Unable to connect to database - 06:22:54 Unable to connect to database - 06:22:54 SQL Statement is null or not a SELECT - 06:22:54 SQL Statement is null or not a DELETE - 06:22:54 Botany & Plant Biology 2007 - Abstract Search
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Abstract Detail


Evolutionary Development

Hasebe, Mitsuyasu [1].

Evolution of developmental genes in land plants.

One of the major findings in evolutionary developmental biology is the conservation of genetic networks of developmental genes in extant metazoans, which diverged 630 million years ago. After the establishment of general developmental networks in the common ancestor of bilateral metazoans, the networks changed with gene duplications and subsequently gene losses, which caused present diversity of metazoans. Land plants are the other major multicellular organisms, which landed around 480 million years ago. The evolution of developmental genes in land plants is still a challenging issue, because genome information was only available in angiosperms, which originated around 200 million years ago. Recently, whole genomes of the green algae Chlamydomonas reinhardtii, the moss Physcomitrella patens, and the lycopod Selaginella moellendorffii were mostly sequenced and genome-wide comparisons of developmental genes became possible. We used 700 Arabidopsis thaliana developmental genes as queries and searched homologous genes in other organisms. Phylogenetic trees of the homologs were constructed using the neighbor-joining and maximum likelihood methods, and the existence of potential orthologous genes was examined. Conservation and divergence of developmental genes in land plants will be discussed.


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1 - National Institute for Basic Biology, Laboratory of Evolutionary Biology, 38 Nishigonaka, Myodaiji-cho, Okazaki, AICHI, 444-8585, Japan

Keywords:
genome
development
gene duplication
gene loss
Chlamydomonas
Selaginella moellendorffii
Physcomitrella patens.

Presentation Type: ASPB Major Symposium
Session: S04
Location: International Ballroom/Hilton
Date: Monday, July 9th, 2007
Time: 2:40 PM
Number: S04002
Abstract ID:1212


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