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STEINER THESIS FINAL.pdf (3.74 MB)

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Characterization of sterility and germline defects caused by Smed-boule RNA-interference

Steiner, Jessica Kathryne
http://rave.ohiolink.edu/etdc/view?acc_num=wright1463490878

Abstract Details

2016, Master of Science (MS), Wright State University, Biological Sciences.
Evolutionarily conserved molecular processes involved in construction of the germline and embryonic development are essential for the procreation of many species. Infertility affects 15% of couples in the world and can be caused by dysfunctions during egg and sperm development, anatomic defects, as well as faulty embryonic development. Although there are some infertility disorders that are genetically defined, such as Turner and Klinefelter syndromes, many clinical infertility cases are diagnosed as idiopathic due to the lack of understanding of basic fertility mechanisms. Schmidtea mediterranea is a freshwater planarian species that has the ability to regenerate complete organisms, including germ cells and reproductive structures, from small tissue fragments containing pluripotent somatic stem cells. The developmental plasticity of planarians provides a wonderful opportunity to investigate the molecular mechanisms behind the differentiation and development of specialized cells, including gametes. Smed-boule encodes for an RNA-binding protein and is the most ancestral member of the Deleted in AZoospermia (DAZ) gene family. DAZ family genes function in different aspects of germ cell development and fertility in species ranging from sea anemone to humans. Whole-mount in situ hybridization experiments revealed Smed-boule expression is enriched in the testes and ovaries of planarian flatworms. Interestingly, Smed-boule RNA-interference (RNAi) planarians lost the ability to produce gametes, yet still were able to deposit sterile egg capsules. Virgin Smed-boule(RNAi) and control planarians maintained in isolation also continuously produced sterile egg capsules. Altogether these results demonstrate that egg capsule production in S. mediterranea occurs independently of ovulation, fertilization, and mating events. In addition, detailed analysis of gametogenesis defects revealed that Smed-boule functions at different stages during male and female germline development. These findings provide novel information about the evolution of boule and DAZ-family gene expression and function in sexual reproduction.
Labib Rouhana, Ph.D. (Advisor)
David Goldstein, Ph.D. (Committee Chair)
Scott Baird, Ph.D. (Committee Member)
Mill Miller, Ph.D. (Committee Member)
130 p.
Biology; Developmental Biology
planarians, RNA interference, RNAi, boule, DAZ, ovaries, oocytes, testes, sperm, flatworms, stem cells, platyhelminthes, deuterostome, egg capsule

Recommended Citations

Citations

  • Steiner, J. K. (2016). Characterization of sterility and germline defects caused by Smed-boule RNA-interference [Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1463490878

    APA Style (7th edition)

  • Steiner, Jessica. Characterization of sterility and germline defects caused by Smed-boule RNA-interference . 2016. Wright State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1463490878.

    MLA Style (8th edition)

  • Steiner, Jessica. "Characterization of sterility and germline defects caused by Smed-boule RNA-interference ." Master's thesis, Wright State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright1463490878

    Chicago Manual of Style (17th edition)

wright1463490878
377
© 2016, all rights reserved.
This open access ETD is published by Wright State University and OhioLINK.