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Somatic gene therapy is a pioneering medical technique aimed at treating genetic diseases by introducing a functional gene into the cells of an individual.
These cells are typically non-reproductive, meaning the changes affect only the patient and are not inherited by their offspring. The process involves modifying the genes of somatic (or body) cells, such as skin cells, muscle cells, or blood cells. This targeted approach ensures that only specific tissues or organs are affected, thus reducing the risk of unintended genetic consequences.

• This therapy is primarily used to treat life-threatening conditions, such as certain types of cancer or genetic disorders like cystic fibrosis.
• It focuses on alleviating symptoms and improving quality of life without altering the individual's genetic makeup in a heritable way.

Because the modified genes are confined to somatic cells, somatic gene therapy has no impact on evolution. The therapeutic effects die with the individual, preventing changes from being passed to the next generation. Instead, its role is confined to a single individual's health and clinical outcomes.

Germline gene therapy is a transformative and controversial technique that involves altering the DNA of reproductive cells, such as sperm, eggs, or embryos.
By making changes at this developmental stage, any alterations can be passed down to offspring, potentially impacting future generations. This type of therapy is controversial, as it raises ethical and moral questions about long-term implications.

• It offers the possibility of correcting genetic anomalies at their source, preventing hereditary diseases from being transmitted.
• Potential risks include unforeseen side effects or the ethical dilemma of "designing" traits in future generations.

Some scientists argue that germline gene therapy could be a tool for eradicating genetic diseases.
Others worry about the potential for unequal access or the rise of "designer babies." The main difference from somatic therapy is its heritable nature, allowing it to influence the gene pool over time.

Gene therapy's potential impact on evolution largely hinges on the approach used—somatic or germline. Germline gene therapy holds the possibility for significant evolutionary changes. Because it alters the genetic material of reproductive cells, any modification is present in all the individual's cells from birth and can be passed to future generations. This could accelerate the shift in the human population's genetic traits, allowing for the rapid spread of desirable or beneficial traits throughout a population. While somatic gene therapy plays an insignificant role in evolution due to its non-heritable nature, germline modifications can influence the direction of human evolution.

• Advantages involve the potential for widespread eradication of genetic diseases.
• Concerns center on the ethical implications of genetic alterations being passed on to generations.

The influence of germline gene therapy on evolution is unprecedented and exciting, but it also necessitates careful consideration of the consequences it might have for human genetic diversity and ethics.