Article
Environmental Sciences
Leilen L. Gracia Villalobos, Leandro N. Getino Mamet, Nuria Vazquez, Gaspar Soria, Rodrigo J. Goncalves
Summary: The effects of the toxic dinoflagellate Alexandrium catenella on the Tehuelche scallop Aequipecten tehuelchus were investigated. The study found that exposure to A. catenella reduced larvae survival and impacted growth rates. Histopathological effects were also observed in spat exposed to the dinoflagellate.
MARINE ENVIRONMENTAL RESEARCH
(2023)
Article
Biotechnology & Applied Microbiology
Han-Sol Kim, Quynh Thi Nhu Bui, Hui Wang, Jang-Seu Ki
Summary: This study reports the characterization and transcriptional regulation of sxtB in the toxic dinoflagellate Alexandrium catenella, which produces STX. The gene is phylogenetically close to toxic cyanobacteria and its transcription levels are significantly up-regulated under low temperature conditions, showing a high correlation with increased STX contents.
JOURNAL OF APPLIED PHYCOLOGY
(2023)
Article
Environmental Sciences
Aude Boivin-Rioux, Michel Starr, Joel Chasse, Michael Scarratt, William Perrie, Zhenxia Long
Summary: The study reveals that Alexandrium catenella's bloom frequency and extent are expected to increase in the future, with changes in bloom seasonality. Under one climate scenario, the duration and spatial range of A. catenella blooms are predicted to expand each year, possibly posing threats to future marine ecosystems and industries.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Chemistry, Medicinal
Cheng-Zhe Ren, Hui-Min Gao, Jun Dai, Wen-Zhuo Zhu, Fei-Fei Xu, Yun Ye, Xiao-Ling Zhang, Qiao Yang
Summary: This study isolated a new bacterial strain LZ-28 from a harmful algal bloom-forming dinoflagellate and revealed its symbiotic relationship with the algal strain. The strain LZ-28 showed high production ability for bioflocculant exopolysaccharides (EPS), with glucose and fucose contributing to its bioflocculant capacity. Comparative genomic analysis also revealed the similarities among selected M. alba strains. This research highlights the potential applications of the active EPS produced by the Mameliella alba strain LZ-28.
Article
Microbiology
Xi Yang, Rong Xiang, Nurhezreen Md Iqbal, Yu-Han Duan, Xiao-Ai Zhang, Lei Wang, Lin-Zeng Yu, Jia-Zhou Li, Ming-Fei Sun, Qiao Yang, Chun-Tian Zheng, Shen-Quan Liao
Summary: A novel bacterium, designated as strain LZ-6(T), was isolated from harmful algal blooms dinoflagellates producing high levels paralytic shellfish poisoning toxins, and proposed as a novel subspecies of Marinobacter shengliensis, named as Marinobacter shengliensis subsp. alexandrii subsp. nov.
CURRENT MICROBIOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Yuka Onishi, Akihiro Tuji, Atsushi Yamaguchi, Ichiro Imai
Summary: The study identified seagrass beds as the source of algicidal and growth-inhibiting bacteria in coastal ecosystems, which suppressed the growth of A. catenella and reduced toxin contamination in bivalves in Akkeshi-ko Estuary.
APPLIED SCIENCES-BASEL
(2021)
Article
Biotechnology & Applied Microbiology
Qikun Xing, Young Woo Kim, Ji-Sook Park, Young-Seok Han, Charles Yarish, Hyun Il Yoo, Jang K. Kim
Summary: Herbicides that enter the ocean through surface runoff pose a significant pollution threat to coastal areas. Triazine herbicides, as photosynthetic inhibitors, are particularly harmful to marine photosynthetic organisms, such as phytoplankton. Herbicide pollution can also lead to other environmental issues, including algal blooms and toxin production. This study investigates the effects of a common triazine herbicide, terbutryn, on the physiological responses and gene expression of the harmful algal bloom species Alexandrium catenella. The results indicate that terbutryn inhibits photosynthesis and reduces the growth rate of A. catenella, highlighting the potential threat of herbicides to harmful algal blooms.
JOURNAL OF APPLIED PHYCOLOGY
(2023)
Article
Marine & Freshwater Biology
Pablo Saldivia, Mauricio Hernandez, Adolfo Isla, Rocio Fritz, Daniel Varela, Jesus M. Gonzalez-Jartin, Jaime Figueroa, Luis M. Botana, Cristian Vargas, Alejandro J. Yanez
Summary: Dinoflagellates of the genus Alexandrium cause Harmful Algal Blooms (HABs), which damage marine environments, aquaculture, and human health. They synthesize neurotoxic alkaloids known as PSTs, the etiological agents of Paralytic Shellfish Poisoning (PSP). Increased nitrogen concentrations enhance protein synthesis, photosynthesis, and energy metabolism but decrease the expression of enzymes involved in PST biosynthesis and production in toxigenic dinoflagellates.
