RET mutational spectrum in Hirschsprung disease: evaluation of 601 Chinese patients.
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So MT, Leon TY, Cheng G, Tang CS, Miao XP, Cornes BK, Diem NN, Cui L, Ngan ES, Lui VC, Wu XZ, Wang B, Wang H, Yuan ZW, Huang LM, Li L, Xia H, Zhu D, Liu J, Nguyen TL, Chan IH, Chung PH, Liu XL, Zhang R, Wong KK, Sham PC, Cherny SS, Tam PK, Garcia-Barcelo MM
RET mutational spectrum in Hirschsprung disease: evaluation of 601 Chinese patients.
PLoS One. 2011;6(12):e28986. doi: 10.1371/journal.pone.0028986. Epub 2011 Dec 9.
- PubMed ID
- 22174939 [ View in PubMed]
- Abstract
Rare (RVs) and common variants of the RET gene contribute to Hirschsprung disease (HSCR; congenital aganglionosis). While RET common variants are strongly associated with the commonest manifestation of the disease (males; short-segment aganglionosis; sporadic), rare coding sequence (CDS) variants are more frequently found in the lesser common and more severe forms of the disease (females; long/total colonic aganglionosis; familial).Here we present the screening for RVs in the RET CDS and intron/exon boundaries of 601 Chinese HSCR patients, the largest number of patients ever reported. We identified 61 different heterozygous RVs (50 novel) distributed among 100 patients (16.64%). Those include 14 silent, 29 missense, 5 nonsense, 4 frame-shifts, and one in-frame amino-acid deletion in the CDS, two splice-site deletions, 4 nucleotide substitutions and a 22-bp deletion in the intron/exon boundaries and 1 single-nucleotide substitution in the 5' untranslated region. Exonic variants were mainly clustered in RET the extracellular domain. RET RVs were more frequent among patients with the most severe phenotype (24% vs. 15% in short-HSCR). Phasing RVs with the RET HSCR-associated haplotype suggests that RVs do not underlie the undisputable association of RET common variants with HSCR. None of the variants were found in 250 Chinese controls.