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    Autosomal dominant

    Inheritance - autosomal dominant; Genetics - autosomal dominant

    Autosomal dominant is one of several ways that a trait or disorder can be passed down through families.

    If a disease is autosomal dominant, it means you only need to get the abnormal gene from one parent in order for you to inherit the disease. One of the parents may often have the disease.

    Information

    Inheriting a disease, condition, or trait depends on the type of chromosome affected (autosomal or sex chromosome). It also depends on whether the trait is dominant or recessive.

    A single, abnormal gene on one of the first 22 nonsex chromosomes from either parent can cause an autosomal disorder.

    Dominant inheritance means an abnormal gene from one parent can cause disease, even though the matching gene from the other parent is normal. The abnormal gene dominates.

    Each child’s risk is independent of whether their sibling has the disorder or not. For example, if the first child has the disorder, the next child has the same 50% risk of inheriting the disorder. Children who do not inherit the abnormal gene will not develop or pass on the disease.

    If someone has an abnormal gene that is inherited in an autosomal dominant manner, then the parents should also be tested for the abnormal gene.

    Examples of autosomal dominant disorders include Huntington's disease and neurofibromatosis-1.

    See also:

    • Autosomal recessive
    • Heredity and disease
    • Sex-linked dominant
    • Sex-linked recessive

    References

    Korf BR. Principles of Genetics. In: Goldman L, Ausiello D, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 39.

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    • Autosomal dominant genes

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      • Autosomal dominant genes

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      A Closer Look

        Review Date: 5/16/2012

        Reviewed By: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.

        The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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