Involved in the positive regulation of starvation-induced autophagy. Secreted in a non-classical form. A signal peptide sequence at position 1-23 is predicted. Autosomal gene, which is the ortholog of human DHRSX, located at the termini of the long and short arms of the X and Y chromosomes. Belongs to the short-chain dehydrogenases/reductases (SDR) family.