KRAS

The KRAS gene provides instructions for making a protein called K-Ras, part of the RAS/MAPK pathway. The protein relays signals from outside the cell to the cell's nucleus. These signals instruct the cell to grow and divide (proliferate) or to mature and take on specialized functions (differentiate). The K-Ras protein is a GTPase, which means it converts a molecule called GTP into another molecule called GDP. In this way the K-Ras protein acts like a switch that is turned on and off by the GTP and GDP molecules. To transmit signals, it must be turned on by attaching (binding) to a molecule of GTP. The K-Ras protein is turned off (inactivated) when it converts the GTP to GDP. When the protein is bound to GDP, it does not relay signals to the cell's nucleus. It is called KRAS because it was first identified as an oncogene in Kirsten RAt Sarcoma virus.[5] The viral oncogene was derived from cellular genome. Thus, KRAS gene in cellular genome is called a proto-oncogene.

KRAS
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesKRAS, C-K-RAS, CFC2, K-RAS2A, K-RAS2B, K-RAS4A, K-RAS4B, KI-RAS, KRAS1, KRAS2, NS, NS3, RALD, RASK2, K-ras, KRAS proto-oncogene, GTPase, c-Ki-ras2, OES, c-Ki-ras, K-Ras 2, 'C-K-RAS, K-Ras, Kirsten RAt Sarcoma virus, Kirsten Rat Sarcoma virus
External IDsOMIM: 190070 MGI: 96680 HomoloGene: 37990 GeneCards: KRAS
Gene location (Human)
Chr.Chromosome 12 (human)[1]
Band12p12.1Start25,205,246 bp[1]
End25,250,936 bp[1]
RNA expression pattern




More reference expression data
Orthologs
SpeciesHumanMouse
Entrez

3845

16653

Ensembl

ENSG00000133703

ENSMUSG00000030265

UniProt

P01116

P32883

RefSeq (mRNA)

NM_004985
NM_033360
NM_001369786
NM_001369787

NM_021284

RefSeq (protein)

NP_004976
NP_203524
NP_001356715
NP_001356716
NP_004976.2

NP_067259

Location (UCSC)Chr 12: 25.21 – 25.25 MbChr 6: 145.22 – 145.25 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

The gene product was first found as a p21 GTPase.[6][7] Like other members of the ras subfamily, the KRAS protein is a GTPase and is an early player in many signal transduction pathways. KRAS is usually tethered to cell membranes because of the presence of an isoprene group on its C-terminus. There are two protein products of the KRAS gene in mammalian cells that result from the use of alternative exon 4 (exon 4A and 4B respectively): K-Ras4A and K-Ras4B, these proteins have different structure in their C-terminal region and use different mechanisms to localize to cellular membranes including the plasma membrane.[8]

Function

KRAS acts as a molecular on/off switch, using protein dynamics. Once it is allosterically activated, it recruits and activates proteins necessary for the propagation of growth factors, as well as other cell signaling receptors like c-Raf and PI 3-kinase. KRAS upregulates the GLUT1 glucose transporter, thereby contributing to the Warburg effect in cancer cells.[9] KRAS binds to GTP in its active state. It also possesses an intrinsic enzymatic activity which cleaves the terminal phosphate of the nucleotide, converting it to GDP. Upon conversion of GTP to GDP, KRAS is deactivated. The rate of conversion is usually slow, but can be increased dramatically by an accessory protein of the GTPase-activating protein (GAP) class, for example RasGAP. In turn, KRAS can bind to proteins of the Guanine Nucleotide Exchange Factor (GEF) class (such as SOS1), which forces the release of bound nucleotide (GDP). Subsequently, KRAS binds GTP present in the cytosol and the GEF is released from ras-GTP.

Other members of the Ras family include: HRAS and NRAS. These proteins all are regulated in the same manner and appear to differ in their sites of action within the cell.

