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Current Genomics

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ISSN (Print): 1389-2029
ISSN (Online): 1875-5488

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Research Article

High Prevalence of a c.5979dupA Variant in the Dysferlin Gene (DYSF) in Individuals from a Semiarid Region of Brazil

Author(s): Isabella A. Motta, Maria L.A. Gouveia, Ana P.M. Braga, Rafael S. Andrade, Mayra F.F. Montenegro, Sandra N. Gurgel, Keila M.F. Albuquerque, Priscilla A.N.G. Souto, Flávia P.B.F. Cardoso, Joseane S. Araujo, Mirella C.L. Pinheiro, Carlos E.P. da Silva, Pamella A.S. Gurgel, David Feder, Matheus M. Perez, Glaucia L. da Veiga, Beatriz C.A. Alves, Fernando L.A. Fonseca and Alzira A.S. Carvalho*

Volume 24, Issue 5, 2023

Published on: 25 October, 2023

Page: [330 - 335] Pages: 6

DOI: 10.2174/0113892029257856231013115036

Price: $65

Abstract

Background: Dysferlinopathies represent a group of limb girdle or distal muscular dystrophies with an autosomal-recessive inheritance pattern resulting from the presence of pathogenic variants in the dysferlin gene (DYSF).

Objective: In this work, we describe a population from a small city in Brazil carrying the c.5979dupA pathogenic variant of DYSF responsible for limb girdle muscular dystrophy type 2R and distal muscular dystrophy.

Methods: Genotyping analyses were performed by qPCR using customized probe complementary to the region with the duplication under analysis in the DYSF.

Results: A total of 104 individuals were examined. c.5979dupA was identified in 48 (46.15%) individuals. Twenty-three (22%) were homozygotes, among whom 13 (56.5%) were female. A total of 91.3% (21) of homozygous individuals had a positive family history, and seven (30.4%) reported consanguineous marriages. Twenty-five (24%) individuals were heterozygous (25.8±16 years) for the same variant, among whom 15 (60%) were female. The mean CK level was 697 IU for homozygotes, 140.5 IU for heterozygotes and 176 IU for wild-type homo-zygotes. The weakness distribution pattern showed 17.3% of individuals with a proximal pattern, 13% with a distal pattern and 69.6% with a mixed pattern. Fatigue was present in 15 homozygotes and one heterozygote.

Conclusion: The high prevalence of this variant in individuals from this small community can be explained by a possible founder effect associated with historical, geographical and cultural aspects.

Keywords: Dysferlin, limb girdle muscular dystrophy, miyoshi myopathy, distal myopathy, genetic testing, dysferlinopathy.

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