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Khurana H, Pucadyil TJ. "Gearing" up for dynamin-catalyzed membrane fission. Curr Opin Cell Biol 2023; 83:102204. [PMID: 37451176 DOI: 10.1016/j.ceb.2023.102204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 06/13/2023] [Accepted: 06/16/2023] [Indexed: 07/18/2023]
Abstract
Endocytic dynamins self-assemble into helical scaffolds and utilize energy from GTP hydrolysis to constrict and sever tubular membranous necks of budded endocytic intermediates. They bind the membrane using a pleckstrin-homology domain (PHD). The PHD is characterized by four unstructured loops, two of which partially insert into the membrane. Recent studies reveal that loop insertion lowers the bending rigidity of the membrane and that mutations in these two loops produce separable and opposite effects on the efficiency of dynamin-catalyzed membrane fission. Here, we review the current understanding of dynamin-catalyzed membrane fission and attempt to reconcile contrasting notions that have emerged from biochemical and cellular studies evaluating the role of the PHD in this process. We propose that two membrane-inserting loops act as "gears" that define the catalytic efficiency of the dynamin helical scaffold in membrane fission.
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Affiliation(s)
- Himani Khurana
- Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pashan, Pune 411008, Maharashtra, India
| | - Thomas J Pucadyil
- Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pashan, Pune 411008, Maharashtra, India.
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Khurana H, Baratam K, Bhattacharyya S, Srivastava A, Pucadyil TJ. Mechanistic analysis of a novel membrane-interacting variable loop in the pleckstrin-homology domain critical for dynamin function. Proc Natl Acad Sci U S A 2023; 120:e2215250120. [PMID: 36888655 PMCID: PMC10089193 DOI: 10.1073/pnas.2215250120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Accepted: 02/08/2023] [Indexed: 03/09/2023] Open
Abstract
Classical dynamins are best understood for their ability to generate vesicles by membrane fission. During clathrin-mediated endocytosis (CME), dynamin is recruited to the membrane through multivalent protein and lipid interactions between its proline-rich domain (PRD) with SRC Homology 3 (SH3) domains in endocytic proteins and its pleckstrin-homology domain (PHD) with membrane lipids. Variable loops (VL) in the PHD bind lipids and partially insert into the membrane thereby anchoring the PHD to the membrane. Recent molecular dynamics (MD) simulations reveal a novel VL4 that interacts with the membrane. Importantly, a missense mutation that reduces VL4 hydrophobicity is linked to an autosomal dominant form of Charcot-Marie-Tooth (CMT) neuropathy. We analyzed the orientation and function of the VL4 to mechanistically link data from simulations with the CMT neuropathy. Structural modeling of PHDs in the cryo-electron microscopy (cryo-EM) cryoEM map of the membrane-bound dynamin polymer confirms VL4 as a membrane-interacting loop. In assays that rely solely on lipid-based membrane recruitment, VL4 mutants with reduced hydrophobicity showed an acute membrane curvature-dependent binding and a catalytic defect in fission. Remarkably, in assays that mimic a physiological multivalent lipid- and protein-based recruitment, VL4 mutants were completely defective in fission across a range of membrane curvatures. Importantly, expression of these mutants in cells inhibited CME, consistent with the autosomal dominant phenotype associated with the CMT neuropathy. Together, our results emphasize the significance of finely tuned lipid and protein interactions for efficient dynamin function.
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Affiliation(s)
- Himani Khurana
- Indian Institute of Science Education and Research, Pune411008, India
| | | | | | - Anand Srivastava
- Molecular Biophysics Unit, Indian Institute of Science, Bengaluru560012, India
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Bharti M, Khurana H, Sharma M, Choksket S, Nagar S, Yadav S, Modeel S, Korpole S, Negi RK. Taxonomic and genomic characterization of Sporosarcina cyprini sp. nov., moderately tolerant of Cr +6 and Cd +2 isolated from the gut of invasive fish Cyprinus carpio var. communis (Linn., 1758). Antonie Van Leeuwenhoek 2023; 116:193-206. [PMID: 36400900 DOI: 10.1007/s10482-022-01794-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 11/02/2022] [Indexed: 11/19/2022]
Abstract
A Gram-stain-positive, motile, and rod-shaped bacterium, designated as strain MB25T, was isolated from the gut of Cyprinus carpio from the highly polluted river Yamuna, India. Phylogenetic analysis based on 16S rRNA gene sequence revealed that strain MB25T belonged to the genus Sporosarcina, sharing the highest sequence similarity with S. luteola Y1T (98.98%) and S. koreensis S-K12T (98.91%). Digital DNA-DNA hybridization and average nucleotide identity values of strain MB25T with strain Y1T and S-K12T were 18.9, 77.69, and 18.2, 76.80 respectively. Genome analysis of strain MB25T revealed its biotechnological properties such as tolerance to potent heavy metals, genes for the production of carbohydrate-active enzymes, antimicrobial compounds, and also degradation of aromatic compounds. The G + C content of strain MB25T genome was 45%. Growth observed at 10-40 °C (optimum, 28-30 °C), pH 6.0-8.5 (optimum pH 7.5-8.0); NaCl concentrations up to 6.0% (w/v). The dominant respiratory quinone was MK-7, cell wall peptidoglycan is of the A-4 type containing amino acids Lys-Glu and the major fatty acids are anteiso-C11:0 and iso-C15: 0. The major polar lipids of strain MB25T are diphosphatidylglycerol, phosphatidylglycerol, and phosphatidylethanolamine. On the basis of phenotypic, chemotaxonomic, phylogenetic, and phylogenomic data, strain MB25T represents a novel species of the genus Sporosarcina, for which the name Sporosarcina cyprini sp. nov. is proposed. The type strain is MB25T (= MCC 4366 T = JCM 34521 T = CCM 9113 T).
