CPAP and microcephalic primordial dwarfism: Interestingly, two genes associated with primary microcephaly, CEP152 (Guernsey et al., 2010; Kalay et al., 2011) and CENPJ (Bond et al., 2005) have also been associated with the microcephalic primordial dwarfism family of disorders, a group of conditions with global growth failure.