Publications by authors named "Yukichi Abe"
Article Synopsis
- Ascidians are hermaphroditic organisms that release both sperm and eggs at the same time, but many species can't self-fertilize due to a recognition system that differentiates between self and non-self during fertilization.
- Researchers identified a protein called HrVC70, which is crucial for this recognition process, found in higher amounts in self-sterile mature oocytes compared to self-fertile immature ones, and can be released through acid treatment.
- The study also revealed genetic diversity in HrVC70 among individuals, indicating it plays a significant role in preventing self-fertilization and promoting compatibility in gamete interactions within the ascidian species Halocynthia roretzi.
The association between Helicobacter pylori (H. pylori) infection and coronary artery disease, as well as the association between H. pylori infection and classic coronary risk factors, is controversial in patients from Western countries.
View Article and Find Full Text PDFExtracellular ubiquitination and proteasome-mediated degradation of the ascidian sperm receptor.
Proc Natl Acad Sci U S A
February 2002
Article Synopsis
- The ubiquitin-proteasome system, typically known for degrading proteins inside cells, also has an important role outside the cell during the fertilization process in the ascidian (sea squirt) Halocynthia roretzi.
- Researchers have identified a protein called HrVC70, which is part of the vitelline coat (a protective layer around the egg), as a crucial substrate for this system during fertilization.
- Experimentation shows that HrVC70 is modified by ubiquitin, indicating that the ubiquitin-proteasome system facilitates the degradation of this sperm receptor, aiding sperm in penetrating the vitelline coat.