期刊
GENES
卷 10, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/genes10040294
关键词
tunicates; CesA genes; ORTHOSCOPE; horizontal gene transfer
资金
- Japan Society for the Promotion of Science (JSPS) [18K06396, 18K06142, 16H04824]
- Grants-in-Aid for Scientific Research [18K06396, 16H04824, 18K06142] Funding Source: KAKEN
Tunicates or urochordatescomprising ascidians, larvaceans, and salpsare the only metazoans that can synthesize cellulose, a biological function usually associated with bacteria and plants but not animals. Tunicate cellulose or tunicine is a major component of the outer acellular coverage (tunic) of the entire body of these organisms. Previous studies have suggested that the prokaryotic cellulose synthase gene (CesA) was horizontally transferred into the genome of a tunicate ancestor. However, no convenient tools have been devised to determine whether only tunicates harbor CesA. ORTHOSCOPE is a recently developed tool used to identify orthologous genes and to examine the phylogenic relationship of molecules within major metazoan taxa. The present analysis with this tool revealed the presence of CesA orthologs in all sequenced tunicate genomes but an absence in other metazoan genomes. This supports an evolutionary origin of animal cellulose and provides insights into the evolution of this animal taxon.
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