Health Disparities Research Section

Michele K Evans , MD
Chief, Health Disparities Research Section
Laboratory of Epidemiology and Population Sciences

Nicole Noren Hooten , Ph.D. Staff Scientist

Ngozi Ezike , M.D., Staff Clinician HANDLS

May Baydoun , Ph.D., Staff Scientist

Jennifer H. Norbeck , MSW., CCRC Clinical Study Manager

The Health Disparities Research Section (HDRS) conducts interdisciplinary clinical and basic science research examining the biologic transduction pathways through which the social determinants of health contribute to the disproportionate incidence, morbidity, and mortality of age-related disease among minority and low socioeconomic status (SES) Americans. The approach provides a two-way bridge between basic science laboratory studies and clinical and behavioral research that spans from a targeted epidemiologic population to the bench. Dissecting the interaction of race, socioeconomic status, behavior, environmental exposure, genetics, and social environment provides insight into how these interactions may result in disparate rates of age-related disease and disability. We have accomplished this by establishing a clinical component, the Healthy Aging in Neighborhoods of Diversity across the Life Span Study (HANDLS) https://handls.nih.gov/ and a basic science laboratory component, the DNA Repair Unit, that are interdependent and pursuing related hypotheses. The HANDLS study investigates whether race and SES influence health status and age-related health disparities separately or synergistically as co-factors of behavioral, psychosocial, and environmental conditions. HANDLS is a community -based, epidemiologic, interdisciplinary, longitudinal study. Our baseline cohort recruited between 2004-2009 was representative of working-age African Americans and Whites between 30–64 years old recruited as a fixed cohort of participants by household screenings from an area probability sample of thirteen neighborhoods (contiguous census tracts) in Baltimore City beginning. The research domains include: cognitive function, nutrition, neighborhood environment, anthropometry, cardiovascular health, physical performance, molecular markers, genetics and genomics, nephrology, neuroimaging, vision, and psychology.

List of Portfolio/Research Areas

  • Longitudinal trajectories of health disparities
  • Social determinants of health
  • oxidative stress
  • inflammation
  • genomics
  • nutrition
  • aging
  • biomarkers
  • discrimination
  • Age-associated cognitive function
  • Behavioral risk factors for morbidity & mortality

Findings and Publications

Byappanahalli AM, Omoniyi V, Noren Hooten N, Smith JT, Mode NA, Ezike N, Zonderman AB, Evans MK. Extracellular vesicle mitochondrial DNA levels are associated with race and mitochondrial DNA haplogroup. iScience. 2024;27(1):108724. PMCID: PMC10788249.

Shen B, Mode NA, Noren Hooten N, Pacheco NL, Ezike N, Zonderman AB, Evans MK. Association of race and poverty status with DNA methylation-based age. JAMA Network Open. 2023;6(4):e236340. PMCID: PMC10082406.

Byappanahalli AM, Noren Hooten N, Vannoy M, Mode NA, Ezike N, Zonderman AB, Evans MK. Mitochondrial DNA and inflammatory proteins are higher in extracellular vesicles from frail individuals. Immunity & Ageing. 2023;20(1):6. PMCID: PMC9885591.

Smith JT, Noren Hooten N, Mode NA, Zonderman AB, Ezike N, Kaushal S, Evans MK. Frailty, sex, and poverty are associated with DNA damage and repair in frail, middle-aged urban adults. DNA Repair (Amst). 2023;129:103530.

Pacheco NL, Noren Hooten N, Zhang Y, Prince CS, Mode NA, Ezike N, Becker KG, Zonderman AB, Evans MK. Sex-specific transcriptome differences in a middle-aged frailty cohort. BMC Geriatrics. BMC Geriatrics. 2022;22(1):651. PMCID: PMC9361278.

Shen B, Hernandez DG, Chitrala KN, Fanelli-Kuczmarski MT, Noren Hooten N, Pacheco NL, Mode NA, Zonderman AB, Ezike N, Evans MK. APOE gene region methylation is associated with cognitive performance in middle-aged urban adults. Neurobiology of Aging. 2022;116:41-48.

Lazo S, Noren Hooten N, Green J, Eitan E, Mode NA, Liu QR, Zonderman AB, Ezike N, Mattson MP, Ghosh P, Evans MK. Mitochondrial DNA in extracellular vesicles declines with age. Aging Cell. 2021;20(1):e13283.