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Assistant Professor
bhabatosh [at] thsti [dot] res [dot] in
2012 - Present: Assistant Professor
2008 - 2011: Post-Doctoral Research Fellow, Department of Chromosome Segregation and Cell Division, CGM-CNRS, Gif, France
2003 - 2008: Ph.D. (Science), Indian Institute of Chemical Biology, Jadavpur University, India
2001 - 2003: M.Tech. (Biotech. and Biochem. Eng.), IIT-Kharagpur, India

 Research of Interest

(i) Explore the striking alliance between microorganisms and the human host and attempt to understand the role and effect of microorganisms in human health and diseases. Currently, we are investigating the role and impact of human gut microbiota in Severe Acute Malnutrition (SAM) and Inflammatory Bowl Diseases (IBD), which are directly linked to microbial richness, dynamics, and functional repository of the microbial genome.

(ii) Understand the acquisition and dissemination mechanisms of antimicrobial resistance traits in human gut microbiota and re-sensitize extensively drug resistant enteric pathogens.



  • Das B.@,Ghosh TS., Kedia S., Rampal R., Saxena S., Bag S., Ridhima M., Dayal M., Mehta O., Surendranath A., Travis SPL., Tripathi P., Nair GB., Ahuja V. (2018). Analysis of the gut microbiome of Rural and Urban  Healthy Indians living in Sea level and High Altitude Areas.  Sci.  Rep. 2018 Jul 4;8(1):10104.
  • Bag S., Ghosh T.S., Banerjee S., Mehta O, Verma J., Dayal M., Anbumani D., Kumar P., Saha B., Kedia S., Ahuja V., Ramamurthy T., Das B@. (2018). Molecular Insights into Antimicrobial Resistance Traits of Commensal Human Gut Microbiota. Mic. Ecol. Doi:10.1007/s00248-018-1228-7
  • Das B@., Verma J., Kumar P., Ghosh A., Ramamurthy T. (2018). Antibiotic Resistance in Vibrio cholerae: Understanding the Genesis and Mechanisms. Vaccine (Provisionally Accepted).
  • Sarkar S., Das B.@, Banerjee S.K.@. Insights into the Human Gut   Microbiome and Cardiovascular Diseases. J. Prac. Card. Sci. 2018;4:10-4.
  • Kumar A., Bag S., Das B@. Novel Genetic tool to study the stability of genomic islands. Rec. Pat. Biotech. 2018 Feb 22. doi:10.2174/1872208312666180223113618.
  • Pant A., Das B., Bhadra RK. (2018). CTX phage of Vibrio cholerae: Genomics and applications. Vaccine (Provisionally Accepted).



  • Das B@., Choudhuri S., Srivastava R., Nair G.B., Ramamurthy T. Fostering research into antimicrobial resistance in India. BMJ 2017;358:j3535 PMID:28877874
  • Bag S., Ghosh T.S., Das B@. Complete genome sequence of Faecalibacterium prausnitzii strain Indica isolated from the gut of a healthy adult Indian. Genome Announc. 16;5(46). pii: e01286-17. PMID:29146862
  • Bag S., Ghosh T.S., Das B@. Complete genome sequence of Collinsella aerofaciens strain Indica isolated from the gut of a healthy Indian. Genome Announc. 22;5(47). pii: e01361-17. doi: 10.1128/genomeA.01361-17. PMID: 29167267
  • Kumar P., Bag S., Dey P., Ghosh T.S., Dayal M., Saha B., Verma J., Saxena S., Pant A., Kumar D., Desigamani A., Rana P., Hanpude P., Maity T.K., Bhadra R.K., Sharma N.C., Nair G.B., Ramamurthy T., Das B. Molecular Insights into Antimicrobial Resistance Traits of Multidrug Resistant Enteric Pathogens isolated from India Sci.  Rep.  2017 Oct 31;7(1):14468. PMID: 29089611
  • Bag S., Ghosh T.S., Das B@. Whole Genome Sequence of Megasphaera elsdenii strain Indica isolated from the gut of a healthy adult Indian. Genome Announc 5: e01033-17. PMID:29051237
  • Das A., Pereira V., Saxena S., Ghosh TS., Anbumani D., Bag S., Das B., Nair GB., Abraham P., Mande SS (2017) Gastric microbiome of Indian patients with Helicobacter pylori infection, and their interaction network. 2017, Sci.  Rep. 7, 15438. PMID:29133866
  • Bag S., Ghosh T.S., Das B@. Whole Genome Sequence of Bifidobacterium longum strain Indica isolated from the gut of a healthy adult Indian. Genome Announc. 5: e01017-17. PMID:29025929
  • Bag S., Ghosh T., Das B.@ Draft Genome Sequence of Prevotella copri isolated from the gut of a healthy adult Indian. Genome Announc. 5:e00834-17. PMID:28912310



