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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

High-resolution linkage map of mouse chromosome 13 in the vicinity of the host resistance locus Lgn1.

Natural resistance of inbred mouse strains to infection with Legionella pneumophila is controlled by the expression of a single dominant gene on chromosome 13, designated Lgn1. The genetic difference at Lgn1 is phenotypically expressed as the presence or absence of intracellular replication of L. pneumophila in host macrophages. In our effort to identify the Lgn1 gene by positional cloning, we have generated a high-resolution linkage map of the Lgn1 chromosomal region. For this, we have carried out extensive segregation analysis in a total of 1270 (A/J x C57BL/6J) x A/J informative backcross mice segregating the resistance allele of C57BL/6J and the susceptibility allele of A/J. Additional segregation analyses were carried out in three preexisting panels of C57BL/6J x Mus spretus interspecific backcross mice. A total of 39 DNA markers were mapped within an interval of approximately 30 cM overlapping the Lgn1 region. Combined pedigree analyses for the 5.4-cM segment overlapping Lgn1 indicated the locus order and the interlocus distances (in cM): D13Mit128-(1.4)-D13Mit194-(0.1)-D13Mit147-(0.9)-D13 Mit36-(0.9)-D13Mit146-(0.2)-Lgn1/D13Mit37-(1.0)- D13Mit70. Additional genetic linkage studies of markers not informative in the A/J x C57BL/6J cross positioned D13Mit30, -72, -195, and -203, D13Gor4, D13Hun35, and Mtap5 in the immediate vicinity of the Lgn1 locus. The marker density and resolution of this genetic linkage map should allow the construction of a physical map of the region and the isolation of YAC clones overlapping the gene.[1]


  1. High-resolution linkage map of mouse chromosome 13 in the vicinity of the host resistance locus Lgn1. Beckers, M.C., Ernst, E., Diez, E., Morissette, C., Gervais, F., Hunter, K., Housman, D., Yoshida, S., Skamene, E., Gros, P. Genomics (1997) [Pubmed]
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