Reconstructing large regions of an ancestral mammalian genome in silico.

Abstract:

:It is believed that most modern mammalian lineages arose from a series of rapid speciation events near the Cretaceous-Tertiary boundary. It is shown that such a phylogeny makes the common ancestral genome sequence an ideal target for reconstruction. Simulations suggest that with methods currently available, we can expect to get 98% of the bases correct in reconstructing megabase-scale euchromatic regions of an eutherian ancestral genome from the genomes of approximately 20 optimally chosen modern mammals. Using actual genomic sequences from 19 extant mammals, we reconstruct 1.1 Mb of ancient genome sequence around the CFTR locus. Detailed examination suggests the reconstruction is accurate and that it allows us to identify features in modern species, such as remnants of ancient transposon insertions, that were not identified by direct analysis. Tracing the predicted evolutionary history of the bases in the reconstructed region, estimates are made of the amount of DNA turnover due to insertion, deletion, and substitution in the different placental mammalian lineages since the common eutherian ancestor, showing considerable variation between lineages. In coming years, such reconstructions may help in identifying and understanding the genetic features common to eutherian mammals and may shed light on the evolution of human or primate-specific traits.

journal_name

Genome Res

journal_title

Genome research

authors

Blanchette M,Green ED,Miller W,Haussler D

doi

10.1101/gr.2800104

subject

Has Abstract

pub_date

2004-12-01 00:00:00

pages

2412-23

issue

12

eissn

1088-9051

issn

1549-5469

pii

14/12/2412

journal_volume

14

pub_type

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