make money online Mapping the Genome: Y Haplogroups and Aggressive Behavior

Tuesday, September 28, 2010

Y Haplogroups and Aggressive Behavior

Below is the abstract of an interesting article about the possible association between y-chromosome haplogroups and aggressive behavior.  Intriguingly, haplogroups R1a1 and R2 were shown to have a medium and significantly lower aggression score then haplogroups H,L and J respectively .  
Y Haplogroups and Aggressive Behavior in a Pakistani Ethnic Group
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Studies show that personality dimensions such as aggression are influenced by genetic factors and that allelic variants located on the Y chromosome influence such behavior. We investigated polymorphisms on the male-specific region of the human Y chromosome in 156 unrelated males from the same ethnic background, who were administered the Punjabi translation of the Buss and Perry Aggression Questionnaire that measures four aspects that constitute aggressive behavior, i.e. physical aggression, verbal
aggression, anger, and hostility. A value of .85 for Cronbach’s coefficient a indicates considerable internal consistency and suggests that the psychometric properties of the aggression questionnaire can be adapted for the Pakistani population. A mean score7SD of 69.70719.95 was obtained for the questionnaire. Each individual was genotyped following a phylogenetic hierarchical approach
to define evolutionary Y haplogroups. Five Y haplogroups that are commonly found in Eurasia and Pakistan comprised 87% (n5136) of the population sample, with one haplogroup, R1a1, constituting 55% of the sampled population. A comparison of the total and four subscale mean scores across the five common Y haplogroups that were present at a frequency Z3% in this ethnic
group revealed no overall significant differences. However, effect-size comparisons allowed us to detect an association of the haplogroups R2 (Cohen’s d statistic5.448–.732) and R1a1 (d5.107–.448) with lower self-reported aggression mean scores in this population. Aggr. Behav. 35:68–74, 2009. r 2008 Wiley-Liss, Inc.

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