Research Highlights: New bacteria discovered in Southern California may be affiliating with cyanobacteria


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New bacteria discovered in Southern California may be affiliating with cyanobacteria

  • Sediminibacterium is a member of Chitinophagaceae first described in 2008.
  • Sediminibacterium is a gram-negative bacterium and is closely related to Niabella and Terrimonas.
  • Sediminibacterium is motile and can be either obligate aerobes or facultative anaerobes.
  • A group of Southern California researchers led by Prof. Arun Sethuraman of San Diego State University and California State University San Marcos discovered the novel Sediminibacterium.
  • The discovery came after sequencing laboratory cultures of cyanobacteria from freshwater streams in Southern California.
  • The genome of Sediminibacterium that resides in the blue-green algal phycosphere was sequenced.
  • Phycosphere is a mucus region containing organic matter which surrounds a cyanobacterium.[1]
  • Microalgae secrete a sugary substance into the phycosphere which can be used by bacterial colonizers.
  • Analysis revealed an almost complete genome that was placed within sediminibacterial clades.
  • Results also revealed that the new bacteria may have genes involved in a mutualistic/commensal relationship with cyanobacteria.
  • The study helps understand the relationship between sediminibacteria and cyanobacteria, and the discovered genome may be utilized for future research.

Sources:

Sethuraman, A., Stancheva, R., Sanders, C., Caceres, L., Castro, D., Hausknecht-Buss, H., Henry, S., Johansen, H., Kasler, A., Lastor, S., Massaro, I., Mekuria, I., Moron-Solano, A., Read, N., Vengerova, G., Zhang, A., Zhang, X., & Read, B. (2022). Genome of a novel Sediminibacterium discovered in association with two species of freshwater cyanobacteria from streams in Southern California. G3 (Bethesda, Md.), jkac123. Advance online publication. https://doi.org/10.1093/g3journal/jkac123

[1] https://en.wikipedia.org/wiki/Phytoplankton

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