Name: ribosome profiling for translation snapshot
Uploaded: 2021-04-07T12:12:00.000Z
Duration: 2 min 24 s
Channel: JoVE

K12 Standards

north-carolina-k-12-science-standard-course-of-study

NC K-12 Science Standard Course of Study

9-12

Biology

heredity-inheritance-and-variation-of-traits

Heredity- Inheritance and Variation of Traits

LS.Bio.8.2

Ribosome Profiling

Bir genomda kopyalanan ve proteinlere çevrilen bölgelerin tanımlanması, bir genomu ve ekspresyonunu anlamada hayati bir adımdır.
Bu, ribozom profillemesi adı verilen ve aynı zamanda ribo-seq olarak da adlandırılan bir teknikle elde edilir. Ribozomların mRNA üzerindeki konumlarını haritalandırır ve aktif olarak proteinlere çevrilen mRNA'ları tanımlar.
RNA'yı izole etmek için, hücrelerin önce içlerindeki moleküllere erişmek için parçalanması gerekir. Lizat daha sonra RNazlar ile muamele edilir. Bu enzimler, ribozomlarla kaplı olmayan mRNA'ları parçalayarak geriye sadece korunan mRNA fragmanları kalır.
Ribozom korumalı fragmanlar daha sonra bir sakaroz gradyanı kullanılarak korumasız, parçalanmış fragmanlardan ayrılır.
Ribozomlar daha sonra mRNA fragmanlarından çıkarılır ve RNA, ters transkriptaz enzimi kullanılarak RT-PCR ile DNA'ya dönüştürülür.
Daha sonra, DNA dizilenir ve referans genom üzerinde haritalanır. Bu, her mRNA boyunca ribozomun tam yerini belirler.
Ribozom profili oluşturma, tanınmayan açık okuma çerçevelerini veya ORF'leri tanımlamaya da yardımcı olabilir. Bir ORF, proteine çevrilebilen bir başlangıç kodonu ile bir durdurma kodonu arasındaki bir DNA bölgesidir. ORF'lerin bulunması, yeni genlerin tanımlanmasında yardımcı olabilir.
Bir memeli hücre hattındaki gen ekspresyon modellerinin incelenmesini düşünün. Deneysel prosedür, hücrelerin gen ekspresyonunu açabilecek ve mRNA sentezini başlatabilecek uyaranlara maruz bırakılmasını içerir.
Aktif olarak çevrilen mRNA'lar, ribozom profillemesi kullanılarak tanımlanır.
Bu deney, B geninin translasyona uğradığını, A ve C genlerinin ise translasyona tabi olmadığını ortaya koymaktadır.
Ayrıca, genomun yaklaşık yüz nükleotid uzunluğundaki ek küçük bir bölgesinin aktif olarak çevrildiğini gösteriyor.
Bu tanınmayan bölge, deneysel uyaranlar tarafından yukarı regüle edilen yeni bir proteini kodlayabilen açık bir okuma çerçevesidir.

<ol>
	<li>Brar, G., Weissman, J. Ribozom profillemesi, protein sentezinin ne, ne zaman, nerede ve nasıl olduğunu ortaya koymaktadır. Nat Rev Mol Hücre Biol 16, 651–664 (2015). https://doi.org/10.1038/nrm4069</li>
	<li>Chung BY, Hardcastle TJ, Jones JD ve diğerleri. Ribozom profillemesinde duplekse özgü nükleaz kullanımı ve Ribo-seq veri analizi için kullanıcı dostu bir yazılım paketi. RNA. 2015; 21(10):1731-1745. doi:10.1261/rna.052548.115</li>
</ol>

