Heyn-Sproul-Jackson Syndrome, also known as microcephaly, short stature, and impaired intellectual development, is related to tatton-brown-rahman syndrome and rahman syndrome. An important gene associated with Heyn-Sproul-Jackson Syndrome is DNMT3A (DNA Methyltransferase 3 Alpha). Affiliated tissues include brain and bone, and related phenotypes are microcephaly and severe short stature