Publications by authors named "Rashmita Das"

Article Synopsis
  • A case study discusses a 32-year-old man with weakened immunity due to kidney transplants, who had a prolonged positive test for SARS-CoV-2.
  • Genome sequencing of samples taken 12 days apart identified the BA.1.1 Omicron variant and showed viral mutations changing over time.
  • The report stresses the importance of ongoing monitoring for immunocompromised individuals, as they could contribute to the emergence of new viral strains that might evade immune responses.
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Introduction: The thymus is essential for the maturation of T-lymphocytes, crucial for adaptive immunity. In neonates, thymic development is influenced by factors such as gestational age, birth weight, birth length, etc. Ultrasonography offers a non-invasive method to assess thymic size and morphology.

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Background:  Following the emergence of the JN.1 SARS-CoV-2 variant, variants with key mutations in the spike protein, such as L455F, F456L, and R346T, were identified. In early January 2024, the KP.

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Background and objective Anemia, particularly iron deficiency anemia (IDA), presents a significant global health challenge, particularly among children under the age of five years in developing nations. Concurrently, febrile convulsions (FC) affect up to 5% of neurologically healthy children aged 6-60 months, causing considerable distress among parents. There is a suggested correlation between fever and iron deficiency, which may exacerbate neurological risks, potentially lowering seizure thresholds and increasing the risk of FC.

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Background: In August 2023, the BA.2.86 SARS-CoV-2 variant, with over 30 spike protein mutations, emerged amidst the global dominance of XBB sub-lineages.

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Article Synopsis
  • The study focused on the emergence and characterization of SARS-CoV-2 variants in Maharashtra, India, during the early second wave of COVID-19.
  • A total of 189 amino-acid mutations were identified from samples, with Clade 20A being the most prevalent and a significant presence of immune-escape mutations like D614G.
  • The findings highlight the importance of ongoing genomic surveillance to track the evolving variants and their potential impact on public health.
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Background: Post-COVID-19 conditions (PCC) have emerged as a significant global health concern due to their potential impact on patients' quality of life and healthcare resources. The present study aims to understand the burden and characteristics of PCC in Maharashtra, India, and compares its prevalence among cases infected with Delta and Omicron variants.

Material And Methods: A retrospective observational study included 617 laboratory-confirmed Delta and Omicron variant cases.

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Background SARS-CoV-2 has evolved rapidly, resulting in the emergence of lineages with a competitive advantage over one another. Co-infections with different SARS-CoV-2 lineages can give rise to recombinant lineages. To date, the XBB lineage is the most widespread recombinant lineage worldwide, with the recently named XBB.

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Background: Modern response to pandemics, critical for effective public health measures, is shaped by the availability and integration of diverse epidemiological outbreak data. Tracking variants of concern (VOC) is integral to understanding the evolution of SARS-CoV-2 in space and time, both at the local level and global context. This potentially generates actionable information when integrated with epidemiological outbreak data.

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Background The SARS-CoV-2 Omicron variant, within two months of its detection, replaced the Delta variant to become the dominant circulating variant globally. Therefore, it is essential to understand the characteristics of the disease caused by the variant and its impact on vaccination. Methods A total of 165 confirmed Omicron cases attending a tertiary care hospital in Pune, Maharashtra, between December 2021 to February 2022 were studied.

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Background SARS-CoV-2 has evolved to produce new variants causing successive waves of infection. Currently, six variants are being monitored by the World Health Organization that are replacing BA.5.

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TRPV4 is a polymodal and non-selective cation channel that is activated by multiple physical and chemical stimuli. >50 naturally occurring point-mutation of TRPV4 have been identified in human, most of which induce different diseases commonly termed as channelopathies. While, these mutations are either "gain-of-function" or "loss-of-function" in nature, the exact molecular and cellular mechanisms behind such diverse channelopathies are largely unknown.

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The present cross-sectional study aims to understand the fungal community composition of the nasopharyngeal region of SARS-CoV-2 infected individuals and how the infection influences the mycobiome therein. The infection significantly (p < 0.05) influenced the alpha diversity.

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TRPV4 is a non-selective cation channel that belongs to the TRP super family. This channel can be activated by physiological temperatures and mechanical stimuli. In addition, TRPV4 is modulated by several endogenous mediators including specific lipids, cholesterol and their metabolic products.

