1
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Sun X, Wang T. Research progress on the pathogenesis of CDKL5 pathogenic variants and related encephalopathy. Eur J Pediatr 2023:10.1007/s00431-023-05006-z. [PMID: 37166538 DOI: 10.1007/s00431-023-05006-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 04/26/2023] [Accepted: 04/27/2023] [Indexed: 05/12/2023]
Abstract
Cyclin-dependent kinase-like 5 (CDKL5) is a gene encoding a serine/threonine kinase that possesses an N-terminal catalytic domain and a large C-terminal domain and is located on the short arm of the X-chromosome at position 22 (Xp22). CDKL5 regulates neuronal migration, axonal growth, dendritic morphogenesis, and synaptic development and affects synaptic function. Pathogenic variants include deletions, truncations, splice variants, and missense variants. The specificity of CDKL5 is mainly determined by the shared sequence of amino acid residues, which is the phosphorylation site of the target protein with the motif Arg-Pro-X-Ser/Thr-Ala/Pro/Gly/Ser (R-P-X-[S/T]-[A/G/P/S]). Developmental encephalopathy caused by pathogenic variants of CDKL5 has a variety of nervous system symptoms, such as epilepsy, hypotonia, growth retardation, dyskinesia, cortical visual impairment, sleep disorders, and other clinical symptoms. This review summarizes the mechanism of CDKL5-induced allogeneic lesions in the nervous system and the clinical manifestations of related encephalopathy. Conclusion: This review clarifies CDKL5's participation in neurodevelopmental diseases as well as its crucial function in dividing cells, cultured neurons, knockout mice, and human iPSC-derived neurons. CDKL5 variants help identify clinical diagnostic biomarkers. Although a few direct substrates of CDKL5 have been identified, more must be found in order to fully comprehend the signaling pathways connected to CDKL5 in the brain and the mechanisms that underlie its activities.
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Affiliation(s)
- Xuyan Sun
- Department of Neurology, Lanzhou University Second Hospital, Lanzhou, 730000, China
| | - Tiancheng Wang
- Department of Neurology, Lanzhou University Second Hospital, Lanzhou, 730000, China.
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2
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Lei L, Xiaobo L, Zhiqiang L, Yongzhi X, Shunxiang H, Huadong Z, Beisha T, Ruxu Z. Genotype-phenotype characteristics and baseline natural history of Chinese myelin protein zero gene related neuropathy patients. Eur J Neurol 2023; 30:1069-1079. [PMID: 36692866 DOI: 10.1111/ene.15700] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 12/24/2022] [Accepted: 12/30/2022] [Indexed: 01/25/2023]
Abstract
BACKGROUND AND PURPOSE The aim was to characterize the phenotypic and genotypic features of myelin protein zero (MPZ) related neuropathy and provide baseline data for longitudinal natural history studies or drug clinical trials. METHOD Clinical, neurophysiological and genetic data of 37 neuropathy patients with MPZ mutations were retrospectively collected. RESULTS Nineteen different MPZ mutations in 23 unrelated neuropathy families were detected, and the frequency of MPZ mutations was 5.84% in total. Mutations c.103_104InsTGGTTTACACCG, c.513dupG, c.521_557del and c.696_699delCAGT had not been reported previously. Hot spot mutation p.Thr124Met was detected in four unrelated families, and seven patients carried de novo mutations. The onset age indicated a bimodal distribution: prominent clustering in the first and fourth decades. The infantile-onset group included 12 families, the childhood-onset group consisted of two families and the adult-onset group included nine families. The Charcot-Marie-Tooth Disease Neuropathy Score ranged from 3 to 25 with a mean value of 15.85 ± 5.88. Mutations that changed the cysteine residue (p.Arg98Cys, p.Cys127Trp, p.Ser140Cys and p.Cys127Arg) in the extracellular region were more likely to cause severe early-onset Charcot-Marie-Tooth disease type 1B (CMT1B) or Dejerine-Sottas syndrome. Nonsense-mediated mRNA decay mutations p.Asp35delInsVVYTD, p.Leu174Argfs*66 and p.Leu172Alafs*63 were related to severe infantile-onset CMT1B or Dejerine-Sottas syndrome; however, mutation p.Val232Valfs*19 was associated with a relatively milder childhood-onset CMT1 phenotype. CONCLUSION Four novel MPZ mutations are reported that expand the genetic spectrum. De novo mutations accounted for 30.4% and were most related to a severe infantile-onset phenotype. Genetic and clinical data from this cohort will provide the baseline data necessary for clinical trials and natural history studies.
