ATR-X syndrome

ATR-X is alpha thalassemia with mental retardation on the X chromosome. 

http://www.imm.ox.ac.uk/atr-x-syndrome-information

http://www.ojrd.com/content/pdf/1750-1172-1-15.pdf

http://www.rarediseases.org/rare-disease-information/rare-diseases/byID/1167/printFullReport