Genomic ancestry of a sample population from the state of Sao Paulo, Brazil
AMERICAN JOURNAL OF HUMAN BIOLOGY
Authors: Ferreira, Luzitano Brandao; Mendes-Junior, Celso Teixeira; Vieira Wiezel, Claudia Emilia; Luizon, Marcelo Rizzatti; Simoes, Aguinaldo Luiz
Abstract
Allelic frequencies of eight autosomal short-tandem repeat (STR) loci (TH01, TPOx, CSF1PO, vWA, FES/FPS, F13A1, F13B, and CD4) were determined in 400 individuals born in the State of Sao Paulo. No significant deviations from Hardy-Weinberg equilibrium were found in any loci analyzed. The Unweighted Pair-Group Method with Arithmetic Mean (UPGMA) tree constructed based on genetic distances revealed that the present population was grouped with Europeans, and separated from African and Amerindian populations. Estimates of admixture components based on the gene identity method revealed 79% European, 14% African, and 7% Amerindian contributions to this Brazilian population sample.
Homozygous intronic mutation leading to inefficient transcription combined with a novel frameshift mutation in F13A1 gene causes FXIII deficiency
JOURNAL OF HUMAN GENETICS
Authors: Wang, Wei; Huang, Lijun; Ma, Qiuling; Xiao, Deqian; Chen, Xiaodan; Yang, Zhigang; Wang, Xiaoying; Zhou, Keyuan; Li, Gang; Xiao, Man; Du, Guankui; Hao, Xinbao; Cai, Wangwei
Abstract
Two novel mutations, 602-605delAAAG in exon 5 and Int1(+12)C > A, of the F13A1 gene were identified in a Chinese factor XIII (FXIII)-deficient family. The 602-605delAAAG mutation results in the premature termination of translation. To determine the functional effect of the Int1(+12)A mutation, we transiently expressed luciferase reporters in U937 cells. We found that the first 951 bp of F13A1 intron 1 is involved in regulating the expression of the F13A1 gene and that Int1(+12)A results in its reduced expression. Electrophoretic mobility shift assay indicated that Int1(+12)A causes reduced protein binding. An Sp1 site was predicted in the sequence containing Int1(+12)C, which the Int1(+12)A mutation eliminates. Co-transfection of a plasmid expressing Sp1 revealed that Sp1 is involved in regulating the expression of FXIIIA and that Int1(+12) A leads to inefficient transcription. These results provide the first insight into a novel regulatory mechanism involving intron 1 in the F13A1 gene. Journal of Human Genetics (2011) 56, 460-463; doi:10.1038/jhg.2011.41; published online 21 April 2011