Perda programada de milhões de pares de bases de um genoma de vertebrado

Programmed loss of millions of base pairs from a vertebrate genome

Jeramiah J. Smitha,b, Francesca Antonaccia, Evan E. Eichlera and Chris T. Amemiyab,c,1

+Author Affiliations

Departments of aGenome Sciences and

cBiology, University of Washington, Seattle, WA 98195; and

bBenaroya Research Institute at Virginia Mason, Seattle, WA 98101

Edited by Alec Jeffreys, University of Leicester, Leicester, United Kingdom, and approved May 19, 2009 (received for review March 4, 2009)

Abstract

In general, the strict preservation of broad-scale structure is thought to be critical for maintaining the precisely tuned functionality of vertebrate genomes, although nearly all vertebrate species undergo a small number of programmed local rearrangements during development (e.g., remodeling of adaptive immune receptor loci). However, a limited number of metazoan species undergo much more extensive reorganizations as a normal feature of their development. Here, we show that the sea lamprey (Petromyzon marinus), a jawless vertebrate, undergoes a dramatic remodeling of its genome, resulting in the elimination of hundreds of millions of base pairs (and at least one transcribed locus) from many somatic cell lineages during embryonic development. These studies reveal the highly dynamic nature of the lamprey genome and provide the first example of broad-scale programmed rearrangement of a definitively vertebrate genome. Understanding the mechanisms by which this vertebrate species regulates such extensive remodeling of its genome will provide invaluable insight into factors that can promote stability and change in vertebrate genomes.

development lamprey rearrangement chrodate Petromyzon

Footnotes

1To whom correspondence should be addressed. E-mail: camemiya@benaroyaresearch.org

Author contributions: J.J.S. designed research; J.J.S. and F.A. performed research; J.J.S., F.A., E.E.E., and C.T.A. contributed new reagents/analytic tools; J.J.S. analyzed data; and J.J.S. and C.T.A. wrote the paper.

The authors declare no conflict of interest.

This article is a PNAS Direct Submission.

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