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Kleefstra syndrome spectrum (KSS ) < /strong>  is a rare genetic disorder whose characteristics include intellectual disability, low muscle tone, and distinctive facial features. Until this study, the only gene known to be associated with KSS was EHMT1â € ”but not everyone with the syndrome has changes in this gene. In this study, the researchers sought to identify the cause of KSS in people who did not have a change in EHMT1. They found changes in MBD5< /strong> , MLL3, SMARCB1, and NR113. < /p>