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- W2087220039 abstract "Ascidians release sperm and eggs simultaneously, but self-fertilization is effectively blocked by unknown mechanisms. We previously reported that a 70-kDa sperm receptor HrVC70 on the egg vitelline coat (VC) consisting of 12 EGF-like repeats is a candidate self/nonself recognition molecule during fertilization of the ascidian, Halocynthia roretzi. Here, we report that Halocynthia aurantium also utilizes a homolog (HaVC80) of HrVC70 as an allorecognizable sperm receptor. HaVC80 is attached to the VC during the acquisition of self-sterility and is detached from the VC by acid treatment, allowing self-fertilization. A cDNA clone of the HaVC80 precursor, HaVC130, consists of 3726 nucleotides and encodes an open reading frame of 1208 amino acids. The structure of HaVC130 is very similar to the HrVC70 precursor HrVC120, but the number of EGF-like repeats of HaVC130/VC80 is one repeat larger than that of HrVC120/VC70. There are several amino acid substitutions between different individuals, and two alleles of the HaVC80 sequence were detected in each individual. Genomic DNA sequence analysis reveals that each EGF-like domain corresponds to a specific exon, and HaVC130 may have been evolutionarily generated from HrVC120 by duplication of the 8th EGF-like repeat. The data support the hypothesis that HaVC80 is a highly polymorphic protein responsible for self-sterility in H. aurantium." @default.
- W2087220039 created "2016-06-24" @default.
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- W2087220039 date "2005-10-01" @default.
- W2087220039 modified "2023-10-14" @default.
- W2087220039 title "Highly polymorphic vitelline-coat protein HaVC80 from the ascidian, Halocynthia aurantium: Structural analysis and involvement in self/nonself recognition during fertilization" @default.
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- W2087220039 doi "https://doi.org/10.1016/j.ydbio.2005.08.004" @default.
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