Microcephaly 2, primary, autosomal recessive, with or without cortical malformations

Microcephaly-2 with or without cortical malformations is an autosomal recessive neurodevelopmental disorder showing phenotypic variability. Classically, primary microcephaly is a clinical diagnosis made when an individual has a head circumference more than 3 standard deviations (SD) below the age- and sex-matched population mean, and mental retardation with no other associated malformations and with no apparent etiology (Hofman, 1984). Patients with WDR62 mutations have head circumferences ranging from low-normal to severe (-9.8 SD), and most patients with brain scans have shown various types of cortical malformations. All have delayed psychomotor development; seizures are variable (summary by Yu et al., 2010). For a general phenotypic description and a discussion of genetic heterogeneity of primary microcephaly, see MCPH1 (251200).

OMIM