Digit ratio (2D:4D), ABO blood type, and the Rhesus factor.
Twin and family study findings indicate a substantial heritability of digit ratio (2D:4D), a putative marker for the masculinizing effects of prenatal androgen exposure. Functional polymorphisms of the X-linked androgen receptor gene, i.e., androgen sensitivity, contribute somewhat to the expression of 2D:4D in men, but otherwise the genetics of 2D:4D is unknown. This study investigated differences in 2D:4D by self-reported ABO blood type and Rhesus factor, two easily collectible genetic traits, in two samples (combined N=1273). Effects of blood groups on 2D:4D were small and not significant in all tests in both samples; however, two consistent patterns emerged across samples. Of the ABO types, AB had the lowest right-hand 2D:4D, the highest left-hand 2D:4D, and the lowest right-minus-left difference in 2D:4D, and Rhesus factor Rh- had higher left-hand 2D:4D and lower right-minus-left difference in 2D:4D than Rh+. If replicable, this may suggest genes contributing to the expression of 2D:4D reside in the vicinity of the gene loci (chromosomal locations: 9q34.2 and 1p36.11) of these blood groups or pleiotropic effects of the blood-group genes.
Voracek
Martin
M
Department of Basic Psychological Research, School of Psychology, University of Vienna, Liebiggasse 5, 03-46, A-1010 Vienna, Austria. martin.voracek@univie.ac.at
D000017:ABO Blood-Group System; D000293:Adolescent; D000328:Adult; D000368:Aged; D000886:Anthropometry; D005260:Female; D005385:Fingers / Q000033:anatomy & histology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012204:Rh-Hr Blood-Group System; D055815:Young Adult
D000017:ABO Blood-Group System; D012204:Rh-Hr Blood-Group System