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Vijay P, Panwar D, Narwal R, Sehgal N. Structural modeling and gene expression analysis of phosvitinless vitellogenin (vgc) in the Indian freshwater murrel, Channa punctatus (Bloch, 1793). Gen Comp Endocrinol 2024; 352:114491. [PMID: 38494038 DOI: 10.1016/j.ygcen.2024.114491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 03/04/2024] [Accepted: 03/06/2024] [Indexed: 03/19/2024]
Abstract
Vitellogenin (Vg) is a female-specific egg-yolk precursor protein, synthesized in the liver of fish in response to estrogens. In the present study, complete gene of phosvitinless vitellogenin (vgc) was sequenced, its 3D structure was predicted and validated by web-based softwares. The complete nucleotide sequence of vgc was 4126 bp which encodes for 1272 amino acids and showed the presence of three conserved domains viz. LPD_N, DUF1943 and DUF1944. The retrieved amino acid sequence of VgC protein was subjected to in silico analysis for understanding the structural and functional properties of protein. mRNA levels of multiple vg genes have also been quantified during annual reproductive cycle employing qPCR. A correlation has been observed between seasonal changes in gonadosomatic index with estradiol levels and hepatic expression of three types of vg genes (vga, vgb, vgc) during ovarian cycle of murrel. During preparatory phase, when photoperiod and temperature are low; low titre of E2 in blood induces expression of vgc gene. A rapid increase in the levels of E2 favours induction of vgb and vga genes in liver of murrel during early pre-spawning phase when photoperiod is long and temperature is high in nature. These results suggest that among three vitellogenin proteins, VgC is synthesized earlier than VgA and VgB during oogenesis.
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Affiliation(s)
- Pooja Vijay
- Department of Zoology, University of Delhi, Delhi 110007, India
| | - Deepak Panwar
- Center for Individualized Medicine, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA
| | - Ritu Narwal
- Department of Zoology, University of Delhi, Delhi 110007, India
| | - Neeta Sehgal
- Department of Zoology, University of Delhi, Delhi 110007, India.
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Narwal R, Laxmi RK, Rawat VS, Sehgal N. Molecular cloning and bioinformatic characterization of Gonadotropin Inhibitory Hormone (GnIH) and its receptors in the freshwater murrel, Channa punctatus (Bloch, 1793). FISH PHYSIOLOGY AND BIOCHEMISTRY 2023; 49:711-736. [PMID: 37462854 DOI: 10.1007/s10695-023-01211-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Accepted: 06/22/2023] [Indexed: 08/11/2023]
Abstract
Gonadotropin inhibitory hormone belonging to the RFamide peptide family, a hypothalamic neuropeptide, regulates Hypothalamus-pituitary-gonadal (HPG) axis and inhibits gonadal development. GnIH polypeptide precursor has an Arg-Phe-NH2 (RFamide) motif at the C-terminal, which has LPXRF (X = Q or L) domain. The actions of GnIH are mediated through G-protein coupled receptors and upto three receptors have been characterized in many teleosts. GnIH exerts its inhibitory effect on the HPG axis through direct interaction with GnRH and Kisspeptin neurons in the brain and acts directly on the pituitary gonadotrophs. To decipher the role of GnIH in Indian freshwater murrel, Channa punctatus, we sequenced the cDNA encoding GnIH and its two receptors. The identified GnIH mRNA encodes three RFamide peptides having -MPMRF, -MPQRF, and -LPQRFamide motifs. In silico analysis of the amino acid sequence of GnIH exhibits its molecular and functional properties and the protein-protein interaction with significant factors regulating the HPG axis. The 3-D structure of GnIH and its receptors, provides more relevant information about the active residues of these proteins which might be involved in their functioning and interaction with other proteins. Molecular dynamic simulation of GnIH protein has provided more insight into its dynamic behavior. The expression of GnIH and its receptors, shows an inverse correlation with gonadal development during the annual reproductive cycle.
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Affiliation(s)
- Ritu Narwal
- Department of Zoology, University of Delhi, Delhi, India, 110007
| | | | | | - Neeta Sehgal
- Department of Zoology, University of Delhi, Delhi, India, 110007.
