Phenotypic variation in the del(12p) syndrome

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Abstract
Previous reports suggested the existence of a del(12p) syndrome. Phenotypic abnormalities associated with del(12p) appear to be mental retardation, microcephaly, and micrognathia. The patient with del(12p) reported here was normocephalic and large for gestational age. She probably had sclerocornea, a finding not previously associated with del(12p). Phenotypic variation in del(12p) syndrome is probably caused by differences in the size of the deleted segment and/or the presence or absence of mutant genes on the homologous 12p segment.