The largest genetic screening for reading and language measures conducted to date is now out in preprint https://www.biorxiv.org/content/10.1101/2021.11.04.466897v1. The results report on data collected over decades by the GenLang consortium a truly international and cross-disciplinary team. A nice summary of the study can be found in this Twitter thread by Simon Fisher, lead author with Else Eising.
