ZDHHC15 and cask-related x-linked intellectual disability: Specific RT‒PCR analysis of zDHHC15 in lymphocytes from XLID patients showed the presence of zDHHC15 transcript variants in patient samples, and it was hypothesized that deleting the zDHHC15 transcript contributed to the XLID phenotype, suggesting that zDHHC15 is a strong candidate gene for the diagnosis of nonsyndromic XLID (Mansouri et al., 2005).