Related Experiment Video
Updated: May 5, 2026
03:55
Author Spotlight: FISH as a Tool for Precise Gene Amplification Assessment in Cancer Specimens
Published on: July 12, 2024
2.2K
Alu mobile elements: from junk DNA to genomic gems
1Nutrition Research Institute, The University of North Carolina at Chapel Hill, 500 Laureate Way, Kannapolis, NC 28081, USA.
Scientifica
|November 27, 2013
Summary
Short interspersed repeated sequences (SINEs), known as Alus, are not junk DNA. These mobile elements have crucial biological functions, including regulating gene expression and contributing to human genetic diseases and evolution.
Area of Science:
- Genomics
- Molecular Biology
- Bioinformatics
Background:
- Short interspersed repeated sequences (SINEs), specifically Alu elements, are abundant retrotransposons in the human genome.
- Historically, Alus were dismissed as non-functional "junk DNA" due to their repetitive nature.
Purpose of the Study:
- To investigate the biological significance and functional roles of Alu elements and their transcripts.
- To challenge the prevailing notion of Alus as mere genomic junk.
Main Methods:
- Analysis of RNA polymerase III and RNA polymerase II transcripts originating from Alu elements.
- Examination of Alu RNA's influence on mRNA processing, gene regulation, and disease mechanisms.
Main Results:
- Alu elements are transcribed into functional RNAs by both RNA polymerase III and RNA polymerase II.
- Alu RNAs play roles in modulating mRNA processing, regulating transcription, and alternative splicing.
- Alu RNAs are implicated in various human genetic diseases.
- Alu RNAs within Pol II transcripts contribute to evolution and proteome diversity.
Conclusions:
- Alu elements possess significant biological functions, refuting their classification as junk DNA.
- Alu RNAs are key regulators in cellular processes and contribute to genomic evolution.
- Alus represent valuable "genomic gems" rather than "genomic junks" due to their multifaceted roles.
Related Concept Videos
02:57DNA-only Transposons
16.0K
DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
The donor site from where the transposon is excised is either degraded or...
The donor site from where the transposon is excised is either degraded or...
16.0K
01:20Genetic Material
4.1K
Within the human body, a complex and detailed system of trillions of cells works in unison to sustain life. Each cell houses a nucleus, which contains 46 chromosomes divided into 23 pairs. Chromosomes are highly coiled structures made of the genetic material DNA. These chromosomes are essential carriers of genetic information, with half inherited from the mother through her egg and the other half from the father's sperm, combining to create the unique genetic makeup of an individual.
4.1K
03:21Genome Size and the Evolution of New Genes
2.5K
2.5K
03:21Genome Size and the Evolution of New Genes
7.6K
While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
7.6K
01:08Evolution of Microbial Genome
116
Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.
116
03:06From DNA to Protein
20.9K
The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
20.9K