Laboratory Notes https://www.laboratorynotes.com/ Wed, 30 Sep 2026 21:21:41 +0000 en hourly 1 https://wordpress.org/?v=7.1.2 MYC Oncoprotein https://www.laboratorynotes.com/myc-oncoprotein/ https://www.laboratorynotes.com/myc-oncoprotein/#respond Wed, 30 Sep 2026 21:21:41 +0000 https://www.laboratorynotes.com/?p=32484 MYC oncoproteins are powerful transcription factors that reprogram gene expression to promote cancer cell growth, proliferation, metabolism and survival. Discover how MYC, MYCN and MYCL contribute to tumor development.

The post MYC Oncoprotein appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/myc-oncoprotein/feed/ 0 RAS Oncoprotein https://www.laboratorynotes.com/ras-oncoprotein/ https://www.laboratorynotes.com/ras-oncoprotein/#respond Wed, 30 Sep 2026 20:17:32 +0000 https://www.laboratorynotes.com/?p=32482 RAS oncoproteins are powerful cancer-driving proteins that act as abnormal molecular switches. Mutations in KRAS, NRAS and HRAS can keep RAS signaling active, promoting cell proliferation, survival, metabolism, invasion and tumor progression.

The post RAS Oncoprotein appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/ras-oncoprotein/feed/ 0 How Oncogenes Are Activated: Mutation, Amplification, Overexpression and Chromosomal Rearrangement https://www.laboratorynotes.com/how-oncogenes-are-activated-mutation-amplification-overexpression-and-chromosomal-rearrangement/ https://www.laboratorynotes.com/how-oncogenes-are-activated-mutation-amplification-overexpression-and-chromosomal-rearrangement/#respond Wed, 30 Sep 2026 20:09:54 +0000 https://www.laboratorynotes.com/?p=32479 Oncogenes can arise when proto-oncogenes are activated by mutations, gene amplification, overexpression or chromosomal rearrangements. These changes can produce persistent signaling and cancer-driving oncoproteins.

The post How Oncogenes Are Activated: Mutation, Amplification, Overexpression and Chromosomal Rearrangement appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/how-oncogenes-are-activated-mutation-amplification-overexpression-and-chromosomal-rearrangement/feed/ 0 Proto-Oncogenes and Oncogenes https://www.laboratorynotes.com/proto-oncogenes-and-oncogenes/ https://www.laboratorynotes.com/proto-oncogenes-and-oncogenes/#respond Wed, 30 Sep 2026 19:55:33 +0000 https://www.laboratorynotes.com/?p=32476 Proto-oncogenes are normal genes that regulate cell growth, survival and signaling. Genetic alterations can convert them into oncogenes that produce or promote cancer-driving oncoproteins.

The post Proto-Oncogenes and Oncogenes appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/proto-oncogenes-and-oncogenes/feed/ 0 Oncoprotein https://www.laboratorynotes.com/oncoprotein/ https://www.laboratorynotes.com/oncoprotein/#respond Wed, 30 Sep 2026 19:34:28 +0000 https://www.laboratorynotes.com/?p=32473 Oncoproteins are abnormal or deregulated proteins that promote cancer development by altering cell proliferation, survival, metabolism, signaling, and other cellular processes. This overview introduces major types of oncoproteins and their roles in cancer.

The post Oncoprotein appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/oncoprotein/feed/ 0 Polycomb and the Repressive B Compartment: Mechanisms of Nuclear Gene Silencing and Genome Organization https://www.laboratorynotes.com/polycomb-and-the-repressive-b-compartment-mechanisms-of-nuclear-gene-silencing-and-genome-organization/ https://www.laboratorynotes.com/polycomb-and-the-repressive-b-compartment-mechanisms-of-nuclear-gene-silencing-and-genome-organization/#respond Wed, 30 Sep 2026 14:56:31 +0000 https://www.laboratorynotes.com/?p=32470 The repressive B compartment is a major feature of three-dimensional genome organization. Learn how Polycomb complexes, PRC1, PRC2, H3K27me3, H2AK119ub, TADs, chromatin loops, and nuclear organization contribute to gene repression and chromatin architecture.

The post Polycomb and the Repressive B Compartment: Mechanisms of Nuclear Gene Silencing and Genome Organization appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/polycomb-and-the-repressive-b-compartment-mechanisms-of-nuclear-gene-silencing-and-genome-organization/feed/ 0 Polycomb and Chromatin Compartment https://www.laboratorynotes.com/polycomb-and-chromatin-compartment/ https://www.laboratorynotes.com/polycomb-and-chromatin-compartment/#respond Wed, 30 Sep 2026 14:50:33 +0000 https://www.laboratorynotes.com/?p=32466 Chromatin compartments organize the genome into broad active and repressive environments. Explore how Polycomb complexes, PRC1, PRC2, H3K27me3, H2AK119ub, TADs, CTCF, and cohesin interact with A/B compartments to regulate gene expression and 3D genome organization.

