Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco · 2011
Chromosome 20 shows linkage with DSM-IV nicotine dependence in Finnish adult smokers.
СтатьяПоддержка NIH: внешняя программаПоддержка исследования: вне правительства СШАНазвание и аннотация: Перевод пока не подготовлен
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Keskitalo-Vuokko Kaisu, Hällfors Jenni, Broms Ulla, Pergadia Michele L, Saccone Scott F, Loukola Anu, Madden Pamela A F, Kaprio Jaakko
Аннотация
INTRODUCTION: Chromosome 20 has previously been associated with nicotine dependence (ND) and smoking cessation. Our aim was to replicate and extend these findings.
METHODS: First, a total of 759 subjects belonging to 206 Finnish families were genotyped with 18 microsatellite markers residing on chromosome 20, in order to replicate previous linkage findings. Then, the replication data were combined to an existing whole-genome linkage data resulting in a total of 1,302 genotyped subjects from 357 families. ND diagnosed by DSM-IV criteria, the Fagerström Test for Nicotine Dependence (FTND) score, and the lifetime maximum number of cigarettes smoked within a 24-hr period (MaxCigs24) were used as phenotypes in the nonparametric linkage analyses.
RESULTS: We replicated previously reported linkage to DSM-IV ND, with a maximum logarithm of odd (LOD) score of 3.8 on 20p11, with females contributing more (maximum LOD [MLOD] score 3.4 on 20q11) than males (MLOD score 2.6 on 20p11). With the combined sample, a suggestive LOD score of 2.3 was observed for DSM-IV ND on 20p11. Sex-specific analyses revealed that the signal was driven by females with a maximum LOD score of 3.3 (on 20q11) versus LOD score of 1.3 in males (on 20q13) in the combined sample. No significant linkage signals were obtained for FTND or MaxCigs24.
CONCLUSIONS: Our results provide further evidence that chromosome 20 harbors genetic variants influencing ND in adult smokers.
METHODS: First, a total of 759 subjects belonging to 206 Finnish families were genotyped with 18 microsatellite markers residing on chromosome 20, in order to replicate previous linkage findings. Then, the replication data were combined to an existing whole-genome linkage data resulting in a total of 1,302 genotyped subjects from 357 families. ND diagnosed by DSM-IV criteria, the Fagerström Test for Nicotine Dependence (FTND) score, and the lifetime maximum number of cigarettes smoked within a 24-hr period (MaxCigs24) were used as phenotypes in the nonparametric linkage analyses.
RESULTS: We replicated previously reported linkage to DSM-IV ND, with a maximum logarithm of odd (LOD) score of 3.8 on 20p11, with females contributing more (maximum LOD [MLOD] score 3.4 on 20q11) than males (MLOD score 2.6 on 20p11). With the combined sample, a suggestive LOD score of 2.3 was observed for DSM-IV ND on 20p11. Sex-specific analyses revealed that the signal was driven by females with a maximum LOD score of 3.3 (on 20q11) versus LOD score of 1.3 in males (on 20q13) in the combined sample. No significant linkage signals were obtained for FTND or MaxCigs24.
CONCLUSIONS: Our results provide further evidence that chromosome 20 harbors genetic variants influencing ND in adult smokers.
Предметные рубрики MeSH
AdultAgedAged, 80 and overAllelesChromosomes, Human, Pair 20Data Interpretation, StatisticalDiagnostic and Statistical Manual of Mental DisordersFemaleFinlandGenetic LinkageGenetic Predisposition to DiseaseGenotypeHumansLod ScoreMaleMicrosatellite RepeatsMiddle AgedPhenotypeSex FactorsSmokingSmoking CessationTime FactorsTobacco Use DisorderWhite People