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Context: Viral hepatitis caused 1.34 million deaths in 2015, a number comparable to the deaths caused by tuberculosis and higher than that caused by human immunodeficiency virus (HIV). Hepatitis A virus (HAV) and hepatitis E virus (HEV) are important causes of acute viral hepatitis (AVH) and acute liver failure (ALF).

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Background The Omicron variant of SARS-CoV-2 infection was seen to be more infectious but less severe in children than adults with reduced hospitalization rates. There is a paucity of data on hospitalized children with confirmed Omicron variant. Objective We describe demographic, epidemiologic, clinical, radiological, laboratory features and outcomes of children with confirmed Omicron variant of SARS-CoV-2 infection admitted to a tertiary care teaching hospital in Pune, India.

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Article Synopsis
  • TRPV1 has evolved specific amino acid patterns at the Lipid-Water-Interface (LWI), maintaining a consistent balance of hydrophobic-hydrophilic and charge residues critical for its function in vertebrates.
  • The Arg575 residue is vital for TRPV1's surface expression and localization; mutations here can disrupt charge balance, leading to increased lethality in cells.
  • Restoring the charge ratio or using specific TRPV1 inhibitors can rescue the negative effects caused by the Arg575Asp mutation, highlighting the mutation's role in keeping TRPV1 in a potentially harmful "constitutive-open-like" state.
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The importance of TRPV4 in physiology and disease has been reported by several groups. Recently we have reported that TRPV4 localizes in the mitochondria in different cellular systems, regulates mitochondrial metabolism and electron transport chain functions. Here, we show that TRPV4 colocalizes with Cytochrome C (Cyt C), both in resting as well as in activated conditions.

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The novel coronavirus, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), is causing a severe global health emergency owing to its highly infectious nature. Although the symptoms of SARS-CoV-2 are well known but its impact on nasopharyngeal microbiome is poorly studied. The present cross-sectional study was intended to understand the perturbation in the nasopharyngeal microbiome composition within the infected (n = 63) and non-infected (n = 26) individuals using 16S rRNA gene based targeted amplicon sequencing and their association with host types and the prevalence of opportunistic pathogens at the stage of infection.

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A major limitation in the bio-medical sector is the availability of materials suitable for bone tissue engineering using stem cells and methodology converting the stochastic biological events towards definitive as well as efficient bio-mineralization. We show that osteoblasts and Bone Marrow-derived Mesenchymal Stem Cell Pools (BM-MSCP) express TRPM8, a Ca-ion channel critical for bone-mineralization. TRPM8 inhibition triggers up-regulation of key osteogenesis factors; and increases mineralization by osteoblasts.

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Transient receptor potential Vanilloid ion channel sub type 4 (TRPV4) is involved in complex Ca-signaling. At least one copy of TRPV4 is present in all vertebrates and is involved in several physiological processes including sensory process and point mutations in TRPV4 leads to development of different pathophysiological disorders in human. R616Q mutant of TRPV4 has been referred as "gain-of-function" mutant causing abnormality in bone cells and develop pathophysiological condition known as "Brachyolmia".

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Herein, we demonstrate the preparation of highly luminescent carbon quantum dots (CQDs) from Aloe vera leaf gel; in just 2h at 250°C through carbonization pathway. The prepared CQDs are structurally characterized with high resolution transmission electron microscopy (HRTEM), hydrodynamic diameter, surface polarity, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Raman, UV-visible absorption spectrophotometry and fluorescence spectroscopy. The functional carbon nanoparticles are observed as non-cytotoxic materials.

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Article Synopsis
  • - A graphite paste electrode modified with nitrogen-doped porous carbon (NDPC) effectively detects paracetamol (PCM), ascorbic acid (AA), and p-aminophenol (PAP) at low concentrations.
  • - NDPC is created by carbonizing a melamine-formaldehyde resin mixed with zinc acetate, resulting in a porous structure with pore sizes around 3.14 nm and 8.12 nm.
  • - The detection limits for PCM, AA, and PAP are 30 nM, 720 nM, and 10 nM, respectively, and the method shows good sensitivity for analyzing urine and pharmaceutical products.
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