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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Benign Ovarian Tumors in Pregnancy: A Case Report of Metachronous Ipsilateral Recurrent Mucinous Cystadenoma in Initial Pregnancy and Mature Cystic Teratoma in Subsequent Pregnancy

Schreck, Arielle M., Mikdachi, Hana F. 03 January 2019 (has links)
Mucinous cystadenomas of the ovary are benign epithelial neoplasms that can grow rapidly during pregnancy. They may cause ovarian torsion, virilization, inferior vena cava syndrome, and even preterm labor and fetal growth restriction. Various theories exist regarding the pathogenesis of these tumors. One hypothesis suggests that they may arise from teratomas. Our case report describes synchronous mucinous cystadenomas and ovarian teratomas, as well as metachronous mucinous cystadenomas in patients with a history of ovarian teratoma. There has been no report of metachronous ipsilateral teratoma after previous mucinous cystadenoma. We present a 22-year-old female with a history of bilateral ovarian tumors in a prior pregnancy noted to have a recurrent ovarian mass on her left ovary at the time of cesarean section of a subsequent pregnancy. She had two prior cystectomies for metachronous mucinous cystadenomas of her left ovary, and a right salpingo-oophorectomy for the ovarian torsion in her previous pregnancy. On her current pregnancy, she developed a mature cystic teratoma of the remaining left ovary. The rapid growth and recurrence rate of these tumors highlights the importance of close surveillance of ovarian masses during pregnancy, even those that seem benign. In this case, a history of unilateral salpingo-oophorectomy with multiple contralateral cystectomies did not appear to affect her fertility. Her future ovarian reserve is unknown, pointing to the need for adequate pre-operative counseling in similar cases of ovarian masses in pregnancy.
2

A Novel Approach to Identify Candidate Imprinted Genes in Humans

Shapiro, Jonathan 21 March 2012 (has links)
Many imprinted genes are necessary for normal human development. Approximately 70 imprinted genes have been identified in humans. I developed a novel approach to identify candidate imprinted genes in humans using the premise that imprinted genes are often associated with nearby parent-of-origin-specific DNA differentially methylated regions (DMRs). I identified parent-of-origin-specific DMRs using sodium bisulfite-based DNA (CpG) methylation profiling of uniparental tissues, mature cystic ovarian teratoma (MCT) and androgenetic complete hydatidiform mole (AnCHM), and biparental tissues, blood and placenta. In support of this approach, the CpG methylation profiling led to the identification of parent-of-origin-specific differentially methylated CpG sites (DMCpGs) in known parent-of-origin-specific DMRs. I found new DMRs for known imprinted genes NAP1L5 and ZNF597. Most importantly, I discovered many new DMCpGs, which were associated with nearby genes, i.e., candidate imprinted genes. Allelic expression analyses of one candidate imprinted gene, AXL, suggested polymorphic imprinting of AXL in human blood.
3

A Novel Approach to Identify Candidate Imprinted Genes in Humans

Shapiro, Jonathan 21 March 2012 (has links)
Many imprinted genes are necessary for normal human development. Approximately 70 imprinted genes have been identified in humans. I developed a novel approach to identify candidate imprinted genes in humans using the premise that imprinted genes are often associated with nearby parent-of-origin-specific DNA differentially methylated regions (DMRs). I identified parent-of-origin-specific DMRs using sodium bisulfite-based DNA (CpG) methylation profiling of uniparental tissues, mature cystic ovarian teratoma (MCT) and androgenetic complete hydatidiform mole (AnCHM), and biparental tissues, blood and placenta. In support of this approach, the CpG methylation profiling led to the identification of parent-of-origin-specific differentially methylated CpG sites (DMCpGs) in known parent-of-origin-specific DMRs. I found new DMRs for known imprinted genes NAP1L5 and ZNF597. Most importantly, I discovered many new DMCpGs, which were associated with nearby genes, i.e., candidate imprinted genes. Allelic expression analyses of one candidate imprinted gene, AXL, suggested polymorphic imprinting of AXL in human blood.

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