Molecular Biology and Evolution, Vol 10, 1150-1169, Copyright © 1993 by Society for Molecular Biology and Evolution
WR Atchley and W Fitch
Phylogenetic analyses of genetic data arising from 144 gene loci are used
to describe the interrelationships among 24 widely used inbred strains of
mice. An unordered-parsimony analysis gives a cladogram that is virtually
identical to the known genealogy of the mouse strains. A loss-parsimony
analysis is used to evaluate the hypothesis that the observed patterns of
genetic divergence among these 24 strains can be explained by the
segregation of residual heterozygosity arising from a small population of
highly heterozygous mice. The loss-parsimony cladogram is very similar to
both the unordered-parsimony cladogram and the known genealogy of the mice.
The phylogenetic analyses of these 144 loci are integrated with data on the
type and origin of the Y chromosome. Inclusion of the Y-chromosome data
provides additional insights into the genetic composition of several of the
original stocks used to produce the current inbred strains of mice. Ten
strains of uncertain origin are contained in these analyses, including AKR,
BUB, CE, I, NZB, P, RF, SJL, ST, and SWR. SJL is hypothesized to have been
derived from the same Swiss albino stock previously used to produce SWR.
The BUB strain appears to have had a complex origin and shows closest
genetic similarity to SWR and ST. AKR and RF are shown to be closely
related, while the I strain shows greatest genetic similarity to DBA/2 for
the 144 loci. However, I and DBA possess different types of Y chromosome.
The NZB strain shows genetic similarity to several stocks of both U.S. and
European origins. The power of the genetic data used in these analyses
reiterates that inbred strains of mice can be a valuable paradigm for
studies in evolutionary biology.
ORIGINAL ARTICLE
Genetic affinities of inbred mouse strains of uncertain origin
Department of Genetics, North Carolina State University, Raleigh 26795- 7614.
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