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Identification of a Homeostatic Stem Cell Population in the Intestinal Upper Crypt
Identification of a Homeostatic Stem Cell Population in the Intestinal Upper Crypt
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152005
- ISBN
- 9798383046906
- DDC
- 574
- 서명/저자
- Identification of a Homeostatic Stem Cell Population in the Intestinal Upper Crypt
- 발행사항
- [Sl] : Columbia University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 180 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
- 주기사항
- Includes supplementary digital materials.
- 주기사항
- Advisor: Yan, Kelley.
- 학위논문주기
- Thesis (Ph.D.)--Columbia University, 2024.
- 초록/해제
- 요약In the prevailing model, R-spondin (Rspo)-dependent Lgr5+ crypt base columnar (CBC) cells are the only dedicated intestinal stem cells (ISCs) that sustain epithelial regeneration during homeostasis by upward migration of their progeny through an elusive transit-amplifying (TA) intermediate in the upper crypt. Paradoxically, the intestinal epithelium is resilient to Lgr5+ CBC cell loss. Elicited by intriguing R-spondin (Rspo) gain- and loss-of-function phenotypes that suggest regeneration emerges from a subset of Lgr5- cells, here we combine single-cell RNA-sequencing (scRNA-seq) with time-resolved fate mapping to identify a proliferative population of multi-potent upper crypt cells in the putative location of TA cells. Distinct from the Lgr5+ CBC cells and marked by expression of Fgfbp1 - a gene which we demonstrate is essential for regeneration - these cells generate progeny that migrate bi-directionally along the crypt-villus axis and, unexpectedly, also serve as a source for the Lgr5+ cells at the base. Fgfbp1+ cells are resilient to Rspo signaling blockade and sustain epithelial homeostasis in the context of Lgr5+ cell loss, suggesting functional independence. Consistent with their stem rather than TA cell function, our results point to the existence of a novel cellular hierarchy in the intestinal epithelium, contesting the regenerative capabilities of the Lgr5+ CBC cell and helping reconcile many of the Lgr5+ CBC model inconsistencies.
- 일반주제명
- Cellular biology
- 일반주제명
- Developmental biology
- 일반주제명
- Medicine
- 키워드
- Regeneration
- 기타저자
- Columbia University Genetics and Development
- 기본자료저록
- Dissertations Abstracts International. 85-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008250123s2024 us c eng d■001000017162377
■00520250211152005
■006m o d
■007cr#unu||||||||
■020 ▼a9798383046906
■035 ▼a(MiAaPQ)AAI31330436
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a574
■1001 ▼aCapdevila Castillo, Claudia.
■24510▼aIdentification of a Homeostatic Stem Cell Population in the Intestinal Upper Crypt
■260 ▼a[Sl]▼bColumbia University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a180 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-12, Section: B.
■500 ▼aIncludes supplementary digital materials.
■500 ▼aAdvisor: Yan, Kelley.
■5021 ▼aThesis (Ph.D.)--Columbia University, 2024.
■520 ▼aIn the prevailing model, R-spondin (Rspo)-dependent Lgr5+ crypt base columnar (CBC) cells are the only dedicated intestinal stem cells (ISCs) that sustain epithelial regeneration during homeostasis by upward migration of their progeny through an elusive transit-amplifying (TA) intermediate in the upper crypt. Paradoxically, the intestinal epithelium is resilient to Lgr5+ CBC cell loss. Elicited by intriguing R-spondin (Rspo) gain- and loss-of-function phenotypes that suggest regeneration emerges from a subset of Lgr5- cells, here we combine single-cell RNA-sequencing (scRNA-seq) with time-resolved fate mapping to identify a proliferative population of multi-potent upper crypt cells in the putative location of TA cells. Distinct from the Lgr5+ CBC cells and marked by expression of Fgfbp1 - a gene which we demonstrate is essential for regeneration - these cells generate progeny that migrate bi-directionally along the crypt-villus axis and, unexpectedly, also serve as a source for the Lgr5+ cells at the base. Fgfbp1+ cells are resilient to Rspo signaling blockade and sustain epithelial homeostasis in the context of Lgr5+ cell loss, suggesting functional independence. Consistent with their stem rather than TA cell function, our results point to the existence of a novel cellular hierarchy in the intestinal epithelium, contesting the regenerative capabilities of the Lgr5+ CBC cell and helping reconcile many of the Lgr5+ CBC model inconsistencies.
■590 ▼aSchool code: 0054.
■650 4▼aCellular biology
■650 4▼aDevelopmental biology
■650 4▼aMedicine
■653 ▼aIntestinal stem cell
■653 ▼aRegeneration
■653 ▼aTransit amplifying
■653 ▼aCrypt base columnar
■653 ▼aIntestinal epithelium
■690 ▼a0379
■690 ▼a0758
■690 ▼a0564
■71020▼aColumbia University▼bGenetics and Development.
■7730 ▼tDissertations Abstracts International▼g85-12B.
■790 ▼a0054
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162377▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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