Journal: Proceedings of the Royal Society B
Affiliations: 5Go to article
How sea squirts got their safety sac
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Sea squirts — filter-feeders stuck to the rocky ocean floor — evolved their tough tubular ‘tunic’ after obtaining a bacterial gene.
Genes can jump between unrelated organisms, but cannot act on the new host unless they adapt to its unique gene expression systems. A team including researchers from the University of Tsukuba has discovered how cellulose synthase, the gene responsible for growing the protective pouch on sea squirts, was successfully acquired from actinobacteria, a common bacterial group found in soils and oceans.
The group found that AP-2, a protein coding gene, specifically controls the expression of cellulose synthase in the protective outer layer of sea squirts. AP-2 also preferentially recognizes guanine and cytosine (GC) rich DNA. Since the actinobacteria genome is 70 per cent GC, AP-2 could rapidly detect and express the GC-rich cellulose synthase in a beneficial way.
Horizontal gene transfer, such as this, may occasionally succeed due to a natural compatibility between two organisms, bringing evolutionary advantages that would otherwise depend upon rare mutations, the authors say.
- Proc. Royal Soc. B 283, 20161712 (2016). doi: 10.1098/rspb.2016.1712
|Shimoda Marine Research Center (SMRC), University of Tsukuba, Japan||0.36||0.36|
|Institute of Medical Science (IMSUT), UTokyo, Japan||0.27||0.27|
|Faculty / Graduate School of Science, HU, Japan||0.18||0.18|
|Department of Biological Sciences, TMU, Japan||0.09||0.09|
|Faculty of Science and Technology, Kochi University, Japan||0.09||0.09|