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Histone Regulation of the Maternal to Zygotic Transition: The Role of Histone Modifications on Zygotic Genome Activation
Histone Regulation of the Maternal to Zygotic Transition: The Role of Histone Modifications on Zygotic Genome Activation
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151033
- ISBN
- 9798383351598
- DDC
- 575
- 서명/저자
- Histone Regulation of the Maternal to Zygotic Transition: The Role of Histone Modifications on Zygotic Genome Activation
- 발행사항
- [Sl] : Yale University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 88 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-01, Section: B.
- 주기사항
- Advisor: Giraldez, Antonio J.
- 학위논문주기
- Thesis (Ph.D.)--Yale University, 2024.
- 초록/해제
- 요약Following fertilization, the zebrafish embryo experiences significant reprogramming events to erase the inherited program of the terminally differentiated gametes, paving the way for the establishment of the zygotic program, which will drive the early steps of embryonic development. An essential step within this process is zygotic genome activation (ZGA), which refers to the time of development when the zygotic genome goes from being largely transcriptionally inactive to a gradual onset of transcriptional activity. In zebrafish, this process coincides with the deposition of many histone modifications associated with the positive regulation of transcription. Here, to explore the function of these transcription-associated marks during ZGA, I use a series of small-molecule inhibitors to screen against histone-modifying enzymes that cause gastrulation defects, as this tends to indicate defects in zygotic genome activation. I find that inhibitors against the acetyltransferases KAT2A and KAT8 tend to block gastrulation. Meanwhile, those against the H3K4 histone methyltransferase, KMT2, allow for the development of the embryo past gastrulation and do not prevent transcriptional appear to prevent transcriptional onset. While transcription is not globally downregulated, some transcripts are preferentially affected by the removal of the mark. Interestingly, inhibiting the eraser of H3K4me3, KDM5 blocks development at gastrulation. Given that this and other studies suggest that the activity of several epigenetic modifiers is essential for the correct regulation of Zygotic genome activation, I use the overexpression of lysine(K) to arginine(R) mutant histones in a histone-deficient background to interrogate the role of the histone modifications independent of any other enzymatic activity of the epigenetic modifier. In particular, to study the role of H3K27 in the onset of ZGA. Preventing the modification of the H3 tail blocks gastrulation and downregulated transcription in embryos injected with the mutant version of the histone. Interestingly, in mutants where only one lysine is replaced at a time, only K27R mutants mimic the developmental phenotype and the downregulation of transcription. All of these suggest a role for H3 lysine tail modifications in regulating ZGA and a critical role for K27.
- 일반주제명
- Genetics
- 일반주제명
- Cellular biology
- 일반주제명
- Biology
- 일반주제명
- Molecular biology
- 키워드
- Gastrulation
- 기타저자
- Yale University Genetics
- 기본자료저록
- Dissertations Abstracts International. 86-01B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211151033
■006m o d
■007cr#unu||||||||
■020 ▼a9798383351598
■035 ▼a(MiAaPQ)AAI30997417
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a575
■1001 ▼aBenitez, Maria De Jesus.
■24510▼aHistone Regulation of the Maternal to Zygotic Transition: The Role of Histone Modifications on Zygotic Genome Activation
■260 ▼a[Sl]▼bYale University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a88 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-01, Section: B.
■500 ▼aAdvisor: Giraldez, Antonio J.
■5021 ▼aThesis (Ph.D.)--Yale University, 2024.
■520 ▼aFollowing fertilization, the zebrafish embryo experiences significant reprogramming events to erase the inherited program of the terminally differentiated gametes, paving the way for the establishment of the zygotic program, which will drive the early steps of embryonic development. An essential step within this process is zygotic genome activation (ZGA), which refers to the time of development when the zygotic genome goes from being largely transcriptionally inactive to a gradual onset of transcriptional activity. In zebrafish, this process coincides with the deposition of many histone modifications associated with the positive regulation of transcription. Here, to explore the function of these transcription-associated marks during ZGA, I use a series of small-molecule inhibitors to screen against histone-modifying enzymes that cause gastrulation defects, as this tends to indicate defects in zygotic genome activation. I find that inhibitors against the acetyltransferases KAT2A and KAT8 tend to block gastrulation. Meanwhile, those against the H3K4 histone methyltransferase, KMT2, allow for the development of the embryo past gastrulation and do not prevent transcriptional appear to prevent transcriptional onset. While transcription is not globally downregulated, some transcripts are preferentially affected by the removal of the mark. Interestingly, inhibiting the eraser of H3K4me3, KDM5 blocks development at gastrulation. Given that this and other studies suggest that the activity of several epigenetic modifiers is essential for the correct regulation of Zygotic genome activation, I use the overexpression of lysine(K) to arginine(R) mutant histones in a histone-deficient background to interrogate the role of the histone modifications independent of any other enzymatic activity of the epigenetic modifier. In particular, to study the role of H3K27 in the onset of ZGA. Preventing the modification of the H3 tail blocks gastrulation and downregulated transcription in embryos injected with the mutant version of the histone. Interestingly, in mutants where only one lysine is replaced at a time, only K27R mutants mimic the developmental phenotype and the downregulation of transcription. All of these suggest a role for H3 lysine tail modifications in regulating ZGA and a critical role for K27.
■590 ▼aSchool code: 0265.
■650 4▼aGenetics
■650 4▼aCellular biology
■650 4▼aBiology
■650 4▼aMolecular biology
■653 ▼aZygotic genome activation
■653 ▼aHistone modifications
■653 ▼aEmbryonic development
■653 ▼aGastrulation
■690 ▼a0369
■690 ▼a0379
■690 ▼a0306
■690 ▼a0307
■71020▼aYale University▼bGenetics.
■7730 ▼tDissertations Abstracts International▼g86-01B.
■790 ▼a0265
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160516▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