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Affiliation(s)
- Meghali Bharti
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, New Delhi, 110007, India
| | - Himani Khurana
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, New Delhi, 110007, India
| | - Monika Sharma
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, New Delhi, 110007, India
| | - Stanzin Choksket
- CSIR-Institute of Microbial Technology, Chandigarh, 160036, India
| | - Shekhar Nagar
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, New Delhi, 110007, India.,Deshbandhu College, University of Delhi, Delhi, 110019, India
| | - Sheetal Yadav
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, New Delhi, 110007, India
| | - Sonakshi Modeel
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, New Delhi, 110007, India
| | - Suresh Korpole
- CSIR-Institute of Microbial Technology, Chandigarh, 160036, India
| | - Ram Krishan Negi
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, New Delhi, 110007, India.
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Mitra S, Simson D, Singh S, Goyal S, Khurana H, Dewan A, Barik S, Dobriyal K, Krishnan A, Pansuriya M, Mishra M. Survival Outcomes and Patterns of Failure in Patients with Carcinoma Stomach Who Underwent D2 Lymphadenectomy Followed by Either Adjuvant Chemoradiation or Chemotherapy Alone: A Retrospective Review from a Tertiary Care Cancer Research Institute. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2022.07.1053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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5
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Mitra S, Simson D, Khurana H, Tandon S, Ahlawat P, Bansal N, Barik S, Sethi J, Chufal K, Gairola M. Impact of Radiation Treatment Delay Due to COVID-19 Pandemic. Int J Radiat Oncol Biol Phys 2022. [PMCID: PMC9595463 DOI: 10.1016/j.ijrobp.2022.07.1410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Purpose/Objective(s) To study the effect of radiation treatment delay due to COVID-19 infection. Materials/Methods This study is a descriptive analysis. We studied all patients who were COVID-19 positive while undergoing radiation treatment. In addition, those COVID-19 positive patients before the start of radiation during their neoadjuvant treatment period or surgery were also analyzed. However, patients detected with COVID-19 infection after the radiation treatment course were excluded. The study period was from June 2020 to May 2021. A radiation treatment delay was defined as a delay in starting the treatment, a break in therapy during their scheduled radiation course, or treatment discontinuation. Patients who had a radiation treatment delay were followed-up till December 2021. Results Ninety-four patients who met the criteria were identified for the analysis. Seventy-seven of them had a mild infection, while 17 had a moderate or severe infection. Of the 94 patients identified, 83 patients had a treatment delay. The median treatment delay (MTD) was 18 (6 to 47) days and the median follow-up period was 13 months. In this cohort, 66 patients were treated with a curative intent, of which 51 are on follow-up {34 patients are disease-free (MTD – 18.5, 10 to 43), seven had either a residual disease or locoregional recurrence (MTD – 22, 10 to 32), seven had distant metastasis (MTD – 18, 15 to 47), and three patients died (MTD – 20, 8 to 27)}. Amongst the three patients who died, only one died of COVID-19 infection or sequel (Case Fatality Rate, CFR – 1.06%). Conclusion The CFR due to COVID-19 infection amongst those who underwent radiotherapy was low. At the same time, higher MTD might have been the reason for residual or locoregional recurrences. However, a longer follow-up is required to confirm this. Till then, it will remain debatable whether it was worth delaying radiotherapy for mild to moderate COVID-19 infection for a significant time to cause a potential cancer treatment failure.
