Ataxia telangiectasia; DOCK8; EV (EVER1, EVER2, RHOH; LCK); GATA2; Idiopathic T cell lymphopenia; Netherton syndrome; STK4/MST1; WHIM (CXCR4); WILD, CARMIL2/RLTPR, Clouston’s syndrome. The gene discussed is CXCR4; the disease is Ataxia-telangiectasia.