Enables unmethylated CpG binding activity. Acts upstream of or within several processes, including chordate embryonic development; heart looping; and positive regulation of macromolecule metabolic process. Located in chromatin. Is expressed in embryo; forebrain; and limb. Human ortholog(s) of this gene implicated in lung non-small cell carcinoma. Orthologous to human KDM2A (lysine demethylase 2A). [provided by Alliance of Genome Resources, Apr 2022]