Apolipoprotein L1, income and early kidney damage

作者：Tamrat Ruth; Peralta Carmen A; Tajuddin Salman M; Evans Michele K; Zonderman Alan B; Crews Deidra C^*

来源：BMC Nephrology, 2015, 16(1): 14.

DOI：10.1186/s12882-015-0008-6

• APOL1
• Chronic kidney disease
• Socioeconomic status
• African American
• Renal
• Albuminuria

Background: The degree to which genetic or environmental factors are associated with early kidney damage among African Americans (AAs) is unknown.
Methods: Among 462 AAs in the Healthy Aging in Neighborhoods of Diversity across the Life Span (HANDLS) study, we examined the cross-sectional association between apolipoprotein L1 (APOL1) risk variants and income with: 1) mildly reduced eGFR (<75 mL/min/1.73 m(2), creatinine-cystatin C equation) and 2) elevated urine albumin-to-creatinine ratio (ACR) (>= 17 in men and >= 25 mg/g in women). High risk APOL1 status was defined by 2 copies of high-risk variants; low risk if 0 or 1 copy. Income groups were dichotomized as < $ 14,000/year (lowest income group) or >= $ 14,000/year. Logistic regression models were adjusted for age, sex, and % European ancestry.
Results: Overall, participants' mean age was 47 years and 16% (n = 73) had high risk APOL1 status. Mean eGFR was 99 mL/min/1.73 m(2). Mildly reduced eGFR was prevalent among 11% (n = 51). The lowest income group had higher adjusted odds (aOR) of mildly reduced eGFR than the higher income group (aOR 1.8, 95% CI 1.2-2.7). High-risk APOL1 was not significantly associated with reduced eGFR (aOR 1.5, 95% CI 0.9-2.5). Among 301 participants with ACR data, 7% (n = 21) had elevated ACR. Compared to low-risk, persons with high-risk APOL1 had higher odds of elevated ACR (aOR 3.8, 95% CI 2.0-7.3). Income was not significantly associated with elevated ACR (aOR 1.8, 95% CI 0.7-4.5). There were no significant interactions between APOL1 and income.
Conclusions: Both genetic and socioeconomic factors may be important determinants of early kidney damage among AAs.

• 出版日期2015-2-10