Byetta Attorneys Bulletin
Byetta Attorneys: But the most convenient and therefore most frequently used way for a cell to rid itself of a gene is more subtle. Most often, a gene will suffer only a single base change—a point mutation—in one of its sequences. Such a subtle change may have deadly consequences if it strikes a critical sequence in the gene. Point mutations may insert inappropriate punctuation marks into the middle of a gene; because these marks normally signal the end of a gene, they may terminate the read-out of the gene prematurely, causing truncation of the protein specified by this gene. Other times, the protein product of the gene may suffer some change in its string of amino acids that renders it nonfunctional. The result of all these mutations, large and small, will be the same: The cell will lose the services of the mutated gene.
In reality, losing the services of a tumor suppressor gene is more complicated than implied here. Almost all genes in our cells are present in two redundant copies, one deriving originally from our mother’s genes, the other from our father. In the case of tumor suppressor genes, this two-copy system offers a measure of protection to the cell. If one copy of a suppressor gene is accidental lost, the remaining gene copy serves as a perfectly adequate backup. Almost always, half a brake lining is as good as a whole one in slowing down cell growth.
Tumor cells usually resort to a more expedient way of eliminating the second copy of a tumor suppressor gene. Their strategy depends on the fact that the two partners in a human chromosome pair (such as the two thirteenth chromosomes, each of which carries an Rb gene copy) often line up next to one another in parallel array, look each other over, compare their respective DNA sequences, and then swap genetic information. One frequent result is that a gene sequence present on one chromosome will now replace the corresponding sequence carried by its partner. Before this information transfer, two distinct versions of a gene may have resided on the two paired chromosomes; afterward, one of these versions is lost, being replaced by a duplicated version of the gene originally present on the other chromosome. The result is two identical copies of a gene in a cell that previously carried two dissimilar versions.
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