Epigenetics
Epigenetics research delves into the molecular mechanisms that control gene expression and cellular traits without altering the underlying DNA sequence. One crucial aspect of this field is the role of small molecules, which act as powerful regulators of epigenetic modifications. These small compounds, typically comprising a few dozen to a few hundred atoms, have emerged as essential tools in understanding and manipulating the epigenome.
- DNA Methylation Inhibitors: Small molecules like 5-azacytidine and 5-aza-2'-deoxycytidine are DNA methyltransferase inhibitors. They block the addition of methyl groups to DNA, leading to DNA demethylation. This can reactivate silenced genes, potentially offering therapeutic avenues for conditions like cancer.
- HDAC inhibitors: HDACs remove acetyl groups from histone proteins, contributing to gene repression. Small molecule HDAC inhibitors, such as Vorinostat and Romidepsin, can reverse this process by increasing histone acetylation, allowing genes to be more accessible for transcription. These inhibitors are being explored for cancer therapy and other conditions.
- Histone Methyltransferase Inhibitors: Small molecules like GSK126 inhibit specific histone methyltransferases, affecting histone methylation patterns. This can alter gene expression, making them promising candidates for cancer and other diseases with epigenetic dysregulation.
- RNA Modulators: Small molecules can also target non-coding RNAs involved in epigenetic regulation. For instance, small molecules called small interfering RNAs (siRNAs) can be designed to target and degrade specific long non-coding RNAs, influencing gene expression.
- Epigenetic Reader Domain Inhibitors: These small molecules target proteins that recognize and bind to specific epigenetic marks. Examples include inhibitors of bromodomain-containing proteins (BET inhibitors), which can disrupt gene regulation by interfering with protein-DNA interactions.
Small molecules in epigenetics research not only provide insights into the fundamental biology of gene regulation but also hold immense promise for developing novel therapeutics. Their ability to selectively modulate specific epigenetic marks and pathways has led to ongoing clinical trials and drug development efforts for various diseases, including cancer, neurological disorders, and inflammatory conditions. Understanding and harnessing the power of these small molecules is at the forefront of modern epigenetics research, offering new hope for precision medicine and targeted therapies.
3 key components involved in the regulation of epigenetic modifications
Epigenetics Writer
Epigenetics writers are enzymes responsible for adding chemical marks or modifications to DNA or histone proteins. These marks include DNA methylation (addition of methyl groups to DNA) and histone modifications (such as acetylation, methylation, phosphorylation, etc.).
Epigenetics Reader
Function: Epigenetics readers are proteins that can recognize and bind to specific epigenetic marks on DNA or histones. These reader proteins interpret the epigenetic code and facilitate downstream cellular processes, such as gene activation or repression.
Epigenetics Eraser
Function: Epigenetics erasers are enzymes responsible for removing or reversing epigenetic marks on DNA or histones. This process allows for the dynamic regulation of gene expression and the resetting of epigenetic states during various stages of development and in response to environmental changes.
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HDAC inhibitor
4SC-202 is an orally bioavailable benzamide and inhibitor of human class I histone deacetylases (HDACs) isoenzymes 1, 2 and 3, with potential antineoplastic activity. -
PARP-1 inhibitor
TAK1/MAP4K2 inhibitor 1 is a potent dual inhibitor targeting transforming growth factor β-activated kinase 1 (TAK1) and mitogen-activated protein kinase kinase kinase kinase 2 (MAP4K2), exhibiting IC₅₀ values of 41.1 nM and 18.2 nM, respectively.
