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Perivitelline fluid

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The perivitelline fluid is an extracellular fluid found in the eggs of most gastropods and constitutes the main source of nutrition and defense for their embryos. It replaces the egg yolk of other animals, which in snail eggs is reduced to non-nutritive proteinaceous granules with putative enzymatic function. [1]

During embryonic development the perivitelline fluid is ingested macropinocytotically by the embryos and the resulting phagosomes fuse with β-granules containing hydrolytic enzymes, which digest the perivitelline fluid components.[1][2][3][4][5]

Origin

The perivitelline fluid is synthesized by the albumen gland of female snails (also known as albumen gland-capsule gland complex or uterine gland), an accessory gland from the reproductive tract. Fertilized oocytes enter the albumen gland and, on their way out, are coated with the perivitielline fluid. [1][6][7] The amount of perivitelline fluid per egg vary considerably among species. [1] However, the amount of perivitelline fluid per egg is constant within a given species. [8] In this regard, it has been shown in Pomacea apple snails that during the reproductive season, when the nutrient precursors decrease in the albumen gland due to successive ovipositions, females tend to reduce the number of eggs per clutch but not the amount allocated to each egg. [9]

Composition

The perivitelline fluid contains predominantly galactogen, proteins, and calcium.[8][10][11][12]

Carbohydrate is invariably the most abundant component of the perivitelline fluid. Specifically, the eggs of most gastropod accumulate the polysaccharide galactogen, [8][10][11][12][13] which would provide the main energy source for the developing embryo. A small amount of soluble glucose was also detected in some species. [11][12]

Proteins, called perivitellins, are the second most abundant component of the perivitelline fluid. Perivitellins are also a source of nutrients for snail embryos [11][14] and play a role in protection against pathogens [12][14][15][16] and predators, and include non-digestible perivitellins, toxins and protease inhibitors. [12][17][18][19][20][21][22][23][24][25] These proteins were thoroughly studied in apple snails from the genus Pomacea, where they were originally grouped in two most abundant protein fractions perivitellin-1 or PV1, perivitellin-2 or PV2 (comprising approximately 70% of total protein), and a heterogeneous fraction dubbed perivitellin-3 or PV3 fraction.[26][27] Recent proteomic analyses, however, showed that the perivitelline fluid from Pomacea snails has between 34-38 different proteins with a wide variety of functions.[28][29][30]

Lipids are a minor component, mostly represented by membrane lipids, indicating that snails do not use lipids as a major energy reserve during reproduction. [11][12] Apart from structural lipids, some eggs also contain carotenoid pigments, notably astaxanthin. [12][17][27] These lipidic pigments have been associated with antioxidant and photoprotective functions, [27][31][32] and also provide Pomacea eggs with the typical bright color that would function as a warning signal (i.e. aposematism) to deter predators.[27][33][34][35]

Among the inorganic components, calcium ion is the most abundant in the perivitelline fluid. As these snails have direct development, calcium needs to be stored to allow the snail to develop the shell during organogenesis. Besides, calcium is the main component of the eggshell of those snails with aerial oviposition.[36]

