ArticleThe Journal of biological chemistry2023
Egg envelope formation of medaka Oryzias latipes requires ZP proteins originating from both the liver and ovary.
Article in The Journal of biological chemistry, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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7 citing papers in PubMed, 13 citations in OpenAlex.
- Cytochrome P450 1a (CYP1A)-Knockout Javanese Medaka Fish Exhibit Diabetic Traits and Reduced Reproductive Capacity.FASEB journal : official publication of the Federation of American Societies for Experimental Biology · 2026Article
- Evaluation of season and sex specific differential gonadal transcriptomics in Himalayan snow trout Schizothorax plagiostomus, Heckel, 1838.Scientific reports · 2026Article
- Transcriptional Profiling of Common Carp: A Microarray-Based Framework for Aquaculture Research.International journal of molecular sciences · 2025Article
- Convergent Evolutionary Dead-End and Breakdown of Hard Chorion in Parental-Egg-Care Fish Reproductive Strategies.Molecular ecology · 2025Article
- Cloning-Free Targeting of Endogenous Loci to Generate Fluorescent Reporters in Medaka.Bio-protocol · 2025Article
- Genome-Wide Identification and Expression Analysis of Zona Pellucida (ZP) Gene Family inInternational journal of molecular sciences · 2025Article
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6 authors at 3 institutions in 1 country.
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No grant is acknowledged in the PubMed record.
Abstract
Teleost oocytes are surrounded by a structure called chorion or egg envelopes, which is composed of zona pellucida (ZP) proteins. As a result of the gene duplication in teleost, the expression site of the zp genes, coding the major component protein of egg envelopes, changed from the ovary to the maternal liver. In Euteleostei, there are three liver-expressed zp genes, named choriogenin (chg) h, chg hm, and chg l, and the composition of the egg envelope is mostly made up of these Chgs. In addition, ovary-expressed zp genes are also conserved in the medaka genomes, and their proteins have also been found to be minor components of the egg envelopes. However, the specific role of liver-expressed versus ovary-expressed zp genes was unclear. In the present study, we showed that ovary-synthesized ZP proteins first form the base layer of the egg envelope and then Chgs polymerize inwardly to thicken the egg envelope. To analyze the effects of dysfunction of the chg gene, we generated some chg knockout medaka. All knockout females failed to produce normally fertilized eggs by the natural spawning. The egg envelopes lacking Chgs were significantly thinner, but layers formed by ZP proteins synthesized in the ovary were found in the thin egg envelope of knockout as well as wildtype eggs. These results suggest that the ovary-expressed zp gene is well conserved in all teleosts, including those species in which liver-derived ZP proteins are the major component, because it is essential for the initiation of egg envelope formation.
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