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Akalın A, Şimşek-Kiper PÖ, Taşkıran EZ, Karaosmanoğlu B, Utine GE, Boduroğlu K. A novel biallelic CRIPT variant in a patient with short stature, microcephaly, and distinctive facial features. Am J Med Genet A 2023; 191:1119-1127. [PMID: 36630262 DOI: 10.1002/ajmg.a.63120] [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: 09/11/2022] [Revised: 12/11/2022] [Accepted: 12/29/2022] [Indexed: 01/12/2023]
Abstract
Primordial dwarfism (PD) is one of a highly heterogeneous group of disorders characterized by severe prenatal/postnatal growth restriction. Defects in various pathways such as DNA repair mechanism, impaired centrioles, abnormal IGF expression, and spliceosomal machinery may cause PD including Seckel syndrome, Silver-Russell syndrome. Microcephalic osteodysplastic primordial dwarfism (MOPD) types I/III, II, and Meier-Gorlin syndrome. In recent years with the wide application of exome sequencing (ES) in the field of PD, new genes involved in novel pathways causing new phenotypes have been identified. Pathogenic variants in CRIPT (MIM# 604594) encoding cysteine-rich PDZ domain-binding protein have recently been described in patients with PD with a unique phenotype. This phenotype is characterized by prenatal/postnatal growth restriction, facial dysmorphism, ocular abnormalities, and ectodermal findings such as skin lesions with hyper/hypopigmented patchy areas and hair abnormalities. To our knowledge, only three patients with homozygous or compound heterozygous variants in CRIPT have been reported so far. Here, we report on a male patient who presented with profound prenatal/postnatal growth restriction, developmental delay, dysmorphic facial features, and skin lesions along with the findings of bicytopenia and extensive retinal pigmentation defect. A novel truncating homozygous variant c.7_8delTG; p.(Cys3Argfs*4) was detected in CRIPT with the aid of ES. With this report, we further expand the mutational and clinical spectrum of this rare entity.
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Affiliation(s)
- Akçahan Akalın
- Department of Pediatric Genetics, Hacettepe University Faculty of Medicine, Ankara, Turkey
| | | | - Ekim Z Taşkıran
- Department of Medical Genetics, Hacettepe University Faculty of Medicine, Ankara, Turkey
| | - Beren Karaosmanoğlu
- Department of Medical Genetics, Hacettepe University Faculty of Medicine, Ankara, Turkey
| | - Gülen Eda Utine
- Department of Pediatric Genetics, Hacettepe University Faculty of Medicine, Ankara, Turkey
| | - Koray Boduroğlu
- Department of Pediatric Genetics, Hacettepe University Faculty of Medicine, Ankara, Turkey
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2
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Iyer J, Gentry LK, Bergwell M, Smith A, Guagliardo S, Kropp PA, Sankaralingam P, Liu Y, Spooner E, Bowerman B, O’Connell KF. The chromatin remodeling protein CHD-1 and the EFL-1/DPL-1 transcription factor cooperatively down regulate CDK-2 to control SAS-6 levels and centriole number. PLoS Genet 2022; 18:e1009799. [PMID: 35377871 PMCID: PMC9009770 DOI: 10.1371/journal.pgen.1009799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 04/14/2022] [Accepted: 03/17/2022] [Indexed: 11/24/2022] Open
Abstract
Centrioles are submicron-scale, barrel-shaped organelles typically found in pairs, and play important roles in ciliogenesis and bipolar spindle assembly. In general, successful execution of centriole-dependent processes is highly reliant on the ability of the cell to stringently control centriole number. This in turn is mainly achieved through the precise duplication of centrioles during each S phase. Aberrations in centriole duplication disrupt spindle assembly and cilia-based signaling and have been linked to cancer, primary microcephaly and a variety of growth disorders. Studies aimed at understanding how centriole duplication is controlled have mainly focused on the post-translational regulation of two key components of this pathway: the master regulatory kinase ZYG-1/Plk4 and the scaffold component SAS-6. In contrast, how transcriptional control mechanisms might contribute to this process have not been well explored. Here we show that the chromatin remodeling protein CHD-1 contributes to the regulation of centriole duplication in the C. elegans embryo. Specifically, we find that loss of CHD-1 or inactivation of its ATPase activity can restore embryonic viability and centriole duplication to a strain expressing insufficient ZYG-1 activity. Interestingly, loss of CHD-1 is associated with increases in the levels of two ZYG-1-binding partners: SPD-2, the centriole receptor for ZYG-1 and SAS-6. Finally, we explore transcriptional regulatory networks governing centriole duplication and find that CHD-1 and a second transcription factor, EFL-1/DPL-1 cooperate to down regulate expression of CDK-2, which in turn promotes SAS-6 protein levels. Disruption of this regulatory network results in the overexpression of SAS-6 and the production of extra centrioles. Centrioles are cellular constituents that play an important role in cell reproduction, signaling and movement. To properly function, centrioles must be present in the cell at precise numbers. Errors in maintaining centriole number result in cell division defects and diseases such as cancer and microcephaly. How the cell maintains proper centriole copy number is not entirely understood. Here we show that two transcription factors, EFL-1/DPL-1 and CHD-1 cooperate to reduce expression of CDK-2, a master regulator of the cell cycle. We find that CDK-2 in turn promotes expression of SAS-6, a major building block of centrioles. When EFL-1/DPL-1 and CHD-1 are inhibited, CDK-2 is overexpressed. This leads to increased levels of SAS-6 and excess centrioles. Our work thus demonstrates a novel mechanism for controlling centriole number and is thus relevant to those human diseases caused by defects in centriole copy number control.