Clinical significance when mutated

This proto-oncogene is a Kirsten ras oncogene homolog from the mammalian ras gene family. A single amino acid substitution, and in particular a single nucleotide substitution, is responsible for an activating mutation. The transforming protein that results is implicated in various malignancies, including lung adenocarcinoma,[10] mucinous adenoma, ductal carcinoma of the pancreas and colorectal cancer.[11][12]

Several germline KRAS mutations have been found to be associated with Noonan syndrome[13] and cardio-facio-cutaneous syndrome.[14]

Somatic KRAS mutations are found at high rates in leukemias, colorectal cancer,[15] pancreatic cancer[16] and lung cancer.[17]

Colorectal cancer

The impact of KRAS mutations is heavily dependent on the order of mutations. Primary KRAS mutations generally lead to a self-limiting hyperplastic or borderline lesion, but if they occur after a previous APC mutation it often progresses to cancer.[18] KRAS mutations are more commonly observed in cecal cancers than colorectal cancers located in any other places from ascending colon to rectum.[19][20]

KRAS mutation is predictive of a very poor response to panitumumab (Vectibix) and cetuximab (Erbitux) therapy in colorectal cancer.[21]

Currently, the most reliable way to predict whether a colorectal cancer patient will respond to one of the EGFR-inhibiting drugs is to test for certain “activating” mutations in the gene that encodes KRAS, which occurs in 30%–50% of colorectal cancers. Studies show patients whose tumors express the mutated version of the KRAS gene will not respond to cetuximab or panitumumab.[22]

Although presence of the wild-type (or normal) KRAS gene does not guarantee that these drugs will work, a number of large studies[23][24] have shown that cetuximab has significant efficacy in mCRC patients with KRAS wild-type tumors. In the Phase III CRYSTAL study, published in 2009, patients with the wild-type KRAS gene treated with Erbitux plus chemotherapy showed a response rate of up to 59% compared to those treated with chemotherapy alone. Patients with the KRAS wild-type gene also showed a 32% decreased risk of disease progression compared to patients receiving chemotherapy alone.[24]

Emergence of KRAS mutations is a frequent driver of acquired resistance to cetuximab anti-EGFR therapy in colorectal cancers. The emergence of KRAS mutant clones can be detected non-invasively months before radiographic progression. It suggests to perform an early initiation of a MEK inhibitor as a rational strategy for delaying or reversing drug resistance.[25]

KRAS amplification

KRAS gene can also be amplified in colorectal cancer. KRAS amplification is mutually exclusive with KRAS mutations. Tumors or cell lines harboring this genetic lesion are not responsive to EGFR inhibitors. Although KRAS amplification is an infrequent event in colorectal cancer, it might be responsible for precluding response to anti-EGFR treatment in some patients.[26] Amplification of wild-type Kras has also been observed in ovarian,[27] gastric, uterine, and lung cancers.[28]

Lung cancer

Whether a patient is positive or negative for a mutation in the epidermal growth factor receptor (EGFR) will predict how patients will respond to certain EGFR antagonists such as erlotinib (Tarceva) or gefitinib (Iressa). Patients who harbor an EGFR mutation have a 60% response rate to erlotinib. However, the mutation of KRAS and EGFR are generally mutually exclusive.[29][30][31] Lung cancer patients who are positive for KRAS mutation (and the EGFR status would be wild type) have a low response rate to erlotinib or gefitinib estimated at 5% or less.[29]

Different types of data including mutation status and gene expression did not have a significant prognostic power.[32] No correlation to survival was observed in 72% of all studies with KRAS sequencing performed in non-small cell lung cancer (NSCLC).[32] However, KRAS mutations can not only affect the gene itself and the expression of the corresponding protein, but can also influence the expression of other downstream genes involved in crucial pathways regulating cell growth, differentiation and apoptosis. The different expression of these genes in KRAS-mutant tumors might have a more prominent role in affecting patient’s clinical outcomes.[32]

A 2008 paper published in Cancer Research concluded that the in vivo administration of the compound oncrasin-1 "suppressed the growth of K-ras mutant human lung tumor xenografts by >70% and prolonged the survival of nude mice bearing these tumors, without causing detectable toxicity", and that the "results indicate that oncrasin-1 or its active analogues could be a novel class of anticancer agents which effectively kill K-Ras mutant cancer cells."[33]

KRAS testing

In July 2009, the US Food and Drug Administration (FDA) updated the labels of two anti-EGFR monoclonal antibody drugs indicated for treatment of metastatic colorectal cancer, panitumumab (Vectibix) and cetuximab (Erbitux), to include information about KRAS mutations.[34]

