Related Experiment Video
Updated: May 24, 2025
09:13
Using Reverse Genetics to Manipulate the NSs Gene of the Rift Valley Fever Virus MP-12 Strain to Improve Vaccine Safety and Efficacy
Published on: November 1, 2011
17.3K
Multifunctional noncoding regions in the mammarenavirus genome
1Laboratory of Emerging Viral Diseases, International Research Center for Infectious Diseases, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka, Japan; Center for Infectious Disease Education and Research, Osaka University, Suita, Osaka, Japan; Center for Advanced Modalities and Drug Delivery System, Osaka University, Suita, Osaka, Japan; RNA Frontier Science Division, Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Suita, Osaka, Japan.
Virology
|March 1, 2025
Summary
Mammarenaviruses, including human pathogens, utilize complex RNA genomes with multifunctional noncoding regions. Understanding these regions, like the intergenic region (IGR), is key to controlling viral spread and developing new treatments.
Area of Science:
- Virology
- Molecular Biology
- Genetics
Background:
- Mammarenaviruses are rodent-borne viruses causing asymptomatic chronic infections and severe human diseases.
- Their bisegmented RNA genome features ambisense polarity, with multifunctional gene products essential for viral propagation.
- Noncoding genomic regions, particularly the intergenic region (IGR), play crucial roles beyond basic transcription and replication control.
Purpose of the Study:
- To elucidate the multifaceted roles of noncoding regions in mammarenavirus biology.
- To investigate the function of the intergenic region (IGR) in posttranscriptional regulation of viral protein expression.
- To provide a foundation for developing novel medical countermeasures against mammarenavirus infections.
Main Methods:
- Analysis of mammarenaviral genome structure and gene expression.
- Investigation of noncoding regions, specifically the intergenic region (IGR).
- Studies on viral transcription, replication, and protein expression regulation.
Main Results:
- Mammarenaviral noncoding regions exhibit multifunctionality, impacting viral propagation.
- The intergenic region (IGR) is critical for posttranscriptional regulation of viral protein expression.
- This regulatory mechanism contributes to the efficient multiplication of viruses using ambisense coding strategies.
Conclusions:
- The multifunctionality of mammarenaviral noncoding regions is integral to viral biology.
- Further research into these regions, especially the IGR, enhances understanding of viral mechanisms.
- Elucidating these functions will facilitate the development of targeted antiviral therapies and countermeasures.
Related Concept Videos
02:28Leaky Scanning
5.1K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.1K
03:18Non-LTR Retrotransposons
11.3K
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...
11.3K
02:33Retroviruses
12.2K
Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
12.2K
02:51Multi-species Conserved Sequences
3.9K
Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale studies have provided new insights into the evolutionary relationship between organisms.
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved...
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved...
3.9K
02:02Cis-regulatory Sequences
9.7K
Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
9.7K
01:10Retrovirus Life Cycles
45.5K
Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...
45.5K