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Bharti M, Nagar S, Khurana H, Negi RK. Metagenomic insights to understand the role of polluted river Yamuna in shaping the gut microbial communities of two invasive fish species. Arch Microbiol 2022; 204:509. [PMID: 35859219 DOI: 10.1007/s00203-022-03127-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 07/05/2022] [Accepted: 07/06/2022] [Indexed: 11/26/2022]
Abstract
The gastrointestinal microbial community plays a crucial role in host health, immunity, protection, development and provides nutrients to the host. The rising human-induced pollution and heavy metal contamination in all aquatic systems globally has led us to explore the gut microbial diversity of two exotic invasive fish Cyprinus carpio (Linnaeus, 1858) and Oreochromis niloticus (Linnaeus,1857) from river Yamuna, India. These fishes are aquatic bioindicators with high demographic resilience. Exploring these associations would pave the way for addressing problems that inhabitant fishes are facing due to the increasing pollution load in the River Yamuna. Based on 16S rRNA gene amplicon sequencing, our results deliver comparative information on the gut microbiome of these fishes and highlight connotations between the microbiome of gut and water samples. The gut of C. carpio and O. niloticus was dominated by phyla Proteobacteria whereas Bacteroidetes dominated the water sample. Microbial communities showed predicted roles such as pathogenicity (Escherichia-Shigella, Aeromonas veronii, Vibrio cholerae, Streptococcus iniae, Flavobacterium columnare, Klebsiella pneumoniae, Mycobacterium sp.), probiotic applications (Bacillus velezensis, Lactobacillus plantarum, Enterococcus faecalis, Bifidobacterium longum, Lactococcus lactis, Leuconostoc falkenbergense) and involvement in sewage and organic matter decomposition (Nitrosomonas sp., Methanosaeta harundinacea, Dechloromonas agitata, Thauera humireducens, Zoogloea ramigera). Heavy metal degrading members (Leucobacter chromiireducens, Pseudomonas fluorescens, P. aeruginosa, Klebsiella pneumoniae, and Micrococcus luteus) were detected in gut microbiome samples thus supporting the notion that fish shapes its gut microbiota with changing ecology. Functional profiling showed that microbial communities are specialized in metabolic functions thus reflecting the dietary profile of these invasive fishes.
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Affiliation(s)
- Meghali Bharti
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Shekhar Nagar
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, 110007, India
- Deshbandhu College, University of Delhi, Delhi, India
| | - Himani Khurana
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Ram Krishan Negi
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, 110007, India.
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Simson D, Mitra S, Khurana H, Barik S, Dobriyal K, Krishnan A, Umesh P, Pathi S, Dewan A. 10P 10-year survival outcome and patterns of failure analysis of patients with localized adenocarcinoma cervix: Our experience from a tertiary cancer care center. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.04.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Sharma M, Khurana H, Singh DN, Negi RK. The genus Sphingopyxis: Systematics, ecology, and bioremediation potential - A review. J Environ Manage 2021; 280:111744. [PMID: 33280938 DOI: 10.1016/j.jenvman.2020.111744] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 11/22/2020] [Accepted: 11/24/2020] [Indexed: 06/12/2023]
Abstract
The genus Sphingopyxis was first reported in the year 2001. Phylogenetically, Sphingopyxis is well delineated from other genera Sphingobium, Sphingomonas and Novosphingobium of sphingomonads group, family Sphingomonadaceae of Proteobacteria. To date (at the time of writing), the genus Sphingopyxis comprises of twenty validly published species available in List of Prokaryotic Names with Standing in Nomenclature. Sphingopyxis spp. have been isolated from diverse niches including, agricultural soil, marine and fresh water, caves, activated sludge, thermal spring, oil and pesticide contaminated soil, and heavy metal contaminated sites. Sphingopyxis species have drawn considerable attention not only for their ability to survive under extreme environments, but also for their potential to degrade number of xenobiotics and other environmental contaminants that impose serious threat to human health. At present, genome sequence of both cultivable and non-cultivable strains (metagenome assembled genome) are available in the public databases (NCBI) and genome wide studies confirms the presence of mobile genetic elements and plethora of degradation genes and pathways making them a potential candidate for bioremediation. Beside genome wide predictions there are number of experimental evidences confirm the degradation potential of bacteria belonging to genus Sphingopyxis and also the production of different secondary metabolites that help them interact and survive in their ecological niches. This review provides detailed information on ecology, general characteristic and the significant implications of Sphingopyxis species in environmental management along with the bio-synthetic potential.
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Affiliation(s)
- Monika Sharma
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi-110007, India
| | - Himani Khurana
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi-110007, India
| | - Durgesh Narain Singh
- Bacterial Pathogenesis Laboratory, Department of Zoology, University of Delhi, Delhi-110007, India
| | - Ram Krishan Negi
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi-110007, India.
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Khurana H, Sharma M, Bharti M, Singh DN, Negi RK. Gut milieu shapes the bacterial communities of invasive silver carp. Genomics 2021; 113:815-826. [PMID: 33508444 DOI: 10.1016/j.ygeno.2021.01.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 10/12/2020] [Accepted: 01/22/2021] [Indexed: 11/29/2022]
Abstract
Silver carp is an invasive fish present in the Gobindsagar reservoir, India and has a profound impact on aquaculture. Understanding taxonomic diversity and functional attributes of gut microbiota will provide insights into the important role of bacteria in metabolism of silver carp that facilitated invasion of this exotic species. Microbial composition in foregut, midgut, hindgut and water samples was analysed using 16S rRNA gene amplicon sequencing. The bacterial communities of water samples were distinct from gut microbiota, and unique microbial assemblages were present in different regions of gut depicting profound impact of gut environment on microflora. Proteobacteria was the most abundant phyla across all samples. Ecological network analysis showed dominance of competitive interactions within posteriors region of the gut, promoting niche specialization. Predictive functional profiling revealed the microbiota specialized in digestive functions in different regions of the gut, which also reflects the dietary profile of silver carp.
