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Genetic Disorders

Summary

Genes are the building blocks of heredity. They are passed from parent to child. They hold DNA, the instructions for making proteins. Proteins do most of the work in cells. They move molecules from one place to another, build structures, break down toxins, and do many other maintenance jobs.

Sometimes there is a mutation, a change in a gene or genes. The mutation changes the gene's instructions for making a protein, so the protein does not work properly or is missing entirely. This can cause a medical condition called a genetic disorder.

You can inherit a gene mutation from one or both parents. A mutation can also happen during your lifetime.

There are three types of genetic disorders:

  • Single-gene disorders, where a mutation affects one gene. Sickle cell anemia is an example.
  • Chromosomal disorders, where chromosomes (or parts of chromosomes) are missing or changed. Chromosomes are the structures that hold our genes. Down syndrome is a chromosomal disorder.
  • Complex disorders, where there are mutations in two or more genes. Often your lifestyle and environment also play a role. Colon cancer is an example.

Genetic tests on blood and other tissue can identify genetic disorders.

NIH: National Library of Medicine

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Diagnosis and Tests

Treatments and Therapies

  • From the National Institutes of Health (National Library of Medicine)

Living With

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Specifics

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  • From the National Institutes of Health (National Library of Medicine)
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Statistics and Research

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Clinical Trials

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Journal Articles References and abstracts from MEDLINE/PubMed (National Library of Medicine)

Reference Desk

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Children

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Teenagers

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Women

  • (American College of Obstetricians and Gynecologists)

Patient Handouts

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