Article
Marine & Freshwater Biology
Goh Nishitani, Keigo Yamamoto, Masaki Nakajima, Yoshiki Shibata, Waka Sato-Okoshi, Mineo Yamaguchi
Summary: A novel strain of Amoebophrya sp. ex Alexandrium catenella was cultured from Osaka Bay, Japan, and found to infect not only Alexandrium but also Prorocentrum in culture, with confirmed infection in Tripos in a field sample. The parasite had a significant effect on the dynamics of A. catenella, particularly on the termination of the blooms, with a maximum prevalence of 73% during the Alexandrium bloom period in Osaka Bay.
Article
Environmental Sciences
Hyeon Ho Shin, Moon Ho Son, Bum Soo Park, Kyung Ha Han, Joo Yeon Youn, Kyeong Yoon Kwak, Ji Hoon Lee, A. -Young Shin, Eunjung Byun, Yeong Du Yoo, Min Ho Seo, Kyungsoon Shin, Zhun Li
Summary: This study investigated the germination features of ellipsoidal Alexandrium cysts isolated from sediments collected in Jinhae-Masan Bay, Korea. The results showed that the cysts could germinate across a wide range of temperature and their germination was not controlled by seasonal salinity changes. These findings provide important insights into the bloom dynamics of Alexandrium catenella in Jinhae-Masan Bay.
MARINE POLLUTION BULLETIN
(2023)
Article
Biotechnology & Applied Microbiology
Hui Wang, Hansol Kim, Jang-Seu Ki
Summary: The study characterized the transcriptome of marine dinoflagellate Alexandrium pacificum under various stresses, revealing numerous stress-responsive genes with potential diverse origins. Specifically, genes related to antioxidant enzymes, heat shock proteins, carotenoid biosynthesis, and other stress-responsive genes were identified. The findings suggest that A. pacificum possesses a range of stress-resistant genes that may aid in adaptation to new environments.
JOURNAL OF APPLIED PHYCOLOGY
(2021)
Article
Endocrinology & Metabolism
Hicham Benabdelkamel, Mohamed Rafiullah, Afshan Masood, Abdulaziz Alsaif, Mohthash Musambil, Assim A. Alfadda
Summary: This study used proteomics approach to analyze the alterations in the thyroid tissue proteome in patients with benign diffuse goiter. The results showed significant changes in the expression of tissue proteins, particularly in signaling pathways and metabolic pathways.
FRONTIERS IN ENDOCRINOLOGY
(2022)
Article
Marine & Freshwater Biology
Ren-Cheng Yu, Qing-Chun Zhang, Yang Liu, Zhen-Fan Chen, Hui-Xia Geng, Li Dai, Zhuo-Ru Lin, Wen-Jiao Tang, Fan-Zhou Kong, Tian Yan, Ming-Jiang Zhou
Summary: An outbreak of paralytic shellfish poisoning in Qinhuangdao, China in April 2016 was suspected to be caused by the toxic species in genus Alexandrium. High throughput sequencing data suggested that A. catenella, A. pacificum, and A. ostenfeldii could potentially produce PSTs. Three isolates of Alexandrium established from a 2019 cruise were identified as A. catenella and had toxin profiles similar to previous phytoplankton samples collected in Qinhuangdao.
Article
Reproductive Biology
Giusy Rusco, Mariola Slowinska, Michele Di Iorio, Silvia Cerolini, Angela B. Maffione, Andrzej Ciereszko, Nicolaia Iaffaldano
Summary: This study compared the whole proteome of fresh and cryopreserved rabbit semen and found that cryopreservation led to changes in protein composition. These changes were associated with energy metabolism, protein quality control, reproductive processes, and cell death/survival regulation, resulting in a significant decrease in the motility, viability, and fertilizing ability of post-thawing rabbit sperm.
Article
Environmental Sciences
Camilo Rodriguez-Villegas, Rosa Figueroa, Ivan Perez-Santos, Carlos Molinet, Gonzalo S. Saldias, Sergio A. Rosales, Gonzalo Alvarez, Pamela Linford, Patricio A. Diaz
Summary: Harmful Algal Blooms (HAB) are a significant global issue, with the dinoflagellate species Alexandrium catenella being responsible for the toxin named Paralytic Shellfish Poisoning (PSP). Understanding the origins and formation of these blooms is essential for prediction. Previous research in Chilean Patagonia has focused on coastal areas, neglecting the adjacent oceanic regions. Through a combination of field studies and modeling approaches, it was found that the submarine canyons in the continental shelf off northern Chilean Patagonia enhance coastal upwelling, increasing the risk of resuspension of A. catenella resting cysts.
MARINE POLLUTION BULLETIN
(2022)