Name: genome variation in cnvs and snps
Uploaded: 2021-04-07T12:11:59.000Z
Duration: 2 min 26 s
Channel: JoVE

K12 Standards

Louisiana Student Standards for Science

High School

Life Sciences

Biological Evolution: Unity And Diversity

HS-LS4-1

comparing-copy-number-variations-and-snps

Comparing Copy Number Variations and SNPs

DNA 분절의 추가 또는 삭제와 같은 게놈 변이는 집단에서 일반적으로 관찰됩니다. 집단의 게놈 변이는 DNA의 단일 뉴클레오티드 변화 또는 염색체의 구조적 변화로 인해 발생할 수 있습니다.
복제 수 변이 또는 CNV는 1kg 이상의 염기쌍 DNA 세그먼트와 관련된 구조적 변이를 정의하는 포괄적인 용어입니다.
관련된 염색체 분절에 유전자가 포함되어 있는 경우, CNV는 복제 및 삽입을 통해 해당 유전자의 복제 수를 증가시키거나 null 유전자형을 초래하는 결실을 통해 복제 수를 감소시킬 수 있습니다.
따라서 일부 개인은 유전자 사본이 두 개 이상이거나 전혀 없을 수 있습니다. 예를 들어, 유럽의 유전적 조상을 가진 일부 사람들은 Rhesus 혈액형 유전자인 RHD의 사본이 두 개 있을 수 있는 반면, 어떤 사람들은 하나만 가지고 있고 다른 사람들은 전혀 가지고 있지 않을 수 있습니다.  
CNV는 기능적 유전자 사본의 수에 의존하는 표현형에 영향을 미칠 수 있습니다. 전분 기반 식단이 일반적인 유럽-미국 및 아시아 지역에서는 인구가 전분 대사에 관여하는 유전자인 유전자 AMY1의 복제 수가 더 높습니다.
CNV는 또한 건선, 파킨슨병과 같은 여러 질병 및 자폐증 및 정신 분열증과 같은 행동 장애와 관련이 있습니다.
CNV는 일반적으로 큰 DNA 염기서열 변이를 다루지만, 단일 뉴클레오티드 다형성 또는 SNP는 게놈 전체에서 발견되는 무작위 단일 염기 치환입니다.
이러한 염기 치환은 뉴클레오티드 1000개마다 한 번씩 발생하지만, 모든 염기가 SNP에 해당하지는 않습니다. 일반적으로 인구의 1% 이상에서 발견되는 뉴클레오티드 변이만 SNP라고 합니다.
SNP는 당뇨병이나 암과 같은 다양한 질병을 유발할 수 있습니다. 예를 들어, 겸상 적혈구 빈혈 환자의 경우, 베타 글로빈 유전자의 특정 부위에서 아데닌에서 티민으로의 단일 염기 치환은 낫 모양의 적혈구를 유발합니다.

<ol>
	<li>Lee, Charles 및 Stephen W. Scherer. "인간 게놈에서 복제 수 변이의 임상 적 맥락." 분자 의학 전문가 리뷰 12 (2010).</li>
	<li>Budowle, Bruce 및 Angela Van Daal. "법의학적으로 관련된 SNP 클래스." Biotechniques 44, no. 5 (2008) : 603-610.</li>
</ol>

카피수 변이와 snp 비교

인간 게놈의 서열 분석을 통해 게놈에 대한 몇 가지 최고의 비밀이 밝혀졌습니다. 과학자들은 한 집단 내에 존재하는 수천 개의 게놈 변이를 확인했습니다. 이러한 변이는 단일 뉴클레오티드일 수도 있고 더 큰 염색체 변이일 수도 있습니다.

카피 수 변이 또는 CNV는 1kb 이상의 DNA 서열을 포괄하는 구조적 변이입니다. 반면, 단일염기 다형성(SNP)은 인구의 1% 이상에서 발견되는 단일 염기 변화 또는 점 돌연변이입니다. CNV와 SNP는 모두 유전자 스크리닝 연구와 친족 분석에서 매우 가치가 있습니다.

CNV의 형태.