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Affiliation(s)
- Liu Lei
- Health Management Center, Third Xiangya Hospital, Central South University, Changsha, China
| | - Li Xiaobo
- Department of Neurology, Third Xiangya Hospital, Central South University, Changsha, China
| | - Lin Zhiqiang
- Department of Neurology, Third Xiangya Hospital, Central South University, Changsha, China
| | - Xie Yongzhi
- Department of Neurology, Third Xiangya Hospital, Central South University, Changsha, China
| | - Huang Shunxiang
- Department of Neurology, Third Xiangya Hospital, Central South University, Changsha, China
| | - Zhao Huadong
- Department of Neurology, Third Xiangya Hospital, Central South University, Changsha, China
| | - Tang Beisha
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Zhang Ruxu
- Department of Neurology, Third Xiangya Hospital, Central South University, Changsha, China
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3
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Eker D, Gurkan H, Karal Y, Yalcintepe S, Demir S, Atli E, Karasalihoglu ST. Investigating the Genetic Etiology of Pediatric Patients with Peripheral Hypotonia Using the Next-Generation Sequencing Method. Glob Med Genet 2022; 9:200-207. [PMID: 35846108 PMCID: PMC9286875 DOI: 10.1055/s-0042-1745873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Background
Hypotonia occurs as a result of neurological dysfunction in the brain, brainstem, spinal cord, motor neurons, anterior horn cells, peripheral nerves, and muscles. Although the genotype–phenotype correlation can be established in 15 to 30% of patients, it is difficult to obtain a correlation in most cases.
Aims
This study was aimed to investigate the genetic etiology in cases of peripheral hypotonia that could not be diagnosed using conventional methods.
Methods
A total of 18 pediatric patients with peripheral hypotonia were included. They were referred to our genetic disorders diagnosis center from the Pediatric Neurology Department with a prediagnosis of hypotonia. A custom designed multigene panel, including
ACTA1
,
CCDC78
,
DYNC1H1
,
GARS
,
RYR1
,
COL6A1
,
COL6A2
,
COL6A3
,
FKRP
,
FKTN
,
IGHMBP2
,
LMNA
,
LAMA2
,
LARGE1
,
MTM1
,
NEM
,
POMGnT1
,
POMT1
,
POMT2
, and
SEPN1
, was used for genetic analysis using next-generation sequencing (NGS).
Results
In our study, we found 13 variants including pathogenic (two variants in LAMA2) and likely pathogenic variants (three variants in RYR1 and POMGnT1) and variants of uncertain clinical significance (eight variants in RYR1, COL6A3, COL6A2, POMGnT1 and POMT1) in 11 (61%) out of 18 patients. In one of our patients, a homozygous, likely pathogenic c.1649G > A, p.(Ser550Asn) variant was defined in the
POMGnT1
gene which was associated with a muscle–eye–brain disease phenotype.
Conclusion
The contribution of an in-house designed gene panel in the etiology of peripheral hypotonia with a clinical diagnosis was 5.5%. An important contribution with the clinical diagnosis can be made using the targeted multigene panels in larger samples.