In 2012, the FDA also cleared QIAGEN's therascreen KRAS test, which is a genetic test designed to detect the presence of seven mutations in the KRAS gene in colorectal cancer cells. This test is used to aid physicians in identifying patients with metastatic colorectal cancer for treatment with Erbitux. The presence of KRAS mutations in colorectal cancer tissue indicates that the patient may not benefit from treatment with Erbitux. If the test result indicates that the KRAS mutations are absent in the colorectal cancer cells, then the patient may be considered for treatment with Erbitux.[35]

As a drug target

Driver mutations in KRAS underlie the pathogenesis of up to 20% of human cancers.[36] Hence KRAS is an attractive drug target, however lack of obvious binding sites has hindered pharmaceutical development.[37] One potential drug interaction site is where GTP/GDP binds. However due to the extraordinarily high affinity of GTP/GDP for this site, it is unlikely that drug-like small molecule inhibitors could compete with GTP/GDP binding. Other than where GTP/GDP binds, there are no obvious high affinity binding sites for small molecules.[38]

G12C mutation

One fairly frequent driver mutation is KRASG12C which is adjacent a shallow binding site. This has allowed the development of electrophilic KRAS inhibitors that can form irreversible covalent bonds with nucleophilic sulfur atom of Cys-12 and hence selectively target KRASG12C and leave wild-type KRAS untouched.[39] Two KRASG12C mutant covalent inhibitors have reached clinical testing: AMG 510 (Amgen)[40] and MRTX-849 (Mirati Therapeutics)[41][42] while ARS-3248 (Wellspring Biosciences/Janssen) has received an investigational new drug (IND) approval to start clinical trials.[43] An antisense oligonucleotide (ASO), AZD4785 (AstraZeneca/Ionis Therapeutics) targeting KRAS has completed a phase I study[44] but was discontinued from further development because of insufficient knockdown of the target.[45]

Interactions

KRAS has been shown to interact with:

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gollark: Idea: dynamic generation of arbitrary private channels in ubquarantine.
gollark: The advantage of dynamic linking is that you can make ridiculously tiny binaries and show off how small* your program is.
gollark: Yes, dynamic linking actually very not good.
gollark: I heard that they were LYING and it CANNOT REALLY.

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Further reading
  • Tsuchida N, Murugan AK, Grieco M (2016). "Kirsten Ras oncogene : significance of its discovery in human cancer research". Oncotarget. 7 (29): 46717–33. doi:10.18632/oncotarget.8773. PMC 5216832. PMID 27102293.
  • Kahn S, Yamamoto F, Almoguera C, Winter E, Forrester K, Jordano J, Perucho M (1987). "The c-K-ras gene and human cancer (review)". Anticancer Research. 7 (4A): 639–52. PMID 3310850.
  • Yamamoto F, Nakano H, Neville C, Perucho M (1985). "Structure and mechanisms of activation of c-K-ras oncogenes in human lung cancer". Progress in Medical Virology. Fortschritte der Medizinischen Virusforschung. Progres en Virologie Medicale. 32: 101–14. PMID 3895297.
  • Porta M, Ayude D, Alguacil J, Jariod M (February 2003). "Exploring environmental causes of altered ras effects: fragmentation plus integration?". Molecular Carcinogenesis. 36 (2): 45–52. doi:10.1002/mc.10093. PMID 12557259.
  • Smakman N, Borel Rinkes IH, Voest EE, Kranenburg O (November 2005). "Control of colorectal metastasis formation by K-Ras". Biochimica et Biophysica Acta (BBA) - Reviews on Cancer. 1756 (2): 103–14. doi:10.1016/j.bbcan.2005.07.001. PMID 16098678.
  • Castagnola P, Giaretti W (November 2005). "Mutant KRAS, chromosomal instability and prognosis in colorectal cancer". Biochimica et Biophysica Acta (BBA) - Reviews on Cancer. 1756 (2): 115–25. doi:10.1016/j.bbcan.2005.06.003. PMID 16112461.
  • Deramaudt T, Rustgi AK (November 2005). "Mutant KRAS in the initiation of pancreatic cancer". Biochimica et Biophysica Acta (BBA) - Reviews on Cancer. 1756 (2): 97–101. doi:10.1016/j.bbcan.2005.08.003. PMID 16169155.
  • Pretlow TP, Pretlow TG (November 2005). "Mutant KRAS in aberrant crypt foci (ACF): initiation of colorectal cancer?". Biochimica et Biophysica Acta (BBA) - Reviews on Cancer. 1756 (2): 83–96. doi:10.1016/j.bbcan.2005.06.002. PMID 16219426.
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