ribozom profiling

Ribozom profiling veya ribo dizileme, bir hücredeki aktif translasyonun anlık görüntüsünü üreten derin bir dizileme tekniğidir. Herhangi bir zamanda bir hücrenin translasyon ortamına dair bir fikir edinmek için ribozomlar tarafından korunan mRNA'lar seçici olarak sıralanır. <h4>Ribozom profiling uygulamaları</h4> Ribozom profilingin, belirli bir organ veya doku türü içindeki translasyonun in vivo izlenmesi ve yeni protein sentezi seviyelerinin ölçülmesi dahil olmak üzere birçok uygulaması vardır. Teknik, translasyon geçirmiş açık okuma çerçevelerinin tanımlanmasına ve kısa peptitler ve bilinmeyen işlevlere sahip karakterize edilmiş proteinlerin izoformları dahil olmak üzere yeni translasyon geçirmiş ürünlerin keşfedilmesine yardımcı olur. Ribozom profiling, hücrede harici bir sinyal alana kadar translasyon geçirmeyen birkaç mRNA'nın tanımlanmasına da yardımcı olur. <h4>Ribozom Profiling'in teknik zorlukları</h4> Ribozom profiling, büyük miktarlarda numune gerekliliği, translasyonun zamanında inhibe edilmesine ilişkin güvenilirlik ve RNA kontaminasyonu gibi birçok teknik zorlukla karşı karşıyadır. Flash-freezing tekniği, hızlı translasyon inhibisyonunun zorluğunun üstesinden gelebilir. Sikloheksimid gibi translasyon uzaması inhibitörleriyle karşılaştırıldığında hücreler içindeki ribozom dağılımının verimli bir şekilde yakalanmasına yardımcı olur. MRNA'ya bağlanan ribozomal RNA (rRNA), genellikle ribozom profiling sırasında çıkarılır. Ancak bazen birkaç rRNA kontaminasyonu hala gözlenmektedir. Araştırmacılar, Kamçatka yengecinin hepatopankreasından izole edilen ve dsDNA ve DNA-RNA hibritlerini parçalayan rRNA kontaminasyonunu azaltmak için dubleks spesifik nükleaz (DSN) enzimini kullanıyor. Bu yöntem sıklıkla yeni nesil dizileme ve rRNA'nın RNA-seq kütüphanelerinden tükenmesinden önce cDNA kütüphaneleri normalizasyonu için de kullanılır. Ribozom profilingin bir diğer sınırlı noktası, biyoenformatikte doğru uzmanlığı gerektiren verilerin analizidir. Bu sorunun üstesinden gelmek için birden fazla numune için ribozomal profiling verilerinin çözülmesine yönelik yöntemler sağlayan bir R paketi riboSeqR kullanılır.

Ribozom Profiling

Ribozom profili oluşturma veya ribo dizileme, bir hücredeki aktif translasyonun anlık görüntüsünü üreten derin bir dizileme tekniğidir. Seçici olarak sıralar ...

Education

JoVE Core

Molecular Biology

Moleküler Biyoloji

Unit 2

Ünite 2

Analyzing Gene Expression and Function

Gen İfadesinin ve İşlevinin Analizi

KEY TERMS AND CONCEPTS

TEMEL TERİMLER VE KAVRAMLAR

ribosome profiling for translation snapshot

Ribosome profiling is a deep sequencing method that gives a snapshot of active translation in a cell. It sequences the mRNAs protected by ribosomes. This shows which messages are being read to make proteins at a specific moment.

The method has several uses in biology. It can track translation in a living organ or tissue type. It also helps measure new protein synthesis levels. Researchers use it to find translated open reading frames, which are stretches of RNA that can make protein. It can also reveal short peptides, protein isoforms with unknown functions, and mRNAs that stay untranslated until a cell receives an external signal.

Ribosome profiling also has technical limits. It often needs a large sample amount. It depends on stopping translation at the right time, and RNA contamination can be a problem. Flash-freezing can help block translation quickly and capture ribosome positions more accurately than elongation inhibitors such as cycloheximide.

Another challenge is ribosomal RNA, or rRNA, contamination. rRNA is usually removed during the procedure, but some contaminants can remain. Researchers may use duplex-specific nuclease, or DSN, from the hepatopancreas of the Kamchatka crab to reduce this problem. DSN cleaves dsDNA and DNA-RNA hybrids. It is also used to normalize cDNA libraries before next-generation sequencing and to remove rRNA from RNA-seq libraries.

Data analysis can also be difficult because it requires bioinformatics expertise. The R package riboSeqR helps address this issue. It provides methods for analyzing ribosome profiling data from multiple samples.

