MCPH1 and autosomal recessive primary microcephaly: The autosomal recessive form of primary microcephaly (MCPH) is a rare genetic disorder that is characterized by head circumference less than three standard deviation below the mean from age and sex associated with mild to severe intellectual disability.1 Twenty four genes MCPH1-MCPH24 have been reported so far those may be involved in the underlying cause of autosomal recessive primary microcephaly.