title: A role for HLA-DRB1*1101 and DRB1*0801 in cognitive ability and its decline with age.
abstract: Cognitive abilities (memory, processing speed, vocabulary, and fluid intelligence) are correlated with educational attainment and occupational status, as well as physical and mental health. The variation in cognitive abilities observed within a population has a substantial genetic contribution (heritability ∼50%) and yet the identification of genetic polymorphisms from both genome-wide association and candidate studies have to date only uncovered a limited number of genetic variants that exert small genetic effects. Here we impute human leukocyte antigens (HLA) using existing genome-wide association data from 1,559 non-pathological elderly volunteers who have been followed for changes in cognitive functioning between a 12- and 18-year period. Specifically, we investigate DRB1*05 (*11/*12) and DRB1*01, which have previously been associated with cognitive ability. We also analyze DRB1*0801, which shares close sequence homology with DRB1*1101. Together with DRB1*1101, DRB1*0801 has been associated with several diseases including multiple sclerosis and primary biliary cirrhosis, which themselves are associated with cognitive impairment. We observed that both DRB1*0801 and DRB1*1101 were significantly associated with vocabulary ability (cross-sectional and longitudinal scores) and that the effects were in opposite directions with DRB1*0801 associated with lower score and faster decline. This opposing affect is similar to that reported by other groups in systemic lupus erythematosus, type 1 diabetes, and primary biliary cirrhosis. DRB1*0801 was also significantly associated with reduced memory ability. We observed no associations between cognitive abilities and DRB1*01 or DRB1*12.
authors.affiliation: Centre for Integrated Genomic Medical Research, The University of Manchester, Manchester, UK.|Human Communication and Deafness, School of Psychological Sciences, The University of Manchester, Manchester, UK.
authors.forename: Antony
authors.initials: A
authors.lastname: Payton
authors.affiliation: Human Communication and Deafness, School of Psychological Sciences, The University of Manchester, Manchester, UK.
authors.forename: Piers
authors.initials: P
authors.lastname: Dawes
authors.affiliation: Centre for Integrated Genomic Medical Research, The University of Manchester, Manchester, UK.
authors.forename: Hazel
authors.initials: H
authors.lastname: Platt
authors.affiliation: Human Communication and Deafness, School of Psychological Sciences, The University of Manchester, Manchester, UK.|Departments of Obstetrics, Gynecology and Reproductive Biology and Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.|Broad Institute of MIT and Harvard, Cambridge, Massachusetts.
authors.forename: Cynthia C
authors.initials: CC
authors.lastname: Morton
authors.affiliation: Human Communication and Deafness, School of Psychological Sciences, The University of Manchester, Manchester, UK.
authors.forename: David R
authors.initials: DR
authors.lastname: Moore
authors.affiliation: Arthritis Research UK Centre for Genetics and Genomics, Musculoskeletal Research Group, The University of Manchester, Manchester, UK.
authors.forename: Jonathan
authors.initials: J
authors.lastname: Massey
authors.affiliation: Centre for Clinical and Cognitive Neuroscience, Institute of Brain Behaviour and Mental Health, Salford Royal NHS Hospital, The University of Manchester, Manchester, UK.
authors.forename: Michael
authors.initials: M
authors.lastname: Horan
authors.affiliation: Centre for Integrated Genomic Medical Research, The University of Manchester, Manchester, UK.
authors.forename: William
authors.initials: W
authors.lastname: Ollier
authors.affiliation: Human Communication and Deafness, School of Psychological Sciences, The University of Manchester, Manchester, UK.
authors.forename: Kevin J
authors.initials: KJ
authors.lastname: Munro
authors.affiliation: Centre for Clinical and Cognitive Neuroscience, Institute of Brain Behaviour and Mental Health, Salford Royal NHS Hospital, The University of Manchester, Manchester, UK.
authors.forename: Neil
authors.initials: N
authors.lastname: Pendleton
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000235:genetics*; D003071:Cognition; D003072:Cognition Disorders / Q000235:genetics*; D005260:Female; D059811:HLA-DRB1 Chains / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012044:Regression Analysis
chemical_list: D059811:HLA-DRB1 Chains; C466440:HLA-DRB1*08:01 antigen
keywords: HLA; association; cognition; genetics