fact, a system of specific sorting signals controls the right of cargo admission into the cilia. Disruption to the ciliary structure or its function leads to multiorgan diseases known as ciliopathies. These illnesses arise from a spectrum of mutations in any of the more than 50 loci linked to these conditions. Therefore, it is not surprising that symptom variability (specific manifestations and severity) among and within ciliopathies appears to be an emerging characteristic. Nevertheless, one can speculate that mutations occurring in genes whose products contribute to the overall vesicle trafficking to the PC (i.e. affecting cilia assembly) will lead to more severe symptoms, whereas those involved in the transport of specific cargoes will result in milder phenotypes. In this review, we summarize the trafficking mechanisms to the cilia and also provide a description of the trafficking defects observed in some ciliopathies which can be correlated to the severity of the pathology.
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Mutations in B9D1 and MKS1 cause mild Joubert syndrome: expanding the genetic overlap with the lethal ciliopathy Meckel syndrome. Orphanet J Rare Dis 2014; 9:72. [PMID: 24886560 PMCID: PMC4113192 DOI: 10.1186/1750-1172-9-72] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Accepted: 04/29/2014] [Indexed: 11/10/2022] Open
Abstract
Joubert syndrome is a clinically and genetically heterogeneous ciliopathy characterized by a typical cerebellar and brainstem malformation (the "molar tooth sign"), and variable multiorgan involvement. To date, 24 genes have been found mutated in Joubert syndrome, of which 13 also cause Meckel syndrome, a lethal ciliopathy with kidney, liver and skeletal involvement. Here we describe four patients with mild Joubert phenotypes who carry pathogenic mutations in either MKS1 or B9D1, two genes previously implicated only in Meckel syndrome.
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Abstract
Primary cilia are generally solitary organelles that emanate from the surface of almost all vertebrate cell types. Until recently, details regarding the function of these structures were lacking; however, extensive evidence now suggests that primary cilia have critical roles in sensing the extracellular environment, and in coordinating developmental and homeostatic signalling pathways. Furthermore, disruption of these functions seems to underlie a diverse spectrum of disorders, known as primary ciliopathies. These disorders are characterized by wide-ranging clinical and genetic heterogeneity, but with substantial overlap among distinct conditions. Indeed, ciliopathies are associated with a large variety of manifestations that often include distinctive neurological findings. Herein, we review neurological features associated with primary ciliopathies, highlight genotype-phenotype correlations, and discuss potential mechanisms underlying these findings.
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Abstract
Joubert syndrome is a congenital cerebellar ataxia with autosomal recessive or X-linked inheritance, the diagnostic hallmark of which is a unique cerebellar and brainstem malformation recognisable on brain imaging-the so-called molar tooth sign. Neurological signs are present from the neonatal period and include hypotonia progressing to ataxia, global developmental delay, ocular motor apraxia, and breathing dysregulation. These signs are variably associated with multiorgan involvement, mainly of the retina, kidneys, skeleton, and liver. 21 causative genes have been identified so far, all of which encode for proteins of the primary cilium or its apparatus. The primary cilium is a subcellular organelle that has key roles in development and in many cellular functions, making Joubert syndrome part of the expanding family of ciliopathies. Notable clinical and genetic overlap exists between distinct ciliopathies, which can co-occur even within families. Such variability is probably explained by an oligogenic model of inheritance, in which the interplay of mutations, rare variants, and polymorphisms at distinct loci modulate the expressivity of the ciliary phenotype.
