No association between FGD1 gene polymorphisms and intellectual developmental disability in the Qinba mountain area.
FGD1 encoding a guanine nucleotide exchange factor, specifically activates Rho GTPase cell division cycle 42 (Cdc42). Dysfunction of FGD1 causes Aarskog-Scott syndrome (MIM #305400), an X-linked disorder that may affect bone and intellectual development. However, the relationship between FGD1 and intellectual developmental disorders (IDD) remains unclear. The purpose of this study was to investigate the genetic association between the FGD1 polymorphism and IDD. Working with families from the Qinba mountain area where the occurrence of IDD is higher than the average in China, we analyzed 456 samples from 130 nuclear families, effectively controlling for stratification and environmental factors. Five SNP loci (rs2230265, rs7881608, rs2239809, rs6614244, and rs2284710) were selected that were well distributed within the FGD1 gene. Genotyping was performed through single-strand conformation polymorphism and restriction fragment length polymorphism. The data were analyzed with transmission disequilibrium tests. In the Qinba mountain area, no significant association was observed between IDD and allele or genotype frequencies, or the haplotype of the 5 SNP loci of the FGD1 gene. The results indicate that FGD1 may not be a monogenetic X-linked factor in IDD. Further studies are required to investigate its role in intellectual development based on its specific interactions with Cdc42 or other partner proteins contributing to IDD.
Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Institute of Population and Health, College of Life Science, Northwest University, Xian, Shaanxi, China.
J L
JL
Li
Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Institute of Population and Health, College of Life Science, Northwest University, Xian, Shaanxi, China.
Y J
YJ
Li
Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Institute of Population and Health, College of Life Science, Northwest University, Xian, Shaanxi, China.
K J
KJ
Zhang
Department of Pediatrics, Tangdu Hospital, The Fourth Military Medical University, Xian, Shaanxi, China.
L
L
Lan
Xian Institute of Mental Health, Xian, Shaanxi, China.
J G
JG
Shi
Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Institute of Population and Health, College of Life Science, Northwest University, Xian, Shaanxi, China.
X
X
Yang
Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Institute of Population and Health, College of Life Science, Northwest University, Xian, Shaanxi, China.
M J
MJ
Zhang
Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Institute of Population and Health, College of Life Science, Northwest University, Xian, Shaanxi, China.
F C
FC
Zhang
Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Institute of Population and Health, College of Life Science, Northwest University, Xian, Shaanxi, China gaoxc@nwu.edu.cn.
X C
XC
Gao
D000328:Adult; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D002681:China; D002658:Developmental Disabilities / Q000235:genetics*; D020662:Guanine Nucleotide Exchange Factors / Q000235:genetics*; D006801:Humans; D020641:Polymorphism, Single Nucleotide
C490796:FGD1 protein, human; D020662:Guanine Nucleotide Exchange Factors