Oocyte growth in temperate basses: multiple forms of vitellogenin and their receptor |
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Authors: | N. Hiramatsu A. Hara T. Matsubara K. Hiramatsu C.V. Sullivan |
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Affiliation: | 1. Dept. Zool., North Carolina State Univ., Raleigh, USA 2. Div. Marine Biosci., Grad. School Fish. Sci., Hokkaido Univ., Hakodate, Japan 3. Hokkaido Natl. Fish. Res. Inst., Kushiro, Japan
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Abstract: | A full-length cDNA encoding a vitellogenin (Vg) receptor (VgR) was isolated and sequenced from a white perch, Morone americana, ovarian cDNA library. The perch expresses a single VgR that is structurally classified as an LR8 type (without an 0-linked sugar domain) and appears to be the only species observed to possess no splice variant of the receptor. We proposed a hypothetical model for ovarian lipid transfer in Morone species, one in which the `single VgR' transports Vg and other lipoproteins via a selective endocytotic pathway based on ligand affinity, in conjunction with a lipase-mediated pathway of fatty acid transport. |
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