ABCG2 and X-linked adrenoleukodystrophy: We show that loss of the Drosophila long-/very-long-chain acyl-CoA synthetase genes bgm and/or dbb is indistinguishable from loss of the Drosophila ABC transporter gene ABCD. Shared loss-of-function phenotypes for synthetase and transporter mutants point to a lipid metabolic pathway association with ALD-like neurodegenerative disease in Drosophila; a pathway association that has yet to be established in humans.