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Affiliation(s)
- Himani Khurana
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi 110007, India
| | - Monika Sharma
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi 110007, India
| | - Meghali Bharti
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi 110007, India
| | | | - Ram Krishan Negi
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi 110007, India.
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Mitra S, Jajodia A, Koyyala V, Mahawar V, Dewan A, Aggarwal S, Wahi IS, Barik S, Dobriyal K, Mukhee J, Khurana H, Tripathy R, Rao A, Chaturvedi A. PH-0718: Quantitative MRI in prognosticating clinical outcomes in carcinoma cervix treated with Radiotherapy. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)00740-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Mitra S, Dewan A, Aggarwal S, Singh Wahi I, Barik S, Dobriyal K, Mukhee J, Khurana H. PO-1146: Evaluation of Dose to pelvic lymphnodes in CTbased High DoseRate Brachytherapy in Carcinoma Cervix. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)01164-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Mitra S, Barik S, Suryavanshi M, Dewan A, Aggarwal S, Kaur I, Kumar D, Khurana H, Vishwakarna G, Dobriyal K, Sharief MI, Umesh P, Jwala M, Mishra M. To Study The Role Of Pre-treatment MicroRNA Expression As A Predictor Of Response To Chemoradiation In Locally Advanced Carcinoma Cervix. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2020.07.1617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Mitra S, Aggarwal S, Dewan A, Kaur Wahi I, Barik S, Dobriyal K, Mukhee J, Jajodia A, Khurana H, Dewan A. PO-1088: Short Course Radiationtherapy chemotherapy and delayed surgery in locally advanced rectal carcinoma. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)01105-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Khurana H, Singh DN, Singh A, Singh Y, Lal R, Negi RK. Gut microbiome of endangered Tor putitora (Ham.) as a reservoir of antibiotic resistance genes and pathogens associated with fish health. BMC Microbiol 2020; 20:249. [PMID: 32787773 PMCID: PMC7425606 DOI: 10.1186/s12866-020-01911-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Accepted: 07/19/2020] [Indexed: 01/16/2023] Open
Abstract
Background Tor putitora, the largest freshwater fish of the Indian subcontinent, is an endangered species. Several factors have been attributed towards its continuous population decrease, but very little is known about the gut microbiome of this fish. Also, the fish gut microbiome serves as a reservoir of virulence factors and antibiotic resistance determinants. Therefore, the shotgun metagenomic approach was employed to investigate the taxonomic composition and functional potential of microbial communities present in the gut of Tor putitora, as well as the detection of virulence and antibiotic resistance genes in the microbiome. Results The analysis of bacterial diversity showed that Proteobacteria was predominant phylum, followed by Chloroflexi, Bacteroidetes, and Actinobacteria. Within Proteobacteria, Aeromonas and Caulobacter were chiefly present; also, Klebsiella, Escherichia, and plant symbionts were noticeably detected. Functional characterization of gut microbes endowed the virulence determinants, while surveillance of antibiotic resistance genes showed the dominance of β-lactamase variants. The antibiotic-resistant Klebsiella pneumoniae and Escherichia coli pathovars were also detected. Microbial genome reconstruction and comparative genomics confirmed the presence of Aeromonads, the predominant fish pathogens. Conclusions Gut microbiome of endangered Tor putitora consisted of both commensals and opportunistic pathogens, implying that factors adversely affecting the non-pathogenic population would allow colonization and proliferation of pathogens causing diseased state in asymptomatic Tor putitora. The presence of virulence factors and antibiotic resistance genes suggested the potential risk of dissemination to other bacteria due to horizontal gene transfer, thereby posing a threat to fish and human health. The preservation of healthy gut microflora and limited use of antibiotics are some of the prerequisites for the conservation of this imperilled species.
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Affiliation(s)
- Himani Khurana
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, 110007, India.,Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Durgesh Narain Singh
- Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, 110007, India.,Laboratory of Microbial Pathogenesis, Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Anoop Singh
- Laboratory of Microbial Pathogenesis, Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Yogendra Singh
- Laboratory of Microbial Pathogenesis, Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Rup Lal
- Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, 110007, India. .,Present address: The Energy and Resources Institute Darbari Seth Block, IHC Complex, Lodhi Road, New Delhi, 110003, India.
| | - Ram Krishan Negi
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, 110007, India.
