Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Accelerated gene evolution and subfunctionalization in the pseudotetraploid frog Xenopus laevis

Journal Article · · BMC Biology
 [1];  [2];  [2];  [2];  [2];  [2]
  1. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States); OSTI
  2. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States); Univ. of California, Berkeley, CA (United States). Center for Integrative Genomics. Dept. of Molecular and Cell Biology

Ancient whole genome duplications have been implicated in the vertebrate and teleost radiations, and in the emergence of diverse angiosperm lineages, but the evolutionary response to such a perturbation is still poorly understood. The African clawed frog Xenopus laevis experienced a relatively recent tetraploidization ~40 million years ago. Analysis of the considerable amount of EST sequence available for this species together with the genome sequence of the related diploid Xenopus tropicalis provides a unique opportunity to study the genomic response to whole genome duplication. Results. We identified 2218 gene triplets in which a single gene in X. tropicalis corresponds to precisely two co-orthologous genes in X. laevis – the largest such collection published from any duplication event in animals. Analysis of these triplets reveals accelerated evolution or relaxation of constraint in the peptides of the X. laevis pairs compared with the orthologous sequences in X. tropicalis and other vertebrates. In contrast, single-copy X. laevis genes do not show this acceleration. Duplicated genes can differ substantially in expression levels and patterns. We find no significant difference in gene content in the duplicated set, versus the single-copy set based on molecular and biological function ontologies. Conclusion. These results support a scenario in which duplicate genes are retained through a process of subfunctionalization and/or relaxation of constraint on both copies of an ancestral gene.

Research Organization:
USDOE Joint Genome Institute (JGI), Berkeley, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1904069
Journal Information:
BMC Biology, Journal Name: BMC Biology Journal Issue: 1 Vol. 5; ISSN 1741-7007
Publisher:
BioMed CentralCopyright Statement
Country of Publication:
United States
Language:
English

References (36)

More genes in fish? journal June 1998
Xenopus, the next generation:X. Tropicalis genetics and genomics journal November 2002
Techniques and probes for the study ofXenopus tropicalis development journal November 2002
Evolution by Gene Duplication book January 1970
Evolution of the differential regulation of duplicate genes after polyploidization journal December 1979
Basic local alignment search tool journal October 1990
Genetics of Xenopus laevis book January 1991
Appendix G: In Situ Hybridization: An Improved Whole-Mount Method for Xenopus Embryos book January 1991
Comparative genome analysis of monocots and dicots, toward characterization of angiosperm diversity journal April 2004
Subfunction partitioning, the teleost radiation and the annotation of the human genome journal October 2004
A mitochondrial DNA phylogeny of African clawed frogs: phylogeography and implications for polyploid evolution journal October 2004
Ancient origin of the Hox gene cluster journal January 2001
Analysis of the genome sequence of the flowering plant Arabidopsis thaliana journal December 2000
Yesterday's polyploids and the mystery of diploidization journal May 2001
Genome duplication in the teleost fish Tetraodon nigroviridis reveals the early vertebrate proto-karyotype journal October 2004
The genome of the social amoeba Dictyostelium discoideum journal May 2005
Extensive genomic duplication during early chordate evolution journal May 2002
Age distribution of human gene families shows significant roles of both large- and small-scale duplications in vertebrate evolution journal May 2002
On Some Principles Governing Molecular Evolution journal July 1974
Preservation of Duplicate Genes by Complementary, Degenerative Mutations journal April 1999
The sense of smell: genomics of vertebrate odorant receptors journal May 2002
Fugu Genome Analysis Provides Evidence for a Whole-Genome Duplication Early During the Evolution of Ray-Finned Fishes journal June 2004
CLUSTAL W: improving the sensitivity of progressive multiple sequence alignment through sequence weighting, position-specific gap penalties and weight matrix choice journal January 1994
The TIGR Gene Indices: clustering and assembling EST and known genes and integration with eukaryotic genomes journal December 2004
Applications for protein sequence-function evolution data: mRNA/protein expression analysis and coding SNP scoring tools journal July 2006
Sequencing and analysis of 10,967 full-length cDNA clones from Xenopus laevis and Xenopus tropicalis reveals post-tetraploidization transcriptome remodeling journal June 2006
PANTHER: A Library of Protein Families and Subfamilies Indexed by Function journal September 2003
Functional Divergence of Duplicated Genes Formed by Polyploidy during Arabidopsis Evolution journal June 2004
Zebrafish hox Clusters and Vertebrate Genome Evolution journal November 1998
The Evolutionary Fate and Consequences of Duplicate Genes journal November 2000
Albumin phylogeny for clawed frogs (Xenopus) journal February 1977
Orthologs, Paralogs, and Evolutionary Genomics journal December 2005
Duplicated genes evolve slower than singletons despite the initial rate increase journal January 2004
Multiple Mechanisms Promote the Retained Expression of Gene Duplicates in the Tetraploid Frog Xenopus laevis journal April 2006
Systematic screening for genes specifically expressed in the anterior neuroectoderm during early Xenopus development journal January 2005
Mechanisms of Haploinsufficiency Revealed by Genome-Wide Profiling in Yeast journal February 2005

Similar Records

Accelerated Gene Evolution and Subfunctionalization in thePseudotetraploid Frog Xenopus Laevis
Journal Article · Wed Feb 28 23:00:00 EST 2007 · BMC Biology · OSTI ID:919498

Sequencing and analysis of 10967 full-length cDNA clones from Xenopus laevis and Xenopus tropicalis
Journal Article · Sun Oct 30 23:00:00 EST 2005 · Genome Research , vol. 16, no. 6, June 1, 2006, pp. 796-803 · OSTI ID:889991

The Genome of the Western Clawed Frog Xenopus tropicalis
Journal Article · Thu Oct 01 00:00:00 EDT 2009 · Science · OSTI ID:1010537