Publication Date:
2013-12-18
Description:
An understanding of ctenophore biology is critical for reconstructing events that occurred early in animal evolution. Toward this goal, we have sequenced, assembled, and annotated the genome of the ctenophore Mnemiopsis leidyi. Our phylogenomic analyses of both amino acid positions and gene content suggest that ctenophores rather than sponges are the sister lineage to all other animals. Mnemiopsis lacks many of the genes found in bilaterian mesodermal cell types, suggesting that these cell types evolved independently. The set of neural genes in Mnemiopsis is similar to that of sponges, indicating that sponges may have lost a nervous system. These results present a newly supported view of early animal evolution that accounts for major losses and/or gains of sophisticated cell types, including nerve and muscle cells.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3920664/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉 〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3920664/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ryan, Joseph F -- Pang, Kevin -- Schnitzler, Christine E -- Nguyen, Anh-Dao -- Moreland, R Travis -- Simmons, David K -- Koch, Bernard J -- Francis, Warren R -- Havlak, Paul -- NISC Comparative Sequencing Program -- Smith, Stephen A -- Putnam, Nicholas H -- Haddock, Steven H D -- Dunn, Casey W -- Wolfsberg, Tyra G -- Mullikin, James C -- Martindale, Mark Q -- Baxevanis, Andreas D -- ZIA HG000140-13/Intramural NIH HHS/ -- ZIA HG000140-14/Intramural NIH HHS/ -- ZIA HG000140-15/Intramural NIH HHS/ -- New York, N.Y. -- Science. 2013 Dec 13;342(6164):1242592. doi: 10.1126/science.1242592.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Genome Technology Branch, Division of Intramural Research, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24337300" target="_blank"〉PubMed〈/a〉
Keywords:
Animals
;
Base Sequence
;
*Biological Evolution
;
Cell Lineage/*genetics
;
Ctenophora/classification/*cytology/*genetics
;
*Genome
;
Mesoderm/cytology
;
Molecular Sequence Data
;
Muscle Development/genetics
;
Neurogenesis/genetics
;
Phylogeny
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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