@article {6816,
	title = {Genetic contributions to variation in general cognitive function: a meta-analysis of genome-wide association studies in the CHARGE consortium (N=53949).},
	journal = {Mol Psychiatry},
	volume = {20},
	year = {2015},
	month = {2015 Feb},
	pages = {183-92},
	abstract = {<p>General cognitive function is substantially heritable across the human life course from adolescence to old age. We investigated the genetic contribution to variation in this important, health- and well-being-related trait in middle-aged and older adults. We conducted a meta-analysis of genome-wide association studies of 31 cohorts (N=53,949) in which the participants had undertaken multiple, diverse cognitive tests. A general cognitive function phenotype was tested for, and created in each cohort by principal component analysis. We report 13 genome-wide significant single-nucleotide polymorphism (SNP) associations in three genomic regions, 6q16.1, 14q12 and 19q13.32 (best SNP and closest gene, respectively: rs10457441, P=3.93 {\texttimes} 10(-9), MIR2113; rs17522122, P=2.55 {\texttimes} 10(-8), AKAP6; rs10119, P=5.67 {\texttimes} 10(-9), APOE/TOMM40). We report one gene-based significant association with the HMGN1 gene located on chromosome 21 (P=1 {\texttimes} 10(-6)). These genes have previously been associated with neuropsychiatric phenotypes. Meta-analysis results are consistent with a polygenic model of inheritance. To estimate SNP-based heritability, the genome-wide complex trait analysis procedure was applied to two large cohorts, the Atherosclerosis Risk in Communities Study (N=6617) and the Health and Retirement Study (N=5976). The proportion of phenotypic variation accounted for by all genotyped common SNPs was 29\% (s.e.=5\%) and 28\% (s.e.=7\%), respectively. Using polygenic prediction analysis, ~1.2\% of the variance in general cognitive function was predicted in the Generation Scotland cohort (N=5487; P=1.5 {\texttimes} 10(-17)). In hypothesis-driven tests, there was significant association between general cognitive function and four genes previously associated with Alzheimer{\textquoteright}s disease: TOMM40, APOE, ABCG1 and MEF2C.</p>},
	keywords = {Aged, Aged, 80 and over, Atherosclerosis, Cognition, Cognition Disorders, Cohort Studies, Female, Genetic Predisposition to Disease, Genome-Wide Association Study, HMGN1 Protein, Humans, Male, Middle Aged, Neuropsychological Tests, Phenotype, Polymorphism, Single Nucleotide, Scotland},
	issn = {1476-5578},
	doi = {10.1038/mp.2014.188},
	author = {Davies, G and Armstrong, N and Bis, J C and Bressler, J and Chouraki, V and Giddaluru, S and Hofer, E and Ibrahim-Verbaas, C A and Kirin, M and Lahti, J and van der Lee, S J and Le Hellard, S and Liu, T and Marioni, R E and Oldmeadow, C and Postmus, I and Smith, A V and Smith, J A and Thalamuthu, A and Thomson, R and Vitart, V and Wang, J and Yu, L and Zgaga, L and Zhao, W and Boxall, R and Harris, S E and Hill, W D and Liewald, D C and Luciano, M and Adams, H and Ames, D and Amin, N and Amouyel, P and Assareh, A A and Au, R and Becker, J T and Beiser, A and Berr, C and Bertram, L and Boerwinkle, E and Buckley, B M and Campbell, H and Corley, J and De Jager, P L and Dufouil, C and Eriksson, J G and Espeseth, T and Faul, J D and Ford, I and Gottesman, R F and Griswold, M E and Gudnason, V and Harris, T B and Heiss, G and Hofman, A and Holliday, E G and Huffman, J and Kardia, S L R and Kochan, N and Knopman, D S and Kwok, J B and Lambert, J-C and Lee, T and Li, G and Li, S-C and Loitfelder, M and Lopez, O L and Lundervold, A J and Lundqvist, A and Mather, K A and Mirza, S S and Nyberg, L and Oostra, B A and Palotie, A and Papenberg, G and Pattie, A and Petrovic, K and Polasek, O and Psaty, B M and Redmond, P and Reppermund, S and Rotter, J I and Schmidt, H and Schuur, M and Schofield, P W and Scott, R J and Steen, V M and Stott, D J and van Swieten, J C and Taylor, K D and Trollor, J and Trompet, S and Uitterlinden, A G and Weinstein, G and Widen, E and Windham, B G and Jukema, J W and Wright, A F and Wright, M J and Yang, Q and Amieva, H and Attia, J R and Bennett, D A and Brodaty, H and de Craen, A J M and Hayward, C and Ikram, M A and Lindenberger, U and Nilsson, L-G and Porteous, D J and R{\"a}ikk{\"o}nen, K and Reinvang, I and Rudan, I and Sachdev, P S and Schmidt, R and Schofield, P R and Srikanth, V and Starr, J M and Turner, S T and Weir, D R and Wilson, J F and van Duijn, C and Launer, L and Fitzpatrick, A L and Seshadri, S and Mosley, T H and Deary, I J}
