Name: transgenic plants for better crops
Uploaded: 2021-04-07T12:12:00.000Z
Duration: 2 min 50 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

Transgenic Plants

형질전환 식물은 식물의 게놈에 외래 유전자를 도입하여 생산됩니다. 이러한 식물은 바이러스 또는 해충 저항성, 더 높은 수율 또는 치료용 단백질 생산을 포함한 다양한 이유로 개발될 수 있습니다.
형질전환 식물을 생산하기 위해, 관심 유전자와 그 프로모터를 폴리에틸렌 글리콜을 함유한 배지에서 둘 다 배양하여 세포벽이 없는 식물 세포인 식물 원형질체에 도입합니다.
재조합 원형질체는 성장 조절제와 영양분이 있는 상태에서 무균 배지에서 배양됩니다.
원형질체의 세포는 무한정 성장하여 굳은살이라고 하는 미분화 세포 덩어리를 생성합니다. 전분화능 세포(totipotent cell)라고 하는 굳은살의 일부 세포는 새로운 싹과 뿌리를 만들어 완전히 새로운 식물로 자랄 수 있습니다.
형질전환 식물은 토양에서 발견되는 그람 음성 박테리아인 Agrobacterium tumefaciens라는 박테리아를 사용하여 만들 수도 있습니다. 이 박테리아는 일반적으로 식물에서 질병을 일으키는 병원체이며 식물 세포 게놈에 통합될 수 있는 Ti-플라스미드를 포함합니다.
Ti 플라스미드는 숙주 세포 게놈에 삽입할 수 있는 T-DNA 또는 전달 DNA 영역과 숙주 세포로의 T-DNA 전달을 돕기 위해 독성 영역이라는 두 가지 관심 영역을 가지고 있습니다.
이 플라스미드는 T-DNA 영역에 원하는 유전자와 항생제 내성 유전자를 삽입하여 플라스미드 함유 유기체의 선택적 증식을 가능하게 함으로써 변형됩니다. 그런 다음 재조합 플라스미드를 전기 펄스를 가하여 박테리아에 삽입하여 세포 투과성을 높이고 플라스미드가 박테리아로 흡수될 수 있도록 합니다.
재조합 플라스미드를 운반하는 Agrobacterium tumefaciens는 항생제를 함유한 배양 배지에서 성장합니다.
토마토 식물의 자엽 마디와 같은 식물 부분은 박테리아가 포함된 배지에서 절단되어 배양됩니다.
줄기 노드의 가장자리에 있는 상처 입은 식물 세포는 박테리아를 유인하는 화합물을 방출합니다. 박테리아는 식물을 감염시키고 재조합 플라스미드를 방출한 다음 외부 유전자를 식물 세포 게놈으로 전달합니다.
재조합 DNA와 항생제 내성 유전자를 가진 형질전환된 세포만이 항생제를 함유한 배지에서 살아남습니다.
형질전환된 세포는 이제 굳은살을 형성하고 전이유전자를 운반하는 새로운 형질전환 식물로 발달합니다.

<ol>
	<li>Ahmad P, Ashraf M, Younis M, Hu X, Kumar A, Akram NA, Al-Qurainy F. 농업 및 생물 파밍에서 형질 전환 식물의 역할. Biotechnol Adv. 2012 5월-6월; 30(3):524-40. 도: 10.1016/J.Biotechadv.2011.09.006. Epub 2011 9월 17일. PMID: 21959304.</li>
	<li>Gelvin SB. Agrobacterium 매개 식물 형질전환: "유전자 기수" 도구의 생물학. Microbiol Mol Biol 개정판 2003; 67(1):16-37. 도이 : 10.1128 / MMBR.67.1.16-37.2003</li>
</ol>

형질전환 식물

형질전환이라고 불리는 재조합 DNA 기술은 종종 유기체에서 외래 유전자를 추가하거나 해로운 유전자를 제거하는 데 사용됩니다. 이러한 유전자 변형 유기체를 형질전환 유기체라고 합니다.

