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Infantile hypertrophic pyloric stenosis: evaluation of three positional candidate genes, TRPC1, TRPC5 and TRPC6, by association analysis and re-sequencing

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Abstract

Infantile hypertrophic pyloric stenosis (IHPS) is the most common inherited form of gastrointestinal obstruction in infancy with a striking male preponderance. Infants present with vomiting due to gastric outlet obstruction caused by hypertrophy of the smooth muscle of the pylorus. Two loci specific to extended pedigrees displaying autosomal dominant inheritance have been identified. A genome scan identified loci on chromosomes 11q14–q22 and Xq23–q24 which are predicted to be responsible for a subset of smaller families with IHPS demonstrating non-Mendelian inheritance. The two linked chromosomal regions both harbour functional candidate genes which are members of the canonical transient receptor potential (TRPC) family of ion channels. Both TRPC5 (Xq23–q24) and TRPC6 (11q14–q22) have a potential role in smooth muscle control and hypertrophy. Here, we report suggestive evidence for a third locus on chromosome 3q12–q25 (Z max = 2.7, p < 0.004), a region which harbours a third TRPC gene, TRPC1. Fine mapping of all three genes using a tagSNP approach and re-sequencing identified a SNP in the promoter region of TRPC6 and a missense variant in exon 4 of TRPC6 which may be putative causal variants.

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Acknowledgments

This work was supported by the Newlife Foundation and Action Medical Research. We are very grateful to all the families that participated in this study. We would like to thank Professors Prem Puri and Agostino Pierro, Dr Sally Mitton, and Mrs Cathy Cord-Udy as well as K. Rogers, N. Johnson, A. Massoud and J. Mulligan for their contribution to the family ascertainment effort. We would like to thank K. Parker for technical assistance and H. Mitchison for critical assessment of the manuscript.

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  1. Molecular Medicine Unit, University College London Institute of Child Health, 30 Guilford Street, London, WC1N 1EH, UK

    Kate V. Everett, Barry A. Chioza, Christina Georgoula, Ashley Reece, R. Mark Gardiner & Eddie M. K. Chung

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  1. Kate V. Everett
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  2. Barry A. Chioza
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Correspondence to Kate V. Everett.

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Everett, K.V., Chioza, B.A., Georgoula, C. et al. Infantile hypertrophic pyloric stenosis: evaluation of three positional candidate genes, TRPC1, TRPC5 and TRPC6, by association analysis and re-sequencing. Hum Genet 126, 819–831 (2009). https://doi.org/10.1007/s00439-009-0735-5

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