Brajogopal Samanta

@gitam.edu

Assistant Professor, Deaperment of Microbiology
GITAM (Deemed to be University)

Brajogopal Samanta


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https://researchid.co/brajomicro
15

Scopus Publications

222

Scholar Citations

8

Scholar h-index

7

Scholar i10-index

Scopus Publications

  • New records of red algae (Rhodophyta) from the intertidal rocky shore of Visakhapatnam coast of Bay of Bengal, India
    A. Sakshi Rao, Swathi Pattigundla, Rama Ravi Teja Kosuri, Brajogopal Samanta
    Aquatic Botany, 2025
  • Auxospore structure and development in Toxarium sp.
    Irena Kaczmarska, James M. Ehrman, Brajogopal Samanta
    Nova Hedwigia, 2025
  • Analysis of antimicrobial potential and functional perspectives of marine macroalgal epiphytic microbiomes from Visakhapatnam coast of Bay of Bengal, India
    Swathi Pattigundla, A. Sakshi Rao, Rama Ravi Teja Kosuri, Brajogopal Samanta
    European Journal of Phycology, 2025
    The macroalgae (basibiont) and associated epiphytic microbiome (epibiont) evolved as a functional unit known as ‘macroalgal holobiont’. In this non-parasitic association, the epiphytic microbial biofilm acts as a protective layer on macroalgae. A suspected but relatively unknown capability of the macroalgal epiphytic microbiome is that it secretes a vast array of secondary metabolites that ultimately help in host defence. The present study evaluated the antimicrobial potential of marine macroalgal epiphytic microbiomes using culture-dependent and -independent approaches. In the culture-dependent approach, 271 bacterial strains were isolated from 61 different macroalgal host samples representing 16 genera of macroalgae, and their antibacterial activity was screened using a microbiological assay. Thirty-one bacterial isolates showed antibacterial activity against common bacterial pathogens; most (~75%) were identified as Bacillus species. In the culture-independent approach, we sequenced the metagenome of seven selected macroalgal epiphytic microbiomes. A total of 236 putative biosynthetic gene clusters (BGCs) were predicted from seven metagenomic libraries, which represent 12 different classes of BGCs. Non-ribosomal peptide synthetase (NRPS) was the most abundant (20%), followed by terpene (18%). Other notable clusters were ribosomally synthesized and post-translationally modified peptides (RiPP-like; 13%), homoserine lactone (Hserlactone; 13%), Ectoine (9%), type 1 polyketide synthase (T1PKS; 8%), and RiPP Recognition Element (RRE)-containing (8%) types. Overall, the integrative screening effort suggests that the macroalgal epiphytic microbiome could be the potential reservoir for future novel antimicrobial compound discovery. In addition, detecting several acyl homoserine-lactone (AHL) encoding BGCs in the metagenome dataset indicates their essential role in macroalgal epiphytic microbial colonization via quorum sensing (QS). Similar types of BGCs encoded by taxonomically distinct microbial species were observed from different hosts, suggesting that they could be functionally equivalent within the microbiomes.
  • Metagenome Analysis of Speleothem Microbiome from Subterranean Cave Reveals Insight into Community Structure, Metabolic Potential, and BGCs Diversity
    Brajogopal Samanta, Shivasmi Sharma, Roli Budhwar
    Current Microbiology, 2023
  • Vegetative cell enlargement in selected centric diatom species–an alternative way to propagate an individual genotype
    Irena Kaczmarska, James M. Ehrman, Kelsey E. Mills, Steven G. Sutcliffe, Brajogopal Samanta
