No evidence that polymorphisms of brain regulator genes Microcephalin and ASPM are associated with general mental ability, head circumference or altruism.
We test the hypothesis that polymorphisms of the brain regulator genes MCPH1 and ASPM contribute to variations in human brain size and its correlates. We measured general mental ability, head circumference and social intelligence in 644 Canadian adults (496 Caucasians, 36 Orientals, 84 Mixed Race/Other and 28 Blacks; 257 men and 387 women). The gene polymorphisms were assessed from buccal DNA; mental ability by Wonderlic Personnel Test and Multidimensional Aptitude Battery; head circumference by stretchless tape; and social intelligence by prosocial attitude questionnaires. Although all measures were construct valid and the allele frequencies showed expected population differences, no relationship was found between the genes and any of the criteria. Among Caucasian 18-25 year olds, for example, the two mental ability tests correlated with each other (r=0.78, N=476, p<0.001), with head circumference (r=0.17, N=182, p<0.05) and with prosocial attitudes (r=0.23, N=182, p<0.001).
Rushton
J Philippe
JP
The University of Western Ontario, Ontario, Canada N6A 3C2. rushton@uwo.ca
Vernon
Philip A
PA
Bons
Trudy Ann
TA
D000293:Adolescent; D000328:Adult; D000533:Altruism; D018797:Cell Cycle Proteins; D003598:Cytoskeletal Proteins; D005260:Female; D005787:Gene Frequency; D006257:Head / Q000033:anatomy & histology; D006801:Humans; D007360:Intelligence / Q000235:genetics*; D008297:Male; D009419:Nerve Tissue Proteins / Q000235:genetics*; D011110:Polymorphism, Genetic / Q000502:physiology*; D044469:Racial Groups / Q000235:genetics
C467202:ASPM protein, human; D018797:Cell Cycle Proteins; D003598:Cytoskeletal Proteins; C460645:MCPH1 protein, human; D009419:Nerve Tissue Proteins