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Vijay P, Sehgal N. Structural analysis and characterization of egg-envelope in the Indian freshwater murrel, Channa punctatus. FISH PHYSIOLOGY AND BIOCHEMISTRY 2020; 46:1847-1856. [PMID: 32535727 DOI: 10.1007/s10695-020-00834-4] [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: 08/14/2019] [Accepted: 06/02/2020] [Indexed: 06/11/2023]
Abstract
Egg-envelope, an acellular coat, surrounds the egg and is essential for vitellogenin incorporation. It also plays a pivotal role during fertilization and provides protection to the developing embryo. In the present study, scanning electron microscopy was used to elucidate the structural details of isolated egg-envelopes from the Indian freshwater murrel, Channa punctatus. Several pores and single micropyle were observed on outer surface, whereas inner layer indicated deposition of proteinaceous material. The constituent proteins of egg-envelope were further characterized by Fourier transform infrared (FT-IR) spectroscopy, and electrophoresis and mass-spectrometry (MALDI-TOF-MS/MS). The secondary structure of egg-envelope proteins showed the presence of antiparallel ß-pleated sheets and aromatic amino acids. These proteins resolved into two peptides (130 kDa and 68 kDa) under denaturing conditions, which exhibited glycoprotein nature. The peptide band with low molecular mass showed significant similarity with transmembrane protein, whereas peptide band with high molecular mass matched with choriogenin protein of other fishes. These results confirm that chorion is derived from precursor protein, Choriogenin, in murrel. Chemical composition of egg-envelope supports that chorion is responsible exchange material and chemical defence during embryogenesis.
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Affiliation(s)
- Pooja Vijay
- Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Neeta Sehgal
- Department of Zoology, University of Delhi, Delhi, 110007, India.
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Neves EF, Lima LD, Sguarizi-Antonio D, Andrade LHC, Lima SM, Lima-Junior SE, Antonialli-Junior WF. Intraspecific Cuticular Chemical Profile Variation in the Social Wasp Mischocyttarus consimilis (Hymenoptera, Vespidae). NEOTROPICAL ENTOMOLOGY 2019; 48:1030-1038. [PMID: 31456168 DOI: 10.1007/s13744-019-00711-7] [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: 12/03/2018] [Accepted: 08/06/2019] [Indexed: 06/10/2023]
Abstract
Chemical compounds present on the cuticle of social insects are important in communication, as they are used in recognition of nestmates and sexual partners as well as in caste distinction, varying according to several factors, such as genetic and environmental. In this context, some studies have explored the cuticular chemical profile as a tool for assessing intra- and interspecific differences in social insects, although few studies have investigated this in social wasps. This study aimed to assess the differences in cuticular chemical profiles among different geographic samples of the wasp Mischocyttarus consimilis Zikán. Our hypothesis was that environmental factors are decisive to compose the cuticular chemical profiles of colonies of these social wasps and that there are differences regarding the geographic distribution among colonies. We used Fourier Transform Infrared-Photoacoustic Spectroscopy (FTIR-PAS) to assess the chemical profiles of samples. Our results show that despite there are differences between the cuticular chemical composition of the wasps' samples from different populations, there is no significant correlation compared to the spatial distribution of the colonies nor with the environment. Thus, our hypothesis was refuted, and we can infer that in this species neither exogenous nor genetic factors stand out to differentiate the chemical signature of their colonies, but a combination of both.
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Affiliation(s)
- E F Neves
- Programa de Pós-Graduação em Entomologia e Conservação da Biodiversidade, Univ Federal da Grande Dourados, Dourados, MS, Brasil.
- Laboratório de Ecologia Comportamental, Univ Estadual de Mato Grosso do Sul, Rodovia Dourados/ Itahum, Km 12, 79804-970, Dourados, MS, Brasil.
| | - L D Lima
- Laboratório de Ecologia Comportamental, Univ Estadual de Mato Grosso do Sul, Rodovia Dourados/ Itahum, Km 12, 79804-970, Dourados, MS, Brasil
| | - D Sguarizi-Antonio
- Laboratório de Ecologia Comportamental, Univ Estadual de Mato Grosso do Sul, Rodovia Dourados/ Itahum, Km 12, 79804-970, Dourados, MS, Brasil
| | - L H C Andrade
- Programa de Pós-Graduação em Recursos Naturais, Univ Estadual de Mato Grosso do Sul, Dourados, MS, Brasil
| | - S M Lima
- Programa de Pós-Graduação em Recursos Naturais, Univ Estadual de Mato Grosso do Sul, Dourados, MS, Brasil
| | - S E Lima-Junior
- Programa de Pós-Graduação em Recursos Naturais, Univ Estadual de Mato Grosso do Sul, Dourados, MS, Brasil
| | - W F Antonialli-Junior
- Laboratório de Ecologia Comportamental, Univ Estadual de Mato Grosso do Sul, Rodovia Dourados/ Itahum, Km 12, 79804-970, Dourados, MS, Brasil
- Programa de Pós-Graduação em Recursos Naturais, Univ Estadual de Mato Grosso do Sul, Dourados, MS, Brasil
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