Chemical modification of siRNA
Elena L Chernolovskaya1, Marina A Zenkova
1Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences, Lavrentiev Avenue 8, Novosibirsk, 630090, Russian Federation. elena_ch@niboch.nsc.ru
Current Opinion in Molecular Therapeutics
|April 8, 2010
Summary
Chemically modified small interfering RNAs (siRNAs) enhance gene silencing efficacy and stability. Modifications address challenges like nuclease degradation and off-target effects, improving therapeutic potential.
Area of Science:
- Molecular Biology
- Pharmacology
- Biochemistry
Background:
- Small interfering RNAs (siRNAs) are potent gene expression inhibitors used in research and drug development.
- Current limitations include poor nuclease stability, off-target effects, and inefficient delivery, hindering clinical applications.
- Chemical modifications offer a promising strategy to overcome these siRNA-related challenges.
Purpose of the Study:
- To review recent advancements in chemically modified siRNAs for enhanced gene silencing.
- To explore the relationship between chemical modifications, siRNA stability, and gene silencing potency.
- To discuss how modifications impact nuclease resistance and the duration of silencing effects.
Main Methods:
- Review of existing scientific literature on chemically modified siRNAs.
- Analysis of data correlating thermal stability, nuclease resistance, and gene silencing potency.
- Examination of modifications aimed at improving sequence specificity and delivery efficiency.
Main Results:
- Chemical modifications significantly improve siRNA stability and resistance to nucleases.
- Enhanced thermal stability often correlates with increased gene silencing potency.
- Modified siRNAs demonstrate prolonged silencing effects compared to unmodified counterparts.
Conclusions:
- Chemical modification is a key strategy for developing effective siRNA therapeutics.
- Optimized modifications can enhance potency, stability, and duration of gene silencing.
- Further research into modified siRNAs holds significant promise for biomedical applications.
Related Concept Videos
02:30siRNA - Small Interfering RNAs
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
01:23RNA Interference
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
02:15Experimental RNAi
RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
02:23RNA Editing
RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
02:36Transfer RNA Synthesis
One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
02:30Small interfering RNAs (siRNA)
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...