A Genome-Wide Association Study Identifies Blood Disorder–Related Variants Influencing Hemoglobin A1c With Implications for Glycemic Status in U.S. Hispanics/Latinos
In: Diabetes Care, Jg. 42 (2019-09-01), Heft 9
Online
academicJournal
- 1784 - 1791
ObjectiveWe aimed to identify hemoglobin A1c (HbA1c)-associated genetic variants and examine their implications for glycemic status evaluated by HbA1c in U.S. Hispanics/Latinos with diverse genetic ancestries.Research design and methodsWe conducted a genome-wide association study (GWAS) of HbA1c in 9,636 U.S. Hispanics/Latinos without diabetes from the Hispanic Community Health Study/Study of Latinos, followed by a replication among 4,729 U.S. Hispanics/Latinos from three independent studies.ResultsOur GWAS and replication analyses showed 10 previously known and novel loci associated with HbA1c at genome-wide significance levels (P < 5.0 × 10-8). In particular, two African ancestry-specific variants, HBB-rs334 and G6PD-rs1050828, which are causal mutations for sickle cell disease and G6PD deficiency, respectively, had ∼10 times larger effect sizes on HbA1c levels (β = -0.31% [-3.4 mmol/mol]) and -0.35% [-3.8 mmol/mol] per minor allele, respectively) compared with other HbA1c-associated variants (0.03-0.04% [0.3-0.4 mmol/mol] per allele). A novel Amerindian ancestry-specific variant, HBM-rs145546625, was associated with HbA1c and hematologic traits but not with fasting glucose. The prevalence of hyperglycemia (prediabetes and diabetes) defined using fasting glucose or oral glucose tolerance test 2-h glucose was similar between carriers of HBB-rs334 or G6PD-rs1050828 HbA1c-lowering alleles and noncarriers, whereas the prevalence of hyperglycemia defined using HbA1c was significantly lower in carriers than in noncarriers (12.2% vs. 28.4%, P < 0.001). After recalibration of the HbA1c level taking HBB-rs334 and G6PD-rs1050828 into account, the prevalence of hyperglycemia in carriers was similar to noncarriers (31.3% vs. 28.4%, P = 0.28).ConclusionsThis study in U.S. Hispanics/Latinos found several ancestry-specific alleles associated with HbA1c through erythrocyte-related rather than glycemic-related pathways. The potential influences of these nonglycemic-related variants need to be considered when the HbA1c test is performed.
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A Genome-Wide Association Study Identifies Blood Disorder–Related Variants Influencing Hemoglobin A1c With Implications for Glycemic Status in U.S. Hispanics/Latinos
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Autor/in / Beteiligte Person: | Moon, Jee-Young ; Louie, Tin L ; Jain, Deepti ; Sofer, Tamar ; Schurmann, Claudia ; Below, Jennifer E ; Lai, Chao-Qiang ; Aviles-Santa, M Larissa ; Talavera, Gregory A ; Smith, Caren E ; Petty, Lauren E ; Bottinger, Erwin P ; Chen, Yii-Der Ida ; Taylor, Kent D ; Daviglus, Martha L ; Cai, Jianwen ; Wang, Tao ; Tucker, Katherine L ; Ordovás, José M ; Hanis, Craig L ; Loos, Ruth JF ; Schneiderman, Neil ; Rotter, Jerome I ; Kaplan, Robert C ; Qi, Qibin |
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Zeitschrift: | Diabetes Care, Jg. 42 (2019-09-01), Heft 9 |
Veröffentlichung: | eScholarship, University of California, 2019 |
Medientyp: | academicJournal |
Umfang: | 1784 - 1791 |
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