최초의 형질전환 식물은 1983년에 개발된 담배 식물로 담배 모자이크 바이러스에 대한 저항성을 보였습니다. 이후, 작물의 농업적, 관상적, 원예적 가치를 향상시키기 위해 많은 형질전환 식물이 개발되어 상품화되었습니다. 형질전환 식물은 경제적으로 중요한 대사물질이나 단백질을 생산하기 위한 생물반응기로도 사용될 수 있습니다.

유전자를 식물에 전달하는 물리적 방법

외래 유전자를 식물 원형질체로 전달하기 위해 전기천공법 및 미세투사체 폭격과 같은 많은 방법을 사용할 수 있습니다. 전기천공 중에 장치는 원형질체 현탁액에 고전압 펄스를 전달합니다. 이는 원형질체의 투과성을 증가시켜 외래 DNA가 세포 안으로 들어가 식물 게놈에 통합되도록 합니다.

대조적으로, 미세발사체 충격 또는 생물학적 방법 동안, 텅스텐 또는 금으로 만들어진 구형 입자(미세발사체)는 관심 유전자를 운반하는 플라스미드로 코팅됩니다. 코팅된 입자는 입자 총이라는 장비를 사용하여 300~600m/s로 가속됩니다. 이 장비는 고압 헬륨 가스를 사용하여 플라스미드로 코팅된 입자가 식물 세포벽을 관통하는 데 도움이 되는 추진력을 제공합니다. 관심 있는 유전자가 세포 내부로 들어가면 식물 게놈에 통합됩니다. 이 방법은 캘러스 배양, 분열 조직, 미성숙 배아, 식물 세포 현탁액 등에 DNA를 도입하는 데 사용할 수 있습니다.

형질전환 식물의 응용

재조합 DNA 기술은 해충 및 바이러스 저항성 식물을 개발하는 데 널리 사용됩니다. 이 기술은 종자의 지질, 전분, 단백질 함량을 변경하는 데에도 도움이 됩니다.

예를 들어, 황금쌀은 영양가가 향상된 유전자 변형 벼입니다. 이 형질전환 쌀은 비타민 A의 전구체인 베타카로틴을 생산하여 황금색을 띕니다. 이는 아그로박테리움 매개 DNA 형질전환에 의해 생산되는데, 여기서 파이토엔 합성효소, 파이토엔 불포화효소, 리코펜 베타시클라제 효소를 암호화하는 세 가지 유전자를 운반하는 재조합 DNA가 표적 쌀 배아의 게놈에 삽입됩니다. 그러면 배아는 베타카로틴을 생산하는 식물로 성장합니다. 황금쌀은 개발도상국의 비타민 A 결핍을 해결하기 위해 개발되었습니다.

Bt 목화와 같은 일부 다른 형질전환 식물은 토양에서 발견되는 그람 양성 박테리아인 바실러스 튜린겐시스 박테리아에서 분리된 유전자를 삽입하여 변형되었습니다. 이러한 형질전환 식물은 해로운 곤충을 죽이는 결정 또는 "울음" 단백질을 생산하여 식물을 곤충에 저항하게 만듭니다.

형질전환(transgenesis)이라고 하는 재조합 DNA 기술은 종종 유기체에서 외부 유전자를 추가하거나 해로운 유전자를 제거하는 데 사용됩니다. 그런 유전적으로 ...

Education

교육

JoVE Core

Molecular Biology

분자생물학

Unit 2

제2단원

Analyzing Gene Expression and Function

유전자 발현 및 기능 분석

KEY TERMS AND CONCEPTS

주요 용어 및 개념

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 viruses. Others are used to improve the lipid, starch, or protein content of seeds. In some cases, transgenic plants can also act as bioreactors and make useful metabolites or proteins.

Foreign genes can be transferred into plant protoplasts by physical methods such as electroporation and microprojectile bombardment. In electroporation, high-voltage pulses make the protoplast membrane more permeable. This allows the foreign DNA to enter the cell and integrate into the plant genome. In microprojectile bombardment, also called the biolistic method, tungsten or gold particles are coated with plasmid DNA and shot into the cells with a particle gun.

