Guide Rnas
Guide Rnas - Related Videos
02:30
siRNA - Small Interfering RNAs
0 Views •
2020
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...
02:39
lncRNA - Long Non-coding RNAs
0 Views •
2020
In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA (lncRNA)...
06:44
Isolation of Small Noncoding RNAs from Human Serum
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Cited by 13 •
2014
This protocol describes a method for extracting small RNAs from human serum. We have used this method to isolate microRNAs from cancer serum for use in DNA arrays and also singleplex quantitative PCR. The protocol utilizes phenol and guanidinium thiocyanate reagents with modifications to yield high quality RNA.
02:57
piRNA - Piwi-interacting RNAs
0 Views •
2020
PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
02:30
Small interfering RNAs (siRNA)
0 Views •
2023
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...
FAQs
The guide RNA contains a sequence that can pair with a matching DNA or RNA region through complementary bases. This pairing provides the recognition step that positions the associated Cas protein at the selected target rather than directing it randomly. Consequently, the guide sequence is central to selective targeting and determines which genetic information the complex can engage.
Guide-RNA recognition identifies the nucleic-acid location, but the Cas protein determines the resulting molecular action. Depending on the CRISPR system, the protein may cut the target, bind to it, or otherwise alter the DNA or RNA. This distinction allows related guide-RNA targeting principles to support different experimental goals, including modification, regulation, or molecular detection.
Guide-RNA design influences both how selectively a complex recognizes its intended sequence and how effectively it performs the associated task. A suitable guide must provide the sequence information needed for matching while supporting the desired Cas-protein activity. Researchers therefore treat guide design as an important experimental variable when planning genome editing, gene regulation, or RNA-manipulation studies.
The same targeting principle can be applied to different nucleic-acid substrates. In one system, complementary pairing positions the Cas protein at a DNA sequence; in another, it directs recognition of an RNA sequence. The substrate matters because the chosen system determines whether the experiment addresses genomic information or RNA molecules and what type of alteration or analysis is possible.
A basic workflow begins by identifying the DNA or RNA sequence relevant to the experiment, then selecting a guide RNA with complementary sequence information. The guide is combined with the appropriate Cas protein so the complex can recognize the target. Researchers next use the system according to the intended outcome, such as cutting, binding, altering, or detecting the nucleic acid.
Guide RNAs are useful when researchers need targeted access to genetic information rather than nonspecific nucleic-acid activity. Their applications include genome editing, gene regulation, RNA manipulation, and molecular diagnostics. In biology, these systems also help investigate gene function, while biotechnology and biomedical research use the targeting principle to develop experimental tools and study sequence-specific molecular processes.