Tag: Chromatin

RYBP and YAF2 are important components of non-canonical PRC1 complexes. Learn how they interact with RING1 proteins, regulate H2AK119ub, contribute to Polycomb-mediated gene repression, and function in chromatin organization, development, stem cells, and cancer.

CBX proteins are chromobox proteins that help canonical PRC1 recognize H3K27me3-marked chromatin. Learn how CBX2, CBX4, CBX6, CBX7, and CBX8 contribute to Polycomb recruitment, H2AK119ub, chromatin organization, development, stem-cell regulation, and gene repression.

PCGF proteins are key components of PRC1 that help determine the composition and function of different Polycomb complexes. Learn how PCGF1–PCGF6 interact with RING1 proteins to regulate H2AK119ub, chromatin, gene repression, development, stem cells, and cancer.

Canonical and non-canonical PRC1 are distinct Polycomb complexes with different subunits and recruitment mechanisms. Learn how they regulate H2AK119ub, chromatin organization, gene repression, development, stem cells, and epigenetic memory.

RING1A and RING1B are key E3 ubiquitin ligases within PRC1 that establish H2AK119ub, an important Polycomb-associated histone modification. Discover how these proteins regulate chromatin, gene repression, development, stem cells, and cellular identity.

EZH2 is the major catalytic methyltransferase component of PRC2 and plays a central role in Polycomb-mediated gene regulation. Learn how EZH2 establishes H3K27 methylation and contributes to development, stem-cell regulation, epigenetic memory, and cancer.

H2AK119ub is a major histone modification associated with PRC1-mediated Polycomb repression. Established primarily by RING1A and RING1B, it contributes to chromatin organization, transcriptional repression, development, stem-cell regulation, and cellular identity.

H3K27me3 is a major epigenetic histone modification associated with Polycomb-mediated gene repression. Established primarily by PRC2, it plays important roles in chromatin regulation, development, stem-cell biology, cellular differentiation, and disease.

PRC1 and PRC2 are major Polycomb Repressive Complexes that regulate gene expression through chromatin modification and organization. They play essential roles in development, differentiation, stem-cell biology, cellular identity, and epigenetic gene regulation.

Polycomb-group proteins are conserved chromatin-associated regulators that control gene expression through epigenetic mechanisms. They function primarily through Polycomb Repressive Complexes such as PRC1 and PRC2 and play important roles in development, cellular differentiation, stem-cell biology, chromatin organization, and cancer.

RCC1 repeats form a distinctive beta-propeller structure in the RCC1 protein. This domain helps regulate Ran, a small GTP-binding protein involved in nuclear transport, chromosome organization, and cell division.

Histone modifications regulate chromatin structure and gene expression and may contribute to epigenetic effects across generations. Learn about histone acetylation, methylation, germ-cell epigenetics, reprogramming, environmental influences, genomic imprinting, and the challenges of demonstrating true transgenerational inheritance.

Histone modifications are epigenetic changes that regulate chromatin structure and gene expression. Learn about histone acetylation, methylation, phosphorylation, ubiquitination, their mechanisms, disease associations, and therapeutic significance.

Constitutive and facultative heterochromatin are two forms of condensed chromatin with distinct properties and functions. Compare their stability, gene activity, genomic locations, epigenetic marks, and roles in chromosome organization and gene regulation.

Heterochromatin is a relatively compact form of chromatin associated with reduced DNA accessibility and transcriptional activity. Learn about constitutive and facultative heterochromatin, histone modifications, DNA methylation, chromosome organization, gene regulation, and genome stability.