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hildren were used as controls(matched for sex and age). Genomic DNA was obtained from peripheral blood. Exon 1 of WNT8b gene and the exon 1 of SHH gene were analyzed for gene mutation. The mutation products were automatically sequenced. The levels of WNT8b and SHH mRNA were detected by quantitative real-time PCR(qRT-PCR) in blood samples.
RESULTS: On sequencing, 13 out of 72 children with HSCR had WNT8b gene mutation in the coding area, including heterozygosity deletion in 8 cases (11.1%) and base replacement in 5(6.9%). Eleven children with HSCR had SHH gene mutation in the coding area including heterozygosity deletion in 7 cases(9.7%) and base replacement in 4(5.6%). No mutations in WNT8b and SHH genes were found in the control group. The WNT8b and SHH mRNA levels were different between the study group and the control group(30.01±1.13 vs. 17.33±0.62, and 28.25±1.27 vs. 18.94±0.31, P<0.05).
CONCLUSIONS: WNT8b and SHH mutations and abnormal expressions are present in the peripheral blood of children with sporadic HSCR. These two genes may be related to the development of sporadic HSCR in children in the northeastern China.