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Khurana H, Sharma M, Verma H, Lopes BS, Lal R, Negi RK. Genomic insights into the phylogeny of Bacillus strains and elucidation of their secondary metabolic potential. Genomics 2020; 112:3191-3200. [PMID: 32512145 DOI: 10.1016/j.ygeno.2020.06.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Revised: 05/17/2020] [Accepted: 06/02/2020] [Indexed: 12/16/2022]
Abstract
The genus Bacillus constitutes a plethora of species that have medical, environmental, and industrial applications. While genus Bacillus has been the focus of several studies where genomic data have been used to resolve many taxonomic issues, there still exist several ambiguities. Through the use of in-silico genome-based methods, we tried to resolve the taxonomic anomalies of a large set of Bacillus genomes (n = 178). We also proposed species names for uncharacterized strains and reported genome sequence of a novel isolate Bacillus sp. RL. In the hierarchical clustering on genome-to-genome distances, we observed 11 distinct monophyletic clusters and investigated the functional pathways annotated as the property of these clusters and core-gene content of the entire dataset. Thus, we were able to assert the possible outlier strains (n = 17) for this genus. Analyses of secondary metabolite potential of each strain helped us unravel still unexplored diversity for various biosynthetic genes.
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Affiliation(s)
- Himani Khurana
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi 110007, India
| | - Monika Sharma
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi 110007, India
| | - Helianthous Verma
- Molecular Biology and Genomics Research Laboratory, Ramjas College, University of Delhi, Delhi 110007, India
| | - Bruno Silvester Lopes
- School of Medicine, Medical Sciences and Nutrition, Medical Microbiology, 0:025 Polwarth Building, Aberdeen AB25 2ZD, UK
| | - Rup Lal
- The Energy and Resources Institute, Darbari Seth Block, IHC Complex, Lodhi Road, New Delhi 110003, India.
| | - Ram Krishan Negi
- Fish Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi 110007, India.
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Gaur M, Vasudeva A, Singh A, Sharma V, Khurana H, Negi RK, Lee JK, Kalia VC, Misra R, Singh Y. Comparison of DNA Extraction Methods for Optimal Recovery of Metagenomic DNA from Human and Environmental Samples. Indian J Microbiol 2019; 59:482-489. [PMID: 31762512 DOI: 10.1007/s12088-019-00832-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2019] [Accepted: 10/04/2019] [Indexed: 12/19/2022] Open
Abstract
Metagenomics is the study of gene pool of an entire community in a particular niche. This provides valuable information about the functionality of host-microbe interaction in a biological ecosystem. Efficient metagenomic DNA extraction is a critical pre-requisite for a successful sequencing run in a metagenomic study. Although isolation of human stool metagenomic DNA is fairly standardized, the same protocol does not work as efficiently in fecal DNA from other organisms. In this study, we report a comparison of manual and commercial DNA extraction methods for diverse samples such as human stool, fish gut and soil. Fishes are known to have variable microbial diversity based on their food habits, so the study included two different varieties of fishes. A modified protocol for effective isolation of metagenomic DNA from human milk samples is also reported, highlighting critical precautions. Recent studies have emphasized the importance of studying functionality of human milk metagenome to understand its influence on infants' health. While manual method works well with most samples and therefore can be a method of choice for testing new samples, broad-range commercial kit offers advantage of high purity and quality. DNA extraction of different samples would go a long way in unraveling the unexplored association between microbes and host in a biological system.
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Affiliation(s)
- Mohita Gaur
- 1Department of Zoology, University of Delhi, Delhi, India
| | | | - Anoop Singh
- 1Department of Zoology, University of Delhi, Delhi, India
| | - Vishal Sharma
- 1Department of Zoology, University of Delhi, Delhi, India
| | - Himani Khurana
- 1Department of Zoology, University of Delhi, Delhi, India
| | | | - Jung-Kul Lee
- 2Department of Chemical Engineering, Konkuk University, Seoul, 05029 Republic of Korea
| | - Vipin Chandra Kalia
- 2Department of Chemical Engineering, Konkuk University, Seoul, 05029 Republic of Korea
| | - Richa Misra
- 3Department of Zoology, Sri Venkateswara College, University of Delhi, Delhi, India
| | - Yogendra Singh
- 1Department of Zoology, University of Delhi, Delhi, India
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Mahato NK, Gupta V, Singh P, Kumari R, Verma H, Tripathi C, Rani P, Sharma A, Singhvi N, Sood U, Hira P, Kohli P, Nayyar N, Puri A, Bajaj A, Kumar R, Negi V, Talwar C, Khurana H, Nagar S, Sharma M, Mishra H, Singh AK, Dhingra G, Negi RK, Shakarad M, Singh Y, Lal R. Microbial taxonomy in the era of OMICS: application of DNA sequences, computational tools and techniques. Antonie Van Leeuwenhoek 2017; 110:1357-1371. [PMID: 28831610 DOI: 10.1007/s10482-017-0928-1] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Accepted: 08/10/2017] [Indexed: 02/06/2023]
Abstract
The current prokaryotic taxonomy classifies phenotypically and genotypically diverse microorganisms using a polyphasic approach. With advances in the next-generation sequencing technologies and computational tools for analysis of genomes, the traditional polyphasic method is complemented with genomic data to delineate and classify bacterial genera and species as an alternative to cumbersome and error-prone laboratory tests. This review discusses the applications of sequence-based tools and techniques for bacterial classification and provides a scheme for more robust and reproducible bacterial classification based on genomic data. The present review highlights promising tools and techniques such as ortho-Average Nucleotide Identity, Genome to Genome Distance Calculator and Multi Locus Sequence Analysis, which can be validly employed for characterizing novel microorganisms and assessing phylogenetic relationships. In addition, the review discusses the possibility of employing metagenomic data to assess the phylogenetic associations of uncultured microorganisms. Through this article, we present a review of genomic approaches that can be included in the scheme of taxonomy of bacteria and archaea based on computational and in silico advances to boost the credibility of taxonomic classification in this genomic era.
