Lucas Delgado
The src gene is a non-receptor tyrosine kinase protein that is encoded by the SRC gene in humans. It was first discovered in the early 1900s in chickens, where it was found to cause a type of cancer known as Rous sarcoma. The src gene was originally believed to be a viral gene, as it was present in the Rous sarcoma virus (RSV), but later research revealed that it is also present in the genes of many different birds, suggesting that it is a normal cellular gene that was incorporated into the viral genome. The src gene is oncogenic, playing a role in the development of cancer by triggering uncontrolled growth in abnormal host cells.
| Characteristics | Values |
|---|---|
| Gene type | Proto-oncogene tyrosine-protein kinase |
| Gene name | Src, Fyn, Yes, c-Src, v-Src |
| Gene function | Interacts with signaling pathways, plays a role in the regulation of embryonic development and cell growth |
| Gene structure | SH2 domain, SH3 domain, SH4 domain, catalytic domain, tyrosine kinase domain, short regulatory tail |
| Gene activation | Dephosphorylation of tyrosine 527, genetic mutations, overexpression |
| Gene expression | Ubiquitous in all cell types, higher expression in premalignant polyps, elevated levels in advanced tumor stages and metastatic potential |
| Gene inhibition | Tyrosine kinase inhibitors like dasatinib, KRX-123 |
| Gene variants | Viral src gene (v-src) found in Rous sarcoma virus (RSV), cellular src gene (c-src) found in chickens and other birds |
| Gene discovery | First sequence of v-Src published in 1980, characterization of tyrosine phosphorylation sites in 1981 |
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What You'll Learn
The src gene is found in chickens and other birds
The src gene is a fascinating component of cancer research, and its discovery is closely linked to chickens. In 1909, a chicken played a pivotal role in advancing our understanding of cancer. Through a series of experiments, Francis Peyton Rous demonstrated that viruses can cause cancer, specifically a type of cancer called fibrosarcoma in chickens. This work earned him the Nobel Prize in 1966.
The Rous sarcoma virus (RSV) was found to be the culprit, and further research in the 1960s and beyond aimed to identify the specific component within the virus that induced cancer. This led to the discovery of the viral src gene, also known as v-src, which is a retroviral oncogene. The src gene was found to be responsible for triggering uncontrolled growth in abnormal host cells, leading to tumour formation.
However, the story becomes even more intriguing. While initially believed to be solely a viral gene, it was later discovered that the src gene is not exclusive to the Rous sarcoma virus. In fact, it is present in the cells of various birds, including chickens, ducks, turkeys, quail, and even an emu from the San Francisco Zoo. This finding suggested that cancer may not be primarily caused by external factors but could also be influenced by genes already present in our bodies.
The cellular version of the src gene is known as c-src and plays a role in normal cell growth and embryonic development. While it can be co-opted by viruses like RSV to promote cancer, it is also important for regular cellular functions. This dual nature of the src gene, both as a driver of cancer and a regulator of normal processes, highlights the complexity of cancer research and the potential for targeted therapies that can distinguish between healthy and malignant cells.
In summary, the src gene is found in chickens and other birds, and its discovery has provided valuable insights into the complex nature of cancer and the interplay between viral and cellular genes. The ongoing investigation into the src gene and its functions continues to shape our understanding of cancer and the development of targeted treatments.
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The src gene causes uncontrolled growth in abnormal host cells
The src gene, short for sarcoma, was first discovered in chickens. It was initially observed that every cell in a chicken tumour contained the Rous sarcoma virus (RSV), suggesting that the virus was necessary to keep cells in a cancerous state. The src gene was found to be the gene responsible for the cancer-promoting activity of the virus.
The src gene is oncogenic, meaning it triggers uncontrolled growth in abnormal host cells. This gene was taken up by RSV and incorporated into its genome, allowing it to stimulate uncontrolled mitosis of host cells, providing abundant cells for fresh infection. While the src gene is not essential for RSV proliferation, its presence significantly increases virulence.
Further research revealed that the v-Src gene in RSV is required for cancer formation. The v-Src gene lacks the C-terminal inhibitory phosphorylation site (tyrosine-527), making it constitutively active, unlike normal Src (c-Src), which is only activated under specific circumstances. The activation of c-Src leads to the promotion of survival, angiogenesis, proliferation, and invasion pathways, resulting in the aberrant growth of tumours in cancers.
The discovery of the src gene and its role in cancer has had a significant impact on cancer research. It has provided valuable insights into basic cellular processes and the mechanisms underlying cancer development. The src gene has also led to the development of targeted therapies, such as imatinib (Gleevec), which blocks the action of onco-proteins.
While the src gene was first discovered in chickens, subsequent research found that a similar gene was present in various other birds, including ducks, turkeys, quail, and even an emu. These findings suggested that the src gene was not originally a viral gene but rather a normal cellular gene that RSV acquired during its evolution.
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The Rous Sarcoma Virus (RSV) picked up the src gene
The discovery of the Rous Sarcoma Virus and its link to cancer was made by Francis Peyton Rous in 1911, earning him a Nobel Prize in 1966. Rous' work involved grinding up sarcomas from chickens, removing the solid material through centrifugation, and then injecting the remaining liquid mixture into chicks. This work demonstrated that viruses could cause cancer and laid the foundation for subsequent research on the topic.
