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

Recombination and mutation of class II histocompatibility genes in wild mice.

We have compared the tryptic peptide fingerprints of the A alpha, A beta, E alpha, and E beta subunits encoded by four wild-derived H-2 complexes expressing A molecules closely related to Ak. The A molecules encoded by these Ak-related mice have A alpha and A beta subunits that differ from A alpha k and A beta k by less than 10% of their tryptic peptides. Comparisons among the four wild-derived A molecules suggested that these contemporary A alpha and A beta alleles arose by sequential mutational events from common ancestor A alpha and A beta alleles. These results suggest that A alpha and A beta may co-evolve as an A beta A alpha gene duplex in wild mice. Tryptic peptide fingerprint comparisons of the E beta gene linked to these Ak-related A beta A alpha gene duplexes indicate that two encode E beta d-like subunits, whereas another encodes an E beta s-like subunit. These results strongly suggest that the A beta A alpha duplex and E beta recombine in wild mouse populations. The significantly different evolutionary patterns exhibited by the class II genes encoding A vs E molecules are discussed.[1]


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