PTBP2 and Neurodevelopmental delay: This resulted in 16 genes with at least one published case as potential NDD candidate genes: HNRNPA0, HNRNPA3, HNRNPAB, HNRNPA2B1, HNRNPC, HNRNPD, HNRNPF, HNRNPH1, HNRNPH2, PTBP2, HNRNPK, HNRNPLL, SYNCRIP, HNRNPR, HNRNPU, and HNRNPUL1 (n = 117 probands; Fig. 1, Additional File 1: Tables S1, S7, S8, and S11).