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Browsing by Subject "Cognitive functioning"
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Item Genetic architecture of age-related cognitive decline in African Americans(American Academy of Neurology, 2016-12-21) Raj, Towfique; Chibnik, Lori B.; McCabe, Cristin; Wong, Andus; Replogle, Joseph M.; Yu, Lei; Gao, Sujuan; Unverzagt, Frederick W.; Stranger, Barbara; Murrell, Jill; Barnes, Lisa; Hendrie, Hugh C.; Foroud, Tatiana; Krichevsky, Anna; Bennett, David A.; Hall, Kathleen S.; Evans, Denis A.; De Jager, Philip L.; Department of Biostatistics, Richard M. Fairbanks School of Public HealthOBJECTIVE: To identify genetic risk factors associated with susceptibility to age-related cognitive decline in African Americans (AAs). METHODS: We performed a genome-wide association study (GWAS) and an admixture-mapping scan in 3,964 older AAs from 5 longitudinal cohorts; for each participant, we calculated a slope of an individual's global cognitive change from neuropsychological evaluations. We also performed a pathway-based analysis of the age-related cognitive decline GWAS. RESULTS: We found no evidence to support the existence of a genomic region which has a strongly different contribution to age-related cognitive decline in African and European genomes. Known Alzheimer disease (AD) susceptibility variants in the ABCA7 and MS4A loci do influence this trait in AAs. Of interest, our pathway-based analyses returned statistically significant results highlighting a shared risk from lipid/metabolism and protein tyrosine signaling pathways between cognitive decline and AD, but the role of inflammatory pathways is polarized, being limited to AD susceptibility. CONCLUSIONS: The genetic architecture of aging-related cognitive in AA individuals is largely similar to that of individuals of European descent. In both populations, we note a surprising lack of enrichment for immune pathways in the genetic risk for cognitive decline, despite strong enrichment of these pathways among genetic risk factors for AD.Item Postnatal Depressive Symptoms Among Mothers and Fathers of Infants Born Preterm: Prevalence and Impacts on Children's Early Cognitive Function(Wolters Kluwer, 2016-01) Cheng, Erika R.; Kotelchuck, Milton; Gerstein, Emily D.; Taveras, Elsie M.; Poehlmann-Tynan, Julie; Department of Pediatrics, IU School of MedicineOBJECTIVE: Preterm birth is associated with lower cognitive functioning. One potential pathway is postnatal parental depression. The authors assessed depressive symptoms in mothers and fathers after preterm birth, and identified the impacts of both prematurity and parental depressive symptoms on children's early cognitive function. METHOD: Data were from the nationally representative Early Childhood Longitudinal Study, Birth Cohort (n = 5350). Depressive symptoms at 9 months were assessed by the Center for Epidemiologic Studies Depression Scale (CESD) and children's cognitive function at 24 months by the Bayley Short Form, Research Edition. Weighted generalized estimating equation models examined the extent to which preterm birth, and mothers' and fathers' postnatal depressive symptoms impacted children's cognitive function at 24 months, and whether the association between preterm birth and 24-month cognitive function was mediated by parental depressive symptoms. RESULTS: At 9 months, fathers of very preterm (<32 weeks gestation) and moderate/late preterm (32-37 weeks gestation) infants had higher CESD scores than fathers of term-born (≥37 weeks gestation) infants (p value = .02); preterm birth was not associated with maternal depressive symptoms. In multivariable analyses, preterm birth was associated with lower cognitive function at 24 months; this association was unaffected by adjustment for parental depressive symptoms. Fathers', but not mothers', postnatal depressive symptoms predicted lower cognitive function in the fully adjusted model (β = -0.11, 95% confidence interval, -0.18 to -0.03). CONCLUSION: Fathers of preterm infants have more postnatal depressive symptomology than fathers of term-born infants. Fathers' depressive symptoms also negatively impact children's early cognitive function. The national findings support early identification and treatment of fathers of preterm infants with depressive symptoms.