The following links are additional resources about ZTTK Syndrome and the SON Gene. These links include the two original articles identifying the syndrome that were simultaneously published by The University of South Alabama and Baylor University.
Zhu-Tokita-Takenouchi-Kim Syndrome: ZTTK Multiple Congenital Anomalies-Mental Retardation Syndrome
NAN BYO Research - SON mutation causes intellectual disability
Genetic and Rare Diseases Information Center - ZTTK Syndrome
Hereditary Ocular Disease Database - ZTTK Syndrome
MalaCards Human Disease Database - ZTTK Syndrome
University of South Alabama - Leukemia Research Leads to Discovery of Syndrome