Race, APOL1 Risk Variants, and Clinical Outcomes among Older Adults: The ARIC Study.

TitleRace, APOL1 Risk Variants, and Clinical Outcomes among Older Adults: The ARIC Study.
Publication TypeJournal Article
Year of Publication2020
AuthorsChen TK, Coresh JJ, Daya N, Ballew SH, Tin A, Crews DC
Secondary AuthorsGrams ME
JournalJ Am Geriatr Soc
Date Published2020 Sep 07
ISSN1532-5415
Abstract

BACKGROUND/OBJECTIVES: APOL1 high-risk genotypes confer an increased risk for kidney disease, but their clinical significance among older adults remains unclear. We aimed to determine whether APOL1 genotype status (high risk = 2 risk alleles; low risk = 0-1 risk alleles) and self-reported race (Black; White) are associated with number of hospitalizations, incident chronic kidney disease (CKD), end-stage renal disease (ESRD), and mortality among older adults participating in a community-based cohort study.

DESIGN: Observational longitudinal cohort study.

SETTING: The Atherosclerosis Risk in Communities (ARIC) study.

PARTICIPANTS: Community-dwelling older adults (mean age = 75.8 years; range = 66-90 years).

RESULTS: Among 5,564 ARIC participants (78.2% White, 19.1% APOL1 low-risk Black, and 2.7% APOL1 high-risk Black), the proportion with creatinine and cystatin C-based estimated glomerular filtration rate (eGFR ) below 60 mL/min/1.73 m at baseline was 40.6%, 34.8%, and 43.2%, respectively. Over a mean follow-up of 5.1 years, APOL1 high-risk Blacks had a 2.67-fold higher risk for ESRD compared with low-risk Blacks (95% confidence interval [CI] = 1.05-6.79) in models adjusted for age and sex. This association was no longer significant upon further adjustment for baseline eGFR and albuminuria (hazard ratio [HR] = 1.08; 95% CI = .39-2.96). Rate of hospitalizations and risks of mortality and incident CKD did not differ significantly by APOL1 genotype status. Compared with Whites, Blacks had 1.85-fold and 3.45-fold higher risks for incident CKD and ESRD, respectively, in models adjusted for age, sex, eGFR , and albuminuria. These associations persisted after additional adjustments for clinical/socioeconomic factors and APOL1 genotype (incident CKD: HR = 1.38; 95% CI = 1.06-1.81; ESRD: HR = 3.20; 95% CI = 1.16-8.86).

CONCLUSION: Among older Black adults, APOL1 high-risk genotypes were associated with lower kidney function and therefore higher risk of ESRD. Racial disparities in incident kidney disease persisted in older age and were not fully explained by APOL1.

DOI10.1111/jgs.16797
Alternate JournalJ Am Geriatr Soc
PubMed ID32894582
Grant ListClinician Scientist Career Development Award / / Johns Hopkins University /
HHSN268201700001I / HL / NHLBI NIH HHS / United States
HHSN268201700002I / HL / NHLBI NIH HHS / United States
HHSN268201700003I / HL / NHLBI NIH HHS / United States
HHSN268201700004I / HL / NHLBI NIH HHS / United States
HHSN268201700005I / HL / NHLBI NIH HHS / United States
K08DK117068 / DK / NIDDK NIH HHS / United States
R01DK089174 / DK / NIDDK NIH HHS / United States
R01DK108803 / DK / NIDDK NIH HHS / United States
Under Award Number NIDDK P30DK079310 / / Yale University /