The term "bcr abl Proto Oncogenes" is often spelled out phonetically as "bee-see-are ay-bee-ell proh-toh ahn-kuh-jeenz." The letters "bcr abl" refer to specific genes that have been found to be involved in the development of certain types of cancer. The "Proto Oncogenes" are a group of genes that, if mutated, can lead to the development of cancerous cells. Understanding the spelling of these terms is essential for healthcare professionals who diagnose and treat patients with cancer.
BCR-ABL proto-oncogenes, also known as the Philadelphia chromosome, refers to a specific genetic rearrangement found in certain types of cancer cells, particularly in chronic myelogenous leukemia (CML) and a subset of acute lymphoblastic leukemia (ALL). It is a fusion gene created by the translocation of genetic material between chromosomes 9 and 22, resulting in the abnormal formation of a fusion protein called BCR-ABL.
The BCR-ABL fusion gene is the consequence of a chromosomal abnormality known as the Philadelphia chromosome, which occurs when a piece of chromosome 9 and a piece of chromosome 22 break off and switch places during cell division. As a result, the ABL proto-oncogene from chromosome 9 is fused with the BCR (breakpoint cluster region) gene from chromosome 22.
This genetic fusion leads to the production of the BCR-ABL fusion protein, which has constitutive tyrosine kinase activity. Tyrosine kinase is an enzyme that plays a crucial role in regulating cell growth and division. When BCR-ABL is activated, it continuously stimulates cell proliferation and inhibits apoptosis, leading to uncontrolled growth and division of cancer cells.
The presence of BCR-ABL proto-oncogenes in cancer cells has important clinical implications as it serves as a therapeutic target. Targeted drugs, such as tyrosine kinase inhibitors (TKIs), specifically inhibit BCR-ABL activity and have revolutionized the treatment of CML and certain forms of ALL. These drugs have significantly improved patient outcomes and survival rates, transforming CML from a fatal disease to a chronic manageable condition.