Biomedical subjects
Publications and source records attributed to J Dausset.
Five sera from multiparous women were absorbed and eluted from the Daudi cell line devoid of HLA antigens. These eluates recognized a specificity, Ly-Lil, of the Ly-Li system. Further absorption of one eluate in Bjab or Raji cell line subdivided this specificity. Family studies showed that the five eluates from the Daudi cell line segregate into two distinct groups.
Using a set of 17 primed LD typing (PLT) cells tested on a panel of 35 unrelated cells, we showed that certain groups of PLT cells tended to detect similar unrelated cells. The PLT cells were grouped into seven clusters and these tended to correlate with the seven HLA-D specificities represented on the panel, as determined by HTC testing. These data suggest that the antigens that cause restimulation in PLT are similar to those HLA-D antigens detected by the homozygous typing cell (HTC) test or, alternatively but more unlikely, that the two typing methods are detecting genes in close linkage disequilibrium with the HLA-D region.
A clear correlation was observed between the presence of an Ia-like antigenic B-cell system Ly-Li, detected serologically, and three cellular immunological techniques: [1] mixed lymphocyte reaction (MLR) inhibition by an anti-Li antiserum; [2] level of restimulation of anti-Ly-Li in-vitro-primed lymphocytes; and [3] detection of HLA-D alleles by homozygous typing cells. These results suggested that the allelic products detected serologically may be identical to those detected by the first two techniques, namely MLR inhibition and in-vitro-primed lymphocyte typing, and, possibly, HLA-D typing using homozygous typing cells, although the correlation was repeatedly found to be less clear for the last technique.
By testing a group of PLT cells over a panel of unrelated restimulating cells, the PLT's could be grouped into clusters according to their ability to discriminate antigen(s) in unrelated cells. The PLT clusters broadly correlated with the homozygous typing cell-defined HLA-D clusters represented on the panel. The PLTs grouped together clearly segregate with a particular HLA haplotype when tested in both unrelated families not possessing the sensitizing haplotype and in the family with the sensitizing haplotype. No influence of HLA SD antigens could be observed in PLT restimulation in the segregation studies.
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In 68 idiopathic aplastic anemia patients (65 HLA genotypes), HLA-A2 is slightly increased (p corrected less than 0.03) leading to a relative risk of 2.30. A slight excess of homozygotes for HLA-A was observed (22.2 vs. 14.09%), involving mostly the A2 antigen. In the siblings the patients were more frequently homozygote A2 than by chance (p less than 0.005). The same trends are observed in Fanconi's anemia = out of 18 patients, 7 are HLA-A homozygote (of whom 4 are A2). The hypothesis of the existence of one or several recessive genes involved in hematopoiesis situated close to HLA-A is advanced.
In the department of Professor Dausset 41 cases of periodic disease referred by 7 clinics in Paris were examined. Two studies were carried out. A series of 31 not related patients was testes with 30 locus A and B antigen and the frequencies observed were compared with the frequencies in a French and Yemenite Jew population. No statistically valid increase of an HLA gene indicative of a relationship between periodic disease and HLA was found. In 5 cases of amyloidosis HLA A 28 was present and it is possible that this gene is related to the amyloid complication. A family study on 12 families, 7 of which included at least 2 affected children, confirmed the recessive hereditary character of the disease, but not in relation to the HLA system. A parallel clinical study was made, which corroborated the previous studies as regards the frequency of clinical signs. The therapeutic study proved the value of long-term colchicin treatment with or without antihistaminics. The frequency of pain and abdominal crises was reduced, but there was little effect on the articular manifestations.
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Twelve families comprising 62 individuals, 31 allergic to grasses, were examined. No significant correlation between pollinosis and the HLA system was observed. However, there was a close correlation between cocksfoot skin tests and the RAST (p less than 10(-6)).
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A clear correlation has been observed between the presence of the antigenic B cell system Ly-Li detected serologically, and 3 cellular immunology techniques: 1. MLR inhibition by anti-Li serum; 2. level of restimulation of anti-Ly-Li in vitro primed lymphocytes; 3. detection of HLA-D alleles by homozygous typing cells. These results suggest that the allelic products detected serologically may be identical to those detected by the first two techniques, namely MLR inhibition and in vitro primed lymphocyte typing, and possibly HLA-D typing using homozygous typing cells, although the correlation was found to be repeatedly less clear for the last technique.