The combination of two silent mutations, c.1311C>T in exon 11 and IVS11 T93C (glucose-6-phosphate dehydrogenase (G6PD) 1311T/93C), with unknown mechanism, have been reported in G6PD-deficient individuals in Asian populations including Malaysian aboriginal group, Negrito. Here, we report the screening of G6PD gene in 103 Negrito volunteers using denaturing high-performance liquid chromatography (dHPLC) and direct sequencing. A total of 48 individuals (46.6%) were G6PD deficient, 83.3% of these carried G6PD 1311T/93C with enzyme activity ranging from 1.8 to 4.8 U gHb(-1). Three novel single-nucleotide polymorphisms (SNPs), rs112950723, rs111485003 and rs1050757, were found in the G6PD 3'-untranslated region (UTR). Strong association was observed between haplotype 1311T/93C and rs1050757G, which is located inside the 35 bp AG-rich region. In silico analysis revealed that the transition of A to G at position rs1050757 makes significant changes in the G6PD mRNA secondary structure. Moreover, putative micro (mi)RNA target sites were identified in 3'-UTR of G6PD gene, two of these in the region encompassing rs1050757. It could be speculated that rs1050757 have a potential functional effect on the downregulation of mRNA and consequently G6PD deficiency either by affecting mRNA stability and translation or mirRNA regulation process. This is the first report of biochemical association of an SNP in 3'-UTR of G6PD gene and the possible role of mRNA secondary structure.
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