    European Journal of Phycology, 2023
    Vegetative cell enlargement (VCE) and structures involved are documented for the first time using epifluorescence and electron microscopy. We examined three centric diatom species with polar and non-polar valve outlines. VCE progressed in two ways. The first involved liberation of the protoplast, nearly isodiametric expansion, and building of the large frustule in a more or less spherical cell. Protoplast retraction as observed in sexual auxospores before the formation of initial valves was never observed. Cell walls produced a variety of scales, including valve-like scales before the first enlarged epivalve was deposited. VCE wall structures were not similar to auxospore walls of the same species. The morphology of the first enlarged valve, the epivalve, differed from that of typical vegetative valves to a varying degree, depending on the species. The second way to vegetatively enlarge cells involved expansion of the girdle region of the existing small frustule. The circumference of the girdle region grew due to the deposition of irregular, supernumerary copulae. These copulae produced one or more protuberances, resulting in a misshapen cell. This misshapen cell then divided mitotically, and the first enlarged valve was a hypovalve. Hypovalve morphology strongly differed from that of typical vegetative valves. Several subsequent mitotic divisions were required to restore normal, species-specific frustules. Over time, irrespective of the manner of enlargement, the enlarged cells grew well and eventually became more frequent than small cells in our cultures. The scale factors of enlarged cells compared with pre-enlargement size in our experiments (1.1–5.2) were similar to those reported for other species (1.4–7.5). Additionally, we found that size increases from VCE were comparable to those resulting from sexual reproduction of the same species. Therefore, VCE can potentially expand the resident time of the population in the environment to the same degree as would production of sexual initial cells.
  • Structural evolution of SLA promoter in mosquito-borne flaviviruses: A sequence-structure based phylogenetic framework
    Brajogopal Samanta
    Virology, 2021
  • Auxosporulation in Biddulphia tridens (Ehrenberg) Ehrenberg (Mediophyceae, Bacillariophyta)
    Brajogopal Samanta, Irena Kaczmarska, James M. Ehrman
    European Journal of Phycology, 2020
    We documented male and female gametogenesis, auxospore structure and development of the biddulphioid diatom species Biddulphia tridens (Ehrenberg) Ehrenberg, a close relative of the generitype. Our mating experiments showed that the B. tridens clones were homothallic, self-fertile and produced two eggs per oogonium. During spermatogenesis, spermatogonia developed by depauperating mitosis from spermatogonangium cells and four hologenous uniflagellate male gametes were produced per spermatocyte. In the early stage of auxospore development, cells were globular to sub-globular in shape and covered with a siliceous envelope. The incunabular scales on these auxospores showed a great diversity in size and shape. In the later stages of development, auxospores grew anisodiametrically, facilitated by transverse perizonial bands. Initial epivalve formation was preceded by the retraction of the protoplast from the auxospore wall. The structural features of sex cells such as incunabular scales found in B. tridens are distinct from other broadly defined biddulphioid diatoms thus far examined. This is consistent with the distant relationship between true Biddulphia species and the Biddulphia-like diatoms indicated by molecular phylogenies. Morphological and molecular examination of B. tridens clones were performed here only to confirm species identity. This complete reproductive dataset from a true Biddulphia species will provide valuable insights for future studies of the relationships between Biddulphia-like diatoms and true Biddulphia species.
