Patterns of DNA Variation Among Three Centromere Satellite Families in <Emphasis Type="Italic">Arabidopsis halleri</Emphasis> and <Emphasis Type="Italic">A</Emphasis>. <Emphasis Type="Italic">lyrata</Emphasis> |
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Authors: | Akira Kawabe Deborah Charlesworth |
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Institution: | (1) Institute of Evolutionary Biology, University of Edinburgh, Ashworth Laboratories King’s Buildings, West Mains Road, Edinburgh, EH9 3JT, UK |
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Abstract: | We describe patterns of DNA variation among the three centromeric satellite families in Arabidopsis halleri and lyrata. The newly studied subspecies (A. halleri ssp. halleri and A. lyrata ssp. lyrata and petraea), like the previously studied A. halleri ssp. gemmifera and A. lyrata ssp. kawasakiana, have three different centromeric satellite families, the older pAa family (also present in A. arenosa) and two families, pAge1 and pAge2, that probably evolved more recently. Sequence variability is high in all three satellite
families, and the pAa sequences do not cluster by their species of origin. Diversity in the pAge2 family is complex, and different
from variation among copies of the other two families, showing clear evidence for exchange events among family members, especially
in A. halleri ssp. halleri. In A. lyrata ssp. lyrata there is some evidence for recent rapid spread of pAge2 variants, suggesting selection favoring these sequences.
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Reviewing Editor: Dr. Brian Morton] |
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Keywords: | Centromere Satellite Repetitive sequence Arabidopsis halleri Arabidopsis lyrata Gene conversion |
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