A novel homozygous nonsense mutation in NECTIN4 gene in a Pakistani family with ectodermal dysplasia syndactyly syndrome 1
Document title: A novel homozygous nonsense mutation in NECTIN4 gene in a Pakistani family with ectodermal dysplasia syndactyly syndrome 1
Journal: Anais brasileiros de dermatologia
Database:
System number: 000558059
ISSN: 0365-0596
Authors: 1
2
3
4
4
2
1
Institutions: 1Hazara University, Faculty of Biological and Health Sciences, Mansehra, Khyber-Pakhtunkhwa. Pakistán
2Quaid-i-Azam University, Faculty of Biological Sciences, Islamabad. Pakistán
3Shaheed Benazir Bhutto Women University, Department of Bioinformatics, Peshawar, Khyber-Pakhtunkhwa. Pakistán
4Shaheed Zulfiqar Ali Bhutto Medical University, Department of General Medicine, Islamabad. Pakistán
5University of Copenhagen, Faculty of Health and Medical Sciences, Copenhagen. Dinamarca
Year:
Volumen: 98
Number: 5
Pages: 580-586
Country: Brasil
Language: Inglés
English abstract Background Ectodermal dysplasia syndactyly syndrome 1 (EDSS1) is a rare hereditary disorder characterized by defects in teeth, hair, and nails in association with a fusion of the digits. Genetically, the disease phenotypes are caused by homozygous and compound heterozygous variants in NECTIN4 gene. Objective The main objective of the study was to identify the pathogenic sequence variant(s) for family screening and identification of carriers. Methods In the present study, the authors have investigated a large consanguineous family of Pakistani origin segregating autosomal recessive EDSS1. All the coding exons of the NECTIN4 gene were directly sequenced using gene-specific primers. Results The affected individuals presented the classical EDSS1 clinical features including sparse hair, hypoplastic nails with thick flat discolored nail plates, peg-shaped, conical, and widely spaced teeth with enamel hypoplasia, proximal cutaneous syndactyly of fingers and toes. Sequence analysis of the coding region of the NECTIN4 identified a novel nonsense variant c.163C>T; p.(Arg55*) in exon-2 of the gene. Computational analysis of protein structure revealed that the variant induced premature termination at Arg55 located in Ig-like V-loop region leading to loss of Ig-C2 type domains and transmembrane region, and most likely Nectin-4 function will be lost. Study limitation Gene expression studies are absent that would have strengthened the findings of computational analysis. Conclusion The present study expanded the phenotypic and mutation spectrum of the NECTIN4 gene. Further, the study would assist in carrier testing and prenatal diagnosis of the affected families.
Keyword: Ectodermal dysplasia,
Palmoplantar keratoderma,
Poliovirus Receptor Related-4,
Nectin cell adhesion molecule-4,
Ectodermal dysplasia syndactyly syndrome 1
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