Alu elements as an aid in deciphering genome rearrangements
Gene
|February 14, 1998
Summary
Alu repetitive elements are useful for tracing genome duplication histories. Computer analyses of these elements, like those at the human growth hormone locus, reveal insights into genome rearrangements.
Area of Science:
- Genomics
- Molecular Biology
- Bioinformatics
Background:
- Genomic rearrangements, such as duplications, contribute to the complexity of genomes.
- Alu elements, abundant in primate genomes, have been explored for tracing locus duplication histories.
Purpose of the Study:
- To demonstrate the utility of Alu repetitive elements in computer sequence analyses for tracing duplication histories.
- To use the human growth hormone locus as an example to illustrate this methodology.
Main Methods:
- Utilizing Alu repetitive elements for computer sequence analysis.
- Examining subfamily classification, direction, arrangements, Poly(A) tails, and direct repeats of Alu elements.
Main Results:
- Alu elements provide valuable data for understanding genome rearrangements.
- The analysis of the human growth hormone locus exemplifies the effectiveness of this approach.
Conclusions:
- Alu repetitive elements are powerful tools for investigating genome duplication events.
- Detailed analysis of Alu element characteristics aids in comprehending genome rearrangement processes.
Related Concept Videos
Overview of Transposition and Recombination
Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
Non-LTR Retrotransposons
As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
Conservative Site-specific Recombination and Phase Variation
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
Evolutionary Relationships through Genome Comparisons
Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
Synteny and Evolution
John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral chromosome underwent...
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral chromosome underwent...
Genome Annotation and Assembly
The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.