  • Auxosporulation in Chaetoceros acadianus sp. nov. (Bacillariophyceae), a new member of the Section Compressa
    Irena Kaczmarska, Brajogopal Samanta, James M. Ehrman, Ellen M. A. Porcher
    European Journal of Phycology, 2019
    We document the fine structure of auxospores in a Chaetoceros species isolated from the Acadian coast of New Brunswick, Canada. Auxospore development in this species occurs in a terminal rather than lateral position, a characteristic never before observed in this genus. Our observations suggest that auxosporulation was uniparental, probably an extreme form of autogamy with sister nuclei fusing following meiosis II. Mature auxospores were adze-shaped to sub-globular and contained both scales and transverse perizonia in their walls. The transverse perizonial band structure was similar to longitudinal perizonial bands found in other species of Chaetoceros and differed from the pinnate bands of pennate transverse perizonia, which consisted of a central rib and bilateral fimbria. Instead, the band structure in C. acadianus was more similar to unilateral fimbriate bands in cymatosiroids. We also propose that our diatom represents a species new to science and is a member of the Chaetoceros Section Compressa. We provide its morphological, molecular and reproductive characterization.
  • A consensus secondary structure of ITS2 for the diatom Order Cymatosirales (Mediophyceae, Bacillariophyta) and reappraisal of the order based on DNA, morphology, and reproduction
    Brajogopal Samanta, James M. Ehrman, Irena Kaczmarska
    Molecular Phylogenetics and Evolution, 2018
  • Study of diatom assemblages in Sundarbans mangrove water based on light microscopy and rbcL gene sequencing
    Brajogopal Samanta, Punyasloke Bhadury
    Heliyon, 2018
    Hasle and Fryxell, was reported for the first time in an Asian mangrove ecosystem based on light microscopy. Our study suggests the importance of establishing cultures and their polyphasic taxonomy are the future necessity to create an authenticated diatom database from mangrove water, which is still overlooked globally.
  • Spermatogenesis in the bipolar centric diatom Plagiogrammopsis vanheurckii (Mediophyceae)
    Brajogopal Samanta, Quentin Heffell, James M. Ehrman, Irena Kaczmarska
    Phycologia, 2018
  • Gametogenesis and Auxospore Development in the Bipolar Centric Diatom Brockmanniella brockmannii (Family Cymatosiraceae)
    Brajogopal Samanta, Michael E. Kinney, Quentin Heffell, James M. Ehrman, Irena Kaczmarska
    Protist, 2017
  • A comprehensive framework for functional diversity patterns of marine chromophytic phytoplankton using rbcL phylogeny
    Brajogopal Samanta, Punyasloke Bhadury
    Scientific Reports, 2016
  • Thalassiosira sundarbana sp. nov. (Bacillariophyta), an estuarine diatom from Sundarbans mangrove ecoregion based on morphology and molecular phylogeny
    Brajogopal Samanta, Punyasloke Bhadury
    Phycological Research, 2015
  • Analysis of diversity of chromophytic phytoplankton in a mangrove ecosystem using rbcL gene sequencing
    Brajogopal Samanta, Punyasloke Bhadury
    Journal of Phycology, 2014

