1. Unravelling the genetic causes of multiple malformation syndromes: A whole exome sequencing study of the Cypriot population
- Author
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George A. Tanteles, Thibaud Parpaite, Bertrand Coste, Athina Theodosiou, Ioannis Papaevripidou, Violetta Christophidou-Anastasiadou, Evie Kritioti, Nayia Nicolaou, Nina Séjourné, Angelos Alexandrou, Carolina Sismani, Cyprus Institute of Neurology and Genetics, Laboratoire de Neurosciences Cognitives [Marseille] (LNC), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), European Project: 678610,H2020,ERC-2015-STG,MECHANOGENOMICS(2016), and Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)
- Subjects
0301 basic medicine ,Heredity ,Gene Identification and Analysis ,Pathology and Laboratory Medicine ,Bioinformatics ,Homozygosity ,Cohort Studies ,Medical Conditions ,0302 clinical medicine ,PCNT ,Medicine and Health Sciences ,Medicine ,Exome sequencing ,education.field_of_study ,Heterozygosity ,Multidisciplinary ,RNA sequencing ,Genomics ,Congenital Anomalies ,3. Good health ,Infectious Diseases ,Cohort ,Pathogens ,Research Article ,Science ,Population ,Transfection ,03 medical and health sciences ,Diagnostic Medicine ,Exome Sequencing ,Genetics ,Congenital Disorders ,Humans ,Abnormalities, Multiple ,Clinical significance ,education ,Mutation Detection ,business.industry ,Biology and Life Sciences ,Human Genetics ,Human genetics ,Emerging Infectious Diseases ,030104 developmental biology ,[SDV.GEN.GH]Life Sciences [q-bio]/Genetics/Human genetics ,Karyotyping ,Etiology ,business ,030217 neurology & neurosurgery - Abstract
Multiple malformation syndromes (MMS) belong to a group of genetic disorders characterised by neurodevelopmental anomalies and congenital malformations. Here we explore for the first time the genetic aetiology of MMS using whole-exome sequencing (WES) in undiagnosed patients from the Greek-Cypriot population after prior extensive diagnostics workup including karyotype and array-CGH. A total of 100 individuals (37 affected), from 32 families were recruited and family-based WES was applied to detect causative single-nucleotide variants (SNVs) and indels. A genetic diagnosis was reported for 16 MMS patients (43.2%), with 10/17 (58.8%) of the findings being novel. All autosomal dominant findings occurred de novo. Functional studies were also performed to elucidate the molecular mechanism relevant to the abnormal phenotypes, in cases where the clinical significance of the findings was unclear. The 17 variants identified in our cohort were located in 14 genes (PCNT, UBE3A, KAT6A, SPR, POMGNT1, PIEZO2, PXDN, KDM6A, PHIP, HECW2, TFAP2A, CNOT3, AGTPBP1 and GAMT). This study has highlighted the efficacy of WES through the high detection rate (43.2%) achieved for a challenging category of undiagnosed patients with MMS compared to other conventional diagnostic testing methods (10–20% for array-CGH and ~3% for G-banding karyotype analysis). As a result, family-based WES could potentially be considered as a first-tier cost effective diagnostic test for patients with MMS that facilitates better patient management, prognosis and offer accurate recurrence risks to the families.
- Published
- 2021
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