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Sharma L, Pipil S, Rawat VS, Sehgal N. Role of cathepsins B and D in proteolysis of yolk in the catfish Clarias gariepinus. FISH PHYSIOLOGY AND BIOCHEMISTRY 2022; 48:749-765. [PMID: 35482165 DOI: 10.1007/s10695-022-01062-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 03/04/2022] [Indexed: 06/14/2023]
Abstract
Yolk processing pathways vary in the oocytes of benthophil and pelagophil teleosts. The present study investigated the yolk processing pattern in the oocytes of the fresh water catfish Clarias gariepinus at vitellogenic, maturation, and ovulated stages. This study concludes that during maturation stage, an electrophoretic shift in the major peptide band on Polyacrylamide gel electrophoresis (PAGE) occurs due to a decrease in the size of the yolk protein. The PMF spectrum of corresponding peptides from vitellogenic and ovulated oocytes revealed a difference in the minor ions. A minor difference in the molecular weight of the corresponding peptides occurs due to a difference in their amino acid composition. Maximal activity of the proteases cathepsin D and cathepsin B was observed in the vitellogenic oocytes, thus confirming their role in the processing of yolk. A significant transient increase in the activity of cathepsin B in the mature oocytes also suggests its role in oocyte maturation.
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Affiliation(s)
- Luni Sharma
- Maitreyi College, University of Delhi, Delhi, 110021, India
| | - Supriya Pipil
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | | | - Neeta Sehgal
- Department of Zoology, University of Delhi, Delhi, 110007, India.
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Pipil S, Kumar V, Rawat VS, Sharma L, Sehgal N. In silico and in vivo analysis of binding affinity of estrogens with estrogen receptor alpha in Channa punctatus (Bloch). FISH PHYSIOLOGY AND BIOCHEMISTRY 2015; 41:31-40. [PMID: 25366672 DOI: 10.1007/s10695-014-0003-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Accepted: 10/13/2014] [Indexed: 06/04/2023]
Abstract
In the present study, potential interaction between natural estrogens i.e., estrone (E(1)), estradiol (E(2)) and estriol (E(3)) with human estrogen receptor (hER) was seen by in silico study. Molecular docking studies were carried out using Glide and ligand docking program. The binding affinity, assessed by Glide score, indicates stronger interaction of E(3) with hER followed by E(2) and E(1). Real-time PCR analysis of vga and vgb expressions, in the liver of different groups of Channa punctatus injected with the three natural estrogens, supported the docking analysis and indicated E(3) to be the most potent estrogen in inducing vga and vgb expressions followed by E(2) and E(1). This study lays the groundwork for studying interactions of various estrogenic substances with different estrogen receptors and to assess estrogenicity of various chemicals which are being released into the environment by employing molecular docking technique.
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Affiliation(s)
- S Pipil
- Department of Zoology, University of Delhi, Delhi, 110007, India
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Pipil S, Rawat VS, Sharma L, Sehgal N. Characterization of incomplete vitellogenin (VgC) in the Indian freshwater murrel, Channa punctatus (Bloch). FISH PHYSIOLOGY AND BIOCHEMISTRY 2015; 41:107-117. [PMID: 25389068 DOI: 10.1007/s10695-014-0009-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Accepted: 10/31/2014] [Indexed: 06/04/2023]
Abstract
A novel incomplete vitellogenin (VgC) was purified from the plasma of estradiol-treated male murrel, Channa punctatus, by gel filtration chromatography. The native mass of VgC protein was 180 kDa, and it resolved as a single peptide of 100 kDa on SDS-PAGE. The peptide on subjecting to matrix-assisted laser desorption/ionization-time of flight produced a peptide mass fingerprint. On tandem mass spectrometry, some of these peptides showed mass to charge (m/z) ratio and amino acid sequence similarity with VgC peptides of other teleosts. Phylogenetic analysis revealed a similarity of murrel VgC with fish species of the order Perciformes. Semi-quantitative RT-PCR assay was developed to study expression of vgc gene at variable levels of estradiol exposure. Presence of VgC in males indicates that fish has been exposed to estrogens; hence, it can be used as a biomarker for estrogenic exposure.
