FMR1 CGG expansions: prevalence and sex ratios.
Am J Med Genet B Neuropsychiatr Genet
; 162B(5): 466-73, 2013 Jul.
Article
en En
| MEDLINE
| ID: mdl-23740716
ABSTRACT
We have estimated the prevalence of FMR1 premutation and gray zone CGG repeat expansions in a population-based sample of 19,996 male and female adults in Wisconsin and compared the observed sex ratios of the prevalence of FMR1 CGG premutation and gray zone expansions to theoretical sex ratios. The female premutation prevalence was 1 in 148 and comparable to past research, but the male premutation prevalence of 1 in 290 is somewhat higher than most previous estimates. The femalemale premutation prevalence ratio is in line with the theoretically predicted sex ratio. The prevalence of CGG repeats in the gray zone (45-54 repeats) was 1 in 33 females and 1 in 62 males. The prevalence of the "expanded" gray zone (defined here as 41-54 CGG repeats) was 1 in 14 females and 1 in 22 males, leading to a femalemale ratio of 1.62 (95% confidence interval 1.39-1.90). This femalemale ratio was significantly lower than the expected ratio of 2.0. We examined results from three previously published FMR1 prevalence studies and found similar femalemale ratios for CGG repeats in this "expanded" gray zone range (pooled femalemale ratio across all four studies 1.66, 95% confidence interval 1.51-1.82). Further research is needed to understand the apparent excess prevalence of males with CGG repeats in this range.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Razón de Masculinidad
/
Repeticiones de Trinucleótidos
/
Proteína de la Discapacidad Intelectual del Síndrome del Cromosoma X Frágil
Tipo de estudio:
Prevalence_studies
/
Risk_factors_studies
Límite:
Adult
/
Female
/
Humans
/
Male
País/Región como asunto:
America do norte
Idioma:
En
Revista:
Am J Med Genet B Neuropsychiatr Genet
Asunto de la revista:
GENETICA MEDICA
/
NEUROLOGIA
/
PSIQUIATRIA
Año:
2013
Tipo del documento:
Article
País de afiliación:
Estados Unidos