Ribosome Profiling for Translation Snapshot

ribosome-profiling-for-translation-snapshot

in vitro mutagenesis

In Vitro Mutagenesis for Gene Analysis

In vitro mutagenesis is a lab method used to change DNA and study gene function. It helps scientists test how specific DNA changes affect a gene’s activity and the traits it controls. A common approach is to make a known change in a DNA sequence and then examine the result. This can be done by deleting, inserting, or altering selected bases in a gene. The method is useful for linking a DNA change to a biological effect. Researchers use in vitro mutagenesis in molecular biology, genetics, and...

genetic screens

Using Genetic Screens to Find Disease Genes

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test cross

Test Cross in Genetic Inheritance

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complementation tests

Using Crosses to Group Mutations

A complementation test uses a simple cross to find out whether two mutations are in the same gene or in different genes. It helps show how mutations are arranged on chromosomes. Edward Lewis first performed this test in the 1940s while studying fruit flies. To do the test, organisms heterozygous for different mutations are crossed pairwise in all combinations. If the mutations are in different genes, they can complement each other. In that case, each mutation provides the missing genetic...

single nucleotide polymorphisms-snps

SNPs as Genetic Markers and Variants

Single nucleotide polymorphisms, or SNPs, are small DNA changes at one specific genomic position. They are the most common type of sequence variation in the human genome. A point mutation counts as an SNP when it appears in more than 1% of the population.

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Bacterial Transformation in the Lab

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transgenic organisms

Making Transgenic Organisms

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reproductive cloning

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crispr

CRISPR Gene Editing Basics

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experimental rnai

RNAi for Gene Silencing and Discovery

RNA interference (RNAi) is a gene-silencing process used to reduce gene expression. It can block transcription or trigger RNA degradation. Scientists first discovered this mechanism in plants in 1998 through Andrew Fire and Craig Mello. RNAi has since been found in many eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. Researchers use it as a practical tool to study gene function. It can show what a gene does without permanently changing the organism’s DNA. <br...

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in-situ hybridization

ISH Probes for DNA and RNA Detection

In situ hybridization (ISH) uses labeled probes to detect and localize specific DNA or RNA molecules in cells, tissues, or tissue sections. The probe is a complementary strand of DNA or RNA that binds to a matching nucleotide sequence in the sample. Since its first use in 1969 for nucleic acid studies, ISH has become an important tool in research and in clinical diagnosis. Several probe types can be used in ISH. These include single-stranded DNA probes, double-stranded DNA probes, antisense...

chromatin immunoprecipitation- chip

ChIP Methods for DNA-Protein Binding

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synthetic biology

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ribosome profiling

Ribosome profiling is a deep sequencing method that gives a snapshot of active translation in a cell. It sequences the mRNAs protected by ribosomes. This shows which messages are being read to make proteins at a specific moment. The method has several uses in biology. It can track translation in a living organ or tissue type. It also helps measure new protein synthesis levels. Researchers use it to find translated open reading frames, which are stretches of RNA that can make protein. It can...

transgenic plants

Transgenic Plants for Better Crops

Transgenic plants are crops that have been changed with recombinant DNA technology, also called transgenesis. This method adds a foreign gene or removes a harmful one from an organism. The result is a genetically modified organism. The first transgenic plant was a tobacco plant made in 1983, and it was resistant to tobacco mosaic virus. Since then, transgenic plants have been developed for many uses in agriculture, horticulture, and ornamental plants. Some are designed to resist pests or...

gene therapy

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epistasis analysis

Gene Interaction Maps in Epistasis

Gene interaction maps in epistasis show how different genes work together to shape a phenotype. In epistasis, the interaction of genes or alleles at different locations affects the final trait. This often happens when one gene masks or interferes with the expression of another gene. Epistasis is common when genes are part of the same biochemical pathway. In that case, the expression of one gene can depend on a gene product made earlier in the pathway. Genes that mask or inhibit other genes in...

genome-wide association studies-gwas

Using SNP Patterns to Link Disease Risk

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key terms and concepts

Learn how ribosome profiling captures active translation, finds translated RNA regions, and handles challenges like rRNA contamination and data analysis.

Ribosome Profiling for Translation Snapshot | JoVE K12

molecular biology

JoVE Core Moleküler Biyoloji, hücrenin moleküler süreçlerini açık ve özlü animasyonlu video dersleriyle sergiler. Buna ek olarak, bilim insanı-eylem videolarında, bu kavramların uygulaması modern laboratuvarlarda gerçek deneylerle gösterilmektedir.

Tennessee Academic Standards

High School

links-among-engineering-technology-science-and-society

Links Among Engineering, Technology, Science, and Society

BIO1.ETS2.1

BIO1.ETS2.3

Virginia  Standards of Learning

HIgh School

BIO.5

BIO.5.e

Alabama Course of Study Science

from-molecules-to-organisms-structures-and-processes

From Molecules to Organisms: Structures and Processes

9-12.B.1.2.c

What is Meiosis?