CNV에는 5가지 형태가 있습니다. 첫 번째는 삭제라고 합니다. DNA 마디의 손실은 유전자 또는 유전자 그룹의 복제 수를 감소시킬 수 있습니다. 두 번째는 직렬 복제라고 합니다. 여기에서는 염색체 부분의 복사본이 인접한 영역에 삽입됩니다. 세 번째는 비연속 중복이라고 합니다. 여기서 염색체 부분은 복제되어 먼 염색체 영역이나 다른 염색체에 삽입됩니다. 네 번째 형태는 Multiallelic CNV라고 합니다. DNA 조각은 여러 번 복제되어 유전자의 여러 대립 유전자가 형성됩니다. 다섯 번째 형태는 복합 재배열(complex rearrangement)이라고 합니다. 여기서 DNA의 한 부분은 동일하거나 다른 염색체에 다시 삽입되기 전에 복제되고 반전됩니다.

단일 뉴클레오티드 다형성

단일 뉴클레오티드 다형성(SNP)은 단일 뉴클레오티드 염기의 변경과 관련된 또 다른 유형의 게놈 변이입니다. 과학자들은 인간 게놈 전체에서 수천 개의 SNP를 확인했으며, 이는 유전병 및 법의학 분석을 위한 유전적 마커로 일상적으로 사용됩니다.

SNP는 용도에 따라 4가지 유형으로 구분됩니다. 신원 검사 SNP는 사람을 구별하고 가족 관계에서 사람들을 제거하는 데 사용됩니다. 계보 정보 SNP는 가족 분석에서 실종된 개인을 식별하는 데 도움이 되는 밀접하게 연결된 SNP입니다. 혈통 정보 SNP는 개인의 혈통을 확립하고 이를 표현형 특성과 연결하는 데 도움이 됩니다. 표현형 정보 SNP는 피부색, 눈 색깔 등과 같은 특정 표현형을 상속받을 확률을 설정합니다.

카피수 변이와 SNP 비교

인간 게놈의 염기서열 분석은 게놈의 몇 가지 가장 잘 지켜진 비밀을 밝혀냈습니다. 과학자들은 존재하는 수천 개의 게놈 변이를 확인했습니다.

Education

교육

JoVE Core

Molecular Biology

분자생물학

Unit 2

제2단원

Genomes and Evolution

유전체와 진화

KEY TERMS AND CONCEPTS

주요 용어 및 개념

genome variation in cnvs and snps

Genome variation in CNVs and SNPs shows how DNA can differ across people in a population. These differences may involve a single nucleotide, which is one DNA base, or a larger chromosomal change. Scientists study them to understand inherited variation in the human genome.

Copy number variations, or CNVs, are structural changes that cover more than 1 kb of DNA sequence. A CNV can change the number of copies of a gene or a group of genes. The main forms are deletion, tandem duplication, noncontiguous duplication, multiallelic CNV, and complex rearrangement.

A deletion removes a DNA segment and can lower gene copy number. In tandem duplication, a copied chromosomal segment is inserted next to the original region. In noncontiguous duplication, the copied segment moves to a distant chromosomal region or even a different chromosome. Multiallelic CNV creates several copies and can produce multiple alleles of a gene. In complex rearrangement, a segment duplicates and inverts before it is inserted back into the same or a different chromosome.

Single nucleotide polymorphism, or SNP, is another genomic variation that changes one nucleotide base. A SNP is a point mutation found in more than 1% of the population. Scientists have identified thousands of SNPs across the human genome, and they are widely used as genetic markers in studies of inherited disease and forensic analysis.

SNPs are grouped by use into four types. Identity-testing SNPs help distinguish people and exclude familial connections. Lineage informative SNPs are tightly linked SNPs that help identify missing individuals in family analysis. Ancestry informative SNPs help connect a person's ancestry with related phenotypic traits. Phenotype informative SNPs help estimate the chance of traits such as skin color or eye color.

Genome Variation in CNVs and SNPs

evolutionary relationships through genome comparisons

evolutionary-relationships-through-genome-comparisons

Tracing Evolution with Genome Data

Genome data helps scientists trace how organisms are related over time. When two species share a common feature, it is often encoded by DNA sequences that have stayed conserved in both species. As genome sequencing improved in the late 20th century, researchers gained a better way to compare conserved domains across species and use that evidence to infer evolutionary relationships. Genome comparison can show evolutionary relationships at three levels. At the broadest level, it highlights...

