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Genetic Screening

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Breast Cancer…
Is Genetic Screening the Answer?

By: Wendy Wilburn

Biology 2020 – Biology II
Dr. Robinson

April 25, 2015

The Great Genetic Screening Debate

ABSTRACT

Within the past thirty years, researchers have found strong evidence that our DNA or genetic material may be a predictive factor for disease probability. This has lead to the development of genetic testing after the isolation of certain candidate genes. Although predictive genetic screening is only available for a selective number of diseases, its ramifications have become hot topics for debated issues in a broad range of arenas from governmental agencies to religious applications. (1). This debate began in 1993 when researchers isolated the BRCA1 gene, which is associated with the increased risk of developing breast cancer (1). The discovery of this gene leads to hope and speculation for development of a predictive genetic test that could identify women at risk for developing breast cancer. The purpose of my paper is to delve into the positives and negatives of predictive genetic testing, as it is applied to breast cancer precursors.

INTRODUCTION Before I go into details about how these genetic tests were developed, I want to first discuss how certain genes can trigger an inactive disease. The human body requires the actions of many proteins working together. For a protein to work properly, an intact gene must be encoded for a specific protein. A mutation describes a gene which has genetically been altered or changed. The most common type of mutation is a single change of a nucleotide in the DNA, but there are also other types of mutations, including loss or gain of a nucleotide, which is the disappearance of a segment of DNA (2). Mutations can have three basic effects: beneficial, harmful or no effect. Mutations can be beneficial if the fitness of an individual is enhanced.

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