What are some characteristics of a pseudogene?

Name: Problem 6, Chapter 21: Biological Science
Uploaded: 2020-07-03T01:19:31-08:00
Duration: 1 min 25 s
Channel: Evey Z
Description: What are some characteristics of a pseudogene?

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Key Concepts

Pseudogene

A pseudogene is a segment of DNA that resembles a functional gene but has lost its ability to code for a protein due to mutations or the absence of necessary regulatory sequences. They typically exhibit signs of deterioration such as frameshifts, premature stop codons, or deletions that prevent proper expression.

Gene Duplication

Many pseudogenes arise from gene duplication events where one copy accumulates mutations over time, rendering it nonfunctional. This process illustrates how redundancy in the genome can lead to the generation of nonfunctional sequences.

Retrotransposition

Another route for pseudogene formation is retrotransposition, in which an mRNA transcript is reverse-transcribed and inserted back into the genome. These sequences often lack introns and the regulatory elements necessary for proper gene expression.

Neutral Mutation Accumulation

Because pseudogenes are generally nonfunctional, they are not subject to the same selective pressures as functional genes. This allows them to accumulate mutations neutrally over time, providing insights into molecular evolution and the history of genomic changes.

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