Research decodingfirst deep-sea mussel genome

Research on decoding the first deep-sea mussel genome

8:51 AM, 24th May 2017
Research on decoding the first deep-sea mussel genome
(Front row from left) HKBU Huawei Mu; HKUST professor Pei-Yuan Qian; HKBU Dr Jian-Wen Qiu; HKUST Yi Lan; (back row from left) HKBU Yanjie Zhang and Ting Xu; and HKUST Dr Jin Sun.

HONG KONG, CHINA: A joint research led by Hong Kong Baptist University (HKBU) and the Hong Kong University of Science and Technology (HKUST) has assembled the 1.64 gigabytes genome of a deep-sea mussel, which is roughly equivalent to 50 percent of the size of human genome. This is the first decoded genome among all deep-sea macrobenthic animals, revealing a complete set of DNA. The discovery gives wider insights into future research on the mechanisms of symbiosis in other marine organisms such as giant tubeworms and giant clams.

The research team, led by HKUST's chair professor of division of life science professor Pei-Yuan Qian and HKBU's associate professor of biology Dr Jian-Wen Qiu, have published the research findings in the journal Nature Ecology & Evolution.

The team used a specimen collected in 2013 during Dr Qiu's participation in China's manned submersible Jiaolong expedition in the South China Sea for research. Deep-sea organisms including mussels thrive in extreme environments of hydrothermal vents and cold seeps which are characterised by high hydrostatic pressure, lack of photosynthesis-derived food, variable temperatures and high concentrations of toxic substances. Despite their ability to survive under stressful conditions, a lack of genomic resources has hindered the understanding of their molecular mechanisms of adaptation.

The study sequenced the genome of the deep-sea mussel Bathymodiolus platifrons as well as its shallow-water relative Modiolus philippinarum collected from a local softshore in Tingkok for comparison of genomic features.

Through phylogenetic analysis, the research team discovered that modern deep-sea mussels are the descendants of shallow-water mussels, and their ancestors migrated to the deep sea approximately 110 million years ago. Providing evidence to support a hypothesis that their ancestors survived through an extinction event during the global anoxia period associated with the Palaeocene-Eocene Thermal Maximum which occurred around 57 million years ago.

Genome comparison revealed that the great expansion of several gene families in the deep-sea mussel may be related to its adaptation to the deep sea. For instance, the expansion of the "heat shock protein 70 family", a family of proteins that are produced by a cell in response to exposure to stressful conditions, may help the mussel stabilise protein structures. The expansion of the "ABC transporters family", the unit of the transport system, may enhance the mussel's ability to move toxic chemicals outside its gill epithelial cells.

The expansion of gene families related to immune recognition, endocytosis and caspase-mediated apoptosis indicates the mussel's adaptation to the presence of chemoautotrophic endosymbionts in its gills. An additional proteomic analysis of the deep-sea mussel gill reveals nutritional and energetic dependency of the mussel on its methanotrophic symbionts.

"The study has provided genomic resources for understanding how the deep-sea mussel has adapted to the abiotic stresses and lack of photosynthesis-derived food in the deep-sea chemosynthetic environment. The general mechanisms of symbiosis revealed in the study are of relevance to other symbiotic organisms such as deep-sea tubeworms and giant clams," said Qian.

"The genomic resources will facilitate various studies, including genetic connectivity among deep-sea populations, which is relevant to the establishment of deep-sea marine reserves," added Qian.

The study was supported by the Strategic Priority Research Program of Chinese Academy of Sciences of China, HKUST, HKBU, Scientific and Technical Innovation Council of Shenzhen, and Guangdong Natural Science Foundation.

Other main collaborators are HKUST post-doc fellows Dr Jin Sun and Dr Weipeng Zhang, Dr Jerome Hui of The Chinese University of Hong Kong and his team members Wenyan Nong and Fiona Ka Man Cheung, Dr Runsheng Li of Hong Kong Baptist University, Dr Yu Zhang of Shenzhen University, Dr Zhang Yang of The South China Sea Institute of Oceanography, and Christopher Fields of University of Illinois at Urbana-Champaign.

© HKBU News



Your Comments (Up to 2000 characters)
Please respect our community and the integrity of its participants. WOC reserves the right to moderate and approve your comment.

Related News

ExxonMobil completes polyethylene lines at Mont Belvieu, Texas

HOUSTON, US: ExxonMobil Chemical Company has completed the mechanical work of two new high-performance polyethylene lines at its plastics plant in Mon ...

Read more
Dow CEO named co-chair of Saudi-US CEO forum

MIDLAND, US: The Dow Chemical Company’s chairman and chief executive officer (CEO) Andrew Liveris has been named co-chair of the newly laun ...

Read more
BASF’s functional textiles that cools the body

LUDWIGSHAFEN, GERMANY: BASF has developed an active functional cooling clothing that provides evaporative cooling which is individually dosable and la ...

Read more
Nova Chemicals rating outlook at negative: Fitch

CHICAGO, US: A report from the Fitch Ratings Inc states that it has given a rating of 'BBB-' to Nova Chemicals Corporation's (NOVA) announced $2.1 bil ...

Read more
Solenis acquires Nopco; strengthens water treatment portfolio

WILMINGTON, US: Solenis, formerly Ashland Water Technologies has signed an agreement to acquire the business and assets of Nopco Colombiana SA (Nopco ...

Read more
Covestro lifts force majeure on polymeric MDI in EMEA

LEVERKUSEN, GERMANY: Covestro AG is lifting the declared force majeure for polymeric methylene diphenyl diisocyanate (MDI) in the Europe, Mi ...

Read more uses cookies to ensure that we give you the best experience on our website. By using this site, you agree to our Privacy Policy and our Terms of Use. X