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Affiliation(s)
| | - Vipin Gupta
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Priya Singh
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Rashmi Kumari
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | | | - Charu Tripathi
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Pooja Rani
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Anukriti Sharma
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Nirjara Singhvi
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Utkarsh Sood
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Princy Hira
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Puneet Kohli
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Namita Nayyar
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Akshita Puri
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Abhay Bajaj
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Roshan Kumar
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Vivek Negi
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Chandni Talwar
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Himani Khurana
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Shekhar Nagar
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Monika Sharma
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Harshita Mishra
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Amit Kumar Singh
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Gauri Dhingra
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Ram Krishan Negi
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | | | - Yogendra Singh
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Rup Lal
- Department of Zoology, University of Delhi, Delhi, 110007, India.
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Tripathi C, Mishra H, Khurana H, Dwivedi V, Kamra K, Negi RK, Lal R. Complete Genome Analysis of Thermus parvatiensis and Comparative Genomics of Thermus spp. Provide Insights into Genetic Variability and Evolution of Natural Competence as Strategic Survival Attributes. Front Microbiol 2017; 8:1410. [PMID: 28798737 PMCID: PMC5529391 DOI: 10.3389/fmicb.2017.01410] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 07/11/2017] [Indexed: 01/27/2023] Open
Abstract
Thermophilic environments represent an interesting niche. Among thermophiles, the genus Thermus is among the most studied genera. In this study, we have sequenced the genome of Thermus parvatiensis strain RL, a thermophile isolated from Himalayan hot water springs (temperature >96°C) using PacBio RSII SMRT technique. The small genome (2.01 Mbp) comprises a chromosome (1.87 Mbp) and a plasmid (143 Kbp), designated in this study as pTP143. Annotation revealed a high number of repair genes, a squeezed genome but containing highly plastic plasmid with transposases, integrases, mobile elements and hypothetical proteins (44%). We performed a comparative genomic study of the group Thermus with an aim of analysing the phylogenetic relatedness as well as niche specific attributes prevalent among the group. We compared the reference genome RL with 16 Thermus genomes to assess their phylogenetic relationships based on 16S rRNA gene sequences, average nucleotide identity (ANI), conserved marker genes (31 and 400), pan genome and tetranucleotide frequency. The core genome of the analyzed genomes contained 1,177 core genes and many singleton genes were detected in individual genomes, reflecting a conserved core but adaptive pan repertoire. We demonstrated the presence of metagenomic islands (chromosome:5, plasmid:5) by recruiting raw metagenomic data (from the same niche) against the genomic replicons of T. parvatiensis. We also dissected the CRISPR loci wide all genomes and found widespread presence of this system across Thermus genomes. Additionally, we performed a comparative analysis of competence loci wide Thermus genomes and found evidence for recent horizontal acquisition of the locus and continued dispersal among members reflecting that natural competence is a beneficial survival trait among Thermus members and its acquisition depicts unending evolution in order to accomplish optimal fitness.
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Affiliation(s)
- Charu Tripathi
- Department of Zoology, University of DelhiNew Delhi, India
| | | | - Himani Khurana
- Department of Zoology, University of DelhiNew Delhi, India
| | | | - Komal Kamra
- Ciliate Biology Laboratory, Sri Guru Tegh Bahadar Khalsa College, University of DelhiNew Delhi, India
| | - Ram K Negi
- Department of Zoology, University of DelhiNew Delhi, India
| | - Rup Lal
- Department of Zoology, University of DelhiNew Delhi, India
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Exposto CR, Oz U, Callard JS, Allen MJ, Khurana H, Atri AD, Mo X, Fernandez SA, Tatakis DN, Edmonds K, Westgate PM, Huja SS. Oncologic doses of zoledronic acid induce site specific suppression of bone modelling in rice rats. Orthod Craniofac Res 2017. [PMID: 28643933 DOI: 10.1111/ocr.12164] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVES To examine the effect of zoledronic acid (ZOL) on cortical bone modelling and healing of extraction sockets in the jaw bones of a rodent model. We hypothesized ZOL suppresses both the bone formation in the modelling mode in the jaw bones and alters the extraction site healing. MATERIAL & METHODS Rice rats were administered saline solution and two dose regimens of ZOL: 0.1 mg/kg, twice a week, for 4 weeks (n=17, saline=8 & ZOL=9) and a higher dose of 0.4 mg/kg, weekly, for 9 weeks (n=30, saline=15 & ZOL=15). Two pairs of fluorochrome bone labels were administered. Extraction of maxillary teeth was performed in maxilla. Mineral apposition rate, mineralizing surface and bone formation rate (BFR) were quantified on periodontal (PDL), alveolar and basal bone surfaces, and in the trabecular bone of proximal tibia. Bone volume (BV) was evaluated at extraction sockets. Multivariate Gaussian models were used to account for repeated measurements, and analyzes were conducted in SAS V9.3. RESULTS ZOL suppressed bone modelling (BFR/BS) at the PDL surfaces in the mandible (P<.05), but its effect was not significant at the periosteal surfaces of both jaws. BV for the healing sockets of ZOL treated animals was not significantly different (P=.07) compared to the saline group. ZOL suppressive effect was higher in the tibia compared to the jaws. CONCLUSION ZOL severely suppresses coupled remodelling in the tibia, and the suppression of bone formation in the modelling mode in the jaws demonstrates the site specific effects of ZOL in rice rats.