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Affiliation(s)
- Damla Eker
- Department of Medical Genetics, Faculty of Medicine, Trakya University, Edirne, Turkey
| | - Hakan Gurkan
- Department of Medical Genetics, Faculty of Medicine, Trakya University, Edirne, Turkey
| | - Yasemin Karal
- Department of Pediatric Neurology, Faculty of Medicine, Trakya University, Edirne, Turkey
| | - Sinem Yalcintepe
- Department of Medical Genetics, Faculty of Medicine, Trakya University, Edirne, Turkey
| | - Selma Demir
- Department of Medical Genetics, Faculty of Medicine, Trakya University, Edirne, Turkey
| | - Engin Atli
- Department of Medical Genetics, Faculty of Medicine, Trakya University, Edirne, Turkey
| | - Serap T. Karasalihoglu
- Department of Pediatric Neurology, Faculty of Medicine, Trakya University, Edirne, Turkey
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4
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Diagnostic yield of multi-gene panel for muscular dystrophies and other hereditary myopathies. Neurol Sci 2022; 43:4473-4481. [PMID: 35175440 DOI: 10.1007/s10072-022-05934-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Accepted: 02/03/2022] [Indexed: 12/14/2022]
Abstract
Genetic testing is being considered the first-step in the investigation of hereditary myopathies. However, the performance of the different testing approaches is little known. The aims of the present study were to evaluate the diagnostic yield of a next-generation sequencing panel comprising 39 genes as the first-tier test for genetic myopathies diagnosis and to characterize clinical and molecular findings of families from southern Brazil. Fifty-one consecutive index cases with clinical suspicion of genetic myopathies were recruited from October 2014 to March 2018 in a cross-sectional study. The overall diagnostic yield of the next-generation sequencing panel was 52.9%, increasing to 60.8% when including cases with candidate variants. Multi-gene panel solved the diagnosis of 12/25 (48%) probands with limb-girdle muscular dystrophies, of 7/14 (50%) with congenital muscular diseases, and of 7/10 (70%) with muscular dystrophy with prominent joint contractures. The most frequent diagnosis for limb-girdle muscular dystrophies were LGMD2A/LGMD-R1-calpain3-related and LGMD2B/LGMD-R2-dysferlin-related; for congenital muscular diseases, RYR1-related-disorders; and for muscular dystrophy with prominent joint contractures, Emery-Dreifuss-muscular-dystrophy-type-1 and COL6A1-related-disorders. In summary, the customized next-generation sequencing panel when applied in the initial investigation of genetic myopathies results in high diagnostic yield, likely reducing patient's diagnostic odyssey and providing important information for genetic counseling and participation in disease-specific clinical trials.
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5
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Chen B, Zhang Z, Chen N, Li W, Pan H, Wang X, Ren Y, Shi Y, Tai H, Niu S. Two Novel Myelin Protein Zero Mutations in a Group of Chinese Patients. Front Neurol 2021; 12:734515. [PMID: 34925207 PMCID: PMC8674198 DOI: 10.3389/fneur.2021.734515] [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: 07/01/2021] [Accepted: 11/01/2021] [Indexed: 11/13/2022] Open
Abstract
Mutations in the myelin protein zero gene are responsible for the autosomal dominant Charcot-Marie-Tooth disease (CMT). We summarized the genetic and clinical features of six unrelated Chinese families and the genetic spectrum of Chinese patients with myelin protein zero (MPZ) mutations. Our study reports data from a group of Chinese patients consisting of five males and one female with the age of disease onset ranging from 16 to 55 years. The initial symptom in all the patients was the weakness of the lower limbs. Electrophysiological presentations suggested chronic progressive sensorimotor demyelinating polyneuropathy. Overall six mutations were identified in the cohort, including four known mutations [c.103G>T (p.D35Y), c.233C>T (p.S78L), c.293G>A (p.R98H), and c.449-1G>T], and two novel mutations [c.67+4A>G with a mild CMT1B phenotype, and (c.79delG) p.A27fs with a rapidly progressive CMT1B phenotype]. According to the literature review, there are 35 Chinese families with 28 different MPZ mutations. The MPZ mutational spectrum in Chinese patients is very heterogeneous and differs from that of Japanese and Korean individuals, although they do share several common hot spot mutations.
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Affiliation(s)
- Bin Chen
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.,China National Clinical Research Center for Neurological Diseases, Beijing, China
| | - Zaiqiang Zhang
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.,China National Clinical Research Center for Neurological Diseases, Beijing, China
| | - Na Chen
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.,China National Clinical Research Center for Neurological Diseases, Beijing, China
| | - Wei Li
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.,China National Clinical Research Center for Neurological Diseases, Beijing, China.,Monogenic Disease Diagnosis Center for Neurological Disorders, Precision Medicine Research Center for Neurological Disorders, Beijing, China
| | - Hua Pan
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.,China National Clinical Research Center for Neurological Diseases, Beijing, China
| | - Xingao Wang
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.,China National Clinical Research Center for Neurological Diseases, Beijing, China
| | - Yuting Ren
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.,China National Clinical Research Center for Neurological Diseases, Beijing, China
| | - Yuzhi Shi
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.,China National Clinical Research Center for Neurological Diseases, Beijing, China
| | - Hongfei Tai
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.,China National Clinical Research Center for Neurological Diseases, Beijing, China
| | - Songtao Niu
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.,China National Clinical Research Center for Neurological Diseases, Beijing, China
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6
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Sharma S, Repnikova E, Noel-MacDonnell JR, LePichon JB. Diagnostic yield of genetic testing in 324 infants with hypotonia. Clin Genet 2021; 100:752-757. [PMID: 34480364 PMCID: PMC9291145 DOI: 10.1111/cge.14057] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 08/12/2021] [Accepted: 08/31/2021] [Indexed: 11/05/2022]
Abstract
This retrospective cohort study was designed to determine the yield of genetic tests in hypotonic infants and develop a diagnostic algorithm. Out of 496 patients identified by International Classification of Diseases (ICD) 9/10 coding, 324 patients met the inclusion criteria. Diagnostic yields were 32% for karyotype, 19% for microarray, 30% for targeted genetic tests, 38% for gene panels, and 31% for exome sequencing. In addition, we considered the diagnostic contribution of ancillary tests, including neuroimaging, metabolic tests, and so forth. The combination of microarray and exome sequencing gave the highest diagnostic yield. None of the other tests added significant value in arriving at a diagnosis. Based on these results we propose that the vast majority of infants with congenital hypotonia should start with a microarray and proceed with exome sequencing, with the notable exception of infants with clearly syndromic features in whom karyotyping or targeted testing may be more appropriate.
