The Colton blood group locus

Abstract
Accumulated family information was compiled in an attempt to verify the chromosomal location of the Colton blood group locus (CO). Two‐point linkage analysis of CO and 46 other polymorphic loci excludes CO from 1p36 to 1q23, 3q21 to 3q26, 4q13 to 4q28, 6p24 to 6 cen, and 19p13.2 to 19 cen and from linkage groups bounded by ABO and ORM, PI and IGHG, and HP and GOT2. The dwindling odds of linkage between CO:JK are reinforced (z =−5.28 at theta = 0.20). Close linkage of CO with ACP1 and D2S5 could not be demonstrated. The proposed chromosome 2 location of CO is therefore questioned.