  • Das B., Pazhani G.P., Sarkar A., Mukhopadhyay A.K., Nair G.B., Ramamurthy T. Molecular Evolution and Functional Divergence of Vibrio cholerae. Curr. Opin. Infect. Dis. 2016, 29(5):520-7. PMID:27537830
  • Bag S.*, Saha B.*, Mehta O.*, D. Anbumani, Kumar N., Dayal M., Pant A., Kumar P., Saxena S., AllinK.H., Hansen T., Arumugam M., Vestergaard H.,Pedersen O., Pereira V., Abraham P., Tripathi R., Wadhwa N., Bhatnagar S., PrakashV.G., Radha V., Anjana R. M., Mohan V., Takeda K., Kurakawa T., Nair G.B., Das B.@ An Improved Method For Isolation Of High Quality Community Bacterial DNA From Human And Environmental Samples For Metagenomics Studies. Sci. Rep. 2016, 6, 26775
  •  Rakonjac J., Das B., and Derda R. Filamentous Bacteriophage in Bio/Nano/Technology, Bacterial Pathogenesis and Ecology. Front. Microbiol. 2016, 7:2109 PMID:28066406.
  • Chowdhury G., Bhadra R.K., Bag S., Pazhani G.P., Das B., Basu P., Nagamani K., Nandy R.K., Mukhopadhyay A.K., Ramamurthy T.  Rugose atypical Vibrio cholerae O1 El Tor responsible for 2009 cholera outbreak in India. J. Med. Microb. 2016, 65: 1130-1136 PMID:27561681


  • Pant A., Anbumani D., Bag S., Mehta B., Kumar P., Saxena S., Nair G. B., Das B.@ Effect of LexA on chromosomal integration of CTXfin Vibrio cholerae. J. Bacteriol.2015, 198:268-75. PMID: 26503849


  • Das B.@ Mechanistic Insights Into Filamentous Phage Integration In Vibrio cholerae. Front. Microbiol. 2014, 5:650. PMID:25506341
  • Das B.@, Kumari R., Pant A., Sen Gupta S., Saxena S., Nair G.B. A Novel, Broad-Range, CTXΦ-Derived Stable Integrative Expression Vector For Functional Studies. J. Bacteriol. 2014, 196(23): 4071-80. PMID:25225263
  • Das B*, Banerjee R*, Nair G.B., Basak S. Dynamics in genome evolution of Vibrio cholerae. Infect Genet Evol. 2014, 23:32-41. PMID:24462909 (*equally contributed)
  • Das B.*,Midonet C.*,  Paly E., Barre F.X. XerD initiates the integration of TLCΦinto the Vibrio cholerae genome independently of FtsK. Proc. Natl. Acad. Sci. USA; 2014, 111 (47): 16848-16853.PMID:25385643  (*equally contributed)
  •  Das B., Nair G.B., Bhadra R.K. Acquisition and dissemination mechanisms of CTXΦ in Vibrio cholerae: New paradigm for dif residents. World J Med Genet. 2014, 4: 27-33.
  • Bag S., Das B., Dasgupta S., Bhadra R.K. Mutational analysis of the (p)ppGpp synthetase activity of the Rel enzyme of Mycobacterium tuberculosis. Arch Microbiol. 2014,196(8):575-88. PMID:24859914
  • Kim E.J., Lee D., Moon S.H., Lee C.H., Kim S.J., Lee J.H., Kim, J.O., Song M., Das B., Clemens J.D., Pape J. W., Nair G.B., Kim D.W. Molecular insights into the evolutionary pathway of Vibrio choleraeO1 atypical El Tor variants. Plos pathogens. 2014, 0(9):e1004384. PMID:25233006
  • Ghosh T.S., Sen Gupta S., Bhattacharya T., Yadav D., Barik A., Chowdhury A., Das B., Mande S.S., Nair G.B. Gut Microbiomes of Indian children of varying nutritional status. PLoS One.2014,9:e95547 PMID:24763225