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Affiliation(s)
- Jyoti Iyer
- Department of Chemistry and Biochemistry, University of Tulsa, Tulsa, Oklahoma, United States of America
- * E-mail: (JI); (KFO)
| | - Lindsey K. Gentry
- Laboratory of Biochemistry and Genetics, National Institutes of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, Maryland, United States of America
| | - Mary Bergwell
- Department of Chemistry and Biochemistry, University of Tulsa, Tulsa, Oklahoma, United States of America
| | - Amy Smith
- Department of Chemistry and Biochemistry, University of Tulsa, Tulsa, Oklahoma, United States of America
| | - Sarah Guagliardo
- Laboratory of Biochemistry and Genetics, National Institutes of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, Maryland, United States of America
| | - Peter A. Kropp
- Laboratory of Biochemistry and Genetics, National Institutes of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, Maryland, United States of America
| | - Prabhu Sankaralingam
- Laboratory of Biochemistry and Genetics, National Institutes of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, Maryland, United States of America
| | - Yan Liu
- Laboratory of Biochemistry and Genetics, National Institutes of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, Maryland, United States of America
| | - Eric Spooner
- Proteomics Core Facility, Whitehead Institute for Biomedical Research, Cambridge Massachusetts, United States of America
| | - Bruce Bowerman
- Institute of Molecular Biology, University of Oregon, Eugene, Oregon, United States of America
| | - Kevin F. O’Connell
- Laboratory of Biochemistry and Genetics, National Institutes of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, Maryland, United States of America
- * E-mail: (JI); (KFO)
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Wang W, Sun H, Ye Y, Shao Z, Xiao Y. Influence and Effect of Acupoint Application of Chinese Medicine on Height and Bone Age of Children with Short Stature. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE : ECAM 2021; 2021:7459593. [PMID: 34745301 PMCID: PMC8570854 DOI: 10.1155/2021/7459593] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Accepted: 10/02/2021] [Indexed: 11/23/2022]
Abstract
OBJECTIVE To explore the effect of acupoint application of Chinese medicine on children's height and bone age. METHODS Altogether, 120 children with a short stature treated in our hospital from September 2017 to September 2018 were divided into the control group (CG, n = 60) and the observation group (OG, n = 60) according to the random number table method. The children in CG were given healthy diet and exercise plans and supplemented with daily vitamin intake. The OG was treated with acupoint application of Chinese medicine on the basis of the CG. The clinical efficacy of the CG and the OG of children after treatment was observed. The height increment, growth rate, and bone age of children were compared before and after treatment. The levels of IGF-1 and 25-(OH)D in the serum of children before and after treatment were tested. According to the clinical curative effect after treatment, the children were divided into good curative effect group (markedly effective + effective) and poor curative effect group (ineffective). Logistics regression analysis was applied to analyze the risk factors. RESULTS Compared with the CG, the curative effect on the OG was evidently improved (P < 0.05). In addition, the height increment, the growth speed, and the bone age of the OG increased evidently (P < 0.05). Compared with the CG, the expression of IGF-1 and 25-(OH)D of the OG elevated (P < 0.05). Serum IGF-1 and 25-(OH)D concentrations were positively correlated with growth rate and bone age (P < 0.05). Risk factors analysis showed that disease course, IGF-1, 25-(OH)D expression, and heredity were the risk factors affecting the curative effect on children. CONCLUSION Acupoint application of Chinese medicine has effect on the height and bone age of children with short stature, which is worthy of clinical promotion. In addition, early treatment should be carried out to improve the clinical efficacy of children.
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Affiliation(s)
- Weiqun Wang
- Department of Pediatrics, Zhejiang Provincial Integrated Chinese and Western Medicine Hospital, Hangzhou, Zhejiang 310003, China
| | - Hong Sun
- Department of Pediatrics, Zhejiang Provincial Integrated Chinese and Western Medicine Hospital, Hangzhou, Zhejiang 310003, China
| | - Yushuang Ye
- Department of Traditional Chinese Medicine, Hangzhou Shangcheng District Caihe Street Community Health Service Center, Hangzhou, Zhejiang 310020, China
| | - Zhengyang Shao
- Department of Pediatrics, Zhejiang Provincial Integrated Chinese and Western Medicine Hospital, Hangzhou, Zhejiang 310003, China
| | - Yuping Xiao
- Department of Pediatrics, The Second Affiliated Hospital of Zhejiang University, Hangzhou, Zhejiang 310030, China
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Yang LL, Liang SS. Study on pathogenic genes of dwarfism disease by next-generation sequencing. World J Clin Cases 2021; 9:1600-1609. [PMID: 33728303 PMCID: PMC7942040 DOI: 10.12998/wjcc.v9.i7.1600] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 12/10/2020] [Accepted: 12/25/2020] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND There are many factors that lead to dwarfism, and the mechanism has not yet been elucidated. Next-generation sequencing may identify candidate-related gene mutations, which may clarify the molecular cause.
AIM To analyze genetic variation by using a constructed panel related to dwarfism by utilizing next-generation sequencing platform sequencing analysis to screen candidate-related gene mutations.
METHODS Physical and laboratory characteristics, including clinical examination, growth hormone drug challenge test, serum insulin-like growth factor-1 (IGF-1), IGF binding protein 3, other related tests, imaging examination, and chromosome karyotyping, were analyzed. Next-generation sequencing was performed to analyze pathogenicity variability.
RESULTS In the 39 dwarfism patients, 10 had pathogenicity variability. Gene variation was found in the OBSL1, SLC26A2, PTPN11, COL27AI, HDAC6, CUL7, FGFR3, DYNC2H1, GH1, and ATP7B genes. Of the 10 patients with pathogenicity variability, the related physical characteristics included double breast development and growth hormone deficiency, enuresis and indirect inguinal hernia on the left, two finger distance of 70.2 cm, head circumference of 49.2 cm, ischium/lower body length of 1.8 cm, weak limb muscles, and partial growth hormone deficiency. After 6 mo of growth hormone therapy, the concentrations of IGF-1 and IGF binding protein 3 increased from 215.2 ± 170.3 to 285.0 ± 166.0 and 3.9 ± 1.4 to 4.2 ± 1.1, respectively.
CONCLUSION OBSL1, SLC26A2, PTPN11, COL27AI, HDAC6, CUL7, FGFR3, DYNC2H1, GH1, and ATP7B genes may be related to the incidence of dwarfism, and more research needs to be performed to elucidate the mechanism.