The particle gun uses high-pressure helium gas to accelerate the coated microprojectiles to about 300 to 600 m/s. The particles can penetrate the plant cell wall and deliver the gene of interest. This method can be used with callus cultures, meristematic tissues, immature embryos, and plant cell suspensions. Once inside the cell, the introduced DNA can integrate into the plant genome.

A well-known example is golden rice, which has enhanced nutritional value. It produces β-carotene, a precursor of vitamin A, and this gives the rice its golden color. Golden rice was made by Agrobacterium-mediated DNA transformation using recombinant DNA with genes for phytoene synthase, phytoene desaturase, and lycopene β-cyclase. It was developed to help address vitamin A deficiency in developing nations.

Another example is Bt cotton. It contains a gene from Bacillus thuringiensis, a gram-positive soil bacterium. The plant makes Cry protein, which kills harmful insects and makes the crop insect resistant. These examples show how transgenic plants can improve crop value and help solve real agricultural problems.

Transgenic Plants for Better Crops

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

Genetic screens are tools used to find genes and mutations linked to specific traits. They are also used to identify people or groups at risk for genetic diseases. That can support early intervention, targeted therapy, and reproductive choices. Forward genetic screens, also called classical screens, start with random DNA changes in an organism. Researchers may use radiation, mutagens, or added bases to create mutations that lead to visible phenotype changes. The mutant is then inbred so...

test cross

Test Cross in Genetic Inheritance

A test cross is a genetics tool used to determine the genotype of an organism with a dominant trait. It helps reveal whether the dominant individual is homozygous or heterozygous by crossing it with a recessive individual. The outcome of the cross shows the hidden genotype. If any offspring show the recessive trait, the dominant parent must carry one recessive allele. If all offspring show the dominant trait, the dominant parent is likely homozygous dominant. Test crosses are common in basic...

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.

bacterial transformation

Bacterial Transformation in the Lab

Bacterial transformation is a lab method used to move new DNA into bacteria. Scientists use it to change how bacteria behave or to help them carry a gene of interest. In high school biology, this process is often shown with plasmids, which are small circular DNA molecules. During transformation, bacteria take up DNA from their surroundings. The new DNA can then be used by the cell, depending on the experiment. This technique is an important part of genetic engineering and is widely used in...

transgenic organisms

Making Transgenic Organisms

Transgenic organisms are living things with DNA added from another organism. A transgene is the inserted gene. Scientists use this method to change an organism’s traits and to study how genes work. To make a transgenic organism, researchers first identify the gene they want to add. They then place that gene into the target organism’s DNA. Once the gene is integrated, the organism can pass it to new cells as it grows. This approach is useful in biology because it helps scientists analyze gene...

reproductive cloning

Cloning an Organism by Reproduction

Reproductive cloning creates a new organism that is genetically the same as the donor. It is different from cloning genes or cells because the goal is to make a whole living individual. This process usually relies on somatic cell nuclear transfer. In this method, the nucleus from a body cell is placed into an egg cell that has had its own nucleus removed. The egg can then develop into an embryo with DNA from the donor cell. Reproductive cloning is used to produce a copy of an organism, such...

crispr

CRISPR Gene Editing Basics

CRISPR is a gene editing tool that helps scientists make targeted changes to DNA. It uses a guide system to find a chosen sequence and a cutting protein to act at that spot. This method is based on a natural defense system found in bacteria. In high school biology, it is often studied as a way to see how genes can be edited with precision. CRISPR is widely used in molecular biology research. It helps scientists explore how genes function and how DNA changes can affect living things.

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 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

Learn how transgenic plants are made and used, from electroporation and biolistic gene transfer to golden rice and Bt cotton in crop improvement.

Transgenic Plants for Better Crops | 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.

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

Arizona Science Standards

Life Science

HS.L3

HS.L3U3.26

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

Georgia Standards of Excellence

SB2.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

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

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

background-and-environment-affect-phenotype

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 ...

Analyze and interpret data to compare DNA samples.

LS.Bio.8.1

Understand genetic mechanisms for variation.

Transgenic Plants for Better Crops

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