Cfp1 Action in Cartilage Development

软骨内成骨是间充质祖细胞分化为 在形成骨骼之前的软骨。它们的区分能力的扰动会导致骨骼异常。 因此，破译控制这些细胞的分子机制对于理解 我们正在研究骨骼疾病的病因，以及开发新的治疗方法来恢复骨骼。而当 转录因子和信号分子与软骨发育有关，但对此知之甚少 启动这一过程的上游机制。来自老鼠和人类的最新数据涉及表观遗传 调节因子是MPC功能的关键调节者。CXXC Finger Protein 1(Cfp1)是一种表观遗传学 调节因子参与祖细胞功能，尽管其作用机制(S)尚未被 定义得很清楚。为了解决这个问题，我们专门从肢芽间充质中删除了Cfp1。初步数据显示 Cfp1的缺失导致出生时前肢完全缺失。随后对胚胎的分析 前肢透露，在没有Cfp1的情况下，MPC未能发生缩合，这是 软骨生成。全转录组分析显示成软骨基因标记物显著减少， 包括主要转录调控因子Sox9，它是缩合所必需的，进一步涉及Cfp1 作为软骨形成早期阶段的关键因素。初步数据表明，Cfp1可能调节 这一关键的发育步骤是通过激活BMP信号来实现的。此外，虽然变异的后肢形成了他们 严重发育迟缓，与我们的观察一致，软骨细胞中Cfp1的缺失会导致骨骼变短。 总之，这些数据表明，Cfp1也调节软骨细胞的分化和成熟 生长板发育。我们假设Cfp1调控软骨发育的多个阶段 通过调节重要的转录调节因子和关键的信号通路。Cfp1的进一步研究 将提供对细胞和分子机制的表观遗传调控如何影响的基本见解 软骨形成和生长板发育。我们建议：1)确定CFp1‘S在软骨细胞中的作用 长骨发育过程中的分化：2)Cfp1缺失对生长板发育的影响 3)明确Cfp1在软骨发育过程中的调控网络。

Endochondral ossification is a process by which mesenchymal progenitor cells (MPCs) differentiate into cartilage prior to forming bone. Perturbations in their capacity to differentiate leads to skeletal anomalies. Therefore, deciphering the molecular mechanisms controlling these cells is crucial for both understanding the causes of skeletal diseases as well as developing new therapeutic approaches to restore the skeleton. While transcription factors and signaling molecules have been linked to cartilage development, less is known about the upstream mechanisms that initiate the process. Recent data from mice and humans implicate epigenetic regulatory factors as critical modulators of MPC function. CXXC finger protein 1 (Cfp1) is an epigenetic regulatory factor implicated in progenitor cell function, though the mechanism(s) of its action have not been well defined. To address this, we deleted Cfp1 specifically from limb bud mesenchyme. Preliminary data show that loss of Cfp1 results in the complete absence of forelimbs at birth. Subsequent analysis of embryonic forelimbs revealed that, in the absence of Cfp1, MPCs failed to undergo condensation, the initial step in chondrogenesis. Whole transcriptome analysis revealed a dramatic reduction in chondrogenic gene markers, including the master transcriptional regulator, Sox9, which is required for condensation, further implicating Cfp1 as a crucial factor in the early stages of cartilage formation. Preliminary data indicate that Cfp1 may regulate this key developmental step through activation of BMP signaling. Further, while mutant hindlimbs form they are severely stunted, consistent with our observation that deletion of Cfp1 in chondrocytes results in shorter bones. Together, these data suggest that Cfp1 also regulates chondrocyte differentiation and maturation during growth plate development. We hypothesize that Cfp1 regulates multiple stages of cartilage development through modulation of essential transcriptional regulators and key signaling pathways. Further study of Cfp1 will provide fundamental insight into how epigenetic regulation of cellular and molecular mechanisms impacts chondrogenesis and growth plate development. We propose: 1) to identify Cfp1's actions during chondrocyte differentiation in the developing long bone, 2) to determine the effect of Cfp1 loss on growth plate development and 3) to identify the Cfp1 regulatory network during cartilage development.