The document discusses several DNA techniques including restriction endonucleases, gel electrophoresis, DNA hybridization, and cloning. Restriction endonucleases cut DNA molecules at specific sites and are used to create DNA fragments of defined sizes. Gel electrophoresis separates DNA and RNA fragments by size and allows visualization of bands. DNA hybridization uses labeled probes to identify specific DNA sequences. Cloning involves inserting DNA fragments into vectors to propagate and amplify the DNA, allowing study and manipulation of genes.
Blotting techniques such as Southern blots, Northern blots, and Western blots can be used to visualize specific DNA, RNA, or proteins separated by electrophoresis. Southern blots involve digesting DNA with restriction enzymes, separating fragments by size via gel electrophoresis, transferring DNA to a membrane, and using probes to detect specific DNA sequences. Northern blots similarly separate RNA before transfer and probing. Western blots separate proteins and use antibodies to detect specific proteins. These techniques allow detection of gene copy numbers as well as deletions, insertions or rearrangements in genes.
1. DNA or proteins are separated by gel electrophoresis.
2. The molecules are then transferred to a membrane through blotting.
3. For Southern blotting, DNA is detected using labeled probes that hybridize to complementary DNA sequences. For Western blotting, proteins are detected using primary and secondary antibodies that bind to the protein of interest.
4. These techniques are used for applications like identifying genes, detecting infectious diseases and genetic disorders, and forensic analysis.
This document discusses advanced electrophoresis techniques used in genomics and proteomics. It describes how electrophoresis separates charged molecules like DNA, RNA, and proteins based on their size, shape, and charge. It then explains different supporting media like cellulose acetate, agarose, and polyacrylamide gels and how they separate molecules. The document also covers techniques like two-dimensional electrophoresis, pulsed field gel electrophoresis, isoelectric focusing, capillary electrophoresis, and methods to detect DNA polymorphisms and mutations.
1. DNA or proteins are separated by gel electrophoresis.
2. The molecules are then transferred to a membrane through either southern or western blotting.
3. For southern blotting, DNA is detected through hybridization with a labeled probe. For western blotting, specific proteins are detected through interaction with labeled antibodies.
4. These techniques are used for diagnostic purposes and research applications such as identifying DNA sequences or proteins of interest.
PPTChapter 6 Molecular Basis of Inheritance G (1).pptxSubhamGhosh96
DNA fingerprinting is a technique that uses variations in DNA sequences to distinguish individuals. It involves extracting DNA from a sample, amplifying it if needed, cutting it with restriction enzymes to isolate variable number tandem repeats, separating the fragments by size using gel electrophoresis, treating the DNA fragments with a radioactive probe, and exposing X-ray film to create an image-based fingerprint of the sample's DNA pattern. This fingerprint can then be used to identify individuals or determine familial relationships for various applications like criminal investigations, identifying remains, and tracing hereditary conditions.
PPTChapter 6 Molecular Basis of Inheritance G.pptxMaryDiana27
DNA fingerprinting is a technique that uses variations in DNA sequences to distinguish individuals. It involves extracting DNA from a sample, amplifying it if needed, cutting it with restriction enzymes to isolate variable number tandem repeats, separating the fragments by size using gel electrophoresis, treating the DNA fragments with a radioactive probe, and exposing X-ray film to create an image-based fingerprint of the sample's DNA pattern. This fingerprint can then be used to identify individuals or determine familial relationships for various applications like criminal investigations, identifying remains, and tracing hereditary conditions.
This document describes the Maxam-Gilbert method of DNA sequencing. It involves radioactively labeling DNA, cleaving it with specific chemical treatments at adenine, guanine, cytosine, or cytosine and thymine bases, and separating the fragments by size via electrophoresis on an acrylamide gel. Comparison of the fragment sizes allows deduction of the DNA sequence. While it does not require DNA polymerases, the Maxam-Gilbert method uses hazardous chemicals and radioactive material, has technical complexity, and is not widely used due to the development of safer methods like Sanger sequencing.
The document discusses several DNA techniques including restriction endonucleases, gel electrophoresis, DNA hybridization, and cloning. Restriction endonucleases cut DNA molecules at specific sites and are used to create DNA fragments of defined sizes. Gel electrophoresis separates DNA and RNA fragments by size and allows visualization of bands. DNA hybridization uses labeled probes to identify specific DNA sequences. Cloning involves inserting DNA fragments into vectors to propagate and amplify the DNA, allowing study and manipulation of genes.
