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김소정
김소정 (So-Jeong Kim) 저자 이메일 보기
한국지질자원연구원
 
조회 542  인쇄하기 주소복사 트위터 공유 페이스북 공유 
Genomic and metatranscriptomic analyses of carbon remineralization in an Antarctic polynya
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Abstract

Background
Polynyas in the Southern Ocean are regions of intense primary production, mainly by Phaeocystis antarctica. Carbon fixed by phytoplankton in the water column is transferred to higher trophic levels, and finally, to the deep ocean. However, in the Amundsen Sea, most of this organic carbon does not reach the sediment but is degraded in the water column due to high bacterial heterotrophic activity.

Results
We reconstructed 12 key bacterial genomes from different phases of bloom and analyzed the expression of genes involved in organic carbon remineralization. A high correlation of gene expression between the peak and decline phases was observed in an individual genome bin-based pairwise comparison of gene expression. Polaribacter belonging to Bacteroidetes was found to be dominant in the peak phase, and its transcriptional activity was high (48.9% of the total mRNA reads). Two dominant Polaribacter bins had the potential to utilize major polymers in P. antarctica, chrysolaminarin and xylan, with a distinct set of glycosyl hydrolases. In the decline phase, Gammaproteobacteria (Ant4D3, SUP05, and SAR92), with the potential to utilize low molecular weight-dissolved organic matter (LMW-DOM) including compatible solutes, was increased. The versatility of Gammaproteobacteria may contribute to their abundance in organic carbon-rich polynya waters, while the SAR11 clade was found to be predominant in the sea ice-covered oligotrophic ocean. SAR92 clade showed transcriptional activity for utilization of both polysaccharides and LMW-DOM; this may account for their abundance both in the peak and decline phases. Ant4D3 clade was dominant in all phases of the polynya bloom, implicating the crucial roles of this clade in LMW-DOM remineralization in the Antarctic polynyas.

Conclusions
Genomic reconstruction and in situ gene expression analyses revealed the unique metabolic potential of dominant bacteria of the Antarctic polynya at a finer taxonomic level. The information can be used to predict temporal community succession linked to the availability of substrates derived from the P. antarctica bloom. Global warming has resulted in compositional changes in phytoplankton from P. antarctica to diatoms, and thus, repeated parallel studies in various polynyas are required to predict global warming-related changes in carbon remineralization.

Keywords: Carbon remineralization, Genomics, Metatranscriptomics, Polynya

논문정보
- 형식: Research article
- 게재일: 2019년 02월 (BRIC 등록일 2019-03-08)
- 연구진: 국내(교신)+국외 연구진태극기
- 분야: Microbiology
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관련인물
김종걸 (충북대학교)
이성근 (충북대학교)
관련분야 논문보기
Microbiology

외부링크
Google (by So-Jeong Kim)
Pubmed (by So-Jeong Kim)
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19th Avison Biomedical Symposium 2019
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사전접수: ~2019.05.27
날짜: 2019.05.31~06.01
장소: 서대문구 연세로 50-1 신촌세브란스병원 은명대강당
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의료기기 GMP의 이해과정(재직자 과정)
날짜: 2019.06.18~20
장소: 경기도 성남시 분당구 판교로289번길 20 스타트업캠퍼스 2층 세미나실2
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제6회 KXA(대한 이종이식 연구회) 심포지엄
날짜: 2019.05.30
장소: 서울대학교 의과대학 삼성암연구동 2층 이건희홀
비임상시험 계획서 및 보고서 Review 과정(재직자 과정)
비임상시험 계획서 및 보고서 Review 과정(재직자 과정)
날짜: 2019.05.29~31
장소: 경기도 성남시 분당구 판교로289번길 20 스타트업캠퍼스 2층 세미나실1
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