Probable transcription factor that acts in a feed-forward loop with nhr-10 to activate genes, including itself, involved in the vitamin B12-independent breakdown of the short-chain fatty acid propionate (PubMed:30625328). This pathway is triggered in response to a diet low in vitamin B12, when canonical vitamin B12-dependent propionate breakdown cannot function; the resulting accumulation of propionate is probably sensed by nhr-68 and/or nhr-10 (PubMed:30625328). RNAi-mediated knockdown abolishes expression of acdh-1 when diet is supplemented with 5 nM vitamin B12 and high levels (40 mM) of propionate. Belongs to the nuclear hormone receptor family.