Blotting techniques such as Southern blots, Northern blots, and Western blots can be used to visualize specific DNA, RNA, or proteins separated by electrophoresis. Southern blots involve digesting DNA with restriction enzymes, separating fragments by size via gel electrophoresis, transferring DNA to a membrane, and using probes to detect specific DNA sequences. Northern blots similarly separate RNA before transfer and probing. Western blots separate proteins and use antibodies to detect specific proteins. These techniques allow detection of gene copy numbers as well as deletions, insertions or rearrangements in genes.
1. DNA or proteins are separated by gel electrophoresis.
2. The molecules are then transferred to a membrane through blotting.
3. For Southern blotting, DNA is detected using labeled probes that hybridize to complementary DNA sequences. For Western blotting, proteins are detected using primary and secondary antibodies that bind to the protein of interest.
4. These techniques are used for applications like identifying genes, detecting infectious diseases and genetic disorders, and forensic analysis.
This document discusses advanced electrophoresis techniques used in genomics and proteomics. It describes how electrophoresis separates charged molecules like DNA, RNA, and proteins based on their size, shape, and charge. It then explains different supporting media like cellulose acetate, agarose, and polyacrylamide gels and how they separate molecules. The document also covers techniques like two-dimensional electrophoresis, pulsed field gel electrophoresis, isoelectric focusing, capillary electrophoresis, and methods to detect DNA polymorphisms and mutations.
1. DNA or proteins are separated by gel electrophoresis.
2. The molecules are then transferred to a membrane through either southern or western blotting.
3. For southern blotting, DNA is detected through hybridization with a labeled probe. For western blotting, specific proteins are detected through interaction with labeled antibodies.
4. These techniques are used for diagnostic purposes and research applications such as identifying DNA sequences or proteins of interest.
PPTChapter 6 Molecular Basis of Inheritance G (1).pptxSubhamGhosh96
DNA fingerprinting is a technique that uses variations in DNA sequences to distinguish individuals. It involves extracting DNA from a sample, amplifying it if needed, cutting it with restriction enzymes to isolate variable number tandem repeats, separating the fragments by size using gel electrophoresis, treating the DNA fragments with a radioactive probe, and exposing X-ray film to create an image-based fingerprint of the sample's DNA pattern. This fingerprint can then be used to identify individuals or determine familial relationships for various applications like criminal investigations, identifying remains, and tracing hereditary conditions.
PPTChapter 6 Molecular Basis of Inheritance G.pptxMaryDiana27
DNA fingerprinting is a technique that uses variations in DNA sequences to distinguish individuals. It involves extracting DNA from a sample, amplifying it if needed, cutting it with restriction enzymes to isolate variable number tandem repeats, separating the fragments by size using gel electrophoresis, treating the DNA fragments with a radioactive probe, and exposing X-ray film to create an image-based fingerprint of the sample's DNA pattern. This fingerprint can then be used to identify individuals or determine familial relationships for various applications like criminal investigations, identifying remains, and tracing hereditary conditions.
This document describes the Maxam-Gilbert method of DNA sequencing. It involves radioactively labeling DNA, cleaving it with specific chemical treatments at adenine, guanine, cytosine, or cytosine and thymine bases, and separating the fragments by size via electrophoresis on an acrylamide gel. Comparison of the fragment sizes allows deduction of the DNA sequence. While it does not require DNA polymerases, the Maxam-Gilbert method uses hazardous chemicals and radioactive material, has technical complexity, and is not widely used due to the development of safer methods like Sanger sequencing.
To understand the basic concept of blotting techniques (Southern, northern, western)
To know the main applications and advantages of each of the main types of blotting techniques
To be familiar with the steps (in brief) for performing a blotting procedure
To understand the major similarities & differences between different blotting techniques
To be introduced to an example of applying a blotting technique in diagnosis of diseases (SCA)
The document discusses techniques for characterizing and using cloned DNA fragments, including gel electrophoresis to separate vector and cloned DNA, sequencing cloned DNA using the dideoxy chain termination method, and subcloning DNA fragments into vectors. It focuses on the basic Sanger dideoxy chain termination method for sequencing cloned DNA fragments, which involves synthesizing truncated daughter strands using dideoxyribonucleotides to terminate DNA synthesis and reading the sequence based on fragment size separation.