The post Polycomb and Chromatin Compartment appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/polycomb-and-chromatin-compartment/feed/ 0 Topologically Associating Domains and Polycomb Domains: How Chromatin Domains Organize Gene Regulation https://www.laboratorynotes.com/topologically-associating-domains-and-polycomb-domains-how-chromatin-domains-organize-gene-regulation/ https://www.laboratorynotes.com/topologically-associating-domains-and-polycomb-domains-how-chromatin-domains-organize-gene-regulation/#respond Wed, 30 Sep 2026 14:45:32 +0000 https://www.laboratorynotes.com/?p=32463 TADs and Polycomb domains represent distinct but interacting layers of 3D genome organization. Explore how Polycomb chromatin, PRC1, PRC2, CTCF, cohesin, chromatin loops, and TADs contribute to gene regulation.

The post Topologically Associating Domains and Polycomb Domains: How Chromatin Domains Organize Gene Regulation appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/topologically-associating-domains-and-polycomb-domains-how-chromatin-domains-organize-gene-regulation/feed/ 0 Polycomb and Enhancer–Promoter Interactions: Balancing Gene Repression and Gene Activation https://www.laboratorynotes.com/polycomb-and-enhancer-promoter-interactions-balancing-gene-repression-and-gene-activation/ https://www.laboratorynotes.com/polycomb-and-enhancer-promoter-interactions-balancing-gene-repression-and-gene-activation/#respond Wed, 30 Sep 2026 14:39:47 +0000 https://www.laboratorynotes.com/?p=32460 Polycomb complexes regulate developmental genes through repressive chromatin states that interact with enhancer and promoter activity. Explore how PRC1, PRC2, histone modifications, chromatin architecture, and enhancer–promoter interactions coordinate gene regulation.

The post Polycomb and Enhancer–Promoter Interactions: Balancing Gene Repression and Gene Activation appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/polycomb-and-enhancer-promoter-interactions-balancing-gene-repression-and-gene-activation/feed/ 0 Polycomb Chromatin Loops and Long-Range Gene Regulation https://www.laboratorynotes.com/polycomb-chromatin-loops-and-long-range-gene-regulation/ https://www.laboratorynotes.com/polycomb-chromatin-loops-and-long-range-gene-regulation/#respond Wed, 30 Sep 2026 14:25:16 +0000 https://www.laboratorynotes.com/?p=32457 Polycomb chromatin loops and long-range interactions connect Polycomb-mediated epigenetic regulation with three-dimensional genome organization, helping coordinate the regulation of developmental and cell-identity genes.

The post Polycomb Chromatin Loops and Long-Range Gene Regulation appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/polycomb-chromatin-loops-and-long-range-gene-regulation/feed/ 0 Polycomb, CTCF, and Cohesin: Interactions in 3D Genome Organization https://www.laboratorynotes.com/polycomb-ctcf-and-cohesin-interactions-in-3d-genome-organization/ https://www.laboratorynotes.com/polycomb-ctcf-and-cohesin-interactions-in-3d-genome-organization/#respond Wed, 30 Sep 2026 14:03:54 +0000 https://www.laboratorynotes.com/?p=32455 Polycomb, CTCF, and cohesin are interconnected regulators of 3D genome organization. Explore how Polycomb chromatin, CTCF binding, cohesin-mediated looping, TADs, chromatin interactions, and developmental gene regulation intersect.

The post Polycomb, CTCF, and Cohesin: Interactions in 3D Genome Organization appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/polycomb-ctcf-and-cohesin-interactions-in-3d-genome-organization/feed/ 0 Polycomb Nuclear Bodies and Foci https://www.laboratorynotes.com/polycomb-nuclear-bodies-and-foci/ https://www.laboratorynotes.com/polycomb-nuclear-bodies-and-foci/#respond Wed, 30 Sep 2026 13:57:00 +0000 https://www.laboratorynotes.com/?p=32452 Polycomb nuclear bodies and foci are nuclear concentrations of Polycomb proteins and associated chromatin. Explore how PRC1, PRC2, H3K27me3, H2AK119ub, chromatin interactions, and 3D genome organization contribute to Polycomb nuclear organization.

The post Polycomb Nuclear Bodies and Foci appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/polycomb-nuclear-bodies-and-foci/feed/ 0 Polycomb Domain https://www.laboratorynotes.com/polycomb-domain/ https://www.laboratorynotes.com/polycomb-domain/#respond Wed, 30 Sep 2026 13:29:48 +0000 https://www.laboratorynotes.com/?p=32449 Polycomb domains are genomic regions associated with Polycomb complexes, H3K27me3, H2AK119ub, and specialized chromatin organization. Learn how these domains form, are maintained, and contribute to gene repression, development, epigenetic memory, and 3D genome organization.

