Description : Primary microcephaly (MCPH) is a clinical diagnosis made when an individual has a
head circumference more than 3 standard deviations below the age- and sex-matched
population mean and mental retardation, with no other associated malformations and
with no apparent etiology. Most cases of primary microcephaly show an autosomal recessive
mode of inheritance (summary by Woods et al., 2005). For a general phenotypic description
and a discussion of genetic heterogeneity of primary microcephaly, see MCPH1 (251200).;
Inheritance : Autosomal recessive;
Molecular basis : Caused by mutation in the cancer susceptibility candidate 5 gene (CASC5, 609173.0001);