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Affiliation(s)
- Sonal Sharma
- Division of Neurology, Children's Mercy Hospital, Kansas City, Missouri, USA.,Mitochondrial Medicine Frontier Program, Children's Hospital of Philadelphia, 3401 Civic Center Boulevard, Philadelphia 19104, Pennsylvania, USA
| | - Elena Repnikova
- Department of Pathology and Laboratory Medicine, Cytogenetics and Molecular Genetics Laboratories, Children's Mercy Hospital, Kansas City, Missouri, USA.,UMKC School of Medicine, Kansas City, Missouri, USA
| | - Janelle R Noel-MacDonnell
- UMKC School of Medicine, Kansas City, Missouri, USA.,Department of Health Services and Outcomes Research, Children's Mercy Hospital, Kansas City, Missouri, USA
| | - Jean-Baptiste LePichon
- Division of Neurology, Children's Mercy Hospital, Kansas City, Missouri, USA.,UMKC School of Medicine, Kansas City, Missouri, USA
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7
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Fridman H, Bormans C, Einhorn M, Au D, Bormans A, Porat Y, Sanchez LF, Manning B, Levy-Lahad E, Behar DM. Performance comparison: exome sequencing as a single test replacing Sanger sequencing. Mol Genet Genomics 2021; 296:653-663. [PMID: 33694043 DOI: 10.1007/s00438-021-01772-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 03/02/2021] [Indexed: 01/23/2023]
Abstract
Next generation sequencing tests are used routinely as first-choice tests in the clinic. However, systematic performance comparing the results of exome sequencing as a single test replacing Sanger sequencing of targeted gene(s) is still lacking. Performance comparison data are critically important for clinical case management. In this study, we compared Sanger-sequencing results of 258 genes to those obtained from next generation sequencing (NGS) using two exome-sequencing enrichment kits: Agilent-SureSelectQXT and Illumina-Nextera. Sequencing was performed on leukocytes and buccal-derived DNA from a single individual, and all 258 genes were sequenced a total of 11 times (using different sequencing methods and DNA sources). Sanger sequencing was completed for all exons, including flanking ± 8 bp regions. For the 258 genes, NGS mean coverage was > 20 × for > 98 and > 91% of the regions targeted by SureSelect and Nextera, respectively. Overall, 449 variants were identified in at least one experiment, and 407/449 (90.6%) were detected by all. Of the 42 discordant variants, 23 were determined as true calls, summing-up to a truth set of 430 variants. Sensitivity of true-variant detection was 99% for Sanger sequencing and 97-100% for the NGS experiments. Mean false-positive rates were 3.7E-6 for Sanger sequencing, 2.5E-6 for SureSelect-NGS and 5.2E-6 for Nextera-NGS. Our findings suggest a high overall concordance between Sanger sequencing and NGS performances. Both methods demonstrated false-positive and false-negative calls. High clinical suspicion for a specific diagnosis should, therefore, override negative results of either Sanger sequencing or NGS.
