Molecular analysis of two pre-mutations in myotonic dystrophy.

Abstract:

:Here we report two families with myotonic dystrophy (DM) in which the asymptomatic parent proved to be in a pre-mutation state. Polymerase chain reaction (PCR) analysis of the region spanning the CTG expansion demonstrated that one father of the proband possessed (CTG)n repeats of n = 12 and 44 copies and the other of 15 and 47. Clinical examination showed no definite signs of DM in these two men. Haplotype analysis of DNA markers close to the DM protein kinase (DMPK) gene suggested a common ancestral DM mutation. A continuous gradient of repeat sizes from normal to abnormal range can explain this phenomenon.

journal_name

Clin Genet

journal_title

Clinical genetics

authors

Yamagata H,Kinoshita M,Komori T,Kondo I,Miki T

doi

10.1034/j.1399-0004.1998.5440416.x

subject

Has Abstract

pub_date

1998-10-01 00:00:00

pages

354-7

issue

4

eissn

0009-9163

issn

1399-0004

journal_volume

54

pub_type

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