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 (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 152-kD centrosomal protein gene (CEP152, 613529.0001);