Abstract
Purpose
Hirschsprung’s disease (HSCR) is a congenital disorder of the enteric nervous system characterized by the absence of ganglion cells in the Auerbach’s and Meissner’s plexuses. Although about 7% of cases are hereditary, the causal mutations have not been completely characterized. We encountered a novel family with inherited HSCR and screened them for causal mutations.
Methods
A Japanese family of five female patients and six unaffected individuals was subjected to a whole-exome analysis with a next-generation sequencer.
Results
After exome sequencing and the annotation of mutations, we identified co-segregated mutations with sequential filtering steps via a standard protocol. Eight mutations were identified: two on chromosome 10 and six on chromosome 11. We used pathogenicity prediction tools such as Genomic Evolutionary Rate Profiling, SIFT, and PolyPhen2 to predict the impact of mutations on the protein activity. S922Y, a novel mutation of RET, was identified as a likely causal mutation. In addition, a mutation of rs2435357T, known as enhancer of RET located in intron 1 of RET, was detected in this family.
Conclusion
The coexistence of RET mutations in both the exon (S922Y) and intron1 (rs2435357T) indicated a risk of HSCR in this family.
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Kawano, T., Hosomichi, K., Inoue, I. et al. Identification of a novel variant of the RET proto-oncogene in a novel family with Hirschsprung’s disease. Pediatr Surg Int 33, 1041–1046 (2017). https://doi.org/10.1007/s00383-017-4134-z
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DOI: https://doi.org/10.1007/s00383-017-4134-z