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Affiliation(s)
- Lv-Lv Yang
- Department of Pediatrics, Quanzhou First Hospital, Quanzhou 362000, Fujian Province, China
| | - Shi-Shan Liang
- Department of Pediatrics, Quanzhou First Hospital, Quanzhou 362000, Fujian Province, China
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Abdel-Salam GMH, Sayed ISM, Afifi HH, Abdel-Ghafar SF, Abouzaid MR, Ismail SI, Aglan MS, Issa MY, El-Bassyouni HT, El-Kamah G, Effat LK, Eid M, Zaki MS, Temtamy SA, Abdel-Hamid MS. Microcephalic osteodysplastic primordial dwarfism type II: Additional nine patients with implications on phenotype and genotype correlation. Am J Med Genet A 2020; 182:1407-1420. [PMID: 32267100 DOI: 10.1002/ajmg.a.61585] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 02/20/2020] [Accepted: 03/09/2020] [Indexed: 11/10/2022]
Abstract
PCNT encodes a large coiled- protein localizing to pericentriolar material and is associated with microcephalic osteodysplastic primordial dwarfism type II syndrome (MOPD II). We report our experience of nine new patients from seven unrelated consanguineous Egyptian families with the distinctive clinical features of MOPD II in whom a customized NGS panel showed homozygous truncating variants of PCNT. The NGS panel results were validated thereafter using Sanger sequencing revealing three previously reported and three novel PCNT pathogenic variants. The core phenotype appeared homogeneous to what had been reported before although patients differed in the severity showing inter and intra familial variability. The orodental pattern showed atrophic alveolar ridge (five patients), rootless tooth (four patients), tooth agenesis (three patients), and malformed tooth (three patients). In addition, mesiodens was a novel finding found in one patient. The novel c.9394-1G>T variant was found in two sibs who had tooth agenesis. CNS anomalies with possible vascular sequelae were documented in two male patients (22.2%). Simplified gyral pattern with poor development of the frontal horns of lateral ventricles was seen in four patients and mild thinning of the corpus callosum in two patients. Unilateral coronal craniosynstosis was noted in one patient and thick but short corpus callosum was an unusual finding noted in another. The later has not been reported before. Our results refine the clinical, neuroradiological, and orodental features and expand the molecular spectrum of MOPD II.
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Affiliation(s)
- Ghada M H Abdel-Salam
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt.,Centre of Excellence for Human Genetics, National Research Centre, Cairo, Egypt
| | - Inas S M Sayed
- Centre of Excellence for Human Genetics, National Research Centre, Cairo, Egypt.,Orodental Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Hanan H Afifi
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt.,Centre of Excellence for Human Genetics, National Research Centre, Cairo, Egypt
| | - Sherif F Abdel-Ghafar
- Centre of Excellence for Human Genetics, National Research Centre, Cairo, Egypt.,Medical Molecular Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Maha R Abouzaid
- Centre of Excellence for Human Genetics, National Research Centre, Cairo, Egypt.,Orodental Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Samira I Ismail
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt.,Centre of Excellence for Human Genetics, National Research Centre, Cairo, Egypt
| | - Mona S Aglan
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt.,Centre of Excellence for Human Genetics, National Research Centre, Cairo, Egypt
| | - Mahmoud Y Issa
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt.,Centre of Excellence for Human Genetics, National Research Centre, Cairo, Egypt
| | - Hala T El-Bassyouni
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt.,Centre of Excellence for Human Genetics, National Research Centre, Cairo, Egypt
| | - Ghada El-Kamah
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt.,Centre of Excellence for Human Genetics, National Research Centre, Cairo, Egypt
| | - Laila K Effat
- Centre of Excellence for Human Genetics, National Research Centre, Cairo, Egypt.,Medical Molecular Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Maha Eid
- Centre of Excellence for Human Genetics, National Research Centre, Cairo, Egypt.,Human Cytogenetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Maha S Zaki
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt.,Centre of Excellence for Human Genetics, National Research Centre, Cairo, Egypt
| | - Samia A Temtamy
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt.,Centre of Excellence for Human Genetics, National Research Centre, Cairo, Egypt
| | - Mohamed S Abdel-Hamid
- Centre of Excellence for Human Genetics, National Research Centre, Cairo, Egypt.,Medical Molecular Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
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Innes AM, McInnes BL, Dyment DA. Clinical and genetic heterogeneity in Dubowitz syndrome: Implications for diagnosis, management and further research. AMERICAN JOURNAL OF MEDICAL GENETICS PART C-SEMINARS IN MEDICAL GENETICS 2019; 178:387-397. [PMID: 30580484 DOI: 10.1002/ajmg.c.31661] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 10/14/2018] [Accepted: 10/27/2018] [Indexed: 12/12/2022]
Abstract
Dubowitz syndrome was described in 1965 as a recognizable syndrome characterized by microcephaly, short stature, eczema, mild developmental delays, and an increased risk of malignancy. Since its original description, there have been over 200 reported cases though no single gene has been identified to explain a significant proportion of affected individuals. Since the last definitive review of Dubowitz syndrome in 1996, there have been 63 individuals with a clinical, or suspected, diagnosis of Dubowitz syndrome reported in 51 publications. These individuals show a markedly wide spectrum with respect to growth, facial gestalt, psychomotor development, and risk of malignancy; genetic causes were identified in 33% (21/63). Seven individuals had deleterious copy number variants, in particular deletions at 14q32 and 17q24 were reported and showed overlap with the Dubowitz phenotype. Several cases were shown to have single gene disorders that included de novo or biallelic pathogenic variants in several genes including NSUN2 and LIG4 frequently identified by next-generation sequencing methods. It appears that the inability to identify a single gene responsible for Dubowitz syndrome reflects its extreme clinical and genetic heterogeneity. However, detailed phenotyping combined with careful grouping of subsets of unsolved cases and in conjunction with data-sharing will identify novel disease genes responsible for additional cases. In the interim, for those clinically diagnosed with a Dubowitz phenotype, we recommend assessment by a Medical Geneticist, a microarray and, if available, clinical or research based genome-wide sequencing. Management suggestions, including decisions regarding malignancy screening in select patients will be discussed.
