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Concordance of reactions of Wu+ and 'Hov'+ cells with 153 sera containing multiple specificities to low-incidence antigens indicates that the 'two' antigens are identical. This conclusion is confirmed by absorption and elution studies.

Family studies have provided the final piece of evidence for the assignment of Auberger to the Lutheran blood group system. Lods derived from combined paternal and maternal meioses (zeta = 10.83 at theta = 0.00) strongly support the contention that a single gene controls the expression of both Au and LU antigens. Consequently, the International Society of Blood Transfusion Working Party on Terminology has designated Aua and Aub as LU18 and LU19, respectively.

In an attempt to assign the Colton blood group locus (CO) we have successfully revisited chromosome 7. CO is linked to the argininosuccinate synthetase pseudogene 11 locus (ASSP11) with z = 5.79 at theta = 0.07 for combined paternal and maternal meioses. We propose a 7p position for CO.

DNA from a series of families segregating for Aub was analyzed with a genomic DNA probe which defines a Bg1 I polymorphism for apolipoprotein C II (APOC2). The investigation revealed that the gene for Aub is closely linked to APOC2 (z = 8.43 at theta = 0.00) for paternal and maternal meioses combined, to LW (z = 3.61 at theta = 0.00) in paternal meioses and less closely linked to SE (z = 3.10 at theta = 0.09) for combined paternal and maternal meioses. Therefore, we propose a chromosome 19 location for the Aub gene.

A case of mild hemolytic disease of the newborn is presented which was caused by an antibody to a hitherto unknown antigen of low incidence. This antigen, now designated as HOFM (ISBT number 700050) was detected in 6 relatives, and in all of them, it was associated with an unusually weakened expression of C antigen. The serological data indicate that HOFM may be part of the Rh system, but the genetic data, although supportive of this interpretation, are inconclusive.

No recombinants between LW and C3, using a C3 DNA probe, were observed in 16 female meioses: z 4.216 at theta = 0.00. Combined with the data of Sistonen (1984) the recombination fraction between LW and C3 is estimated to be 0.09 (z 3.773) in females.

Data are presented on 30 high and low incidence antigens and on the distribution of the alleles of 14 blood group systems in a random sample of Newfoundlanders. The distribution of alleles in Newfoundland was compared to founder populations where possible and to the Canadian Caucasian population in general; no significant differences were found. Six rare alleles were observed (IN*a, NFLD, TAR, RH*x, RH*w, RH*V) in a population of 234 individuals. A high incidence of rare alleles has been reported in other isolate populations.

Cytogenetic, enzyme dosage, serological, and electrophoretic analyses of blood samples from members of three Newfoundland kindreds in which one specific paracentric insertion chromosome inv ins(9)(q22.1q34.3q34.1) is segregating provide data indicating that ABO lies in 9q22.1-q34.3, AK1 in 9q34.1-q34.3, and ORM in 9q34.3-qter.

Data are presented which show that the Diego blood groups are not part of the Dombrock or Yt blood group systems and that the locus controlling Di is not closely linked to the loci controlling ABO, Fy, Jk, Kell, MNSs, Rh, Gm, Inv, AcP,ADA, PGD, and UMPK.

In a series of 726 random Caucasian adults tested with anti-Coa and anti-Cob allele frequencies were Coa 0.9470, Cob 0.0530. The distribution of Colton phenotypes in 205 children of 57 selected families was in accordance with expectation. A linkage analysis of Co and 26 other loci indicates that Co is not closely linked to AcP1, ABO, AK1, Ch, Do, GLO, Gm, GPT, HLA, Hp, K, Lu, MN, PGM1 or Rh and does not lie between PGD and PGM1 on chromosome 1.

Statistical and serological evidence from a large kindred and two unrelated adults indicates that Targett (Tar) is an antigen in the Rh blood group system and that its presence is assocciated with a weak expression of the Rh antigen D. In the numerical notation the Tar antigen is designated Rh40.

Peak lods (zeta) of 3.48 at an estimated recombination fraction (theta) of 0.28 derived from 63 male and 90 female meioses indicate linkage between the KEL and YT blood group loci. Consideration is given to two families; a realistic interpretation of the data increases zeta to 4.24 at theta = 0.26.