Identification of novel yolk ferritins unique to planarians: planarians supply aluminum rather than iron to vitellaria in egg capsules
| Autor: | Nobuyuki Azuma, Wataru Inoue, Hisashi Iwaya, Hiromoto Inoue, Ikuma Saito, Seiya Kudo, Kazuya Kobayashi, Yoshiya Asano, Kiyono Sekii, Osamu Kawase, Hinaki Nakadate, Kimitoshi Sakamoto, Motoki Sasahira, Xuenan Xuan, Hikaru Okamoto, Madoka Ichikawa-Seki, Miyu Narita, Daisuke Kondoh |
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| Rok vydání: | 2020 |
| Předmět: |
Histology
food.ingredient Iron Pathology and Forensic Medicine food Peptide mass fingerprinting Yolk Animals Amino Acid Sequence Tricladida Neoophora Gene Ovum biology Chemistry Embryogenesis Egg Proteins Cell Biology Helminth Proteins Planarians biology.organism_classification Ferritin Biochemistry Planarian embryonic structures Ferritins biology.protein Aluminum |
| Zdroj: | Cell and tissue research. 386(2) |
| ISSN: | 1432-0878 |
| Popis: | All animals, other than Platyhelminthes, produce eggs containing yolk, referred to as "entolecithal" eggs. However, only Neoophora, in the phylum Platyhelminthes, produce "ectolecithal" eggs (egg capsules), in which yolk is stored in the vitelline cells surrounding oocytes. Vitelline cells are derived from vitellaria (yolk glands). Vitellaria are important reproductive organs that may be studied to elucidate unique mechanisms that have been evolutionarily conserved within Platyhelminthes. Currently, only limited molecular level information is available on vitellaria. The current study identified major vitellaria-specific proteins in a freshwater planarian, Dugesia ryukyuensis, using peptide mass fingerprinting (PMF) and expression analyses. Amino acid sequence analysis and orthology analysis via OrthoFinder ver.2.3.8 indicated that the identified major vitellaria-specific novel yolk ferritins were conserved in planarians (Tricladida). Because ferritins play an important role in Fe (iron) storage, we examined the metal elements contained in vitellaria and ectolecithal eggs, using non-heme iron histochemistry, elemental analysis based on inductively coupled plasma mass spectrometry and transmission electron microscopy- energy-dispersive X-ray spectroscopy analysis. Interestingly, vitellaria and egg capsules contained large amounts of aluminum (Al), but not Fe. The knockdown of the yolk ferritin genes caused a decrease in the volume of egg capsules, abnormality in juveniles, and increase in Al content in vitellaria. Yolk ferritins of D. ryukyuensis may regulate Al concentration in vitellaria via their pooling function of Al and protect the egg capsule production and normal embryogenesis from Al toxicity. |
| Databáze: | OpenAIRE |
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