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Affiliation(s)
- A Micheil Innes
- Department of Medical Genetics, University of Calgary, Calgary, Alberta, Canada.,Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
| | - Brenda L McInnes
- Department of Medical Genetics, University of Calgary, Calgary, Alberta, Canada
| | - David A Dyment
- Department of Genetics, Children's Hospital of Eastern Ontario, Ottawa, Ontario, Canada.,Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada
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7
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Qin C, Li J, Tang K. The Paraventricular Nucleus of the Hypothalamus: Development, Function, and Human Diseases. Endocrinology 2018; 159:3458-3472. [PMID: 30052854 DOI: 10.1210/en.2018-00453] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 07/16/2018] [Indexed: 02/08/2023]
Abstract
The paraventricular nucleus of the hypothalamus (PVH), located in the ventral diencephalon adjacent to the third ventricle, is a highly conserved brain region present in species from zebrafish to humans. The PVH is composed of three main types of neurons, magnocellular, parvocellular, and long-projecting neurons, which play imperative roles in the regulation of energy balance and various endocrinological activities. In this review, we focus mainly on recent findings about the early development of the hypothalamus and the PVH, the functions of the PVH in the modulation of energy homeostasis and in the hypothalamus-pituitary system, and human diseases associated with the PVH, such as obesity, short stature, hypertension, and diabetes insipidus. Thus, the investigations of the PVH will benefit not only understanding of the development of the central nervous system but also the etiology of and therapy for human diseases.
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Affiliation(s)
- Cheng Qin
- Queen Mary School, Medical Department, Nanchang University, Nanchang, Jiangxi, China
- Institute of Life Science, Nanchang University, Nanchang, Jiangxi, China
| | - Jiaheng Li
- Queen Mary School, Medical Department, Nanchang University, Nanchang, Jiangxi, China
- Institute of Life Science, Nanchang University, Nanchang, Jiangxi, China
| | - Ke Tang
- Institute of Life Science, Nanchang University, Nanchang, Jiangxi, China
- Precise Genome Engineering Center, School of Life Sciences, Guangzhou University, Guangzhou, Guangdong, China
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8
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Speech and language delay in a patient with WDR4 mutations. Eur J Med Genet 2018; 61:468-472. [DOI: 10.1016/j.ejmg.2018.03.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2017] [Revised: 03/21/2018] [Accepted: 03/21/2018] [Indexed: 01/02/2023]
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Imbert-Bouteille M, Mau Them FT, Thevenon J, Guignard T, Gatinois V, Riviere JB, Boland A, Meyer V, Deleuze JF, Sanchez E, Apparailly F, Geneviève D, Willems M. LARP7 variants and further delineation of the Alazami syndrome phenotypic spectrum among primordial dwarfisms: 2 sisters. Eur J Med Genet 2018; 62:161-166. [PMID: 30006060 DOI: 10.1016/j.ejmg.2018.07.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Revised: 06/20/2018] [Accepted: 07/09/2018] [Indexed: 11/18/2022]
Abstract
Alazami syndrome (AS) (MIM# 615071) is an autosomal recessive microcephalic primordial dwarfism (PD) with recognizable facial features and severe intellectual disability due to depletion or loss of function variants in LARP7. To date, 15 patients with AS have been reported. Here we describe two consanguineous Algerian sisters with Alazami PD due to LARP7 homozygous pathogenic variants detected by whole exome sequencing. By comparing these two additional cases with those previously reported, we strengthen the key features of AS: severe growth restriction, severe intellectual disability and some distinguishing facial features such as broad nose, malar hypoplasia, wide mouth, full lips and abnormally set teeth. We also report significant new findings enabling further delineation of this syndrome: disproportionately mild microcephaly, stereotypic hand wringing and severe anxiety, thickened skin over the hands and feet, and skeletal, eye and heart malformations. From previous reviews, we summarize the main etiologies of PD according to the involved mechanisms and cellular pathways, highlighting their clinical core features.
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Affiliation(s)
- Marion Imbert-Bouteille
- Département de Génétique Médicale, Maladies Rares et Médecine Personnalisée, Centre de Référence Anomalies du développement et Syndromes Malformatifs, Plateforme Recherche de Microremaniements Chromosomiques, CHU de Montpellier, Université de Montpellier, France
| | - Frédéric Tran Mau Them
- Département de Génétique Médicale, Maladies Rares et Médecine Personnalisée, Centre de Référence Anomalies du développement et Syndromes Malformatifs, Plateforme Recherche de Microremaniements Chromosomiques, CHU de Montpellier, Université de Montpellier, France; Unité Inserm, U1183, Hôpital Saint-Eloi, CHU de Montpellier, Montpellier, France; Equipe Génétique des Anomalies du Développement, INSERM UMR1231, Université de Bourgogne-Franche Comté, France; Centre de Génétique et Centre de Référence Anomalies du Développement et Syndromes Malformatifs, FHU TRANSLAD, Hôpital d'Enfants, CHU Dijon et Université de Bourgogne, France
| | - Julien Thevenon
- Equipe Génétique des Anomalies du Développement, INSERM UMR1231, Université de Bourgogne-Franche Comté, France; Centre de Génétique et Centre de Référence Anomalies du Développement et Syndromes Malformatifs, FHU TRANSLAD, Hôpital d'Enfants, CHU Dijon et Université de Bourgogne, France; Centre de Génétique, Hôpital Couple-Enfant, CHU Grenoble-Alpes, La Tronche, France
| | - Thomas Guignard
- Département de Génétique Médicale, Maladies Rares et Médecine Personnalisée, Centre de Référence Anomalies du développement et Syndromes Malformatifs, Plateforme Recherche de Microremaniements Chromosomiques, CHU de Montpellier, Université de Montpellier, France
| | - Vincent Gatinois
- Département de Génétique Médicale, Maladies Rares et Médecine Personnalisée, Centre de Référence Anomalies du développement et Syndromes Malformatifs, Plateforme Recherche de Microremaniements Chromosomiques, CHU de Montpellier, Université de Montpellier, France
| | - Jean-Baptiste Riviere
- Laboratoire de Génétique Moléculaire, Plateau Technique de Biologie - CHU Dijon, Dijon, France
| | - Anne Boland
- Centre National de Génotypage, Institut de Génomique, Commissariat à l'Energie Atomique, Evry, France
| | - Vincent Meyer
- Centre National de Génotypage, Institut de Génomique, Commissariat à l'Energie Atomique, Evry, France
| | - Jean-François Deleuze
- Centre National de Génotypage, Institut de Génomique, Commissariat à l'Energie Atomique, Evry, France
| | - Elodie Sanchez
- Département de Génétique Médicale, Maladies Rares et Médecine Personnalisée, Centre de Référence Anomalies du développement et Syndromes Malformatifs, Plateforme Recherche de Microremaniements Chromosomiques, CHU de Montpellier, Université de Montpellier, France; Unité Inserm, U1183, Hôpital Saint-Eloi, CHU de Montpellier, Montpellier, France
| | - Florence Apparailly
- Unité Inserm, U1183, Hôpital Saint-Eloi, CHU de Montpellier, Montpellier, France
| | - David Geneviève
- Département de Génétique Médicale, Maladies Rares et Médecine Personnalisée, Centre de Référence Anomalies du développement et Syndromes Malformatifs, Plateforme Recherche de Microremaniements Chromosomiques, CHU de Montpellier, Université de Montpellier, France; Unité Inserm, U1183, Hôpital Saint-Eloi, CHU de Montpellier, Montpellier, France
| | - Marjolaine Willems
- Département de Génétique Médicale, Maladies Rares et Médecine Personnalisée, Centre de Référence Anomalies du développement et Syndromes Malformatifs, Plateforme Recherche de Microremaniements Chromosomiques, CHU de Montpellier, Université de Montpellier, France; Unité Inserm, U1183, Hôpital Saint-Eloi, CHU de Montpellier, Montpellier, France.