RECENT SCHOLAR PUBLICATIONS

  • Analysis of antimicrobial potential and functional perspectives of marine macroalgal epiphytic microbiomes from Visakhapatnam coast of Bay of Bengal, India
    S Pattigundla, AS Rao, RRT Kosuri, B Samanta
    European Journal of Phycology 60 (4), 438-454 , 2025
    2025
    Citations: 1
  • New records of red algae (Rhodophyta) from the intertidal rocky shore of Visakhapatnam coast of Bay of Bengal, India
    AS Rao, S Pattigundla, RRT Kosuri, B Samanta
    Aquatic Botany 199, 103883 , 2025
    2025
    Citations: 1
  • Auxospore structure and development in Toxarium sp.
    I Kaczmarska, JM Ehrman, B Samanta
    Nova Hedwigia, 577-590 , 2025
    2025
  • Efficacy of Limosilactobacillus reuteri UBLRu-87 in infantile colic and its symptoms: a double-blind, placebo-controlled study
    R Venkataraman, MK Basvanyappa, B Samanta, M Yadla, NA Ravi, ...
    Cureus 17 (4) , 2025
    2025
    Citations: 1
  • Oligocene archaeomonad stomatocysts from the Polish Central Paratethys.
    I Kaczmarska, JM Ehrman, B Samanta
    Acta Palaeontologica Polonica 70 (2) , 2025
    2025
  • Macroalgal Epiphytic Microbiome: A Potential Source of Novel Drugs
    B Samanta, P Swathi
    Marine Ecosystems: A Unique Source of Valuable Bioactive Compounds, 184-205 , 2023
    2023
    Citations: 2
  • Metagenome analysis of speleothem microbiome from subterranean cave reveals insight into community structure, metabolic potential, and BGCs diversity
    B Samanta, S Sharma, R Budhwar
    Current Microbiology 80 (10), 317 , 2023
    2023
    Citations: 9
  • Vegetative cell enlargement in selected centric diatom species–an alternative way to propagate an individual genotype
    I Kaczmarska, JM Ehrman, KE Mills, SG Sutcliffe, B Samanta
    European Journal of Phycology 58 (3), 315-332 , 2023
    2023
    Citations: 15
  • Structural evolution of SLA promoter in mosquito-borne flaviviruses: A sequence-structure based phylogenetic framework
    B Samanta
    Virology 562, 110-120 , 2021
    2021
    Citations: 6
  • Auxosporulation in Biddulphia tridens (Ehrenberg) Ehrenberg (Mediophyceae, Bacillariophyta)
    B Samanta, I Kaczmarska, JM Ehrman
    European Journal of Phycology 55 (3), 296-309 , 2020
    2020
    Citations: 7
  • Auxosporulation in Chaetoceros acadianus sp. nov. (Bacillariophyceae), a new member of the Section Compressa
    I Kaczmarska, B Samanta, JM Ehrman, EMA Porcher
    European Journal of Phycology 54 (2), 206-221 , 2019
    2019
    Citations: 7
  • A consensus secondary structure of ITS2 for the diatom Order Cymatosirales (Mediophyceae, Bacillariophyta) and reappraisal of the order based on DNA, morphology, and reproduction
    B Samanta, JM Ehrman, I Kaczmarska
    Molecular Phylogenetics and Evolution 129, 117-129 , 2018
    2018
    Citations: 14
  • Study of diatom assemblages in Sundarbans mangrove water based on light microscopy and rbcL gene sequencing
    B Samanta, P Bhadury
    Heliyon 4 (6) , 2018
    2018
    Citations: 14
  • Spermatogenesis in the bipolar centric diatom Plagiogrammopsis vanheurckii (Mediophyceae)
    B Samanta, Q Heffell, JM Ehrman, I Kaczmarska
    Phycologia 57 (3), 354-359 , 2018
    2018
    Citations: 5
  • Gametogenesis and auxospore development in the bipolar centric diatom Brockmanniella brockmannii (family Cymatosiraceae)
    B Samanta, ME Kinney, Q Heffell, JM Ehrman, I Kaczmarska
    Protist 168 (5), 527-545 , 2017
    2017
    Citations: 12
  • A comprehensive framework for functional diversity patterns of marine chromophytic phytoplankton using rbcL phylogeny
    B Samanta, P Bhadury
    Scientific Reports 6 (20783), DOI: 10.1038/srep20783 , 2016
    2016
    Citations: 16
  • Molecular diversity and ecology of chromophytic phytoplankton from Sundarbans mangrove ecosystem
    B Samanta
    Indian Institute of Science Education and Research Kolkata , 2016
    2016
  • Thalassiosira sundarbana sp. nov. (Bacillariophyta), an estuarine diatom from Sundarbans mangrove ecoregion based on morphology and molecular phylogeny
    B Samanta, P Bhadury
    Phycological Research 63 (2), 102-109 , 2015
    2015
    Citations: 6
  • Analysis of diversity of chromophytic phytoplankton in a mangrove ecosystem using rbc L gene sequencing
    B Samanta, P Bhadury
    Journal of phycology 50 (2), 328-340 , 2014
    2014
    Citations: 45
  • Unraveling chromophytic phytoplankton assemblages from Indian Sundarbans mangrove wetlands based on rbcL clone library and sequencing approach
    B Samanta, P Bhadury
    Life for River- Proceedings of the international symposium on River … , 2014
    2014