Meiosis is the process by which diploid cells divide to produce haploid daughter cells. In humans, each diploid cell contains 46 chromosomes, half from ...

Meiosis I

Meiosis II

Meiosis vs. Mitosis

Crossing Over

Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to ...

Nondisjunction

Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This ...

Spermatogenesis

Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of ...

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from ...

Fertilization

During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ...

Cleavage and Blastulation

After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage ...

Gastrulation

Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of ...

Neurulation

Neurulation is the embryological process which forms the precursors of the central nervous system and occurs after gastrulation has established the three ...

Cell Migration

Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms ...

Determination

During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. ...

Use models to explain how DNA is passed from parents to offspring through the processes of meiosis and fertilization in sexual reproduction.

LS.Bio.6.1

Mutations

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genome-size-and-the-evolution-of-new-genes

Genome Size and the Evolution of New Genes

types-of-genetic-transfer-between-organisms

Types of Genetic Transfer Between Organisms

Base-pairing and DNA Repair

The DNA Replication Fork

Lagging Strand Synthesis

The Replisome

Proofreading

Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template ...

Replication in Prokaryotes

DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the ...

Replication in Eukaryotes

In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before ...

Overview of DNA Repair

Base Excision Repair

Nucleotide Excision Repair

DNA Distortion and Damage
Cells are regularly exposed to mutagens&#8212;factors in the environment that can damage DNA and generate mutations. UV ...

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the ...

Fixing Double-strand Breaks

Homologous Recombination

Gene Conversion

Restarting Stalled Replication Forks

Construct an explanation to summarize how inheritable genetic variations may result from: new genetic combinations in meiosis, mutations during replication, or mutations caused by environmental factors.

LS.Bio.6.2

An Overview of Genetic Analysis

An organism&#8217;s physical traits, or phenotype, are a product of its genotype, which is the combination of alleles (gene variants) inherited from its ...

Genetic Crosses

To dissect genetic processes or create organisms with novel suites of traits, scientists can perform genetic crosses, or the purposeful mating of two ...

Punnett Squares

Monohybrid Crosses

Dihybrid Crosses

Trihybrid Crosses

Trihybrid Crosses
Some of Mendel&#8217;s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A ...

Law of Independent Assortment

Chi-square Analysis

The chi-square test is a statistical hypothesis test. It is used to check whether there is a significant difference between an expected value and an ...

Pedigree Analysis

Multiple Allele Traits

Incomplete Dominance

Gregor Mendel&#39;s work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid ...

Lethal Alleles

Agouti: A Lethal Allele
Lucien Cu&#233;not discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is ...

Polygenic Traits

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Background and Environment Affect Phenotype

Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as ...

Use mathematics and computational thinking to predict the variation and distribution of expressed traits based on: Mendelian inheritance, co-dominance, incomplete dominance, multiple alleles, and sex-linked inheritance.

LS.Bio.7.1

Overview

A pedigree is a diagram displaying a family&#x2019;s history of a trait. Analyzing pedigrees can reveal (1) whether a trait is dominant or ...

Probability Laws

Overview

The probability of inheriting a trait can be calculated using the sum and product rules. The sum rule is used to calculate the probability of ...

The Concept of Multiple Allelism

Multiple allelism describes genes that exist in three or more allelic forms. Although diploid organisms, like humans, ...

Analyze and interpret data to explain how polygenic traits result in a wide range of phenotypes.

LS.Bio.7.2

Pleiotropy

Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause ...

Nature and Nurture

Many human characteristics, like height, are shaped by both nature&mdash;in other words, by our genes&mdash;and by nurture, or our environment. For ...

Construct an explanation to summarize how traits result from interactions of genetic factors (multiple genes and/or alleles) and environmental factors.

LS.Bio.7.3

PCR: The Polymerase Chain Reaction

The polymerase chain reaction, or PCR, is a technique used to amplify DNA through thermocycling &#8211; cyles of temperature changes at fixed time ...

DNA Gel Electrophoresis

DNA gel electrophoresis is a technique used for the detection and separation of DNA molecules. An electric field is applied to a gel matrix comprised of ...

DNA Isolation

DNA isolation protocols can be fast and straightforward or complex and time-consuming depending on the type and quality of DNA required for further ...

Analyze and interpret data to compare DNA samples.

LS.Bio.8.1

Understand genetic mechanisms for variation.

Ribosome Profiling for Translation Snapshot

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