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10
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Marakhonov AV, Konovalov FA, Makaov AK, Vasilyeva TA, Kadyshev VV, Galkina VA, Dadali EL, Kutsev SI, Zinchenko RA. Primary microcephaly case from the Karachay-Cherkess Republic poses an additional support for microcephaly and Seckel syndrome spectrum disorders. BMC Med Genomics 2018; 11:8. [PMID: 29504900 PMCID: PMC5836840 DOI: 10.1186/s12920-018-0326-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Background Primary microcephaly represents an example of clinically and genetically heterogeneous condition. Here we describe a case of primary microcephaly from the Karachay-Cherkess Republic, which was initially diagnosed with Seckel syndrome. Case presentation Clinical exome sequencing of the proband revealed a novel homozygous single nucleotide deletion in ASPM gene, c.1386delC, resulting in preterm termination codon. Population screening reveals allele frequency to be less than 0.005. Mutations in this gene were not previously associated with Seckel syndrome. Conclusions Our case represents an additional support for the clinical continuum between Seckel Syndrome and primary microcephaly.
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Affiliation(s)
- Andrey V Marakhonov
- Research Centre for Medical Genetics, Moscow, Russia. .,Moscow Institute of Physics and Technology, Dolgoprudny, Russia. .,Laboratory of Genetic Epidemiology, Research Centre for Medical Genetics, Moskvorechie St., 1, Moscow, Russian Federation, 115478.
| | | | | | | | | | | | | | - Sergey I Kutsev
- Research Centre for Medical Genetics, Moscow, Russia.,Pirogov Russian National Research Medical University, Moscow, Russia.,Moscow State University of Medicine and Dentistry, Moscow, Russia
| | - Rena A Zinchenko
- Research Centre for Medical Genetics, Moscow, Russia.,Pirogov Russian National Research Medical University, Moscow, Russia.,Moscow State University of Medicine and Dentistry, Moscow, Russia
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11
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DNA Damage as a Driver for Growth Delay: Chromosome Instability Syndromes with Intrauterine Growth Retardation. BIOMED RESEARCH INTERNATIONAL 2017; 2017:8193892. [PMID: 29238724 PMCID: PMC5702399 DOI: 10.1155/2017/8193892] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2017] [Revised: 06/16/2017] [Accepted: 07/17/2017] [Indexed: 12/20/2022]
Abstract
DNA is constantly exposed to endogenous and exogenous mutagenic stimuli that are capable of producing diverse lesions. In order to protect the integrity of the genetic material, a wide array of DNA repair systems that can target each specific lesion has evolved. Despite the availability of several repair pathways, a common general program known as the DNA damage response (DDR) is stimulated to promote lesion detection, signaling, and repair in order to maintain genetic integrity. The genes that participate in these pathways are subject to mutation; a loss in their function would result in impaired DNA repair and genomic instability. When the DDR is constitutionally altered, every cell of the organism, starting from development, will show DNA damage and subsequent genomic instability. The cellular response to this is either uncontrolled proliferation and cell cycle deregulation that ensues overgrowth, or apoptosis and senescence that result in tissue hypoplasia. These diverging growth abnormalities can clinically translate as cancer or growth retardation; both features can be found in chromosome instability syndromes (CIS). The analysis of the clinical, cellular, and molecular phenotypes of CIS with intrauterine growth retardation allows inferring that replication alteration is their unifying feature.
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12
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Abstract
PURPOSE OF THE REVIEW This review will provide an overview of the microcephalic primordial dwarfism (MPD) class of disorders and provide the reader comprehensive clinical review with suggested care guidelines for patients with microcephalic osteodysplastic primordial dwarfism, type II (MOPDII). RECENT FINDINGS Over the last 15 years, significant strides have been made in the diagnosis, natural history, and management of MOPDII. MOPDII is the most common and well described form of MPD. The classic features of the MPD group are severe pre- and postnatal growth retardation, with marked microcephaly. In addition to these features, individuals with MOPDII have characteristic facies, skeletal dysplasia, abnormal dentition, and an increased risk for cerebrovascular disease and insulin resistance. Biallelic loss-of-function mutations in the pericentrin gene cause MOPDII, which is inherited in an autosomal recessive manner.