Southern blotting is a technique used to detect specific DNA sequences within DNA samples. It involves digesting DNA with restriction enzymes, separating fragments via gel electrophoresis, transferring DNA fragments to a membrane, and probing the membrane with a labeled complementary DNA sequence. Any hybridized probes will be detected, indicating the presence and size of the DNA fragment of interest.
Blotting techniques such as Southern blot, Northern blot, and Western blot allow researchers to transfer separated DNA, RNA, or proteins onto a carrier membrane. A Southern blot uses gel electrophoresis to separate DNA by size, then transfers the DNA to a membrane where it can be probed with a complementary DNA probe to detect specific genes or DNA sequences. The probe hybridizes, or binds, to its complementary target sequence. This allows researchers to detect the presence and size of particular DNA sequences in a sample.
This document discusses DNA fingerprinting techniques for identifying herbal drugs, including those of natural origin. It describes several DNA-based marker techniques like RFLP, RAPD, AFLP, and ISSR that can generate unique DNA profiles to distinguish between plant species and identify adulteration. The document also provides a case study on using RAPD-PCR and six primer pairs to generate DNA fingerprints to identify the herbal plant Exacum lawii. The results found unique DNA banding profiles that can be used to authenticate Exacum lawii.
This document provides information about physical mapping techniques used in molecular biology. It discusses that physical mapping can determine the sequence and physical distance between DNA base pairs with high accuracy. There are two main types of physical mapping: low resolution mapping, which can resolve DNA ranging from 1 base pair to several megabases, and high resolution mapping, which can resolve hundreds of kilobases to a single nucleotide. Some key techniques used for physical mapping include restriction mapping, fluorescent in situ hybridization (FISH) mapping, and sequence tagged site (STS) mapping. Restriction mapping involves cutting DNA at specific restriction sites to map fragment locations. FISH allows localization of specific DNA sequences on chromosomes using fluorescent probes. STS mapping uses short, unique
1. Electrophoresis separates nucleic acids and proteins by size and charge using agarose or acrylamide gels.
2. Southern blots allow detection of specific DNA sequences by transferring DNA from a gel to a membrane and hybridizing a labeled probe.
3. Restriction fragment length polymorphisms (RFLPs) detect variations in restriction sites between individuals' DNA that can be used for identification.
1. Electrophoresis separates nucleic acids and proteins by size and charge using agarose or acrylamide gels.
2. Southern blots allow detection of specific DNA sequences by transferring DNA from a gel to a membrane and hybridizing a labeled probe.
3. Restriction fragment length polymorphisms (RFLPs) detect variations in restriction sites between individuals' DNA that can be used for identification.
Nucleic acid hybridization can be used to identify particular DNA sequences using a nucleic acid probe. The technique takes advantage of DNA's property of complementary base pairing - if DNA is separated into single strands, the complementary strands will reform into double helices when conditions are right. A nucleic acid probe is a short, radioactively labelled single-stranded DNA or RNA molecule that binds to complementary nucleic acid sequences, allowing them to be identified. Genetic mapping uses genetic markers and recombination frequency during meiosis to locate genes on chromosomes and establish the relative distances between genes.
Nucleic acid hybridization can be used to identify particular DNA sequences using a nucleic acid probe. The technique takes advantage of DNA's property of complementary base pairing - if DNA is separated into single strands, the complementary strands will reform into double helices when conditions are right. A nucleic acid probe is a short, radioactively labelled single-stranded DNA or RNA molecule that binds to complementary nucleic acid sequences, allowing them to be identified. Genetic mapping uses genetic markers and recombination frequency during meiosis to locate genes on chromosomes and establish the relative distances between genes.
Nucleic acid hybridization can be used to identify particular DNA sequences using a nucleic acid probe. The technique takes advantage of DNA's property of complementary base pairing - if DNA is separated into single strands, the complementary strands will reform into double helices when conditions are right. A nucleic acid probe is a short, radioactively labelled single-stranded DNA or RNA molecule that binds to complementary nucleic acid sequences, allowing them to be identified. Genetic mapping uses genetic markers and recombination frequency during meiosis to locate genes on chromosomes and establish the relative distances between genes.
The document discusses the development of recombinant DNA technology in the 1970s at Stanford University, which allowed genetic traits to be transferred between organisms by recombining their DNA. This process is similar to editing text by cutting and pasting. An example given is transferring the human gene for insulin production into E. coli bacteria, which then rapidly produce human insulin that can be harvested. Key techniques in recombinant DNA include restriction enzymes, plasmids, gene cloning, polymerase chain reaction (PCR), and DNA fingerprinting.