References

  1. ^ a b c d De Jong-Brink M, Boer HH, Joose J (1983). "Mollusca". In Adiyodi KG, Adiyodi RG (eds.). Reproductive Biology of Invertebrates. Vol. I: Oogenesis, oviposition and oosorption. John Wiley and Sons. pp. 297–355.
  2. ^ Bluemink JG (1967). The subcellular structure of the blastula of Limnaea stagnalis L. (Mollusca) and the metabolization of the nutrient reserve (Ph.D. thesis). Utrecht.
  3. ^ Favard P, Carasso N (1958). "Origine et ultrastructure des plaquettes vitelline de la planorbe". Arch. Anat. Mier. Morph. Exptl. 47: 211–229.
  4. ^ Bottke W (1977). Ferritin-Dotter bei der Schnecke Planorbarius corneus L. Verh. Dtsch. Zool. Ges.. Stuttgart: Gustav Fischer Verlag. p. 301.
  5. ^ Koch E, Winik BC, Castro-Vazquez A (April 2009). "Development beyond the gastrula stage and digestive organogenesis in the apple-snail Pomacea canaliculata (Architaenioglossa, Ampullariidae)". Biocell. 33 (1): 49–65. doi:10.32604/biocell.2009.33.049. PMID 19499886.
  6. ^ Hayes KA, Cowie RH, Thiengo SC, Strong EE (2012). "Comparing apples with apples: clarifying the identities of two highly invasive Neotropical Ampullariidae (Caenogastropoda)". Zoological Journal of the Linnean Society. 166 (4): 723–753. doi:10.1111/j.1096-3642.2012.00867.x. ISSN 1096-3642.
  7. ^ Catalán M, Dreon MS, Heras H, Pollero RJ, Fernández SN, Winik B (June 2006). "Pallial oviduct of Pomacea canaliculata (Gastropoda): ultrastructural studies of the parenchymal cellular types involved in the metabolism of perivitellins". Cell and Tissue Research. 324 (3): 523–33. doi:10.1007/s00441-005-0132-x. PMID 16453107. S2CID 30906846.
  8. ^ a b c Horstmann HG (1956). "Der galaktogengehalt der Eier von Lymnaea stagnalis während der embryonalentwicklung". Biochem. Z. 328: 342–347.
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  21. ^ Ituarte S, Brola TR, Fernández PE, Mu H, Qiu JW, Heras H, Dreon MS (2018-06-01). "A lectin of a non-invasive apple snail as an egg defense against predation alters the rat gut morphophysiology". PLOS ONE. 13 (6): e0198361. Bibcode:2018PLoSO..1398361I. doi:10.1371/journal.pone.0198361. PMC 5983499. PMID 29856808.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  22. ^ tuarte S, Brola TR, Dreon MS, Sun J, Qiu JW, Heras H (2019-02-01). "Non-digestible proteins and protease inhibitors: implications for defense of the colored eggs of the freshwater apple snail Pomacea canaliculata". Canadian Journal of Zoology. 97 (6): 558–566. doi:10.1139/cjz-2018-0210. hdl:1807/95364.
  23. ^ Pasquevich MY, Dreon MS, Qiu JW, Mu H, Heras H (November 2017). "Convergent evolution of plant and animal embryo defences by hyperstable non-digestible storage proteins". Scientific Reports. 7 (1): 15848. Bibcode:2017NatSR...715848P. doi:10.1038/s41598-017-16185-9. PMC 5696525. PMID 29158565. S2CID 8393065.
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  32. ^ Dreon MS, Ceolín M, Heras H (April 2007). "Astaxanthin binding and structural stability of the apple snail carotenoprotein ovorubin". Archives of Biochemistry and Biophysics. 460 (1): 107–12. doi:10.1016/j.abb.2006.12.033. PMID 17324373.
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  34. ^ Ituarte S, Dreon MS, Ceolín M, Heras H (September 2008). "Isolation and characterization of a novel perivitellin from the eggs of Pomacea scalaris (Mollusca, Ampullariidae)". Molecular Reproduction and Development. 75 (9): 1441–8. doi:10.1002/mrd.20880. PMID 18213678. S2CID 24352602.
  35. ^ Dreon MS, Schinella G, Heras H, Pollero RJ (February 2004). "Antioxidant defense system in the apple snail eggs, the role of ovorubin". Archives of Biochemistry and Biophysics. 422 (1): 1–8. doi:10.1016/j.abb.2003.11.018. PMID 14725852.
  36. ^ Tompa AS (1980). "Studies on the reproductive biology of gastropods: Part III. Calcium provision and the evolution of terrestrial eggs among gastropods". Journal of Conchology. 30: 145–154.
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