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Affiliation(s)
- Michael B. Bober
- 0000 0001 2166 5843grid.265008.9Stanley Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA USA
- 0000 0004 0458 9676grid.239281.3A. I. DuPont Hospital for Children, 1600 Rockland-Road, Wilmington, DE 19803 USA
| | - Andrew P. Jackson
- 0000 0004 1936 7988grid.4305.2MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, EH4 2XU UK
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13
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Mutations in CIT, encoding citron rho-interacting serine/threonine kinase, cause severe primary microcephaly in humans. Hum Genet 2016; 135:1191-7. [PMID: 27503289 DOI: 10.1007/s00439-016-1722-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2016] [Accepted: 08/02/2016] [Indexed: 01/08/2023]
Abstract
Primary microcephaly is a clinical phenotype in which the head circumference is significantly reduced at birth due to abnormal brain development, primarily at the cortical level. Despite the marked genetic heterogeneity, most primary microcephaly-linked genes converge on mitosis regulation. Two consanguineous families segregating the phenotype of severe primary microcephaly, spasticity and failure to thrive had overlapping autozygomes in which exome sequencing identified homozygous splicing variants in CIT that segregate with the phenotype within each family. CIT encodes citron, an effector of the Rho signaling that is required for cytokinesis specifically in proliferating neuroprogenitors, as well as for postnatal brain development. In agreement with the critical role assigned to the kinase domain in effecting these biological roles, we show that both splicing variants predict variable disruption of this domain. The striking phenotypic overlap between CIT-mutated individuals and the knockout mice and rats that are specifically deficient in the kinase domain supports the proposed causal link between CIT mutation and primary microcephaly in humans.
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14
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Nair P, Hamzeh AR, Mohamed M, Saif F, Tawfiq N, El Halik M, Al-Ali MT, Bastaki F. Microcephalic primordial dwarfism in an Emirati patient with PNKP mutation. Am J Med Genet A 2016; 170:2127-32. [PMID: 27232581 DOI: 10.1002/ajmg.a.37766] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Accepted: 05/09/2016] [Indexed: 11/11/2022]
Abstract
Microcephaly is a rare neurological condition, both in isolation and when it occurs as part of a syndrome. One of the syndromic forms of microcephaly is microcephaly, seizures and developmental delay (MCSZ) (OMIM #613402), a rare autosomal recessive neurodevelopmental disorder with a range of phenotypic severity, and known to be caused by mutations in the polynucleotide kinase 3' phosphatase (PNKP) gene. The PNK protein is a key enzyme involved in the repair of single and double stranded DNA breaks, a process which is particularly important in the nervous system. We describe an Emirati patient who presented with microcephaly, short stature, uncontrollable tonic-clonic seizures, facial dysmorphism, and developmental delay, while at the same time showing evidence of brain atrophy and agenesis of the corpus callosum. We used whole exome sequencing to identify homozygosity for a missense c.1385G > C (p.Arg462Pro) mutation in PNKP in the patient and heterozygosity for this mutation in her consanguineous parents. The Arg 462 residue forms a part of the lid subdomain helix of the P-loop Kinase domain. Although our patient's phenotype resembled that of MCSZ, the short stature and evidence of brain atrophy distinguished it from other classic cases of the condition. The report raises the question of whether to consider this case as an atypical variant of MCSZ or as a novel form of microcephalic primordial dwarfism. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
| | | | - Madiha Mohamed
- Pediatric Department, Latifa Hospital, Dubai Health Authority, Dubai, UAE
| | - Fatima Saif
- Pediatric Department, Latifa Hospital, Dubai Health Authority, Dubai, UAE
| | - Nafisa Tawfiq
- Pediatric Department, Latifa Hospital, Dubai Health Authority, Dubai, UAE
| | - Majdi El Halik
- Pediatric Department, Latifa Hospital, Dubai Health Authority, Dubai, UAE
| | | | - Fatma Bastaki
- Pediatric Department, Latifa Hospital, Dubai Health Authority, Dubai, UAE
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15
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Shamseldin HE, Bennett AH, Alfadhel M, Gupta V, Alkuraya FS. GOLGA2, encoding a master regulator of golgi apparatus, is mutated in a patient with a neuromuscular disorder. Hum Genet 2016; 135:245-251. [PMID: 26742501 DOI: 10.1007/s00439-015-1632-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Accepted: 12/25/2015] [Indexed: 01/21/2023]
Abstract
Golgi apparatus (GA) is a membrane-bound organelle that serves a multitude of critical cellular functions including protein secretion and sorting, and cellular polarity. Many Mendelian diseases are caused by mutations in genes encoding various components of GA. GOLGA2 encodes GM130, a necessary component for the assembly of GA as a single complex, and its deficiency has been found to result in severe cellular phenotypes. We describe the first human patient with a homozygous apparently loss of function mutation in GOLGA2. The phenotype is a neuromuscular disorder characterized by developmental delay, seizures, progressive microcephaly, and muscular dystrophy. Knockdown of golga2 in zebrafish resulted in severe skeletal muscle disorganization and microcephaly recapitulating loss of function human phenotype. Our data suggest an important developmental role of GM130 in humans and zebrafish.
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Affiliation(s)
- Hanan E Shamseldin
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Alexis H Bennett
- Division of Genetics, Brigham and Women's Hospital and Department of Genetics, Children's Hospital Boston, Harvard Medical School, Boston, MA, USA
| | - Majid Alfadhel
- Genetics Division, Department of Pediatrics, King Saud bin Abdulaziz University for Health Science, King Abdulaziz Medical City, Riyadh, Saudi Arabia
| | - Vandana Gupta
- Division of Genetics, Brigham and Women's Hospital and Department of Genetics, Children's Hospital Boston, Harvard Medical School, Boston, MA, USA
| | - Fowzan S Alkuraya
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
- Department of Anatomy and Cell Biology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
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16
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Shamseldin H, Alazami A, Manning M, Hashem A, Caluseiu O, Tabarki B, Esplin E, Schelley S, Innes A, Parboosingh J, Lamont R, Majewski J, Bernier F, Alkuraya F, Alkuraya FS. RTTN Mutations Cause Primary Microcephaly and Primordial Dwarfism in Humans. Am J Hum Genet 2015; 97:862-8. [PMID: 26608784 DOI: 10.1016/j.ajhg.2015.10.012] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2015] [Accepted: 10/20/2015] [Indexed: 10/22/2022] Open
Abstract
Primary microcephaly is a developmental brain anomaly that results from defective proliferation of neuroprogenitors in the germinal periventricular zone. More than a dozen genes are known to be mutated in autosomal-recessive primary microcephaly in isolation or in association with a more generalized growth deficiency (microcephalic primordial dwarfism), but the genetic heterogeneity is probably more extensive. In a research protocol involving autozygome mapping and exome sequencing, we recruited a multiplex consanguineous family who is affected by severe microcephalic primordial dwarfism and tested negative on clinical exome sequencing. Two candidate autozygous intervals were identified, and the second round of exome sequencing revealed a single intronic variant therein (c.2885+8A>G [p.Ser963(∗)] in RTTN exon 23). RT-PCR confirmed that this change creates a cryptic splice donor and thus causes retention of the intervening 7 bp of the intron and leads to premature truncation. On the basis of this finding, we reanalyzed the exome file of a second consanguineous family affected by a similar phenotype and identified another homozygous change in RTTN as the likely causal mutation. Combined linkage analysis of the two families confirmed that RTTN maps to the only significant linkage peak. Finally, through international collaboration, a Canadian multiplex family affected by microcephalic primordial dwarfism and biallelic mutation of RTTN was identified. Our results expand the phenotype of RTTN-related disorders, hitherto limited to polymicrogyria, to include microcephalic primordial dwarfism with a complex brain phenotype involving simplified gyration.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | - Fowzan S Alkuraya
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh 11211, Saudi Arabia; Department of Anatomy and Cell Biology, College of Medicine, Alfaisal University, Riyadh 11533, Saudi Arabia.
