Ecological relevance of high and low nucleic acid content bacteria in a monsoon influenced tropical estuary: Implications on the β-Glucosidase activity

Eswaran, Ranjith; Khandeparker, Lidita

doi:10.1016/j.actao.2020.103697

Cited by 7 publications

(6 citation statements)

References 62 publications

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“…As described elsewhere ( 50 – 52 ), these bacteria are probably capable of membrane repair, ensuring that they remain in the gut ecosystem, as seen here. The decrease in the abundance of HNA bacteria is consistent with results for other systems in which the HNA bacteria are more susceptible to damage ( 27 , 53 – 55 ), while the LNA bacteria have been found to be more resilient ( 55 , 56 ). These differences in susceptibility to damage may be a taxonomic characteristic for gut microbial communities, as the Firmicutes have previously been suggested to be more susceptible to perturbations than the Bacteroides ( 57 ).…”

Section: Discussionsupporting

confidence: 88%

Changes in Gut Bacterial Translation Occur before Symptom Onset and Dysbiosis in Dextran Sodium Sulfate-Induced Murine Colitis

et al. 2021

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Section: Discussionsupporting

confidence: 88%

Changes in Gut Bacterial Translation Occur before Symptom Onset and Dysbiosis in Dextran Sodium Sulfate-Induced Murine Colitis

et al. 2021

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“…To date, the majority of studies related to HNA and LNA bacteria have focused largely on their distribution, activities and compositions in the environment ( Joux et al, 2005 ; Longnecker et al, 2005 ; Vila-Costa et al, 2012 ; Liu et al, 2016 ). Previous studies have reported that the distribution of LNA and HNA bacteria is strongly regulated by environmental variables ( Nishimura et al, 2005 ; Liu et al, 2016 , 2017 ; Eswaran and Khandeparker, 2021 ) and changes seasonally ( Eswaran and Khandeparker, 2021 ). Researchers have tried to determine the phylogenetic composition of HNA and LNA bacteria, but have reached different conclusions.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal dynamics of high and low nucleic acid-content bacterial communities in Chinese coastal seawater: assembly process, co-occurrence relationship and the ecological functions

et al. 2023

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Studies of high nucleic acid-content (HNA) and low nucleic acid-content (LNA) bacterial communities are updating our view of their distributions and taxonomic composition. However, there are still large gaps in our knowledge of the composition, assembly processes, co-occurrence relationships and ecological functions of HNA and LNA bacterial communities. Here, using 16S rRNA gene amplicon sequencing, we investigated the spatiotemporal dynamics, assembly processes, co-occurrence relationships and ecological functions of HNA and LNA bacterial communities in the samples collected in summer and winter in Chinese coastal seas. The communities of HNA and LNA bacteria had clear spatiotemporal patterns and LNA bacteria was phylogenetically less diverse than HNA bacteria in both seasons. The distribution of HNA and LNA bacteria were significantly affected by the environmental factors and a significant seasonal-consistent distance-decay patterns were found in HNA and LNA bacteria. Furthermore, a quantitative assessment of ecological processes revealed that dispersal limitation, homogeneous selection exerted important roles in the community assembly of HNA and LNA bacteria. More importantly, we observed seasonality in the co-occurrence relationships: closer inter-taxa connections of HNA bacterial communities in winter than in summer and the opposite is true in the LNA bacterial communities. Some ecological functions, such as: phototrophy, photoautotrophy, oxygenic photoautotrophy, were different between HNA and LNA bacteria. These results provide a better understanding of spatiotemporal patterns, processes, and the ecological functions of HNA and LNA bacterial communities in Chinese coastal seawater.

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“…LNA bacteria are widely distributed in various environments, including oceans, lakes, rivers, springs, groundwater, wetlands, and sediments ( Servais et al, 2003 ; Longnecker et al, 2005 , 2006 ; Suzina et al, 2011 ; Liu et al, 2017 ; Proctor et al, 2018 ; Song et al, 2019a ; Eswaran and Khandeparker, 2021 ). The percentage of LNA bacteria in seawater and freshwater is summarized in Table 3 .…”

Section: The Distribution and Diversity Of Lna Bacteriamentioning

confidence: 99%

“…It was found that pH, total organic carbon (TOC), conductivity, and nitrogen-related concentrations played key roles in shaping LNA bacterial diversity ( Song et al, 2019a ). In addition, spatiotemporal changes also had significant effects on the cell granularity, DNA content, abundance, the distribution pattern and the community of LNA bacteria ( Schattenhofer et al, 2011 ; Vila-Costa et al, 2012 ; Eswaran and Khandeparker, 2021 ).…”

Section: The Distribution and Diversity Of Lna Bacteriamentioning

confidence: 99%

“…Low nucleic acid content (LNA) bacteria exist widely in the natural environments, including oceans, lakes, rivers, springs, groundwater, drinking water, greenland glacier ice core, wetlands and sediments, ranging from 20% to 90% of the total bacterial community in marine and freshwater environment ( Cottrell and Kirchman, 2000 ; Servais et al, 2003 ; Longnecker et al, 2005 , 2006 ; Miteva and Brenchley, 2005 ; Suzina et al, 2011 ; Liu et al, 2017 , 2018 ; Proctor et al, 2018 ; Eswaran and Khandeparker, 2021 ). Microbiologists have given different definitions and names to LNA bacteria based on their characteristics, such as filterable bacteria ( Wang et al, 2007 ), low-DNA bacteria ( Gasol et al, 1999 ).…”

Section: Introductionmentioning

confidence: 99%

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Characteristics, Biodiversity, and Cultivation Strategy of Low Nucleic Acid Content Bacteria

et al. 2022

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Low nucleic acid content (LNA) bacteria are ubiquitous and estimated to constitute 20%–90% of the total bacterial community in marine and freshwater environment. LNA bacteria with unique physiological characteristics, including small cell size and small genomes, can pass through 0.45-μm filtration. The researchers came up with different terminologies for low nucleic acid content bacteria based on different research backgrounds, such as: filterable bacteria, oligotrophic bacteria, and low-DNA bacteria. LNA bacteria have an extremely high level of genetic diversity and play an important role in material circulation in oligotrophic environment. However, the majority of LNA bacteria in the environment remain uncultivated. Thus, an important challenge now is to isolate more LNA bacteria from oligotrophic environments and gain insights into their unique metabolic mechanisms and ecological functions. Here, we reviewed LNA bacteria in aquatic environments, focusing on their characteristics, community structure and diversity, functions, and cultivation strategies. Exciting future prospects for LNA bacteria are also discussed.

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Ecological relevance of high and low nucleic acid content bacteria in a monsoon influenced tropical estuary: Implications on the β-Glucosidase activity

Cited by 7 publications

References 62 publications

Changes in Gut Bacterial Translation Occur before Symptom Onset and Dysbiosis in Dextran Sodium Sulfate-Induced Murine Colitis

Changes in Gut Bacterial Translation Occur before Symptom Onset and Dysbiosis in Dextran Sodium Sulfate-Induced Murine Colitis

Spatiotemporal dynamics of high and low nucleic acid-content bacterial communities in Chinese coastal seawater: assembly process, co-occurrence relationship and the ecological functions

Characteristics, Biodiversity, and Cultivation Strategy of Low Nucleic Acid Content Bacteria

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