Name: snps as genetic markers and variants
Uploaded: 2021-04-07T12:12:00.000Z
Duration: 1 min 5 s
Channel: JoVE
Description: 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.

K12 Standards

Arizona Science Standards

High School

Life Science

HS.L3

HS.L3U3.26

Single Nucleotide Polymorphisms-SNPs

عند مقارنة جينومات بشرية متعددة ، لوحظت اختلافات في التسلسلات.
تسمى الاختلافات الناتجة عن استبدال نيوكليوتيدات واحدة تعدد أشكال النوكليوتيدات المفردة ، أو تعدد الأشكال
تسمى الاختلافات الناتجة عن إدخال أو حذف سلسلة من النيوكليوتيدات التي يقل طولها عن كيلو قاعدة واحدة ب indel.
إذا تم نسخ إدخال أو حذف النيوكليوتيدات لعدد متغير من المرات في نفس الجينوم ، تسميته باختلاف رقم النسخ أو CNV. في كثير من الأحيان ، تتضمن CNVs امتدادات كبيرة من الحمض النووي يزيد طولها عن كيلو قاعدة.
النمط الفرداني هو مجموعة من الجينات الموروثة من والد واحد. يمكن تقسيم الجينوم إلى كتل النمط الفرداني التي تحتوي على مجموعات من تعدد الأشكال.
نظرا لحدوث عدد قليل من عمليات الانتقال بين الكروموسومات المتجانسة أثناء كل انقسام اختزالي ، فقد تم توريث كتل النمط الفرداني في مجموعة مرتبطة عبر الأجيال.

<ol>
	<li>شانوك ، ستيفن. "الجينات المرشحة وتعدد أشكال النوكليوتيدات المفردة (SNPs) في دراسة الأمراض البشرية." علامات المرض 17 ، العدد 2 (2001): 89-98. <a href = "https://downloads.hindawi.com/journals/dm/2001/858760.pdf">https://downloads.hindawi.com/journals/dm/2001/858760.pdf</a></li>
	<li>جاو ، رونغسوي ، وينهونغ زو ، يانغ ليو ، جونهوا لي ، زياو لي ، يانلينغ وين ، هايان وانغ وآخرون "أشباه أنواع SARS-CoV-2 التي تم الكشف عنها من خلال تحليل تعدد أشكال النوكليوتيدات المفردة (SNPs)." الفوعة 12 ، العدد 1 (2021): 1209-1226. <a href="https://www.tandfonline.com/doi/full/10.1080/21505594.2021.1911477">https://www.tandfonline.com/doi/full/10.1080/21505594.2021.1911477</a></li>
</ol>

تعدد أشكال النوكليوتيدات المفردة-snps

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تعدد أشكال النوكليوتيدات المفردة أو SNP هو تباين نيوكليوتيدات مفردة في موقع جينومي محدد في عدد كبير من السكان. وهو النوع الأكثر انتشارًا من تباين التسلسل الموجود في الجينوم البشري. الطفرات النقطية التي تحدث في أكثر من 1٪ من السكان مؤهلة لتكون تعدد الأشكال. وتتواجد هذه العناصر مرة واحدة كل 1000 نيوكليوتيدات في المتوسط في الجينوم البشري. يُعرف استبدال البيورين ببورين آخر (A/G) أو بيريميدين ببيريميدين آخر (C/T) بالانتقال. في المقابل، فإن استبدال البيورين بالبيريميدين (A أو G/C أو T) أو العكس يسمى التحويل. في SNPs، تكون التحولات أكثر وضوحًا من التحويلات.

تُستخدم طرق مختلفة لدراسة الاختلافات الجينية الموجودة في الجينوم، والمعروفة أيضًا باسم التنميط الجيني. على عكس تعدد الأشكال، تتضمن التكرارات الترادفية المفردة (STRs) تكرارات ثنائية أو ثلاثية أو رباعية النوكليوتيدات. غالبًا ما يستخدم العلماء التنميط الجيني لـ SNPs عبر STRs نظرًا لأن SNPs أكثر وفرة واستقرارًا، وتؤثر بعض SNPs بشكل مباشر على النمط الظاهري.

في معظم الأحيان، يتم العثور على تعدد الأشكال في الإنترونات، والتي لا ترمز لأي بروتين. يمكن استخدام مثل هذه الأشكال من تعدد الأشكال كعلامات بيولوجية لتحديد الجينات المرتبطة بمرض معين. إذا كان SNP موجودًا داخل الجين أو في تسلسل تنظيمي بالقرب من الجين، فقد يؤثر على وظيفته ويسبب المرض.

</div>

تعدد أشكال النوكليوتيدات المفردة-SNPs

تعدد أشكال النوكليوتيدات المفردة أو SNP هو تباين نوكليوتيدات واحد في موقع جيني محدد في عدد كبير من السكان. إنه الأكثر انتشارا ...

Education

JoVE Core

Molecular Biology

البيولوجيا الجزيئية

Unit 2

الوحدة الثانية

Analyzing Gene Expression and Function

تحليل التعبير الجيني ووظيفته

KEY TERMS AND CONCEPTS

المصطلحات والمفاهيم الأساسية

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.

SNPs as Genetic Markers and Variants

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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

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.

bacterial transformation

Bacterial Transformation in the Lab

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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...

reporter genes

Reporter Genes in Cells and Plasmids

Reporter genes are protein-coding genes used to track gene activity in cells. They are often tagged to a gene of interest so scientists can see whether that gene is present or active. When the tagged genes are expressed together, reporter genes can produce visible signals such as fluorescence or luminescence. These signals help show the presence or absence of a gene of interest in an organism. They can also reveal the pattern of gene expression or the location of a DNA segment or protein...

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

Chromatin immunoprecipitation, or ChIP, is an antibody-based method for finding where proteins bind to DNA. It is used to identify DNA sites bound by transcription factors or histone proteins. ChIP also helps show which histone changes are present, including acetylation, phosphorylation, and methylation. ChIP is commonly divided into two forms: X-ChIP and N-ChIP. X-ChIP first cross-links proteins to DNA inside the cell, then breaks the DNA into pieces by sonication. The protein-DNA complexes...

synthetic biology

Synthetic Biology in Crops and Cells

Synthetic biology combines engineering, molecular biology, cell biology, and systems biology to redesign living systems. Scientists use it to remodel organisms from nature or to build new synthetic organisms. These tools can support protein or enzyme production, bioremediation, the production of useful macromolecules, and the addition of helpful traits to crops. One well-known example is golden rice. This genetically modified rice plant makes grains rich in β-carotene, which is a precursor of...

ribosome profiling

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...

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

Gene Therapy for Disease Treatment

Gene therapy is a treatment approach that changes gene activity to help address disease. It focuses on the genetic cause of a problem rather than only easing symptoms. In this way, it is used in disease intervention. One common strategy is to replace a faulty gene with a normal copy. Another strategy is to inactivate a gene that is causing harm. Gene therapy can also introduce a new gene to help cells work more normally.

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

Genome-wide association studies, or GWAS, look for common SNPs, or single nucleotide polymorphisms, that may be linked to disease. Researchers compare how often a SNP appears in people with a disease and in people without it. When a SNP is seen more often in the disease group, it is considered associated with that disease. GWAS uses chi-square analysis to test the chance that an allele is linked to the disease. This approach does not require scientists to first find the target gene behind the...

key terms and concepts

Explore SNPs as common DNA variants, including transitions, transversions, and how they help scientists find genes linked to disease.

SNPs as Genetic Markers and Variants | JoVE K12

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SNPs as Genetic Markers and Variants

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