Original Article
Prenatal diagnosis for 30 women carrying a FMR1 mutation
Wen Huang, Jin Xue, Huaixing Kang, Xinxin Guan, Yanling Teng, Lingqian Wu, Ranhui Duan
Published 2019-09-10
Cite as Chin J Med Genet, 2019, 36(9): 866-869. DOI: 10.3760/cma.j.issn.1003-9406.2019.09.003
Abstract
ObjectiveTo determine the CGG repeat number and methylation status of FMR1 gene for fetuses whose mothers have carried a FMR1 mutation.
MethodsFor 30 pregnant women, the fetal CGG repeat number was determined with a GC-rich PCR system by using chorionic villus, amniotic fluid or umbilical blood samples. The methylation status of the FMR1 gene was confirmed with Southern blotting.
ResultsIn total 30 prenatal diagnoses were performed for 29 carriers of FMR1 gene mutations and 1 with FMR1 gene deletion mosaicism. Three fetuses were found to carry premutations, 9 were with full mutations and 1 with mosaicism of premutation and full mutations. Eighteen fetuses were normal.
ConclusionConsidering the genetic complexity of Fragile X syndrome (FXS), single method may not suffice accurate determination of their genetic status. The pitfalls and technical limitations of protocols requires adoption of personalized strategy for its prenatal diagnosis.
Key words:
Fragile X syndrome; CGG repeat; GC-rich PCR; Prenatal diagnosis
Contributor Information
Wen Huang
Center for Medical Genetics, School of Life Science, Central South University, Changsha, Hunan 410078, China
Jin Xue
Huaixing Kang
Xinxin Guan
Yanling Teng
Lingqian Wu
Ranhui Duan