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Affiliation(s)
- C R Exposto
- Section of Orthodontics, Aarhus University, Aarhus, Denmark
| | - U Oz
- Department of Orthodontics, Near East University, North Nicosia, Northern Cyprus
| | - J S Callard
- Veterinary Medicine, The Ohio State University, Columbus, OH, USA
| | - M J Allen
- Veterinary Medicine, The Ohio State University, Columbus, OH, USA
| | - H Khurana
- Division of Orthodontics, The Ohio State University, Columbus, OH, USA
| | - A D' Atri
- Division of Orthodontics, The Ohio State University, Columbus, OH, USA
| | - X Mo
- Biostatistics, The Ohio State University, Columbus, OH, USA
| | - S A Fernandez
- Biostatistics, The Ohio State University, Columbus, OH, USA
| | - D N Tatakis
- Periodontics, The Ohio State University, Columbus, OH, USA
| | - K Edmonds
- School of Natural Sciences, Indiana University Southeast, New Albany, IN, USA
| | - P M Westgate
- Department of Biostatistics, University of Kentucky, Lexington, KY, USA
| | - S S Huja
- Division of Orthodontics, College of Dentistry, University of Kentucky, Lexington, KY, USA
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Khurana H, Pandey RK, Saksena AK, Kumar A. An evaluation of Vitamin E and Pycnogenol in children suffering from oral mucositis during cancer chemotherapy. Oral Dis 2012; 19:456-64. [PMID: 23078515 DOI: 10.1111/odi.12024] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2012] [Revised: 08/22/2012] [Accepted: 08/27/2012] [Indexed: 11/30/2022]
Abstract
OBJECTIVE The purpose of the present study was to evaluate and compare the effectiveness of Vitamin E (E) and Pycnogenol (P) in treatment of Chemotherapy-Related Oral Mucositis (ChROM) in children. MATERIALS AND METHODS A total of 72 children, aged between 6 and 15 years, with ChROM were selected and randomly divided into three groups after assessment of oral mucositis (OM) by WHO grading system. Glycerine (control), E, and P were topically applied in group I, II, and III, respectively, and the prognosis of OM was assessed by functional, objective, and subjective parameters. RESULTS Patients of group II and III showed significant improvement when ChROM was analyzed through scoring systems - WHO grading, Oral Mucositis Assessment Scale (OMAS), and Children's International Mucositis Evaluation Scale (ChIMES) as compared to group I (P < 0.001); however, there was no significant difference between groups II and III. CONCLUSION Both the drugs E and P per se are effective for treatment of OM with P being not effective for the treatment of severe mucositis (grade 4). Combination of E and P and additional agents may be tried for better results.
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Affiliation(s)
- H Khurana
- Department of Pedodontics and Preventive Dentistry, Faculty of Dental Sciences, Chhatrapati Shahuji Maharaj Medical University, Lucknow, Uttar Pradesh, India
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Varma PP, Khurana H, Hooda AK, Marwaha V, Badwal S. Renal thrombotic microangiopathy and cerebral venous thrombosis in a young man. Natl Med J India 2007; 20:297-299. [PMID: 18335796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We report a patient of primary catastrophic antiphospholipid syndrome who presented with rapidly progressive renal failure and seizures. He was detected to have thrombotic microangiopathy on kidney biopsy and deep cerebral venous thrombosis. The patient was successfully managed with anticoagulants, steroids, plasmapheresis and cyclophosphamide.
