Degree Type
Honors Capstone Project
Date of Submission
Spring 5-1-2011
Capstone Advisor
Dr. Melissa Pepling
Honors Reader
Dr. Craig Albertson
Capstone Major
Biology
Capstone College
Arts and Science
Audio/Visual Component
no
Capstone Prize Winner
no
Won Capstone Funding
yes
Honors Categories
Sciences and Engineering
Subject Categories
Biochemistry | Biochemistry, Biophysics, and Structural Biology | Chemistry
Abstract
In developing pre-natal mice, germline cysts are clusters or packages of cells consisting of individual oocytes. They are formed after the primordial germ cells move to the ovary during embryogenesis. The primordial germ cells divide, but do not completely separate. The cells within the cysts are linked by intercellular bridges, which end up breaking down leading to the formation of primordial follicles. The primordial follicles are oocytes surrounded by somatic cells called granulosa cells. Only one third of the original oocytes survive cyst breakdown and become the eggs that will be used by the mouse for her reproduction. This developmental process is conserved in many organisms including Drosophila and humans. Infertility is a disorder that affects 330 million women in the United States alone. This striking statistic has led to much research on oocyte development. The developmental of cysts and cyst breakdown are vital to reproductive success as infertility arises when this process is hindered. Many factors can inhibit cyst breakdown, such as fetal exposure to estrogenic compounds found in the environment. By studying model organisms we hope to elucidate the mechanisms of cyst formation and regulation and bring this knowledge to the human scale. Cyst formation has already been well studied in fruit flies and in mice. My research will focus on oocyte development specifically cyst formation in zebrafish and how it compares to that of mice and fruit flies. Germline cysts have not been well studied in zebrafish so this research is relatively uncharted territory. To date there is some evidence to suggest the existence of germline cysts in other teleosts (bony fishes) such as the Medaka. By using the knowledge of what is known about cyst formation in Drosophila and mice, as well as literature on oogenesis in a wide range of organisms, I have conducted research to identify germline cysts in zebrafish. Zebrafish were sacrificed at different ages: from two weeks to adult, and their ovaries were stained with oocyte specific antibodies as well as antibodies that have been shown to mark intercellular bridges in Drosophila and mice. The ovary tissues were then imaged using confocal microscopy. My findings show preliminary data that supports the existence of germline cysts in zebrafish.
Recommended Citation
Cherlin, Tess, "Germline Cyst Formation and Development in Zebrafish" (2011). Renée Crown University Honors Thesis Projects - All. 251.
https://surface.syr.edu/honors_capstone/251
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