The post Polycomb Domain appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/polycomb-domain/feed/ 0 Topic : Polycomb Proteins https://www.laboratorynotes.com/topic-polycomb-proteins/ https://www.laboratorynotes.com/topic-polycomb-proteins/#respond Wed, 30 Sep 2026 00:14:54 +0000 https://www.laboratorynotes.com/?p=32442 Polycomb-Group Proteins    H2AK119ub H3K27me3      Polycomb Chromatin Architecture and 3D Genome Organization Polycomb-Mediated Epigenetic Memory Polycomb Response Elements...

The post Topic : Polycomb Proteins appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/topic-polycomb-proteins/feed/ 0 Polycomb Chromatin Architecture and 3D Genome Organization https://www.laboratorynotes.com/polycomb-chromatin-architecture-and-3d-genome-organization/ https://www.laboratorynotes.com/polycomb-chromatin-architecture-and-3d-genome-organization/#respond Wed, 30 Sep 2026 00:06:53 +0000 https://www.laboratorynotes.com/?p=32439 Polycomb proteins contribute to three-dimensional genome organization through chromatin interactions, Polycomb domains, nucleosome organization, and PRC1- and PRC2-associated mechanisms. Learn how Polycomb architecture connects H3K27me3, H2AK119ub, gene repression, and nuclear organization.

The post Polycomb Chromatin Architecture and 3D Genome Organization appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/polycomb-chromatin-architecture-and-3d-genome-organization/feed/ 0 Polycomb-Mediated Epigenetic Memory https://www.laboratorynotes.com/polycomb-mediated-epigenetic-memory/ https://www.laboratorynotes.com/polycomb-mediated-epigenetic-memory/#respond Tue, 29 Sep 2026 23:55:26 +0000 https://www.laboratorynotes.com/?p=32436 Polycomb-mediated epigenetic memory allows cells to maintain patterns of gene repression through development and cell division. Learn how PRC1, PRC2, H3K27me3, H2AK119ub, and chromatin organization contribute to this dynamic regulatory process.

The post Polycomb-Mediated Epigenetic Memory appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/polycomb-mediated-epigenetic-memory/feed/ 0 Polycomb Response Elements (PREs) https://www.laboratorynotes.com/polycomb-response-elements-pres/ https://www.laboratorynotes.com/polycomb-response-elements-pres/#respond Tue, 29 Sep 2026 23:44:32 +0000 https://www.laboratorynotes.com/?p=32433 Polycomb response elements (PREs) are cis-regulatory DNA regions that help recruit and organize Polycomb complexes. Best characterized in Drosophila, PREs provide an important model for understanding Polycomb recruitment, H3K27me3, H2AK119ub, epigenetic memory, and developmental gene repression.

The post Polycomb Response Elements (PREs) appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/polycomb-response-elements-pres/feed/ 0 PRC1 Recruitment Mechanism https://www.laboratorynotes.com/prc1-recruitment-mechanism/ https://www.laboratorynotes.com/prc1-recruitment-mechanism/#respond Tue, 29 Sep 2026 23:29:17 +0000 https://www.laboratorynotes.com/?p=32430 PRC1 complexes use multiple mechanisms to target chromatin, including CBX recognition of H3K27me3, KDM2B recognition of unmethylated CpG-rich DNA, transcription-factor interactions, and other chromatin-associated signals.

The post PRC1 Recruitment Mechanism appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/prc1-recruitment-mechanism/feed/ 0 Specialized PRC1 Complexes: PRC1.1, PRC1.3, PRC1.5, and PRC1.6 https://www.laboratorynotes.com/specialized-prc1-complexes-prc1-1-prc1-3-prc1-5-and-prc1-6/ https://www.laboratorynotes.com/specialized-prc1-complexes-prc1-1-prc1-3-prc1-5-and-prc1-6/#respond Tue, 29 Sep 2026 23:24:03 +0000 https://www.laboratorynotes.com/?p=32427 Specialized PRC1 complexes such as PRC1.1, PRC1.3, PRC1.5, and PRC1.6 use different PCGF proteins and recruitment mechanisms to regulate H2AK119ub, chromatin organization, gene repression, development, and cellular identity.

The post Specialized PRC1 Complexes: PRC1.1, PRC1.3, PRC1.5, and PRC1.6 appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/specialized-prc1-complexes-prc1-1-prc1-3-prc1-5-and-prc1-6/feed/ 0 KDM2B https://www.laboratorynotes.com/kdm2b/ https://www.laboratorynotes.com/kdm2b/#respond Tue, 29 Sep 2026 23:19:24 +0000 https://www.laboratorynotes.com/?p=32424 KDM2B is an important chromatin regulator and targeting component of PRC1.1. Learn how its CXXC domain recognizes unmethylated CpG-rich DNA and contributes to Polycomb-mediated H2AK119ub, gene repression, development, stem-cell regulation, and epigenetic memory.

The post KDM2B appeared first on Laboratory Notes.

]]> https://www.laboratorynotes.com/kdm2b/feed/ 0