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Travaglini L, Brancati F, Silhavy J, Iannicelli M, Nickerson E, Elkhartoufi N, Scott E, Spencer E, Gabriel S, Thomas S, Ben-Zeev B, Bertini E, Boltshauser E, Chaouch M, Cilio MR, de Jong MM, Kayserili H, Ogur G, Poretti A, Signorini S, Uziel G, Zaki MS, Johnson C, Attié-Bitach T, Gleeson JG, Valente EM. Phenotypic spectrum and prevalence of INPP5E mutations in Joubert syndrome and related disorders. Eur J Hum Genet 2013; 21:1074-8. [PMID: 23386033 DOI: 10.1038/ejhg.2012.305] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Revised: 10/03/2012] [Accepted: 12/05/2012] [Indexed: 11/09/2022] Open
Abstract
Joubert syndrome and related disorders (JSRD) are clinically and genetically heterogeneous ciliopathies sharing a peculiar midbrain-hindbrain malformation known as the 'molar tooth sign'. To date, 19 causative genes have been identified, all coding for proteins of the primary cilium. There is clinical and genetic overlap with other ciliopathies, in particular with Meckel syndrome (MKS), that is allelic to JSRD at nine distinct loci. We previously identified the INPP5E gene as causative of JSRD in seven families linked to the JBTS1 locus, yet the phenotypic spectrum and prevalence of INPP5E mutations in JSRD and MKS remain largely unknown. To address this issue, we performed INPP5E mutation analysis in 483 probands, including 408 JSRD patients representative of all clinical subgroups and 75 MKS fetuses. We identified 12 different mutations in 17 probands from 11 JSRD families, with an overall 2.7% mutation frequency among JSRD. The most common clinical presentation among mutated families (7/11, 64%) was Joubert syndrome with ocular involvement (either progressive retinopathy and/or colobomas), while the remaining cases had pure JS. Kidney, liver and skeletal involvement were not observed. None of the MKS fetuses carried INPP5E mutations, indicating that the two ciliopathies are not allelic at this locus.
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Affiliation(s)
- Lorena Travaglini
- 1] IRCCS Casa Sollievo della Sofferenza, Mendel Laboratory San Giovanni Rotondo, San Giovanni Rotondo, Italy [2] Unit of Molecular Medicine for Neuromuscular and Neurodegenerative Diseases, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
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Szymanska K, Berry I, Logan CV, Cousins SR, Lindsay H, Jafri H, Raashid Y, Malik-Sharif S, Castle B, Ahmed M, Bennett C, Carlton R, Johnson CA. Founder mutations and genotype-phenotype correlations in Meckel-Gruber syndrome and associated ciliopathies. Cilia 2012; 1:18. [PMID: 23351400 PMCID: PMC3579735 DOI: 10.1186/2046-2530-1-18] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2012] [Accepted: 06/21/2012] [Indexed: 11/21/2022] Open
Abstract
Background Meckel-Gruber syndrome (MKS) is an autosomal recessive lethal condition that is a ciliopathy. MKS has marked phenotypic variability and genetic heterogeneity, with mutations in nine genes identified as causative to date. Methods Families diagnosed with Meckel-Gruber syndrome were recruited for research studies following informed consent. DNA samples were analyzed by microsatellite genotyping and direct Sanger sequencing. Results We now report the genetic analyses of 87 individuals from 49 consanguineous and 19 non-consanguineous families in an unselected cohort with reported MKS, or an associated severe ciliopathy in a kindred. Linkage and/or direct sequencing were prioritized for seven MKS genes (MKS1, TMEM216, TMEM67/MKS3, RPGRIP1L, CC2D2A, CEP290 and TMEM237) selected on the basis of reported frequency of mutations or ease of analysis. We have identified biallelic mutations in 39 individuals, of which 13 mutations are novel and previously unreported. We also confirm general genotype-phenotype correlations. Conclusions TMEM67 was the most frequently mutated gene in this cohort, and we confirm two founder splice-site mutations (c.1546 + 1 G > A and c.870-2A > G) in families of Pakistani ethnic origin. In these families, we have also identified two separate founder mutations for RPGRIP1L (c. 1945 C > T p.R649X) and CC2D2A (c. 3540delA p.R1180SfsX6). Two missense mutations in TMEM67 (c. 755 T > C p.M252T, and c. 1392 C > T p.R441C) are also probable founder mutations. These findings will contribute to improved genetic diagnosis and carrier testing for affected families, and imply the existence of further genetic heterogeneity in this syndrome.
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Affiliation(s)
- Katarzyna Szymanska
- Section of Ophthalmology and Neurosciences, Leeds Institute of Molecular Medicine, St, James's University Hospital, Leeds, UK.
