Carrier screening for (CGG)n repeat expansion of FMR1 gene in Korean women.
- Author:
Kyung Min KANG
1
;
Se Ra SUNG
;
Ji Eun PARK
;
Yun Jeong SHIN
;
Sang Hee PARK
;
Mi Uk CHIN
;
Sang Woo LYU
;
Dong Hyun CHA
;
Sung Han SHIM
Author Information
- Publication Type:Original Article
- Keywords: Fragile X syndrome; Trinucleotide repeat expansion; Primary ovarian failure; Gene frequency; Carrier state
- MeSH: Alleles; Asian Continental Ancestry Group; Bias (Epidemiology); Blotting, Southern; Carrier State; Female; Fragile X Syndrome; Gene Frequency; Genetic Counseling; Humans; Mass Screening*; Polymerase Chain Reaction; Pregnant Women; Prevalence; Trinucleotide Repeat Expansion
- From:Journal of Genetic Medicine 2016;13(1):14-19
- CountryRepublic of Korea
- Language:English
- Abstract: PURPOSE: We examined the prevalence and CGG/AGG repeat structure of expanded alleles of the FMR1 gene in preconceptional and pregnant Korean women. MATERIALS AND METHODS: The CGG repeats in the FMR1 genes of 1,408 women were analyzed by polymerase chain reaction and Southern blot analysis. To estimate the prevalence of expansion alleles, the individuals were divided into low risk and high risk group. RESULTS: Within this population, 98.4% had normal alleles and 1.6% had abnormal alleles including intermediate (0.6%), premutation (0.5%), full mutation (0.1%), and hemizygous (0.4%) alleles. There were 2 premutation alleles (1:666, 95% confidence interval [CI] 1:250-1,776) in the low risk group and 5 premutation alleles (1:15, 95% 1:6-36) in the high risk group. There were 8 intermediate alleles (1:167, 95% CI 1:130-213) in the low risk group and 1 intermediate alleles (1:76, 95% CI 1:11-533) in the high group. Six of the 7 premutation alleles did not contain AGG interruptions within the repeats and 1 had a single AGG interruption. Four of the 9 intermediate alleles contained 2-3 AGG, 4 had a single AGG, and 1 had no AGG interruptions. CONCLUSION: Our study demonstrates the prevalence and CGG/AGG structure of expansion alleles in Korean women. The identified premutation prevalence is higher than that of other Asian populations and lower than that of Caucasian populations. Although our study is limited by size and population bias, our findings could prove useful for genetic counseling of preconceptional or pregnant women.