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Affiliation(s)
- Hila Fridman
- Medical Genetics Institute, Shaare Zedek Medical Center, 91031, Jerusalem, Israel. .,Faculty of Medicine, The Hebrew University of Jerusalem, 91120, Jerusalem, Israel.
| | | | - Moshe Einhorn
- Data Analysis Group, 6688218, Genoox, Tel Aviv, Israel
| | - Daniel Au
- Genomic Research Center, Gene By Gene, Houston, TX, 77008, USA
| | - Arjan Bormans
- Genomic Research Center, Gene By Gene, Houston, TX, 77008, USA
| | - Yuval Porat
- Data Analysis Group, 6688218, Genoox, Tel Aviv, Israel
| | | | - Brent Manning
- Genomic Research Center, Gene By Gene, Houston, TX, 77008, USA
| | - Ephrat Levy-Lahad
- Medical Genetics Institute, Shaare Zedek Medical Center, 91031, Jerusalem, Israel.,Faculty of Medicine, The Hebrew University of Jerusalem, 91120, Jerusalem, Israel
| | - Doron M Behar
- Genomic Research Center, Gene By Gene, Houston, TX, 77008, USA
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8
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Isackson PJ, Wang J, Zia M, Spurgeon P, Levesque A, Bard J, James S, Nowak N, Lee TK, Vladutiu GD. RYR1 and CACNA1S genetic variants identified with statin-associated muscle symptoms. Pharmacogenomics 2018; 19:1235-1249. [PMID: 30325262 DOI: 10.2217/pgs-2018-0106] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AIM To examine the genetic differences between subjects with statin-associated muscle symptoms and statin-tolerant controls. MATERIALS & METHODS Next-generation sequencing was used to characterize the exomes of 76 subjects with severe statin-associated muscle symptoms and 50 statin-tolerant controls. RESULTS 12 probably pathogenic variants were found within the RYR1 and CACNA1S genes in 16% of cases with severe statin-induced myopathy representing a fourfold increase over variants found in statin-tolerant controls. Subjects with probably pathogenic RYR1 or CACNA1S variants had plasma CK 5X to more than 400X the upper limit of normal in addition to having muscle symptoms. CONCLUSIONS Genetic variants within the RYR1 and CACNA1S genes are likely to be a major contributor to the susceptibility to statin-associated muscle symptoms.
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Affiliation(s)
- Paul J Isackson
- Department of Pediatrics, State University of New York at Buffalo, NY 14203, USA
| | - Jianxin Wang
- Center for Computational Research, State University of New York at Buffalo, NY 14203, USA
| | - Mohammad Zia
- Center for Computational Research, State University of New York at Buffalo, NY 14203, USA
| | - Paul Spurgeon
- Center for Computational Research, State University of New York at Buffalo, NY 14203, USA
| | - Adrian Levesque
- Center for Computational Research, State University of New York at Buffalo, NY 14203, USA
| | - Jonathan Bard
- Center for Computational Research, State University of New York at Buffalo, NY 14203, USA
| | - Smitha James
- New York State Center of Excellence in Bioinformatics & Life Sciences, State University of New York at Buffalo, Buffalo, NY 14203, USA
| | - Norma Nowak
- New York State Center of Excellence in Bioinformatics & Life Sciences, State University of New York at Buffalo, Buffalo, NY 14203, USA.,Department of Biochemistry, Jacobs School of Medicine & Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY 14203, USA
| | - Tae Keun Lee
- Department of Pediatrics, State University of New York at Buffalo, NY 14203, USA
| | - Georgirene D Vladutiu
- Department of Pediatrics, State University of New York at Buffalo, NY 14203, USA.,Departments of Neurology & Pathology & Anatomical Sciences, University at Buffalo, Buffalo, NY 14214, USA
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9
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Qin L, Lou G, Guo L, Zhang Y, Wang H, Wang L, Hou Q, Liu H, Li X, Liao S. Targeted next-generation sequencing-based molecular diagnosis of congenital hand malformations in Chinese population. Sci Rep 2018; 8:12721. [PMID: 30143665 PMCID: PMC6109141 DOI: 10.1038/s41598-018-30940-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 08/04/2018] [Indexed: 01/01/2023] Open
Abstract
Congenital hand malformations is rare and characterized by hand deformities. It is highly heterogeneous, both clinically and genetically, which complicates the identification of causative genes and mutations. Recently, targeted next-generation (NGS) sequencing has been successfully used for the detection of heterogeneous diseases, and the use of NGS also has contributed significantly in evaluating the etiology of heterogeneous disease. Here, we employed targeted NGS to screen 248 genes involved in genetic skeletal disorders, including congenital hand malformations. Three pathogenic mutations located in the GJA1, ROR2 and TBX5 genes were detected in three large Chinese families with congenital hand malformations. Two novel mutations were reported, and a known causative mutation was verified in this Chinese population. This is also the first report that the same panel of targeted NGS was employed to perform molecular diagnosis of different subtypes of congenital hand malformations. Our study supported the application of a targeted NGS panel as an effective tool to detect the genetic cause for heterogeneous diseases in clinical diagnosis.
