Recurrence risk due to germ line mosaicism: Duchenne and Becker muscular dystrophy.
Clin Genet
; 75(5): 465-72, 2009 May.
Article
en En
| MEDLINE
| ID: mdl-19475718
The presence of multiple affected offspring from apparently non-carrier parents is caused by germ line mosaicism. Although germ line mosaicism has been reported for many diseases, figures for recurrence risks are known for only a few of them. In X-linked Duchenne and Becker muscular dystrophies (DMD/BMD), the recurrence risk for non-carrier females due to germ line mosaicism has been estimated to be between 14% and 20% (95% confidence interval 3-30) if the risk haplotype is transmitted. In this study, we have analyzed 318 DMD/BMD cases in which the detected mutation was de novo with the aim of obtaining a better estimate of the 'true' number of germ line mosaics and a more precise recurrence risk. This knowledge is essential for genetic counseling. Our data indicate a recurrence risk of 8.6% (4.8-12.2) if the risk haplotype is transmitted, but there is a remarkable difference between proximal (15.6%) (4.1-27.0) and distal (6.4%) (2.1-10.6) deletions. Overall, most mutations originated in the female. Deletions occur more often on the X chromosome of the maternal grandmother, whereas point mutations occur on the X chromosome of the maternal grandfather. In unhaplotyped de novo DMD/BMD families, the risk of recurrence of the mutation is 4.3%.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Mutación de Línea Germinal
/
Distrofia Muscular de Duchenne
/
Mosaicismo
Tipo de estudio:
Etiology_studies
/
Risk_factors_studies
Límite:
Female
/
Humans
/
Male
Idioma:
En
Revista:
Clin Genet
Año:
2009
Tipo del documento:
Article
País de afiliación:
Países Bajos
Pais de publicación:
Dinamarca