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Affiliation(s)
- P P Varma
- Department of Nephrology, Army Hospital (Research and Referral), Delhi Cantt, New Delhi 110010, India
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Sharma P, Vohra AK, Khurana H. Treatment seeking behavior of mentally ill patients in a rural area: A cross-sectional study. Indian J Community Med 2007. [DOI: 10.4103/0970-0218.37699] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Vohra AK, Yadav BS, Khurana H. A study of psychiatric comorbidity in alcohol dependence. Indian J Psychiatry 2003; 45:247-50. [PMID: 21206867 PMCID: PMC2952373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The diagnosis of comorbid psychiatric conditions have important clinical ramifications as the outcome is poorer with multiple disorders. Various studies have shown that alcohol abuse has severe adverse effects on the course of metal illness and vice versa. Only a little data on the subject are available from our country. We interviewed 30 patients suffering from alcohol dependence using SCID - I & SCID - II. Seventy six percent of the sample had axis - I comorbid diagnosis and 40% had an axis -II diagnoses. Depressive disorder and cluster B personality disorders were the most common comorbid diagnosis.
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Affiliation(s)
- A K Vohra
- A.K. VOHRA MD, MNAMS, Professor & Head; Dr. Vidya Sagar Deptt of Psychiatry. Pt. B. D. Sharma Post Graduate Institute of Medical Science, Rohtak-124001 (Haryana)
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Mittal S, Devi U, Mittal RN, Khurana H. CERVIX SELF EXAMINATION: MYTH OR REALITY≔ INDIAN PERSPECTIVE. Int J Gynecol Cancer 2003. [DOI: 10.1136/ijgc-00009577-200303001-00338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Mattoo SK, Varma VK, Singh RA, Khurana H, Kaur R, Sharma SK. Alienation, sensation seeking and multiphasic personality questionnaire profile in men being treated for alcohol and/or opioid dependence. Indian J Psychiatry 2001; 43:317-26. [PMID: 21407879 PMCID: PMC2956240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
Two hundred and thirty men, being treated for ICD-10 diagnosed dependence on alcohol, opioids or both, were studied 2-4 weeks after the last use of alcohol or opioids. Alienation Scale, Sensation Seeking Scale and Muliphasic Personality Questionnaire (MPQ), and selected sociodemographic and family history data were studied. All three groups showed high alienation (more in opioid cases), high sensation seeking (more in alcohol cases, more for boredom susceptibility), and a disturbed MPQ profile. The dual dependence group was similar to opioid group for age, but closer to alcohol group in terms of personality profile. Only alcohol cases showed a significantly positive correlation between alienation and sensation seeking- in terms of total scale, and boredom susceptibility and disinhibition subscales only. Thus, substance specificity was not reflected prominently in the inter-relationships between alienation, sensation seeking and MPQ scores, and sociodemographic variables.
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Affiliation(s)
- S K Mattoo
- SURENDRA K. MATTOO, MD., Additional Professor, Department of Psychiatry, Postgraduate Institute of Medical Education and Research, Chandigarh-160012
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Basu D, Marudkar M, Khurana H. Abuse of neuroleptic drug by psychiatric patients. Indian J Med Sci 2000; 54:59-62. [PMID: 11271726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Due to the depaminergic neurotrasmission in the mesocortical and mesolimbic reward systems, the neuroleptic drugs have been considered free from the risk of abuse or dependence because of their antidopaminergic properties. Here, two cases of neuroleptic abuse have been described and a possibility of reward circuits other than mesocortical and mesolimbic systems operational behind this phenomenon has been postulated. There is a need to clinically recognise the abuse potential of neuroleptic drugs.
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Affiliation(s)
- D Basu
- Department of Psychiatry, PGIMER, Chandigarh-160 012, India
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Mattoo SK, Khurana H. Huntington's disease and alcohol abuse. Neurol India 1999; 47:68-70. [PMID: 10339714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
The dopamine, glutamate and GABA systems are known to mediate the effects of alcohol on the movement disorders, though their exact roles are not clear. Thus, use of alcohol has implications for pathogenesis as well as management of the movement disorders. These implications are discussed citing a patient who had a strong family history of Huntington's disease and in whom movement disorder and behavioral problems were manifest under alcohol use and withdrawal, but not while being abstinent.
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Affiliation(s)
- S K Mattoo
- Department of Psychiatry, Postgraduate Institute of Medical Education and Research, Chandigarh, U.T., 160012, India
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Abstract
BACKGROUND Theorists differ in their opinion whether interpersonal difficulties in depression is associated more with perceptual impairment or with emotional bias. The present study intended to resolve such differences of opinion. METHOD Major depressives, general medical patients, and non-patient controls were administered three visuospatial and two affective tasks to examine the nature of performance deficit associated with each group. RESULTS Major depressives were found significantly impaired in both visuospatial and affective tasks in comparison to general medical patients, who in turn, were impaired than non-patient controls. CONCLUSION Major depressives' perceptual deficit is pervasive and not specific to affective categories. LIMITATION The study could have been more informative if more psychiatric groups had been included as subjects. CLINICAL RELEVANCE Improvement in depressives' ability for visuospatial and affective tasks may be considered as a marker of their clinical improvement.
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Affiliation(s)
- H S Asthana
- Department of Psychology, Banaras Hindu University, Varanasi, India
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