Autosomal dominant: AVP gene mutationsAutosomal recessive: type a and b: AVP gene mutations; type c: WFS1 gene mutation—Wolfram (DIDMOAD) syndrome; type d: PCSK1 gene mutation (AVP-D + extreme obesity)X-linked recessive: gene unknownSepto-optic dysplasiaSchinzel-Giedion syndromeCuller-Jones syndromeAlstrom syndromeHartsfield syndromeWebb-Dattani (WEDAS) syndrome. The gene discussed is PCSK1; the disease is obesity due to melanocortin 4 receptor deficiency.