It is estimated that about 0.2 percent of human mutations...

Name: Problem 20, Chapter 14: Essentials of Genetics
Uploaded: 2020-06-30T21:15:30-08:00
Duration: 1 min 4 s
Channel: Courtney Burson
Description: It is estimated that about 0.2 percent of human mutations are due to TE insertions, and a much higher degree of mutational damage is known to occur in some other organisms. In what way might a TE insertion contribute positively to evolution?

It is estimated that about 0.2 percent of human mutations are due to TE insertions, and a much higher degree of mutational damage is known to occur in some other organisms. In what way might a TE insertion contribute positively to evolution?

Key Concepts

Transposable Elements (TEs)

Transposable elements are DNA sequences that can change their position within the genome. They are significant in genetics because they can cause mutations and genomic rearrangements by inserting into new locations, providing the raw material for evolutionary change despite often being considered 'selfish' genetic material.

Mutation

Mutations are alterations in the genetic sequence that can have various effects. While many mutations caused by TE insertions can be detrimental or neutral, they occasionally generate beneficial changes by, for example, creating new gene variants or altering gene regulatory networks, thereby contributing to the genetic diversity essential for evolution.

Exaptation

Exaptation refers to a process where genetic elements originally evolved for one purpose acquire a new, beneficial function. In the context of TE insertions, these mobile elements can be co-opted by the organism to serve functions such as regulatory roles, helping create novel gene expression patterns that may lead to advantageous traits.

Regulatory Innovation

TE insertions can introduce new regulatory sequences that affect the timing, location, or level of gene expression. This insertion-driven regulatory modification can lead to the development of novel traits or improved adaptation by rewiring gene networks, highlighting a positive contribution to the evolutionary process.

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