Four of these seven (HNRNPA0, HNRNPA3, HNRNPA1, and HNRNPA2B1) are in a group closely related to an NDD hnRNP group (group 2; Fig. 1), suggesting that they may be implicated in NDDs, but mutations occur much less frequently. This evidence concerns the gene HNRNPA1 and Neurodevelopmental delay.