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Poretti A, Vitiello G, Hennekam RCM, Arrigoni F, Bertini E, Borgatti R, Brancati F, D'Arrigo S, Faravelli F, Giordano L, Huisman TAGM, Iannicelli M, Kluger G, Kyllerman M, Landgren M, Lees MM, Pinelli L, Romaniello R, Scheer I, Schwarz CE, Spiegel R, Tibussek D, Valente EM, Boltshauser E. Delineation and diagnostic criteria of Oral-Facial-Digital Syndrome type VI. Orphanet J Rare Dis 2012; 7:4. [PMID: 22236771 PMCID: PMC3313869 DOI: 10.1186/1750-1172-7-4] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2011] [Accepted: 01/11/2012] [Indexed: 01/20/2023] Open
Abstract
Oral-Facial-Digital Syndrome type VI (OFD VI) represents a rare phenotypic subtype of Joubert syndrome and related disorders (JSRD). In the original report polydactyly, oral findings, intellectual disability, and absence of the cerebellar vermis at post-mortem characterized the syndrome. Subsequently, the molar tooth sign (MTS) has been found in patients with OFD VI, prompting the inclusion of OFD VI in JSRD. We studied the clinical, neurodevelopmental, neuroimaging, and genetic findings in a cohort of 16 patients with OFD VI. We derived the following inclusion criteria from the literature: 1) MTS and one oral finding and polydactyly, or 2) MTS and more than one typical oral finding. The OFD VI neuroimaging pattern was found to be more severe than in other JSRD subgroups and includes severe hypoplasia of the cerebellar vermis, hypoplastic and dysplastic cerebellar hemispheres, marked enlargement of the posterior fossa, increased retrocerebellar collection of cerebrospinal fluid, abnormal brainstem, and frequently supratentorial abnormalities that occasionally include characteristic hypothalamic hamartomas. Additionally, two new JSRD neuroimaging findings (ascending superior cerebellar peduncles and fused thalami) have been identified. Tongue hamartomas, additional frenula, upper lip notch, and mesoaxial polydactyly are specific findings in OFD VI, while cleft lip/palate and other types of polydactyly of hands and feet are not specific. Involvement of other organs may include ocular findings, particularly colobomas. The majority of the patients have absent motor development and profound cognitive impairment. In OFD VI, normal cognitive functions are possible, but exceptional. Sequencing of known JSRD genes in most patients failed to detect pathogenetic mutations, therefore the genetic basis of OFD VI remains unknown. Compared with other JSRD subgroups, the neurological findings and impairment of motor development and cognitive functions in OFD VI are significantly worse, suggesting a correlation with the more severe neuroimaging findings. Based on the literature and this study we suggest as diagnostic criteria for OFD VI: MTS and one or more of the following: 1) tongue hamartoma(s) and/or additional frenula and/or upper lip notch; 2) mesoaxial polydactyly of one or more hands or feet; 3) hypothalamic hamartoma.
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Affiliation(s)
- Andrea Poretti
- Department of Pediatric Neurology, University Children's Hospital of Zurich, Switzerland
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Novarino G, Akizu N, Gleeson JG. Modeling human disease in humans: the ciliopathies. Cell 2011; 147:70-9. [PMID: 21962508 DOI: 10.1016/j.cell.2011.09.014] [Citation(s) in RCA: 137] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2011] [Indexed: 11/26/2022]
Abstract
Soon, the genetic basis of most human Mendelian diseases will be solved. The next challenge will be to leverage this information to uncover basic mechanisms of disease and develop new therapies. To understand how this transformation is already beginning to unfold, we focus on the ciliopathies, a class of multi-organ diseases caused by disruption of the primary cilium. Through a convergence of data involving mutant gene discovery, proteomics, and cell biology, more than a dozen phenotypically distinguishable conditions are now united as ciliopathies. Sitting at the interface between simple and complex genetic conditions, these diseases provide clues to the future direction of human genetics.
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Affiliation(s)
- Gaia Novarino
- Neurogenetics Laboratory, Institute for Genomic Medicine, Howard Hughes Medical Institute, Department of Neurosciences and Pediatrics, University of California, San Diego, La Jolla 92093, USA
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Salonen R, Kestilä M, Bergmann C. Clinical utility gene card for: Meckel syndrome. Eur J Hum Genet 2011; 19:ejhg2010255. [PMID: 21368913 DOI: 10.1038/ejhg.2010.255] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- R Salonen
- Department of Medical Genetics, Väestöliitto, Helsinki, Finland.
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