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Structural analysis and characterization of egg-envelope in the Indian freshwater murrel, Channa punctatus

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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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Funding

The present work was supported by Research Grant from the University of Delhi, Delhi, India.

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  1. Department of Zoology, University of Delhi, Delhi, 110007, India

    Pooja Vijay & Neeta Sehgal

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  1. Pooja Vijay
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  2. Neeta Sehgal
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Correspondence to Neeta Sehgal.

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Vijay, P., Sehgal, N. Structural analysis and characterization of egg-envelope in the Indian freshwater murrel, Channa punctatus. Fish Physiol Biochem 46, 1847–1856 (2020). https://doi.org/10.1007/s10695-020-00834-4

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