A mentally retarded boy with discrete physical findings, Hirschsprung disease (HD) and a microdeletion of 13q,del(13)(q32.3q33.2) is described. Band 13q33.1 was consistently missing in all cells. There have been, to date, 4 published cases of deletions involving the long arm of chromosome 13 associated with HD: the interstitial deletion reported here is much smaller than, and it partially overlaps with, the previously reported deletions; it could be helpful for mapping one of the genes involved in this disease.
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