Ethnicity has a multiplex impact upon the risk of a full mutation expansion among female heterozygotes for FMR1 premutation.
Genet Med
; 23(6): 1023-1027, 2021 06.
Article
em En
| MEDLINE
| ID: mdl-33473206
ABSTRACT
PURPOSE:
To evaluate whether ethnicity affects the risk of full mutation expansion among females heterozygous for FMR1 premutation.METHODS:
Women who carry the FMR1 premutation alelle of Jewish origin who underwent fragile X prenatal diagnosis between 2011 and 2018 in two medical centers in Israel were included. The heterozygote women and fetuses were analyzed for the number of CGG repeats and AGG interruptions.RESULTS:
Seven hundred sixty-six subjects were included. Parental ethnicity was fully concordant in 592 cases (Jewish, Ashkenazi, and non-Ashkenazi). Ashkenazi compared with non-Ashkenazi heterozygotes have a significantly higher mean number of CGG repeats (68 ± 8.7, 64 ± 6.4 respectively, P = 0.03) and a lower mean number of AGG interruptions (0.89 ± 0.83, 1.60 ± 1.18 respectively, p = 0.0001). Overall, 56/198 (28.2%) fetuses of Ashkenazi heterozygotes had an expansion to a full mutation compared with 6/98 among the non-Ashkenazi (6.1%) (p = 0.001). Multivariate analysis demonstrated that, in addition to CGG repeats and AGG interruptions (which contributed 68.3% of variance), ethnicity is an independent risk factor for a full mutation expansion (odds ratio [OR] = 2.04, p < 0.001) and accounted for 9% of the variation of a full mutation expansion.CONCLUSION:
Apart from significant differences regarding the number of CGG repeats and AGG interruptions between Ashkenazi and non-Ashkenazi heterozygotes, ethnicity independently affects the risk of a full mutation.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Proteína do X Frágil da Deficiência Intelectual
/
Síndrome do Cromossomo X Frágil
Tipo de estudo:
Diagnostic_studies
/
Etiology_studies
/
Risk_factors_studies
Limite:
Female
/
Humans
País/Região como assunto:
Asia
Idioma:
En
Revista:
Genet Med
Assunto da revista:
GENETICA MEDICA
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
Israel