Wikipedia

SMARCA4

Transcription activator BRG1 also known as ATP-dependent chromatin remodeler SMARCA4 is a protein that in humans is encoded by the SMARCA4 gene.[5]

SMARCA4
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesSMARCA4, BAF190, BAF190A, BRG1, MRD16, RTPS2, SNF2, SNF2L4, SNF2LB, SWI2, hSNF2b, CSS4, SWI/SNF related, matrix associated, actin dependent regulator of chromatin, subfamily a, member 4
External IDsOMIM: 603254; MGI: 88192; HomoloGene: 135927; GeneCards: SMARCA4; OMA:SMARCA4 - orthologs
Orthologs
SpeciesHumanMouse
Entrez

6597

20586

Ensembl

ENSG00000127616

ENSMUSG00000032187

UniProt

P51532
Q9HBD4

Q3TKT4

RefSeq (mRNA)

NM_001174078
NM_001174079
NM_011417
NM_001357764

RefSeq (protein)

NP_001167549
NP_001167550
NP_035547
NP_001344693

Location (UCSC)Chr 19: 10.96 – 11.07 MbChr 9: 21.53 – 21.62 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

Function

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The protein encoded by this gene is a member of the SWI/SNF family of proteins and is similar to the brahma protein of Drosophila. Members of this family have helicase and ATPase activities and are thought to regulate transcription of certain genes by altering the chromatin structure around those genes. The encoded protein is part of the large ATP-dependent chromatin remodeling complex SWI/SNF, which is required for transcriptional activation of genes normally repressed by chromatin. In addition, this protein can bind BRCA1, as well as regulate the expression of the tumorigenic protein CD44.[6]

BRG1 works to activate or repress transcription. Having functional BRG1 is important for development past the pre-implantation stage. Without having a functional BRG1, exhibited with knockout research, the embryo will not hatch out of the zona pellucida, which will inhibit implantation from occurring on the endometrium (uterine wall). BRG1 is also crucial to the development of sperm. During the first stages of meiosis in spermatogenesis there are high levels of BRG1. When BRG1 is genetically damaged, meiosis is stopped in prophase 1, hindering the development of sperm and would result in infertility. More knockout research has concluded BRG1’s aid in the development of smooth muscle. In a BRG1 knockout, smooth muscle in the gastrointestinal tract lacks contractility, and intestines are incomplete in some cases. Another defect occurring in knocking out BRG1 in smooth muscle development is heart complications such as an open ductus arteriosus after birth.[7][8]

Clinical significance

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BRG1 (or SMARCA4) is the most frequently mutated chromatin remodeling ATPase in cancer.[9] Mutations in this gene were first recognized in human cancer cell lines derived from adrenal gland[10] and lung.[11] Later it was recognized that mutations exist in a significant frequency of medulloblastoma and pancreatic cancers, and in many other tumor subtypes.[12][13][14]

In cancer, mutations in BRG1 show an unusually high preference for missense mutations that are frequently heterozygous and target the ATPase domain.[15][9] Mutations are enriched at highly conserved ATPase sequences,[16] which lie on important functional surfaces such as the ATP pocket or DNA-binding surface.[15] These mutations act in a genetically dominant manner to alter chromatin regulatory function at enhancers[15] and promoters.[16]

Mutations of BRG1 are associated with context-dependent expression changes at MYC-genes, which indicates that the BRG1 and MYC proteins are functionally related.[15][11][17] Another study demonstrated a causal role of BRG1 in the control of retinoic acid and glucocorticoid-induced cell differentiation in lung cancer and in other tumor types. This enables the cancer cell to sustain undifferentiated gene expression programs that affect the control of key cellular processes. Furthermore, it explains why lung cancer and other solid tumors are completely refractory to treatments based on these compounds that are effective therapies for some types of leukemia.[18]

The role of BRG1 in sensitivity or resistance to anti-cancer drugs had been recently highlighted by the elucidation of the mechanisms of action of darinaparsin, an arsenic-based anti-cancer drugs. Darinaparsin has been shown to induce phosphorylation of BRG1, which leads to its exclusion from chromatin. When excluded from the chromatin, BRG1 can no longer act as a transcriptional co-regulator. This leads to the inability of cells to express HO-1, a cytoprotective enzyme.[19]

Interactions

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SMARCA4 has been shown to interact with:

