Multi-omic analyses identify molecular targets of Chd7 that contribute to CHARGE syndrome model phenotypes.

Abstract

CHARGE syndrome is a developmental disorder that affects 1 in 10,000 births, and patients exhibit both physical and behavioral characteristics. De novo variants in chromodomain helicase DNA binding protein 7 (CHD7) cause 67% of CHARGE syndrome cases. CHD7 is a DNA-binding chromatin remodeler with thousands of predicted binding sites in the genome, making it challenging to define molecular pathways linking loss of CHD7 to CHARGE syndrome phenotypes. To address this problem, here, we used a previously characterized zebrafish model of CHARGE syndrome to generate transcriptomic and proteomic datasets from larval zebrafish head tissue at two developmental time points. By integrating these datasets with differential expression, pathway and upstream regulator analyses, we identified multiple consistently dysregulated pathways and defined a set of candidate genes that link loss of chd7 with disease-related phenotypes. Finally, we identified that CRISPR/Cas9-mediated knockdown of capgb, nefla or rdh5 phenocopies behavioral defects seen in chd7 mutants, functionally validating the roles of these genes. Our data provide a resource for further investigation of molecular mediators of CHD7 and a template to reveal functionally relevant therapeutic targets to alleviate specific aspects of CHARGE syndrome.