Nucleic acid hybridization is a technique used to identify specific DNA sequences. It involves denaturing DNA or RNA samples and probes, followed by annealing of the probes to complementary sequences. There are two main types: Southern blotting separates DNA fragments by gel electrophoresis before hybridization with probes, while Northern blotting separates RNA this way. Both techniques allow detection of specific sequences through the use of labeled probes.
This document provides information on various genetic mapping techniques. It discusses locus, genome, linked genes, genetic distance, and recombination frequency. It then describes genetic mapping and the different types of maps - genetic/linkage maps and physical maps. Genetic maps are based on recombination frequencies while physical maps use techniques like in situ hybridization. Restriction mapping and DNA footprinting are also summarized as methods to determine the order and location of genes and restriction sites on chromosomes. Transposable elements in eukaryotes are classified into Class I and II based on their mechanism of transposition via RNA intermediates or direct DNA-to-DNA movement.
Electrophoresis is a technique used to separate charged molecules like proteins, nucleic acids, and amino acids. It works by migrating the molecules through a supportive medium like agarose gel or polyacrylamide gel under the influence of an electric field. Larger molecules migrate more slowly than smaller ones. Factors like electric field strength, net charge on the molecule, and temperature influence migration velocity. Electrophoresis is used to separate DNA fragments by size. DNA samples are loaded into wells and electrophoresed, with smaller fragments migrating farther than larger ones. The separated fragments can then be visualized under UV light after ethidium bromide staining. Two-dimensional electrophoresis separately resolves proteins by their isoelectric point and
This document discusses several molecular techniques used in microbiology, including restriction fragment length polymorphism (RFLP), pulsed-field gel electrophoresis (PFGE), and cleaved amplified polymorphic sequences (CAPS). RFLP detects genetic variations by cutting DNA with restriction enzymes and comparing fragment lengths. PFGE improves on standard gel electrophoresis by applying an alternating electric field to better separate very large DNA molecules. CAPS combines PCR and RFLP to detect single base changes without radioactive probes. These techniques are useful for genome mapping, disease analysis, and forensic or epidemiological investigations.
1. The document discusses using laser capture microdissection to isolate DNA from seminiferous tubules containing mature spermatids from testicular tissue of normal and Menkes-affected males. This would allow isolation of pure cell populations for further DNA analysis.
2. Reverse transcriptase PCR is described to transcribe mRNA from the isolated cells into cDNA, which can then be amplified and sequenced to identify any mutations between normal and diseased samples.
3. Quantitative PCR is discussed to couple with reverse transcriptase PCR to fluorescently label and quantify the cDNA, enabling target quantification and analysis of gene expression changes for Menkes disease therapy development.
Southern, Northern, and Western blotting techniques allow researchers to detect specific DNA, RNA, and protein sequences, respectively. Southern blotting involves separating DNA fragments via gel electrophoresis, transferring them to a membrane, and using a probe to identify specific sequences. Northern blotting is similar but detects RNA, and Western blotting detects proteins using antibodies. These techniques are used for applications like gene mapping, diagnostics, studying gene expression, and confirming transgenic organisms.
Optimizing Gradle Builds - Gradle DPE Tour Berlin 2024Sinan KOZAK
Sinan from the Delivery Hero mobile infrastructure engineering team shares a deep dive into performance acceleration with Gradle build cache optimizations. Sinan shares their journey into solving complex build-cache problems that affect Gradle builds. By understanding the challenges and solutions found in our journey, we aim to demonstrate the possibilities for faster builds. The case study reveals how overlapping outputs and cache misconfigurations led to significant increases in build times, especially as the project scaled up with numerous modules using Paparazzi tests. The journey from diagnosing to defeating cache issues offers invaluable lessons on maintaining cache integrity without sacrificing functionality.
To understand the basic concept of blotting techniques (Southern, northern, western)
To know the main applications and advantages of each of the main types of blotting techniques
To be familiar with the steps (in brief) for performing a blotting procedure
To understand the major similarities & differences between different blotting techniques
To be introduced to an example of applying a blotting technique in diagnosis of diseases (SCA)
The document discusses techniques for characterizing and using cloned DNA fragments, including gel electrophoresis to separate vector and cloned DNA, sequencing cloned DNA using the dideoxy chain termination method, and subcloning DNA fragments into vectors. It focuses on the basic Sanger dideoxy chain termination method for sequencing cloned DNA fragments, which involves synthesizing truncated daughter strands using dideoxyribonucleotides to terminate DNA synthesis and reading the sequence based on fragment size separation.
