has material basis in germline mutation in EHMT1 Kleefstra syndrome autosomal dominant non-syndromic intellectual disability Kleefstra syndrome 1 GARD:0025497 UMLS:C0795833 SCTID:724207001 Kleefstra syndrome Kleefstra syndrome 1 KLEFS1 MONDO:0027407 MESH:C563043 chromosome 9q34.3 deletion syndrome OMIM:610253 DOID:0060352 9q-syndrome An autosomal dominant non-syndromic intellectual disability that has material basis in an autosomal dominant mutation of EHMT1 on chromosome 9q34.3. DOID:0070075 NCIT:C129976 MEDGEN:208639