Ribosome Profiling
Ribosome Profiling - Related Videos
02:24
Ribosome Profiling
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2021
Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time. Applications of ribosome profiling Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels. The technique helps...
02:53
Ribosomal RNA Synthesis
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2020
Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells. Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
06:58
Global Identification of Co-Translational Interaction Networks by Selective Ribosome Profiling
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Cited by 1 •
2021
Co-translational interactions play a crucial role in nascent-chain modifications, targeting, folding, and assembly pathways. Here, we describe Selective Ribosome Profiling, a method for in vivo, direct analysis of these interactions in the model eukaryote Saccharomyces cerevisiae.
12:57
Genome-wide Quantification of Translation in Budding Yeast by Ribosome Profiling
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Cited by 7 •
2017
Translational regulation plays an important role in the control of protein abundance. Here, we describe a high-throughput method for quantitative analysis of translation in the budding yeast Saccharomyces cerevisiae.
01:27
Ribosomes
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2026
Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.Ribosome Structure and AssemblyRibosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome production. Within the...
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Selective nuclease digestion is central because ribosomes shield the RNA segments within their complexes, whereas unprotected RNA is removed. The remaining short fragments preserve the transcript locations occupied by ribosomes at the time of isolation. Converting these protected pieces into a sequencing library allows their positions to be compared across transcripts and mapped back to the transcriptome.
Ribosome occupancy and translation rate are inferred from the distribution and abundance of mapped footprints. Dense or repeated protection at a region can indicate greater ribosome presence, while codon-level pauses appear as localized patterns in the footprint data. These measurements connect sequencing reads with translational regulation and show how protein production changes across messages or cellular conditions.
One important analytical outcome is the detection of previously unrecognized open reading frames, or ORFs. Because the reads mark where ribosomes occupy messenger RNAs, their patterns can reveal translation in regions not represented by the expected coding annotation. This extends analysis beyond known protein-coding messages and helps connect genome annotation with actual evidence of protein synthesis.
Comparing footprint patterns between conditions can expose changes in translational regulation rather than only changes in the messages present. The relevant signals include altered ribosome occupancy, translation rates, and pausing at codons. In biology, this comparison is useful for examining how cells adjust protein production when environmental or cellular conditions change, while retaining transcript-level positional information.
A basic workflow begins by isolating ribosome-mRNA complexes, digesting RNA that is not protected by the ribosome, and retaining the resulting short protected fragments. Those fragments are then converted into a sequencing library and mapped to the transcriptome. Each stage contributes a different kind of information: isolation preserves complexes, digestion enriches footprints, and mapping assigns them to transcript positions.
Mapping is not merely a way to count sequencing reads; it places each protected fragment in transcript context. The resulting footprint patterns can be examined for which messenger RNAs are translated, how many ribosomes occupy regions, how rapidly translation proceeds, and where codon-level pauses occur. This positional resolution also supports searches for unrecognized ORFs.
Within biology, ribosome profiling is especially useful when the question concerns the connection between gene expression and protein production. It can support studies of translational regulation, responses to changing cellular conditions, and genome-wide differences in ribosome behavior among messages. By measuring translation-related footprints alongside transcriptome mapping, the method provides direct evidence about protein synthesis.