Dictionary > Trinucleotide repeat disorder

Trinucleotide repeat disorder

Definition
noun, plural: trinucleotide repeat disorders
Any of a set of genetic disorders caused by trinucleotide repeats exceeding the stable threshold and expanding in successive generations (thus resulting in a non-Mendelian inheritance pattern)
Supplement
Non-Mendelian inheritance is a type of biological inheritance wherein the patterns of phenotypes do not accord with those as expected in Mendelian laws on inheritance. It includes extranuclear inheritance, gene conversion, infectious heredity, genomic imprinting, mosaicism, and trinucleotide repeat disorders.
Trinucleotide repeat disorder follows non-Mendelian inheritance. It results when the trinucleotide repeats exceed the stable threshold and expand in successive generations. Many of the trinucleotide repeat disorders show neurological or cognitive symptoms. Many of them show genetic anticipation, i.e. the severity of the disorder increases with each successive generation that inherits these repeats. This means that a parent with trinucleotide repeats may not demonstrate symptoms of a particular disease but the offspring may have a higher risk of exhibiting symptoms and may develop at an earlier age.
Fragile X syndrome, Huntington disease, myotonic dystrophy, and Machado-Joseph disease are examples of trinucleotide repeat disorders.
Also called:

  • trinucleotide repeat expansion disorder
  • triplet repeat expansion disorder
  • codon reiteration disorder

See also:

  • extranuclear inheritance
  • gene conversion
  • infectious heredity
  • genomic imprinting
  • mosaicism
  • maternal inheritance
  • mitochondrial disease
  • non-Mendelian inheritance
  • genotype


  • You will also like...

    running freshwater community
    Running Water Freshwater Community Factors

    This tutorial noted some of the physical and chemical factors that provide the framework of a running water community in..

    Water Cycle
    The Water Cycle

    The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..

    Pink Lotus plant on a pond
    Freshwater Lentic Communities & Animals

    This tutorial looks at some of the communities in freshwater lentic habitats. For instance, symbiosis occurs in a commun..

    Selective Breeding
    Selective Breeding

    Gregor Mendel's studies into Monohybrid and Dihybrid crossing and Charles Darwin's study of evolution and natural select..

    Homeostatic Mechanisms and Cellular Communication
    Homeostatic Mechanisms and Cellular Communication

    Homeostasis is the relatively stable conditions of the internal environment that result from compensatory regulatory res..

    Endemic Flora of New Zealand
    New Zealand’s Unique Flora

    If New Zealand has lots of unique animals, it's also got a whole lot of unique plants. Find out more about some of them,..

    Related Articles...

    No related articles found

    See all Related Topics