Component of some chromatin complex recruited to chromatin sites methylated 'Lys-4' of histone H3 (H3K4me), with a preference for trimethylated form (H3K4me3). Component of a chromatin complex, at least composed of KDM5A, GATAD1 and EMSY. Ubiquitously expressed among various tissue types. Expressed in left ventricular myocytes. The disease is caused by variants affecting the gene represented in this entry.