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APOL1 variants increase risk for FSGS and HIVAN but not IgA nephropathy
Authors:Papeta Natalia  Kiryluk Krzysztof  Patel Ami  Sterken Roel  Kacak Nilgun  Snyder Holly J  Imus Phil H  Mhatre Anand N  Lawani Anil K  Julian Bruce A  Wyatt Robert J  Novak Jan  Wyatt Christina M  Ross Michael J  Winston Jonathan A  Klotman Mary E  Cohen David J  Appel Gerald B  D'Agati Vivette D  Klotman Paul E  Gharavi Ali G
Affiliation:Department of Medicine, Columbia University College of Physicians and Surgeons, New York, New York 10032, USA.
Abstract:A chromosome 22q13 locus strongly associates with increased risk for idiopathic focal segmental glomerulosclerosis (FSGS), HIV-1-associated nephropathy (HIVAN), and hypertensive ESRD among individuals of African descent. Although initial studies implicated MYH9, more recent analyses localized the strongest association within the neighboring APOL1 gene. In this replication study, we examined the six top-most associated variants in APOL1 and MYH9 in an independent cohort of African Americans with various nephropathies (44 with FSGS, 21 with HIVAN, 32 with IgA nephropathy, and 74 healthy controls). All six variants associated with FSGS and HIVAN (additive ORs, 1.8 to 3.0; P values 3 × 10(-2) to 5 × 10(-5)) but not with IgA nephropathy. In conditional and haplotype analyses, two APOL1 haplotypes accounted for virtually all of the association with FSGS and HIVAN on chromosome 22q13 (haplotype P value = 5.6 × 10(-8)). To assess the role of MYH9 deficiency in nephropathy, we crossbred Myh9-haploinsufficient mice (Myh9(+/-)) with HIV-1 transgenic mice. Myh9(+/-) mice were healthy and did not demonstrate overt proteinuria or nephropathy, irrespective of the presence of the HIV-1 transgene. These data further support the strong association of genetic variants in APOL1 with susceptibility to FSGS and HIVAN among African Americans.
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