Estimation of ancestral gene set of bilaterian animals and its implication to dynamic change of gene content in bilaterian evolution

Atsushi Ogura, Kazuho Ikeo, Takashi Gojobori*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


To understand the process of bilaterian evolution, we estimated ancestral gene sets at the split of plant-animal-fungi and the divergence of bilaterian animals and from 1,236,790 non-redundant genes. We, then, examined how the numbers of the gene clusters have changed since the split. As a result, we estimated the numbers of gene clusters in the ancestral gene sets of plant-animal-fungi and bilaterian animals to be at least 2469 and 6577, respectively. Thus, we found a 2.7-fold increase in the number of gene clusters during the period from the evolutionary split of plant-animal-fungi to the divergence of bilaterian animals. Moreover, when we compared these numbers of ancestral gene clusters with those of extant animals such as the nematode, fly, mouse and human, we found that the extant bilaterian animals have retained more than 3500 gene clusters of the ancestral gene set, and have lost more than 1600 gene clusters. It suggests that these processes of genomic diversification provided bilaterian animals with molecular basis for species diversity.

Original languageEnglish (US)
Pages (from-to)65-71
Number of pages7
Issue number1 SPEC. ISS.
StatePublished - Jan 17 2005


  • Deuterostomes
  • Diversification
  • Gene gain
  • Gene loss
  • Genome
  • Protostomes

ASJC Scopus subject areas

  • Genetics

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