Molecular diagnosis of homozygous myotonic dystrophy in two asymptomatic sisters.

Abstract:

:The genetic defect underlying myotonic dystrophy (DM) has been identified as the expansion of an unstable trinucleotide repeat sequence, and this discovery has led to new approaches to diagnosis and genetic counselling in families with the disorder. We report the genetic analysis of a consanguineous DM family in which two asymptomatic sisters had been shown to be homozygous for the 'at risk' haplotype. PCR analysis of the region spanning the trinucleotide expansion demonstrated that both sisters possessed two alleles with repeat sizes normally seen in minimally affected patients. Extensive clinical examination failed to demonstrate any of the symptoms of DM in these women. The implications of this finding, both for understanding the disease mechanism, and for genetic counselling in such situations are discussed.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Cobo A,Martinez JM,Martorell L,Baiget M,Johnson K

doi

10.1093/hmg/2.6.711

subject

Has Abstract

pub_date

1993-06-01 00:00:00

pages

711-5

issue

6

eissn

0964-6906

issn

1460-2083

journal_volume

2

pub_type

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