FRI054 Partial Lipodystrophy As A Manifestation Of Autoimmune Polyglandular Syndrome 1

Disclosure: S. Agarwal: None. C. Xing: None. M.S. Anderson: Stock Owner; Self; Medtronic Diabetes, Merck. A. Garg: None. Background: Autoimmune polyglandular syndrome 1 (APS1) is a rare autosomal recessive disorder due to mutations in AIRE gene that manifests mainly with chronic mucocutaneous candidiasis, primary hypoparathyroidism and adrenal insufficiency. We report an extremely rare APS1 patient who developed partial lipodystrophy during adulthood. Clinical Case: This 39-year-old white female developed frequent diaper rashes, oral thrush and tetany at the age of one year due to candidiasis and hypoparathyroidism. At 6 years, she developed hypothyroidism. At 11 years, she developed fatigue, excessive thirst, and anorexia due to primary adrenal insufficiency. At 13 years of age, she had thelarche and adrenarche but never attained menarche. At 14 years, she underwent a sibling matched allogenic bone marrow transplant due to multiple antibiotic-refractory fungal infections. At 35 years, her serum triglycerides level was 904 mg/dL and loss of subcutaneous fat from the upper and lower extremities and hips was noted but she had increased subcutaneous fat on the chest and abdomen as well as buffalo hump. Thigh skinfold thickness was 8 mm (<10th percentile of normal). A whole-body dual-energy X-ray absorptiometry revealed a total body fat of 38% with lower extremity fat of 25%-27% (<1st percentile of normal). Whole exome sequencing on DNA extracted from saliva revealed two pathogenic variants in AIRE gene; c.83T>C; p.Leu28Pro and c.769C>T; p.Arg257* confirming the diagnosis of APS1. No other pathogenic variants were noted in the known lipodystrophy genes. Serum was negative for anti-perilipin 1 autoantibody. Discussion: Biallelic mutations in the AIRE hinder the process of selective apoptosis of T-cells in the thymic medulla that have a strong affinity to self-antigens leading to autoimmunity manifesting as APS1. Previously, a 5-year-old boy with APS1 was reported to develop generalized lipodystrophy and his serum was positive for anti-perilipin 1 autoantibody. Recently, serum anti-perilipin-1 autoantibodies have also been reported in the Aire gene knock out mice. In contrast, our patient has partial lipodystrophy and was negative for anti-perilipin 1 autoantibody. This suggests that patients with APS1 may harbor many different autoantibodies against adipocyte expressed proteins and develop different patterns of autoimmune lipodystrophies. Presentation: Friday, June 16, 2023