Bipolar disorder risk alleles in children with ADHD

TY - JOUR

T1 - Bipolar disorder risk alleles in children with ADHD

AU - Schimmelmann, B G

AU - Hinney, A

AU - Scherag, A

AU - Pütter, C

AU - Pechlivanis, S

AU - Cichon, S

AU - Jöckel, K-H

AU - Schreiber, S

AU - Wichmann, H E

AU - Albayrak, Ö

AU - Dauvermann, M

AU - Konrad, K

AU - Wilhelm, C

AU - Herpertz-Dahlmann, B

AU - Lehmkuhl, G

AU - Sinzig, J

AU - Renner, T J

AU - Romanos, M

AU - Warnke, A

AU - Lesch, K P

AU - Reif, A

AU - Hebebrand, J

PY - 2013/11

Y1 - 2013/11

N2 - Bipolar disorder (BD) and attention deficit/hyperactivity disorder (ADHD) may share common genetic risk factors as indicated by the high co-morbidity of BD and ADHD, their phenotypic overlap especially in pediatric populations, the high heritability of both disorders, and the co-occurrence in families. We therefore examined whether known polygenic BD risk alleles are associated with ADHD. We chose the eight best SNPs of the recent genome-wide association study (GWAS) of BD patients of German ancestry and the nine SNPs from international GWAS meeting a 'genome-wide significance' level of α = 5 × 10(-8). A GWAS was performed in 495 ADHD children and 1,300 population-based controls using HumanHap550v3 and Human660 W-Quadv1 BeadArrays. We found no significant association of childhood ADHD with single BD risk alleles surviving adjustment for multiple testing. Yet, risk alleles for BD and ADHD were directionally consistent at eight of nine loci with the strongest support for three SNPs in or near NCAN, BRE, and LMAN2L. The polygene analysis for the BP risk alleles at all 14 loci indicated a higher probability of being a BD risk allele carrier in the ADHD cases as compared to the controls. At a moderate power to detect association with ADHD, if true effects were close to estimates from GWAS for BD, our results suggest that the possible contribution of BD risk variants to childhood ADHD risk is considerably lower than for BD. Yet, our findings should encourage researchers to search for common genetic risk factors in BD and childhood ADHD in future studies.

AB - Bipolar disorder (BD) and attention deficit/hyperactivity disorder (ADHD) may share common genetic risk factors as indicated by the high co-morbidity of BD and ADHD, their phenotypic overlap especially in pediatric populations, the high heritability of both disorders, and the co-occurrence in families. We therefore examined whether known polygenic BD risk alleles are associated with ADHD. We chose the eight best SNPs of the recent genome-wide association study (GWAS) of BD patients of German ancestry and the nine SNPs from international GWAS meeting a 'genome-wide significance' level of α = 5 × 10(-8). A GWAS was performed in 495 ADHD children and 1,300 population-based controls using HumanHap550v3 and Human660 W-Quadv1 BeadArrays. We found no significant association of childhood ADHD with single BD risk alleles surviving adjustment for multiple testing. Yet, risk alleles for BD and ADHD were directionally consistent at eight of nine loci with the strongest support for three SNPs in or near NCAN, BRE, and LMAN2L. The polygene analysis for the BP risk alleles at all 14 loci indicated a higher probability of being a BD risk allele carrier in the ADHD cases as compared to the controls. At a moderate power to detect association with ADHD, if true effects were close to estimates from GWAS for BD, our results suggest that the possible contribution of BD risk variants to childhood ADHD risk is considerably lower than for BD. Yet, our findings should encourage researchers to search for common genetic risk factors in BD and childhood ADHD in future studies.

KW - Adolescent

KW - Alleles

KW - Attention Deficit Disorder with Hyperactivity/complications

KW - Bipolar Disorder/complications

KW - Child

KW - European Continental Ancestry Group/genetics

KW - Female

KW - Genetic Predisposition to Disease

KW - Genome-Wide Association Study

KW - Haplotypes

KW - Humans

KW - Male

KW - Polymorphism, Single Nucleotide

U2 - 10.1007/s00702-013-1035-8

DO - 10.1007/s00702-013-1035-8

M3 - Article

C2 - 23712748

SN - 0300-9564

VL - 120

SP - 1611

EP - 1617

JO - Journal of neural transmission (Vienna, Austria : 1996)

JF - Journal of neural transmission (Vienna, Austria : 1996)

IS - 11

ER -