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Affiliation(s)
- Litao Qin
- Medical Genetic Institute of Henan Province, Henan Provincial Key Laboratory of Genetic Diseases and Functional Genomics, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Guiyu Lou
- Medical Genetic Institute of Henan Province, Henan Provincial Key Laboratory of Genetic Diseases and Functional Genomics, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Liangjie Guo
- Medical Genetic Institute of Henan Province, Henan Provincial Key Laboratory of Genetic Diseases and Functional Genomics, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Yuwei Zhang
- Medical Genetic Institute of Henan Province, Henan Provincial Key Laboratory of Genetic Diseases and Functional Genomics, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Hongdan Wang
- Medical Genetic Institute of Henan Province, Henan Provincial Key Laboratory of Genetic Diseases and Functional Genomics, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Li Wang
- Medical Genetic Institute of Henan Province, Henan Provincial Key Laboratory of Genetic Diseases and Functional Genomics, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Qiaofang Hou
- Medical Genetic Institute of Henan Province, Henan Provincial Key Laboratory of Genetic Diseases and Functional Genomics, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Hongyan Liu
- Medical Genetic Institute of Henan Province, Henan Provincial Key Laboratory of Genetic Diseases and Functional Genomics, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Xichuan Li
- Department of Immunology, Tianjin Medical University, Tianjin, China.
| | - Shixiu Liao
- Medical Genetic Institute of Henan Province, Henan Provincial Key Laboratory of Genetic Diseases and Functional Genomics, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, Zhengzhou, Henan, China.
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10
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SHAKIBA M, KERAMATIPOUR M. Effect of Whole Exome Sequencing in Diagnosis of Inborn Errors of Metabolism and Neurogenetic Disorders. IRANIAN JOURNAL OF CHILD NEUROLOGY 2018; 12:7-15. [PMID: 29379558 PMCID: PMC5760669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 12/05/2017] [Accepted: 12/12/2017] [Indexed: 10/31/2022]
Abstract
OBJECTIVE Inborn errors of metabolism are complex disorders with huge variability in clinical manifestations. Decreasing cost of whole exome sequencing (WES) in recent years, made it affordable. Therefore, we witnessed an increase in using WES in diagnosis of genetic diseases, including inherited metabolic disorders. METHODS A systematic search was done in well-known databases including Medline, Google, Cochrane, and PubMed until 1 Oct 2017. We reviewed the articles addressing the use of WES in diagnosis of metabolic and neurogenetic diseases to evaluate its impact in diagnosis of these conditions. RESULTS WES is an effective technology with remarkable impact in diagnosis of metabolic and neurologic diseases, especially in complex cases. Diagnostic yield of WES for these conditions has large variety, ranging from 16% to 68% with an increase during recent years. WES can provide fresh valuable information about new disease, new variants and phenotypes. Careful analysis and interpretation of data obtained by WES and precise evaluation of correlation between clinical manifestation and WES findings are necessary to achieve a correct diagnosis. CONCLUSION WES is effective and useful technology for diagnosis of metabolic and neurogenetic diseases, especially in complex or unsolved cases.
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Affiliation(s)
- Marjan SHAKIBA
- Departmentof pediatric Endocrinology and Metabolism, Mofid Children’s hospital, Shahid Beheshti university of medical sciences, Tehran, Iran
| | - Mohammad KERAMATIPOUR
- Department of Medical Genetics Faculty of Medicine, Tehran University of Medical Sciences,Tehran, Iran
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11
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Abstract
This article reviews advancements in the genetics of malignant hyperthermia, new technologies and approaches for its diagnosis, and the existing limitations of genetic testing for malignant hyperthermia. It also reviews the various RYR1-related disorders and phenotypes, such as myopathies, exertional rhabdomyolysis, and bleeding disorders, and examines the connection between these disorders and malignant hyperthermia.
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