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Aurora Kinase inhibitor
SAR156497 is an exquisitely selective Aurora A, B, and C inhibitor with in vitro and in vivo efficacy with IC50 = 0.5 nM (Aurora A), 1 nM (Aurora B / incenp), 3 nM (Aurora C / incenp) respectively SAR156497 combines high in vitro potency with satisfactory metabolic stability and limited CYP3A4 and PDE3 inhibition. -
JAK inhibitor
Peficitinib is a novel potent JAK inhibitor, which demonstrated potent efficacy in adjuvant-induced arthritis model in rats. -
SIRT 6 inhibitor
OSS-128167, also known as SIRT6-IN-1, is a potent and selective SIRT 6 inhibitor with IC50 value of 89 μM. -
HDAC8 inhibitor
HDAC8-IN-1, is a HDAC8 inhibitor with an IC50 of 27.2 nM in cancer cell lines. -
SIRT2 inhibitor
Thiomyristoyl is a potent and specific SIRT2 inhibitor with an IC50 of 28 nM. -
JAK1 and TYK2 inhibitor
PF-06700841 is an inhibitor of JAK1 and TYK2 kinases. CAS: 1883299-62-4 (free base) -
BET inhibitor
Mivebresib, also known as ABBV-075, is a potent BET inhibitor (bromodomain (BRD)-containing proteind) with potential antineoplastic activity. - Procaine hydrochloride is a local anesthetic of the ester type that has a slow onset and a short duration of action. It is mainly used for infiltration anesthesia, peripheral nerve block, and spinal block.
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HDAC inhibitor
Tucidinostat is a potent and orally bioavailable HDAC enzymes class I (HDAC1/2/3) and class IIb (HDAC10) inhibitor, with IC50s of 95, 160, 67 and 78 nM, less active on HDAC8 and HDAC11 (IC50s, 733 nM, 432 nM, respectively), and shows no effect on HDAC4/5/6/7/9. -
PTP inhibitor
Sodium stibogluconate (Stibogluconate trisodium nonahydrate) is a potent inhibitor of protein tyrosine phosphatase. Sodium stibogluconate inhibits 99% of SHP-1, SHP-2 and PTP1B activity at 10, 100, 100 μg/mL, respectively. -
PARP inhibitor
Rucaparib Camsylate is an inhibitor of PARP with a Ki of 1.4 nM for PARP1, and also shows binding affinity to eight other PARP domains. -
PARP1 and PARP2 inhibitor
Niraparib hydrochloride (MK-4827 hydrochloride) is a highly potent and orally bioavailable PARP1 and PARP2 inhibitor with IC50s of 3.8 and 2.1 nM, respectively. -
JAK1 Inhibitor
Upadacitinib (ABT-494) is a potent and selective Janus kinase (JAK) 1 inhibitor being developed for the treatment of several autoimmune disorders with an IC50 of 43 nM. IC50 & Target: IC50: 43 nM (JAK1), 200 nM (JAK2) -
JAK1 inhibitor
Abrocitinib (PF-04965842) is a potent, orally active and selective JAK1 inhibitor, with IC50s of 29 and 803 nM for JAK1 and JAK2, respectively. Abrocitinib (PF-04965842) exhibits less active effect on TYK2 (IC50, 1.253 μM), and inhibits phosphorylation of STAT1, STAT3 and STAT5 after stimulation. Effective in autoimmune disease. -
JAK3 inhibitor
JAK3-IN-2 is a potent and highly selective JAK3 inhibitor with IC50 of 0.15 nM. dispalys >4,300-fold selectivity over JAK1, JAK2 and TYK2, and other kinases BMX, EGFR, ITK and BTK; blocks cytokine signaling through JAK3, but not through other JAK family enzymes; inhibits IL-7 induced pSTAT5 in CD3+, CD8+ T cells with IC50 of 280 nM; sufficiently blocks the development of inflammation in a rat model of rheumatoid arthritis, while sparing hematopoiesis. -
LSD1 inhibitor
T-3775440 (hydrochloride) is an irreversible lysine-specific histone demethylase (LSD1) inhibitor with an IC50 value of 2.1 nM. -
HDAC inhibitor
EDO-S101 is a pan HDAC inhibitor; inhibits HDAC1, HDAC2 and HDAC3 with IC50 values of 9, 9 and 25 nM, respectively. -
selective BET inhibitor
PLX51107 is a potent and selective BET inhibitor, with Kds of 1.6, 2.1, 1.7, and 5 nM for BD1 and 5.9, 6.2, 6.1, and 120 nM for BD2 of BRD2, BRD3, BRD4, and BRDT, respectively; PLX51107 also interacts with the bromodomains of CBP and EP300 (Kd, in the 100 nM range).