  • Das B.,Martinez E., Midonet C., and Barre F.X. Integrative mobile elements exploiting Xer recombination. Trends Microbiol. 2014, 21:23-30. PMID:23127381.


  • Pal R.R., Bag S., Dasgupta S., Das B., Bhadra R.K. Functional characterization of the stringent response regulatory gene dksA of Vibrio cholerae and its role in modulation of virulence phenotypes. J. Bacteriol. 2012, 194(20):5638-48.PMID:22904284


  • Das B.,Bischerour J., Barre F.X. VGJFintegration and excision mechanisms contribute to the genetic diversity of Vibrio cholerae epidemic strains. Proc.Natl. Acad. Sci, USA. 2011, 108:2516-2521. PMID:21262799
  • Das B., Bischerour J., Barre F.X. ­Molecular mechanism of acquisition of the cholera toxin genes. Indian J. Med. Res. 2011, 133:195-200.PMID:21415494.
  • Pal R.R., Das B., Dasgupta S., Bhadra R.K. Genetic components of stringent response in Vibrio cholerae. Indian J. Med. Res. 2011,133:212-217. PMID:21415497.
  • Majumdar T., Das B., Bhadra R.K., Dam B., Mazumder S. Complete nucleotide sequence of a quinolone resistance gene (qnrS2) carrying plasmid of Aeromonas hydrophila isolated from fish. Plasmid. 2011, 66:79-84. PMID:21664930.


  • Das B.*, Bischerour J*., Val M.E., Barre F.X. Molecular keys of the tropism of integration of the Cholera Toxin phage. Proc.Natl. Acad. Sci, USA 2010, 107:4377-4382. (Commentary in PNAS). 
  • Halder K., Das B., Nair G. B., Bhadra R.K. Molecular evidences favouring stepwise evolution of Mozambique Vibrio cholerae O1 El Tor hybrid strain. Microbiology(SGM) 2010, 156:99 107. 


  • Das B.,Pal R.R., Bag S., Bhadra R.K. Stringent response in Vibrio cholerae: genetic analysis of spoT gene function and identification of a novel (p)ppGpp synthetase gene. Mol. Microbiol. 2009. 72:380-398. PMID:19298370.


  • Das B.,Bhadra R.K. Molecular characterization of Vibrio cholerae ΔrelA ΔspoT double mutants. Arch. Micrbiol. 2008,189:227-238. PMID:17968531.
  • Shah S., Das B., Bhadra R.K. Functional analysis of the essential GTP-binding protein coding gene cgtA of Vibrio cholerae. J. Bacteriol. 2008, 190:4764-4771. PMID:18456812.
  • Bhowmick R., Ghosal A., Das B., Koley H., Saha D. R., Ganguly S., Nandy R.K., Bhadra R.K., Chatterjee N.S. Intestinal adherence of Vibrio cholerae involves a coordinated interaction between colonization factor GbpA and mucin. Infect. Immun. 2008, 76:4968-4977.PMID:18765724.


