Dermatoglyphs of Klinefelter's syndrome.
The dermatoglyphs of 28 Japanese with Klinefelter's syndrome [24 XXY; 2 XXYY; 1 XXXY; 1 XXXXY] were compared with 544 male and 129 female controls. These patients showed high frequencies of fingertip arches pattern, right third interdigital loops, right hypothenar patterns (Lr) and  line C terminating 0 in the right hand. The mean summed a-b ridge count of Klinefelter's syndrome patients was significantly lower than that of the male controls. We suggest that an increase in the number of X or Y chromosomes decreased the a-b ridge count in a similar way to the decrease in total finger ridge count.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D003878:Dermatoglyphics; D006801:Humans; D007564:Japan; D007713:Klinefelter Syndrome / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D012730:Sex Chromosomes