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17
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Shaheen R, Abdel-Salam GMH, Guy MP, Alomar R, Abdel-Hamid MS, Afifi HH, Ismail SI, Emam BA, Phizicky EM, Alkuraya FS. Mutation in WDR4 impairs tRNA m(7)G46 methylation and causes a distinct form of microcephalic primordial dwarfism. Genome Biol 2015; 16:210. [PMID: 26416026 PMCID: PMC4587777 DOI: 10.1186/s13059-015-0779-x] [Citation(s) in RCA: 114] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 09/14/2015] [Indexed: 04/13/2023] Open
Abstract
Background Primordial dwarfism is a state of extreme prenatal and postnatal growth deficiency, and is characterized by marked clinical and genetic heterogeneity. Results Two presumably unrelated consanguineous families presented with an apparently novel form of primordial dwarfism in which severe growth deficiency is accompanied by distinct facial dysmorphism, brain malformation (microcephaly, agenesis of corpus callosum, and simplified gyration), and severe encephalopathy with seizures. Combined autozygome/exome analysis revealed a novel missense mutation in WDR4 as the likely causal variant. WDR4 is the human ortholog of the yeast Trm82, an essential component of the Trm8/Trm82 holoenzyme that effects a highly conserved and specific (m7G46) methylation of tRNA. The human mutation and the corresponding yeast mutation result in a significant reduction of m7G46 methylation of specific tRNA species, which provides a potential mechanism for primordial dwarfism associated with this lesion, since reduced m7G46 modification causes a growth deficiency phenotype in yeast. Conclusion Our study expands the number of biological pathways underlying primordial dwarfism and adds to a growing list of human diseases linked to abnormal tRNA modification. Electronic supplementary material The online version of this article (doi:10.1186/s13059-015-0779-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Ranad Shaheen
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Ghada M H Abdel-Salam
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Michael P Guy
- Department of Biochemistry and Biophysics, Center for RNA Biology, University of Rochester School of Medicine and Dentistry, Rochester, NY, USA.,Current address: Department of Chemistry, Northern Kentucky University, Highland Heights, KY, USA
| | - Rana Alomar
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Mohamed S Abdel-Hamid
- Medical Molecular Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Hanan H Afifi
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Samira I Ismail
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Bayoumi A Emam
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Eric M Phizicky
- Department of Biochemistry and Biophysics, Center for RNA Biology, University of Rochester School of Medicine and Dentistry, Rochester, NY, USA.
| | - Fowzan S Alkuraya
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia. .,Department of Anatomy and Cell Biology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia.
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18
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Barraza-García J, Iván Rivera-Pedroza C, Salamanca L, Belinchón A, López-González V, Sentchordi-Montané L, del Pozo Á, Santos-Simarro F, Campos-Barros Á, Lapunzina P, Guillén-Navarro E, González-Casado I, García-Miñaur S, Heath KE. Two novelPOC1Amutations in the primordial dwarfism, SOFT syndrome: Clinical homogeneity but also unreported malformations. Am J Med Genet A 2015; 170A:210-6. [DOI: 10.1002/ajmg.a.37393] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 09/07/2015] [Indexed: 11/10/2022]
Affiliation(s)
- Jimena Barraza-García
- Institute of Medical & Molecular Genetics (INGEMM); Hospital Universitario La Paz; Universidad Autónoma de Madrid; IdiPAZ Madrid Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER); Instituto Carlos III; Madrid Spain
- Multidisciplinary Skeletal Dysplasia Unit (UMDE); Hospital Universitario La Paz; Madrid Spain
| | - Carlos Iván Rivera-Pedroza
- Institute of Medical & Molecular Genetics (INGEMM); Hospital Universitario La Paz; Universidad Autónoma de Madrid; IdiPAZ Madrid Spain
- Multidisciplinary Skeletal Dysplasia Unit (UMDE); Hospital Universitario La Paz; Madrid Spain
| | - Luis Salamanca
- Department of Pediatric Endocrinology; Hospital Universitario La Paz; Universidad Autónoma de Madrid; Spain
| | - Alberta Belinchón
- Institute of Medical & Molecular Genetics (INGEMM); Hospital Universitario La Paz; Universidad Autónoma de Madrid; IdiPAZ Madrid Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER); Instituto Carlos III; Madrid Spain
- Multidisciplinary Skeletal Dysplasia Unit (UMDE); Hospital Universitario La Paz; Madrid Spain
| | - Vanesa López-González
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER); Instituto Carlos III; Madrid Spain
- Department of Pediatrics; Medical Genetics Section; Hospital Clínico Universitario Virgen de la Arrixaca; IMIB-Arrixaca; Murcia Spain
| | - Lucía Sentchordi-Montané
- Institute of Medical & Molecular Genetics (INGEMM); Hospital Universitario La Paz; Universidad Autónoma de Madrid; IdiPAZ Madrid Spain
- Multidisciplinary Skeletal Dysplasia Unit (UMDE); Hospital Universitario La Paz; Madrid Spain
- Department of Pediatric Endocrinology; Hospital Universitario Infanta Leonor; Madrid Spain
| | - Ángela del Pozo
- Institute of Medical & Molecular Genetics (INGEMM); Hospital Universitario La Paz; Universidad Autónoma de Madrid; IdiPAZ Madrid Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER); Instituto Carlos III; Madrid Spain
| | - Fernando Santos-Simarro
- Institute of Medical & Molecular Genetics (INGEMM); Hospital Universitario La Paz; Universidad Autónoma de Madrid; IdiPAZ Madrid Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER); Instituto Carlos III; Madrid Spain
- Multidisciplinary Skeletal Dysplasia Unit (UMDE); Hospital Universitario La Paz; Madrid Spain
