The function of ENSG00000064726 (BTBD1, BTB domain containing 1) is as follows. Probable substrate-specific adapter of an E3 ubiquitin- protein ligase complex which mediates the ubiquitination and subsequent proteasomal degradation of target proteins (PubMed:14528312). Seems to regulate expression levels and/or subnuclear distribution of TOP1, via an unknown mechanism (By similarity). May play a role in mesenchymal differentiation where it promotes myogenic differentiation and suppresses adipogenesis (By similarity). {ECO:0000250|UniProtKB:P58544, ECO:0000269|PubMed:14528312}.