Biomedical subjects
K Fischer-Lindahl
Publications and source records attributed to K Fischer-Lindahl.
Encyclopedia of the mouse genome V. Mouse chromosome 17.
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Encyclopedia of the mouse genome III. October 1993. Mouse chromosome 17.
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The Mls locus: new clues to a lingering mystery.
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Molecular characterization of a meiotic recombinational hotspot enhancing homologous equal crossing-over.
We have cloned and sequenced a meiotic recombinational hotspot between the A beta 3 and A beta 2 genes in the major histocompatibility complex (MHC) of the mouse. This recombinational hotspot in the Mus musculus castaneus cas3 haplotype was previously localized to a region of 9.5 kb of DNA in which five independent crossing-over events occurred at the unusually high frequency of 0.6%. Aside from cas3, the hotspot appears to be absent in many other MHC haplotypes. We have now confined the five recombinational breakpoints to a stretch of 3.5 kb of DNA. From the nucleotide sequence around the recombinational breakpoints, determined in the parental cas3 and b haplotypes as well as for two recombinant haplotypes, we show that the two recombinant haplotypes were generated by homologous equal crossing-over and place the breakpoints within two non-overlapping stretches of 10 and 36 bp, respectively. Comparison of the DNA sequences of the hotspot-positive cas3 and the hotspot-negative b haplotypes reveals a number of differences, in particular, a CAGA-repeat sequence which is present in CAS3 in six, but only four copies in C57BL/6 DNA. This repeat sequence is reminiscent of one in a previously characterized hotspot in the E beta gene.
Functional heterogeneity of H-2Dk-region products.
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Genetics of a non-H-2 antigen that stimulates "unrestricted" helper T cells and MLR.
The inheritance of antigens expressed by C3H/Tif B cells that stimulate MHC-unrestricted helper T cells from C3H/HeJ was investigated. F1 hybrids between C3H/HeJ and C3H/Tif and 39 C3H/HeJ X F1 backcross mice were characterized as to the ability of their spleen cells to stimulate a proliferative C3H/HeJ T helper cell response and to respond to helper cell activity by the development of polyclonal plaque-forming cell responses. Backcross progeny wee also typed for the following markers segregating in this cross: 1) Responsiveness to the B cell mitogen lipopolysaccharide (LPS); 2) LyM-1 allotype; 3) antigen(s) stimulating a primary non-H-2 MLR between these strains, previously ascribed to Mls locus differences, 4) expression of target antigens for cytotoxic T cells raised in the same strain combination. The antigen(s) recognized by helper cells and those stimulating primary MLR are controlled by autosomal gene(s) and segregate as a single trait. These antigens, however, are not encoded in genes linked to either the Lps or the Mls loci, and are not recognized by cytotoxic T cells raised in the same strain combination.