RBM8A and thrombocytopenia-absent radius syndrome: It has been elucidated that the mechanism of TAR syndrome is the biallelic variations in the RBM8A gene (MIM ∗ 605313, Chr1: 145,921,555-145,927,483) [12], typically including the situation of a deletion at the proximal 1q21.1 region (a.k.a., TAR deletion) with a minimal size of 200 kb that encompasses the RBM8A gene combining with a point mutation in the noncoding region of RBM8A [13].