MOST CITED SCHOLAR PUBLICATIONS

  • Temporal succession of phytoplankton assemblages in a tidal creek system of the Sundarbans mangroves: an integrated approach
    D Bhattacharjee, B Samanta, AA Danda, P Bhadury
    International Journal of Biodiversity 2013 (1), 824543 , 2013
    2013
    Citations: 53
  • Analysis of diversity of chromophytic phytoplankton in a mangrove ecosystem using rbc L gene sequencing
    B Samanta, P Bhadury
    Journal of phycology 50 (2), 328-340 , 2014
    2014
    Citations: 45
  • A comprehensive framework for functional diversity patterns of marine chromophytic phytoplankton using rbcL phylogeny
    B Samanta, P Bhadury
    Scientific Reports 6 (20783), DOI: 10.1038/srep20783 , 2016
    2016
    Citations: 16
  • Vegetative cell enlargement in selected centric diatom species–an alternative way to propagate an individual genotype
    I Kaczmarska, JM Ehrman, KE Mills, SG Sutcliffe, B Samanta
    European Journal of Phycology 58 (3), 315-332 , 2023
    2023
    Citations: 15
  • A consensus secondary structure of ITS2 for the diatom Order Cymatosirales (Mediophyceae, Bacillariophyta) and reappraisal of the order based on DNA, morphology, and reproduction
    B Samanta, JM Ehrman, I Kaczmarska
    Molecular Phylogenetics and Evolution 129, 117-129 , 2018
    2018
    Citations: 14
  • Study of diatom assemblages in Sundarbans mangrove water based on light microscopy and rbcL gene sequencing
    B Samanta, P Bhadury
    Heliyon 4 (6) , 2018
    2018
    Citations: 14
  • Gametogenesis and auxospore development in the bipolar centric diatom Brockmanniella brockmannii (family Cymatosiraceae)
    B Samanta, ME Kinney, Q Heffell, JM Ehrman, I Kaczmarska
    Protist 168 (5), 527-545 , 2017
    2017
    Citations: 12
  • Metagenome analysis of speleothem microbiome from subterranean cave reveals insight into community structure, metabolic potential, and BGCs diversity
    B Samanta, S Sharma, R Budhwar
    Current Microbiology 80 (10), 317 , 2023
    2023
    Citations: 9
  • Impact of Climate Change in the Sundarban Aquatic Ecosystems: Phytoplankton as Proxies
    D Bhattacharjee, B Samanta, A Danda, P Bhadury
    Climate Change and Island and coastal vulnerability, 126-140 , 2013
    2013
    Citations: 8
  • Auxosporulation in Biddulphia tridens (Ehrenberg) Ehrenberg (Mediophyceae, Bacillariophyta)
    B Samanta, I Kaczmarska, JM Ehrman
    European Journal of Phycology 55 (3), 296-309 , 2020
    2020
    Citations: 7
  • Auxosporulation in Chaetoceros acadianus sp. nov. (Bacillariophyceae), a new member of the Section Compressa
    I Kaczmarska, B Samanta, JM Ehrman, EMA Porcher
    European Journal of Phycology 54 (2), 206-221 , 2019
    2019
    Citations: 7
  • Structural evolution of SLA promoter in mosquito-borne flaviviruses: A sequence-structure based phylogenetic framework
    B Samanta
    Virology 562, 110-120 , 2021
    2021
    Citations: 6
  • Thalassiosira sundarbana sp. nov. (Bacillariophyta), an estuarine diatom from Sundarbans mangrove ecoregion based on morphology and molecular phylogeny
    B Samanta, P Bhadury
    Phycological Research 63 (2), 102-109 , 2015
    2015
    Citations: 6
  • Spermatogenesis in the bipolar centric diatom Plagiogrammopsis vanheurckii (Mediophyceae)
    B Samanta, Q Heffell, JM Ehrman, I Kaczmarska
    Phycologia 57 (3), 354-359 , 2018
    2018
    Citations: 5
  • Macroalgal Epiphytic Microbiome: A Potential Source of Novel Drugs
    B Samanta, P Swathi
    Marine Ecosystems: A Unique Source of Valuable Bioactive Compounds, 184-205 , 2023
    2023
    Citations: 2
  • Analysis of antimicrobial potential and functional perspectives of marine macroalgal epiphytic microbiomes from Visakhapatnam coast of Bay of Bengal, India
    S Pattigundla, AS Rao, RRT Kosuri, B Samanta
    European Journal of Phycology 60 (4), 438-454 , 2025
    2025
    Citations: 1
  • New records of red algae (Rhodophyta) from the intertidal rocky shore of Visakhapatnam coast of Bay of Bengal, India
    AS Rao, S Pattigundla, RRT Kosuri, B Samanta
    Aquatic Botany 199, 103883 , 2025
    2025
    Citations: 1
  • Efficacy of Limosilactobacillus reuteri UBLRu-87 in infantile colic and its symptoms: a double-blind, placebo-controlled study
    R Venkataraman, MK Basvanyappa, B Samanta, M Yadla, NA Ravi, ...
    Cureus 17 (4) , 2025
    2025
    Citations: 1
  • Auxospore structure and development in Toxarium sp.
    I Kaczmarska, JM Ehrman, B Samanta
    Nova Hedwigia, 577-590 , 2025
    2025
  • Oligocene archaeomonad stomatocysts from the Polish Central Paratethys.
    I Kaczmarska, JM Ehrman, B Samanta
    Acta Palaeontologica Polonica 70 (2) , 2025
    2025