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Affiliation(s)
- S Pipil
- Department of Zoology, University of Delhi, Delhi, 110007, India
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Maradonna F, Nozzi V, Dalla Valle L, Traversi I, Gioacchini G, Benato F, Colletti E, Gallo P, Di Marco Pisciottano I, Mita DG, Hardiman G, Mandich A, Carnevali O. A developmental hepatotoxicity study of dietary bisphenol A in Sparus aurata juveniles. Comp Biochem Physiol C Toxicol Pharmacol 2014; 166:1-13. [PMID: 24981242 DOI: 10.1016/j.cbpc.2014.06.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Revised: 06/11/2014] [Accepted: 06/17/2014] [Indexed: 02/07/2023]
Abstract
Previous studies in rats have indicated that a diet enriched with Bisphenol A adversely effects metabolism and reproductive success. In rats exposed to BPA by maternal gavage, alteration in the developmental programming, higher obesity rates and reproductive anomalies were induced. Starting with this evidence, the aim of this study was to provide important insights on the effects induced by a BPA enriched diet, on the reproductive physiology and metabolism of juvenile fish, simulating the scenario occurring when wild fish fed on prey contaminated with environmental BPA. Seabream was chosen as model, as it is one of the primary commercial species valued by consumers and these results could provide important findings on adverse effects that could be passed on to humans by eating contaminated fish. A novel method for measuring BPA in the food and water by affinity chromatography was developed. Analysis of signals involved in reproduction uncovered altered levels of vtg and Zp, clearly indicating the estrogenic effect of BPA. Similarly, BPA up-regulated catd and era gene expression. A noteworthy outcome from this study was the full length cloning of two vtg encoding proteins, namely vtgA and vtgB, which are differently modulated by BPA. Cyp1a1 and EROD activity were significantly downregulated, confirming the ability of estrogenic compounds to inhibit the detoxification process. GST activity was unaffected by BPA contamination, while CAT activity was down regulated. These results collectively confirm the estrogenic effect of BPA and provide additional characterization of novel vtg genes in Sparus aurata.
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Affiliation(s)
- Francesca Maradonna
- Dipartimento di Scienze della Vita e dell'Ambiente, Università Politecnica delle Marche, 60131 Ancona, Italy
| | - Valentina Nozzi
- Dipartimento di Scienze della Vita e dell'Ambiente, Università Politecnica delle Marche, 60131 Ancona, Italy
| | | | - Ilaria Traversi
- Dipartimento di Scienze della Terra, dell'Ambiente e della Vita, Università di Genova, 16132 Genova, Italy; INBB Consorzio Interuniversitario di Biosistemi e Biostrutture, 00136 Roma, Italy
| | - Giorgia Gioacchini
- Dipartimento di Scienze della Vita e dell'Ambiente, Università Politecnica delle Marche, 60131 Ancona, Italy
| | - Francesca Benato
- Dipartimento di Biologia, Università di Padova, 35131 Padova, Italy
| | - Elisa Colletti
- Dipartimento di Biologia, Università di Padova, 35131 Padova, Italy
| | - Pasquale Gallo
- INBB Consorzio Interuniversitario di Biosistemi e Biostrutture, 00136 Roma, Italy; Dipartimento di Chimica, Istituto Zooprofilattico Sperimentale del Mezzogiorno, 80055 Portici (NA), Italy
| | | | - Damiano G Mita
- INBB Consorzio Interuniversitario di Biosistemi e Biostrutture, 00136 Roma, Italy
| | - Gary Hardiman
- Department of Medicine, Medical University of South Carolina, Charleston, SC, USA; Computational Science Research Center Biomedical Informatics Research Center, San Diego State University, San Diego, CA, USA
| | - Alberta Mandich
- Dipartimento di Scienze della Terra, dell'Ambiente e della Vita, Università di Genova, 16132 Genova, Italy; INBB Consorzio Interuniversitario di Biosistemi e Biostrutture, 00136 Roma, Italy
| | - Oliana Carnevali
- Dipartimento di Scienze della Vita e dell'Ambiente, Università Politecnica delle Marche, 60131 Ancona, Italy; INBB Consorzio Interuniversitario di Biosistemi e Biostrutture, 00136 Roma, Italy.
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