Target intelligence / Profile preview

Transcription activator BRG1 (SMARCA4) (BRG1)

Target
BRG1
Molecular classification
Transcription factor, Enzyme
01

Overview

SMARCA4 encodes the BRG1 protein, a core ATPase subunit of the SWI/SNF chromatin remodeling complex that regulates gene expression by altering chromatin structure, with helicase and ATPase activities; it acts as a tumor suppressor involved in DNA repair, replication, and cell proliferation control, but mutations lead to deficiency in various cancers including lung cancer, thoracic sarcomas, medulloblastoma, and rhabdoid tumors

Other names
ATP-dependent chromatin remodeler SMARCA4SWI/SNF-related matrix-associated actin-dependent regulator of chromatin subfamily A member 4BAF190ASNF2BSNF2L4
02

Mechanism of action

Synthetic lethality targeting SMARCA2 or DNA damage repair pathways in deficient tumors, Epigenetic modulation via Polycomb group protein inhibition, Immune checkpoint blockade exploiting MSI-H/dMMR/TMB-H phenotypes

03

Biological functions

Chromatin remodelingGene expression regulationDNA repairGenome replicationCell growth and division control
04

Disease associations

CancerCoffin-Siris syndrome
05

Safety considerations

Poor prognosis with SMARCA4 mutationsLimited responsiveness to surgery/chemotherapy/immunotherapy/targeted therapiesCo-mutations (e.g., STK11/KEAP1) worsen outcomes under chemo-immunotherapyChallenges in developing direct inhibitors due to unique molecular characteristics
06

Interacting drugs

Immune checkpoint inhibitors

7 more in the full profile.

07

Biomarkers

SMARCA4 deficiency/mutation statusNeuron-specific enolase (NSE) elevation in SMARCA4-deficient undifferentiated thoracic tumorsMicrosatellite instability-high (MSI-H)Deficient mismatch repair (dMMR)High tumor mutation burden (TMB-H)

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