Putative Polycomb group (PcG) protein. PcG proteins act by forming multiprotein complexes, which are required to maintain the transcriptionally repressive state of homeotic genes throughout development. PcG proteins are not required to initiate repression, but to maintain it during later stages of development. They probably act via methylation of histones, rendering chromatin heritably changed in its expressibility (By similarity). Non-catalytic component of the PR- DUB complex, a complex that specifically mediates deubiquitination of histone H2A monoubiquitinated at 'Lys-119' (H2AK119ub1) (PubMed:30664650, PubMed:36180891). The PR-DUB complex is an epigenetic regulator of gene expression and acts as a transcriptional coactivator, affecting genes involved in development, cell communication, signaling, cell proliferation and cell viability (PubMed:30664650, PubMed:36180891). ASXL1, ASXL2 and ASXL3 function redundantly in the PR-DUB complex and are essential for chromatin recruitment and transcriptional activation of associated genes (By similarity). {ECO:0000250, ECO:0000250|UniProtKB:Q8C4A5, ECO:0000269|PubMed:30664650, ECO:0000269|PubMed:36180891}. This is the function of ASXL3 (ASXL transcriptional regulator 3, ENSG00000141431).