Dictionary > Interspersed repeat

Interspersed repeat

Definition
noun, plural: interspersed repeats
A type of repeated sequence in which the copies are dispersed throughout the genome and not side by side
Supplement
The repeated sequences occur as multiple copies of nucleic acids in the genome. These repeats may involve the DNA or the RNA. There are three major types of repeated sequences: (1) terminal repeats, (2) tandem repeats, and (3) interspersed repeats.
Interspersed repeats are repeated sequence wherein the copies are interspersed, i.e. dispersed throughout the genome. This makes it different from the tandem repeats wherein the copies lie side by side. In the interspersed repeats, the copies are nonadjacent.
Interspersed repeats are present in all the genomes of the eukaryotes. Transposable elements (transposons), such as DNA transposons and retrotransposons, are interspersed repeats.
One possible importance of interspersed repeats is to allow new genes to evolve by uncoupling the gene conversion network. For instance, the Alu elements are specialized for uncoupling intrachromosomal gene. Another example is the long interspersed nuclear elements (LINEs) specialized for uncoupling interchromosomal gene conversion. These repeats are therefore essential in promoting evolution and the development of new species.
See also:

  • repeated sequence
  • transposable element
  • DNA transposon
  • retrotransposon
  • Alu element
  • long interspersed nuclear element


You will also like...

Gibberellins and Gibberellic Acid
Gibberellins and Gibberellic Acid

This tutorial describes the role of gibberellin family in plants. Find out the effects of gibberellin on plant growth an..

Freshwater aquatic plankton
Freshwater Communities & Plankton

Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..

Control of body movement
Control of Body Movement

Some of the body movements can be controlled at will, others cannot. The body has a motor program, which is the pattern ..

Salmon jumping upstream in the river
Lotic Communities & Animals

A running water environment offers numerous microhabitats for many types of animals. Similar to plants, animals in lotic..

An artist's depiction of the origin of amphibians
Amphibians & Early Reptiles

Obtaining air outside an aquatic environment required species to acquire suitable adaptations, and this was the case of ..

Lotic community of algal species
Lotic Communities & Algae

Lotic communities have conditions that are rather harsh for typical plants. Thus, the diversity of plant species in loti..