genome copying errors

DNA Replication Error Checks

DNA replication includes built-in error checks that protect the genome during cell division. Even though this process copies millions of base pairs with high fidelity, a wrong base or a longer stretch of wrong bases can still be added to the daughter strands. If these mistakes are not corrected, cells may build up mutations that can threaten survival. One level of repair is proofreading. DNA polymerase enzymes, which build the new DNA strand, can make about 1 incorrect nucleotide per 100,000...

phylogenetic trees

Reading Evolution in Phylogenetic Trees

Phylogenetic trees show how organisms are related through evolution. They map branching patterns that trace common ancestry and help scientists compare species over time. A phylogenetic tree can be read like a family tree for life. Each branch point marks a split from a shared ancestor, and the pattern of branches shows how closely related different organisms are. These trees are used to organize biological information and to study evolutionary change. They can also help scientists understand...

synteny and evolution

Chromosome Rearrangements and Synteny

Chromosome rearrangements and synteny show how shared gene order can reveal evolutionary history. Synteny means genes are found on the same chromosome, even if they are not genetically linked. John H. Renwick coined the term in 1971. Species with common ancestry often keep conserved syntenic regions. Scientists use synteny to compare the evolutionary relationship between species. Human and mouse lineages split from a common ancestor about 80 million years ago. Since then, the ancestral...

multi-species conserved sequences

Conserved DNA Across Species

Conserved DNA across species shows how some genome regions stay nearly unchanged over time. Next-generation sequencing has built large genome databases for many animals and plants. Since the Human Genome Project, scientists have compared the genomes of primates, mammals, and other distant species. These large studies have helped reveal evolutionary relationships between organisms. Although species genomes differ greatly, a few DNA sequences are highly conserved. Conserved DNA sequences found...

gene duplication and divergence

How Duplicate Genes Shape Evolution

Gene duplication helps drive evolution by creating extra copies of DNA that can change over time. The seminal work of Ohno in 1970 helped popularize this idea. DNA sequence comparisons show that many genes in bacteria, archaebacteria, and eukaryotes came from duplication and later divergence, which makes this process important in evolution. The duplicated copies of a gene are called paralogs. When paralogs have similar sequences and functions, they form a gene family. Many gene families have...

exon recombination

How Exons Mix to Form New Genes

Exon recombination helps new genes form by mixing exons from the same gene or from different genes. This process is also called exon shuffling or domain shuffling. It has been seen in vertebrates, invertebrates, and some plants, including potatoes and sunflowers. During exon recombination, exons join in new exon-intron combinations. These new combinations may later become new genes. Exon shuffling follows splice frame rules, which means the exons must fit the reading frame correctly. Each...

comparing copy number variations and snps

Genome variation in CNVs and SNPs shows how DNA can differ across people in a population. These differences may involve a single nucleotide, which is one DNA base, or a larger chromosomal change. Scientists study them to understand inherited variation in the human genome. Copy number variations, or CNVs, are structural changes that cover more than 1 kb of DNA sequence. A CNV can change the number of copies of a gene or a group of genes. The main forms are deletion, tandem duplication,...

key terms and concepts

Explore how copy number variations and SNPs change the human genome, from deletions and duplications to ancestry, identity, and phenotype markers.

Genome Variation in CNVs and SNPs | JoVE K12

molecular biology

JoVE Core 분자생물학은 명확하고 간결한 애니메이션을 통해 분자 단계에서 일어나는 세포 과정을 설명합니다.또한, 과학자가 직접 실험을 진행하는 실사 영상을 통해 분자생물학 개념의 응용 사례를 보여줍니다.

ohios-learning-standards-and-model-curriculum

Ohio’s Learning Standards and Model Curriculum

9-12

Biology

Evolution

Speciation

Tennessee Academic Standards

Heredity

BIO1.LS3.2

Virginia  Standards of Learning

HIgh School

BIO.5

BIO.5.d

Minnesota Academic Standards in Science

Life Science

3.2.1 9L.3.2.1.3

new-jersey-student-learning-standards-for-science

New Jersey Student Learning Standards for Science

Biological Evolution: Unity and Diversity

Arizona Science Standards

HS+B.L4

HS+B.L4U1.13

Next Generation Science Standards

heredity-inheritance-and-variation-of-traits

Heredity: Inheritance and Variation of Traits

HS-LS3-2

new-york-state-science-learning-standards

New York State Science Learning Standards

Inheritance and Variation of Traits

HS-LS3-1.

The DNA Helix

Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA ...

