These mutations included X‐linked lymphoproliferative Disease Type 1 (XLP1), X‐linked lymphoproliferative syndrome‐2 (XLP‐2), Magnesium transporter 1 (MAGT1), Unc‐13 Homologue D (UNC13D), and SH2 Domain Containing 1A (SH2D1A). Here, MAGT1 is linked to X-linked lymphoproliferative syndrome.