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. Expressed in the eye (lens, ciliary body, retina, sclera and conjunctiva) at postnatal day 2 and 10. Not detected anywhere at postnatal day 14. Expressed in embryo at 13 dpc onwards. Expressed in embryonic heart at all stages of development. Truncated C-terminus.