The Central Dogma

The central dogma explains the flow of genetic information from DNA nucleotides to the amino acid sequence of proteins.
RNA is the Missing Link Between ...

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations ...

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

Genome Size and the Evolution of New Genes

Gene Families

Gene Evolution - Fast or Slow?

types-of-genetic-transfer-between-organisms

Types of Genetic Transfer Between Organisms

Evolutionary Relationships through Genome Comparisons

Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is ...

Genome Copying Errors

DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a ...

Phylogenetic Trees

Gene Duplication and Divergence

The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of ...

Exon Recombination

The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new ...

Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist ...

Analyze and interpret scientific information that common ancestry and biological evolution are supported by multiple lines of empirical evidence. Emphasis is on a conceptual understanding of the role each line of evidence (e.g., similarities in DNA sequences, order of appearance of structure during embryological development, cladograms, homologous and vestigial structures, fossil records) demonstrates as related to common ancestry and biological evolution.

What is Natural Selection?

Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become ...

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural ...

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to ...

Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly ...

Natural Selection

Fitness
Widespread variation of phenotypes in natural populations provides the raw material for evolution, which is the change in the inherited traits of ...

Simulating Natural Selection
ExpandTo prepare for the lab, set out workstations for each student pair containing 6 white, 6 black, and 13 gray 12 inch ...

Simulating Natural Selection
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Artificial Selection

Natural Selection and Adaptive Evolution
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Observing Artificial Selection in Plants
ExpandTwo weeks before beginning the pollination experiments, collect a sufficient amount of small pots with a ...

Observing Artificial Selection in Plants 
ExpandTo begin the experiment, collect five two-week old grown plants from the generation one population that ...

Natural Selection and Adaptation

Natural selection drives evolution by supporting organisms that are best adapted to their environments, enhancing their survival and reproduction rates.
...

Natural Selection and Mating Preferences

The principle of natural selection suggests that organisms better adapted to their environment are more likely to survive and reproduce.
Evolutionary ...

What is Population Genetics?

A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, ...

Genetic Drift

Natural selection&#x2014;probably the most well-known evolutionary mechanism&#x2014;increases the prevalence of traits that enhance survival and ...

Gene Flow

Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.

This ...

Construct an explanation based on evidence that biological diversity is influenced by (1) the potential for a species to increase in number, (2) the heritable genetic variation of individuals in a species due to mutation and sexual reproduction, (3) competition for limited resources, and (4) the proliferation of those organisms that are better able to survive and reproduce in the environment. Emphasis is on using evidence to explain the influence each of the four factors has on number of organisms, behaviors, morphology, or physiology in terms of ability to compete for limited resources and subsequent survival of individuals and adaptation of species. Examples of evidence could include mathematical models such as simple distribution graphs or proportional reasoning.

HS-LS4-2

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions ...

Hardy-Weinberg Principle

Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the ...

Apply concepts of statistics and probability to support explanations that populations of organisms adapt when an advantageous heritable trait increases in proportion to organisms lacking this trait. Emphasis is on analyzing shifts in numerical distribution of traits and using these shifts as evidence to support explanations for adaptations. Explanations could include basic statistical or graphical analysis.

HS-LS4-3

Understanding Species and Reproductive Barriers

A species is a group of organisms that interbreed and produce fertile offspring. Typically, individuals of the same species appear similar and share ...

Formation of Species

Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the ...

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and ...

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species&#x2014;groups of reproductively isolated populations.The ...

Hybrid Zones

Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may ...

Extinction

The History of Life on Earth
Fossils of organisms that were different from anything alive today had been documented as early as the 17th century, but it ...

Diversity and Extinction during the Paleogene Epoch
ExpandFirst, familiarize yourself with the extinction reading supplement for the background on what ...

Diversity and Extinction during the Paleogene Epoch
ExpandBegin this procedure by reading the extinction reading supplement that has been printed out for ...

Evaluate evidence supporting claims that changes in environmental conditions can affect the distribution of traits in a population causing: (1) increases in the number of individuals of some species, (2) the emergence of new species over time, and (3) the extinction of other species. Emphasis is on determining cause and effect relationships for how changes to the environment such as deforestation, overfishing, application of fertilizers, drought, flood, and the rate of change of the environment affect distribution or disappearance of traits in species.

HS-LS4-5

Genome Variation in CNVs and SNPs

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