Further research in the 1960s and beyond sought to understand the specific mechanisms by which the Rous Sarcoma Virus caused cancer. It was discovered that the virus contained a single oncogene, the viral src gene, which was responsible for the transformation of primary cells in culture. This gene is an activated and overexpressed protein tyrosine kinase that triggers uncontrolled growth in abnormal host cells, leading to cancerous tumors.
The viral src gene was found to be similar to a gene present in many different birds, not just chickens, including ducks, turkeys, quail, and even an emu from the San Francisco Zoo. This led to the conclusion that the src gene was not originally a viral gene but rather a normal cellular gene that RSV had acquired. This discovery had significant implications for our understanding of cancer, suggesting that cancer may not be primarily caused by outside invaders but by our own genes.
The Rous Sarcoma Virus and the src gene continue to be important in cancer research, providing valuable insights into basic cellular processes and the mechanisms of cancer development.
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RSV causes cancer in chickens
In 1909, a chicken changed the course of cancer science. This chicken, which had a tumour, found its way into a New York laboratory. In 1911, Peyton Rous, working at Rockefeller University in New York City, conducted an experiment using this chicken. He collected and ground up sarcomas, then centrifuged them to remove the solid material. He then injected the remaining liquid mixture into healthy chickens. The extract was found to induce oncogenesis, and the tumour was found to be composed of connective tissue (a sarcoma). This virus was named the Rous sarcoma virus (RSV). RSV is a retrovirus and is the first oncovirus to have been described.
RSV causes sarcoma in chickens. Every cell in the chicken tumour contains the Rous sarcoma virus, implying that the virus is necessary to keep cells in a cancerous state. The src gene is oncogenic as it triggers uncontrolled growth in abnormal host cells. It was the first retroviral oncogene to be discovered. The src gene was taken up by RSV and incorporated into its genome, allowing it to stimulate uncontrolled mitosis of host cells, providing abundant cells for fresh infection. The src gene is not essential for RSV proliferation but it greatly increases virulence when present.
Further research has been conducted on RSV and the v-Src gene. It was found that the v-Src gene in RSV is required for the formation of cancer. Src tyrosine kinases also transmit integrin-dependent signals central to cell movement and proliferation. The first sequence of v-Src was published in 1980, and the characterization of sites for tyrosine phosphorylation in the transforming protein of Rous sarcoma virus and its normal cellular homologue was published in 1981. The discovery that a viral gene could cause cancer when inserted into cells' DNA led to the idea that genomes might be full of cancer genes derived from viruses.
The work of Harold Varmus and J. Michael Bishop of the University of California, San Francisco, led to a different conclusion. They found that a gene resembling src was present in many different birds, not just chickens. This suggested that the src gene was not originally a viral gene but rather a normal cellular gene that RSV had picked up. This implied that cancer is not primarily a disease caused by outside invaders but is caused by our own genes. Additional research confirmed that a gene related to src is present in essentially all animals, from flies to worms to humans.
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The src gene is not essential for RSV proliferation
The src gene, which stands for "sarcoma", is a gene found in the Rous sarcoma virus (RSV) that causes cancer in chickens. RSV is a retrovirus, and the src gene is a retroviral oncogene that triggers uncontrolled growth in abnormal host cells. The src gene was the first viral oncogene to be discovered, and it was identified in the early 1900s by Francis Peyton Rous, who later won the Nobel Prize in 1966.
While the src gene is not essential for RSV proliferation, its presence greatly increases the virus's virulence. RSV can proliferate without the src gene, but the src gene provides a significant advantage to the virus by stimulating uncontrolled mitosis of host cells, providing abundant cells for fresh infection.
The discovery of the src gene and its role in cancer development was groundbreaking and led to a better understanding of cancer as a disease. Researchers found that the src gene was present in many different birds, not just chickens, including ducks, turkeys, quail, and even an emu from the San Francisco Zoo. This suggested that cancer is not primarily a disease caused by external factors but rather by abnormalities in our own genes.
Further research on the src gene and its cellular counterpart, c-src, revealed important insights into normal cell growth and the mechanisms of cancer development. The src gene is involved in cell movement and proliferation, and its activation has been observed in about 50% of tumors from various organs, including the colon, liver, lung, breast, and pancreas. Abnormal activation of the c-src pathway is associated with tumor progression and metastasis.
In summary, while the src gene is not essential for RSV proliferation, it plays a crucial role in cancer development and progression by promoting uncontrolled cell growth and influencing various signaling pathways. The discovery of the src gene and its cellular counterpart has provided valuable insights into the complex nature of cancer and has paved the way for the development of targeted therapies to combat this disease.
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Frequently asked questions
Src is a gene found in Rous sarcoma virus (RSV) that causes cancer in chickens. It triggers uncontrolled growth in abnormal host cells.
v-Src is the viral Src gene of Rous sarcoma virus. It is an activated and overexpressed protein-tyrosine kinase responsible for a number of molecular events that govern rapid and dramatic phenotypic changes observed in transformed host cells.
c-Src is the cellular Src gene. It is a non-receptor tyrosine kinase protein that in humans is encoded by the SRC gene. It is involved in the regulation of embryonic development and cell growth.
Src was originally thought to be a viral gene. However, later research found that a gene resembling src was present in many different birds, not just chickens. This suggested that the src gene was not originally viral but rather a normal cellular gene that RSV had picked up.