}
@article {6799,
	title = {GWAS for executive function and processing speed suggests involvement of the CADM2 gene.},
	journal = {Mol Psychiatry},
	volume = {21},
	year = {2016},
	month = {2016 Feb},
	pages = {189-97},
	abstract = {<p>To identify common variants contributing to normal variation in two specific domains of cognitive functioning, we conducted a genome-wide association study (GWAS) of executive functioning and information processing speed in non-demented older adults from the CHARGE (Cohorts for Heart and Aging Research in Genomic Epidemiology) consortium. Neuropsychological testing was available for 5429-32,070 subjects of European ancestry aged 45 years or older, free of dementia and clinical stroke at the time of cognitive testing from 20 cohorts in the discovery phase. We analyzed performance on the Trail Making Test parts A and B, the Letter Digit Substitution Test (LDST), the Digit Symbol Substitution Task (DSST), semantic and phonemic fluency tests, and the Stroop Color and Word Test. Replication was sought in 1311-21860 subjects from 20 independent cohorts. A significant association was observed in the discovery cohorts for the single-nucleotide polymorphism (SNP) rs17518584 (discovery P-value=3.12 {\texttimes} 10(-8)) and in the joint discovery and replication meta-analysis (P-value=3.28 {\texttimes} 10(-9) after adjustment for age, gender and education) in an intron of the gene cell adhesion molecule 2 (CADM2) for performance on the LDST/DSST. Rs17518584 is located about 170 kb upstream of the transcription start site of the major transcript for the CADM2 gene, but is within an intron of a variant transcript that includes an alternative first exon. The variant is associated with expression of CADM2 in the cingulate cortex (P-value=4 {\texttimes} 10(-4)). The protein encoded by CADM2 is involved in glutamate signaling (P-value=7.22 {\texttimes} 10(-15)), gamma-aminobutyric acid (GABA) transport (P-value=1.36 {\texttimes} 10(-11)) and neuron cell-cell adhesion (P-value=1.48 {\texttimes} 10(-13)). Our findings suggest that genetic variation in the CADM2 gene is associated with individual differences in information processing speed.</p>},
	issn = {1476-5578},
	doi = {10.1038/mp.2015.37},
	author = {Ibrahim-Verbaas, C A and Bressler, J and Debette, S and Schuur, M and Smith, A V and Bis, J C and Davies, G and Trompet, S and Smith, J A and Wolf, C and Chibnik, L B and Liu, Y and Vitart, V and Kirin, M and Petrovic, K and Polasek, O and Zgaga, L and Fawns-Ritchie, C and Hoffmann, P and Karjalainen, J and Lahti, J and Llewellyn, D J and Schmidt, C O and Mather, K A and Chouraki, V and Sun, Q and Resnick, S M and Rose, L M and Oldmeadow, C and Stewart, M and Smith, B H and Gudnason, V and Yang, Q and Mirza, S S and Jukema, J W and deJager, P L and Harris, T B and Liewald, D C and Amin, N and Coker, L H and Stegle, O and Lopez, O L and Schmidt, R and Teumer, A and Ford, I and Karbalai, N and Becker, J T and Jonsdottir, M K and Au, R and Fehrmann, R S N and Herms, S and Nalls, M and Zhao, W and Turner, S T and Yaffe, K and Lohman, K and van Swieten, J C and Kardia, S L R and Knopman, D S and Meeks, W M and Heiss, G and Holliday, E G and Schofield, P W and Tanaka, T and Stott, D J and Wang, J and Ridker, P and Gow, A J and Pattie, A and Starr, J M and Hocking, L J and Armstrong, N J and McLachlan, S and Shulman, J M and Pilling, L C and Eiriksdottir, G and Scott, R J and Kochan, N A and Palotie, A and Hsieh, Y-C and Eriksson, J G and Penman, A and Gottesman, R F and Oostra, B A and Yu, L and DeStefano, A L and Beiser, A and Garcia, M and Rotter, J I and N{\"o}then, M M and Hofman, A and Slagboom, P E and Westendorp, R G J and Buckley, B M and Wolf, P A and Uitterlinden, A G and Psaty, B M and Grabe, H J and Bandinelli, S and Chasman, D I and Grodstein, F and R{\"a}ikk{\"o}nen, K and Lambert, J-C and Porteous, D J and Price, J F and Sachdev, P S and Ferrucci, L and Attia, J R and Rudan, I and Hayward, C and Wright, A F and Wilson, J F and Cichon, S and Franke, L and Schmidt, H and Ding, J and de Craen, A J M and Fornage, M and Bennett, D A and Deary, I J and Ikram, M A and Launer, L J and Fitzpatrick, A L and Seshadri, S and van Duijn, C M and Mosley, T H}
}
