Evolution of the nuclear ribosomal DNA intergenic spacer in four species of the Daphnia pulex complex.

ABSTRACT:

Background

Concerted evolution refers to the pattern in which copies of multigene families show high intraspecific sequence homogeneity but high interspecific sequence diversity. Sequence homogeneity of these copies depends on relative rates of mutation and recombination, including gene conversion and unequal crossing over, between misaligned copies. The internally repetitive intergenic spacer (IGS) is located between the genes for the 28S and 18S ribosomal RNAs. To identify patterns of recombination and/or homogenization within IGS repeat arrays, and to identify regions of the IGS that are under functional constraint, we analyzed 13 complete IGS sequences from 10 individuals representing four species in the Daphnia pulex complex.

Results

Gene conversion and unequal crossing

SUBMITTER: Ambrose CD 

PROVIDER: S-EPMC3036644 | biostudies-literature | 2011 Jan

REPOSITORIES: biostudies-literature