  • Das B.,Halder K., Pal P., Bhadra R.K. Small chromosomal integration site of classical CTX prophage in Mozambique Vibrio cholerae O1 biotype El Tor strain. Arch.Micrbiol. 2007, 188:677-683. PMID:17618421.


  • Maiti D., Das B.,Saha A., Nandy R.K., Nair G.B., Bhadra R.K. Genetic organization of the pre-CTX and CTX prophages in the genome of an environmental Vibrio cholerae non-O1, non-O139 strain. Microbiology (SGM) 2006, 152:3633-3641.PMID:17159216.


Research in News

(1) Nature India (July11, 2018)
Rural Indians have healthier guts than urban folks

(2) Vigyan Prasar, Dept. of Science and Technology, Govt. of India (July 19, 2018)
A peek into gut of Indians throws up surprises

(3) Dept. of Biotechnology, Govt. of India (2015)
Scientists in THSTI Develop Novel Genetic Tools to speed up Drug Discovery Research

(4) Times of India (Aug 17, 2015)
Research roundup: Vector-wise


Book/Book Chapter

  • eBook (2017): Filamentous Bacteriophage in Bio/Nano/Technology, Bacterial Pathogenesis and Ecology. Edited by: Jasna Rakonjac, Bhabatosh Das, Ratmir Derda. Publisher: Frontiers Media SA. ISBN: 9782889450954
  • Dasgupta S., Das B., Basu P., Bhadra R.K. (2016) Molecular basis of stringent response in Vibrio cholerae (Edited by Frans J. de Bruijn. John Wiley & Sons, Inc, USA). P. 507-516 Aug 2016
  • Nair G.B., Sen Gupta S., Das B.(2014). The “Uncultured” but significant world of the human gut microbiome: New metagenomic insights. In G. P. Talwar and L.M. Srivastava (Eds.), Textbook of Biochemistry and Human Biology (pp. 664-671). Delhi, India: PHI Learning Pvt. Ltd.
  • Das B.and Nair G.B. (2012). The genomics of Cholera. In ‘Genomics Applications for the Developing World’ (Eds. Karen E. Nelson & Barbara jones-Nelson) Springer publication, USA pp. 21-38, DOI: 10.1007/978-1-4614-2182-5_3.
  • Bhadra R.K., Shah S., Das B.(2010). Small Molecule Signaling Systems in Vibrio cholerae.  In ‘Epidemiological and Molecular Aspects on Cholera’ (Eds. Ramamurthy T. & Bhattacharya S. K.). Humana Press, USA, pp. 185-201.
  • Bhadra R.K. and Das B.(2008). Coordinated regulation of gene expression in Vibrio cholerae. In ‘Vibrio cholerae: Genomics and Molecular Biology’ (Eds. Faruque, S.M. & Nair, G.B). Caister Academic Press, UK, pp. 153-167.



  • BMGF Travel Grant Award to attend 52nd US-Japan Joint Panel Conference on Cholera and Other Bacterial Enteric Infections (2018)

  • Japan Society for the Promotion of Science (JSPS) Invitational Fellowship Award (2017).

  • Invited Member in World Health Organization (WHO) Expert Group for Developing “Target Product Profile for cholera Rapid Diagnostic Tests, 2017
  • Young Investigator Award (1st prize) from Yakult India Microbiota and Probiotic Science Foundation, 2016
  • CNRS Post Doctoral Research Fellowship, Govt. of France
  • CSIR Research Fellowship, Govt. of India
  • ICMR Research Fellowship, Govt. of India
  • IIT Fellowship, IIT-Kharagpur, Govt. of India

Adjunct Visiting Faculty at Kasturba Medical College, Manipal University, Manipal

Editorial Board Member

  • Frontiers in Microbiology

            (Nature publishing group)

  • Microbial Ecology