| | - Ángel Campos-Barros
- Institute of Medical & Molecular Genetics (INGEMM); Hospital Universitario La Paz; Universidad Autónoma de Madrid; IdiPAZ Madrid Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER); Instituto Carlos III; Madrid Spain
| | - Pablo Lapunzina
- Institute of Medical & Molecular Genetics (INGEMM); Hospital Universitario La Paz; Universidad Autónoma de Madrid; IdiPAZ Madrid Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER); Instituto Carlos III; Madrid Spain
- Multidisciplinary Skeletal Dysplasia Unit (UMDE); Hospital Universitario La Paz; Madrid Spain
| | - Encarna Guillén-Navarro
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER); Instituto Carlos III; Madrid Spain
- Department of Pediatrics; Medical Genetics Section; Hospital Clínico Universitario Virgen de la Arrixaca; IMIB-Arrixaca; Murcia Spain
- Cátedra de Genética Médica; UCAM-Universidad Católica San Antonio de Murcia; Spain
| | - Isabel González-Casado
- Multidisciplinary Skeletal Dysplasia Unit (UMDE); Hospital Universitario La Paz; Madrid Spain
- Department of Pediatric Endocrinology; Hospital Universitario La Paz; Universidad Autónoma de Madrid; Spain
| | - Sixto García-Miñaur
- Institute of Medical & Molecular Genetics (INGEMM); Hospital Universitario La Paz; Universidad Autónoma de Madrid; IdiPAZ Madrid Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER); Instituto Carlos III; Madrid Spain
- Multidisciplinary Skeletal Dysplasia Unit (UMDE); Hospital Universitario La Paz; Madrid Spain
| | - Karen E. Heath
- Institute of Medical & Molecular Genetics (INGEMM); Hospital Universitario La Paz; Universidad Autónoma de Madrid; IdiPAZ Madrid Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER); Instituto Carlos III; Madrid Spain
- Multidisciplinary Skeletal Dysplasia Unit (UMDE); Hospital Universitario La Paz; Madrid Spain
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19
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Shaheen R, Almoisheer A, Faqeih E, Babay Z, Monies D, Tassan N, Abouelhoda M, Kurdi W, Al Mardawi E, Khalil MMI, Seidahmed MZ, Alnemer M, Alsahan N, Sogaty S, Alhashem A, Singh A, Goyal M, Kapoor S, Alomar R, Ibrahim N, Alkuraya FS. Identification of a novel MKS locus defined by TMEM107 mutation. Hum Mol Genet 2015; 24:5211-8. [PMID: 26123494 DOI: 10.1093/hmg/ddv242] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Accepted: 06/22/2015] [Indexed: 12/12/2022] Open
Abstract
Meckel-Gruber syndrome (MKS) is a perinatally lethal disorder characterized by the triad of occipital encephalocele, polydactyly and polycystic kidneys. Typical of other disorders related to defective primary cilium (ciliopathies), MKS is genetically heterogeneous with mutations in a dozen genes to date known to cause the disease. In an ongoing effort to characterize MKS clinically and genetically, we implemented a gene panel and next-generation sequencing approach to identify the causal mutation in 25 MKS families. Of the three families that did not harbor an identifiable causal mutation by this approach, two mapped to a novel disease locus in which whole-exome sequencing revealed the likely causal mutation as a homozygous splicing variant in TMEM107, which we confirm leads to aberrant splicing and nonsense-mediated decay. TMEM107 had been independently identified in two mouse models as a cilia-related protein and mutant mice display typical ciliopathy phenotypes. Our analysis of patient fibroblasts shows marked ciliogenesis defect with an accompanying perturbation of sonic hedgehog signaling, highly concordant with the cellular phenotype in Tmem107 mutants. This study shows that known MKS loci account for the overwhelming majority of MKS cases but additional loci exist including MKS13 caused by TMEM107 mutation.
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Affiliation(s)
| | | | - Eissa Faqeih
- Department of Pediatric Subspecialty, Children's Specialized Hospital, King Fahad Medical City, Riyadh 59046, Saudi Arabia
| | - Zainab Babay
- Depatment of Obstetrics and Gynecology, King Khalid University Hospital and College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Dorota Monies
- Department of Genetics and Saudi Human Genome Program, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia
| | - Nada Tassan
- Department of Genetics and Saudi Human Genome Program, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia
| | - Mohamed Abouelhoda
- Department of Genetics and Saudi Human Genome Program, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia
| | - Wesam Kurdi
- Department of Obstetrics and Gynecology, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | | | - Mohamed M I Khalil
- Department of Obstetrics and Gynecology and Department of Obstetrics and Gynecology, Menoufiya University, Menoufiya, Egypt
| | | | - Maha Alnemer
- Department of Obstetrics and Gynecology, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Nada Alsahan
- Department of Obstetrics and Gynecology, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Samira Sogaty
- Department of Medical Genetics, King Fahad General Hospital, Jeddah, Saudi Arabia
| | - Amal Alhashem
- Department of Pediatrics, Prince Sultan Military Medical City, Riyadh 11159, Saudi Arabia
| | - Ankur Singh
- Department of Pediatrics, Institute of Medical Sciences, Banaras Hindu University, Varanasi, UP, India
| | - Manisha Goyal
- Department of Pediatrics, Institute of Medical Sciences, Banaras Hindu University, Varanasi, UP, India
| | - Seema Kapoor
- Department of Pediatrics Genetic & Research Laboratory, Maulana Azad Medical College, New Delhi, India and
| | | | | | - Fowzan S Alkuraya
- Department of Genetics and Saudi Human Genome Program, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia, Department of Anatomy and Cell Biology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
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