References

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  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000127616 – Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000032187 – Ensembl, May 2017
  3. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ^ Chiba H, Muramatsu M, Nomoto A, Kato H (May 1994). "Two human homologues of Saccharomyces cerevisiae SWI2/SNF2 and Drosophila brahma are transcriptional coactivators cooperating with the estrogen receptor and the retinoic acid receptor". Nucleic Acids Research. 22 (10): 1815–20. doi:10.1093/nar/22.10.1815. PMC 308079. PMID 8208605.
  6. ^ "Entrez Gene: SMARCA4 SWI/SNF related, matrix associated, actin dependent regulator of chromatin, subfamily a, member 4".
  7. ^ Kim Y, Fedoriw AM, Magnuson T (March 2012). "An essential role for a mammalian SWI/SNF chromatin-remodeling complex during male meiosis". Development. 139 (6): 1133–40. doi:10.1242/dev.073478. PMC 3283123. PMID 22318225.
  8. ^ Zhang M, Chen M, Kim JR, Zhou J, Jones RE, Tune JD, Kassab GS, Metzger D, Ahlfeld S, Conway SJ, Herring BP (July 2011). "SWI/SNF complexes containing Brahma or Brahma-related gene 1 play distinct roles in smooth muscle development". Molecular and Cellular Biology. 31 (13): 2618–31. doi:10.1128/MCB.01338-10. PMC 3133369. PMID 21518954.
  9. ^ a b Hodges C, Kirkland JG, Crabtree GR (August 2016). "The Many Roles of BAF (mSWI/SNF) and PBAF Complexes in Cancer". Cold Spring Harbor Perspectives in Medicine. 6 (8): a026930. doi:10.1101/cshperspect.a026930. PMC 4968166. PMID 27413115.
  10. ^ Dunaief JL, Strober BE, Guha S, Khavari PA, Alin K, Luban J, Begemann M, Crabtree GR, Goff SP (October 1994). "The retinoblastoma protein and BRG1 form a complex and cooperate to induce cell cycle arrest". Cell. 79 (1): 119–30. doi:10.1016/0092-8674(94)90405-7. PMID 7923370. S2CID 7058539.
  11. ^ a b Medina PP, Romero OA, Kohno T, Montuenga LM, Pio R, Yokota J, Sanchez-Cespedes M (May 2008). "Frequent BRG1/SMARCA4-inactivating mutations in human lung cancer cell lines". Human Mutation. 29 (5): 617–22. doi:10.1002/humu.20730. PMID 18386774. S2CID 8596785.
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  23. ^ Inoue H, Furukawa T, Giannakopoulos S, Zhou S, King DS, Tanese N (November 2002). "Largest subunits of the human SWI/SNF chromatin-remodeling complex promote transcriptional activation by steroid hormone receptors". The Journal of Biological Chemistry. 277 (44): 41674–85. doi:10.1074/jbc.M205961200. PMID 12200431.
  24. ^ Hill DA, de la Serna IL, Veal TM, Imbalzano AN (April 2004). "BRCA1 interacts with dominant negative SWI/SNF enzymes without affecting homologous recombination or radiation-induced gene activation of p21 or Mdm2". Journal of Cellular Biochemistry. 91 (5): 987–98. doi:10.1002/jcb.20003. PMID 15034933. S2CID 40668596.
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  26. ^ Barker N, Hurlstone A, Musisi H, Miles A, Bienz M, Clevers H (September 2001). "The chromatin remodelling factor Brg-1 interacts with beta-catenin to promote target gene activation". The EMBO Journal. 20 (17): 4935–43. doi:10.1093/emboj/20.17.4935. PMC 125268. PMID 11532957.
  27. ^ Nielsen AL, Sanchez C, Ichinose H, Cerviño M, Lerouge T, Chambon P, Losson R (November 2002). "Selective interaction between the chromatin-remodeling factor BRG1 and the heterochromatin-associated protein HP1alpha". The EMBO Journal. 21 (21): 5797–806. doi:10.1093/emboj/cdf560. PMC 131057. PMID 12411497.
  28. ^ a b DiRenzo J, Shang Y, Phelan M, Sif S, Myers M, Kingston R, Brown M (October 2000). "BRG-1 is recruited to estrogen-responsive promoters and cooperates with factors involved in histone acetylation". Molecular and Cellular Biology. 20 (20): 7541–9. doi:10.1128/MCB.20.20.7541-7549.2000. PMC 86306. PMID 11003650.
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  31. ^ Shanahan F, Seghezzi W, Parry D, Mahony D, Lees E (February 1999). "Cyclin E associates with BAF155 and BRG1, components of the mammalian SWI-SNF complex, and alters the ability of BRG1 to induce growth arrest". Molecular and Cellular Biology. 19 (2): 1460–9. doi:10.1128/mcb.19.2.1460. PMC 116074. PMID 9891079.
  32. ^ Ichinose H, Garnier JM, Chambon P, Losson R (March 1997). "Ligand-dependent interaction between the estrogen receptor and the human homologues of SWI2/SNF2". Gene. 188 (1): 95–100. doi:10.1016/S0378-1119(96)00785-8. PMID 9099865.
  33. ^ a b c d e Otsuki T, Furukawa Y, Ikeda K, Endo H, Yamashita T, Shinohara A, Iwamatsu A, Ozawa K, Liu JM (November 2001). "Fanconi anemia protein, FANCA, associates with BRG1, a component of the human SWI/SNF complex". Human Molecular Genetics. 10 (23): 2651–60. doi:10.1093/hmg/10.23.2651. PMID 11726552.
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  45. ^ Marignani PA, Kanai F, Carpenter CL (August 2001). "LKB1 associates with Brg1 and is necessary for Brg1-induced growth arrest". The Journal of Biological Chemistry. 276 (35): 32415–8. doi:10.1074/jbc.C100207200. PMID 11445556.

Further reading

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