Southern blotting is a technique used to detect specific DNA sequences within DNA samples. It involves digesting DNA with restriction enzymes, separating fragments via gel electrophoresis, transferring DNA fragments to a membrane, and probing the membrane with a labeled complementary DNA sequence. Any hybridized probes will be detected, indicating the presence and size of the DNA fragment of interest.
Blotting techniques such as Southern blot, Northern blot, and Western blot allow researchers to transfer separated DNA, RNA, or proteins onto a carrier membrane. A Southern blot uses gel electrophoresis to separate DNA by size, then transfers the DNA to a membrane where it can be probed with a complementary DNA probe to detect specific genes or DNA sequences. The probe hybridizes, or binds, to its complementary target sequence. This allows researchers to detect the presence and size of particular DNA sequences in a sample.
This document discusses DNA fingerprinting techniques for identifying herbal drugs, including those of natural origin. It describes several DNA-based marker techniques like RFLP, RAPD, AFLP, and ISSR that can generate unique DNA profiles to distinguish between plant species and identify adulteration. The document also provides a case study on using RAPD-PCR and six primer pairs to generate DNA fingerprints to identify the herbal plant Exacum lawii. The results found unique DNA banding profiles that can be used to authenticate Exacum lawii.
This document provides information about physical mapping techniques used in molecular biology. It discusses that physical mapping can determine the sequence and physical distance between DNA base pairs with high accuracy. There are two main types of physical mapping: low resolution mapping, which can resolve DNA ranging from 1 base pair to several megabases, and high resolution mapping, which can resolve hundreds of kilobases to a single nucleotide. Some key techniques used for physical mapping include restriction mapping, fluorescent in situ hybridization (FISH) mapping, and sequence tagged site (STS) mapping. Restriction mapping involves cutting DNA at specific restriction sites to map fragment locations. FISH allows localization of specific DNA sequences on chromosomes using fluorescent probes. STS mapping uses short, unique
1. Electrophoresis separates nucleic acids and proteins by size and charge using agarose or acrylamide gels.
2. Southern blots allow detection of specific DNA sequences by transferring DNA from a gel to a membrane and hybridizing a labeled probe.
3. Restriction fragment length polymorphisms (RFLPs) detect variations in restriction sites between individuals' DNA that can be used for identification.
1. Electrophoresis separates nucleic acids and proteins by size and charge using agarose or acrylamide gels.
2. Southern blots allow detection of specific DNA sequences by transferring DNA from a gel to a membrane and hybridizing a labeled probe.
3. Restriction fragment length polymorphisms (RFLPs) detect variations in restriction sites between individuals' DNA that can be used for identification.
Nucleic acid hybridization can be used to identify particular DNA sequences using a nucleic acid probe. The technique takes advantage of DNA's property of complementary base pairing - if DNA is separated into single strands, the complementary strands will reform into double helices when conditions are right. A nucleic acid probe is a short, radioactively labelled single-stranded DNA or RNA molecule that binds to complementary nucleic acid sequences, allowing them to be identified. Genetic mapping uses genetic markers and recombination frequency during meiosis to locate genes on chromosomes and establish the relative distances between genes.
Nucleic acid hybridization can be used to identify particular DNA sequences using a nucleic acid probe. The technique takes advantage of DNA's property of complementary base pairing - if DNA is separated into single strands, the complementary strands will reform into double helices when conditions are right. A nucleic acid probe is a short, radioactively labelled single-stranded DNA or RNA molecule that binds to complementary nucleic acid sequences, allowing them to be identified. Genetic mapping uses genetic markers and recombination frequency during meiosis to locate genes on chromosomes and establish the relative distances between genes.
Nucleic acid hybridization can be used to identify particular DNA sequences using a nucleic acid probe. The technique takes advantage of DNA's property of complementary base pairing - if DNA is separated into single strands, the complementary strands will reform into double helices when conditions are right. A nucleic acid probe is a short, radioactively labelled single-stranded DNA or RNA molecule that binds to complementary nucleic acid sequences, allowing them to be identified. Genetic mapping uses genetic markers and recombination frequency during meiosis to locate genes on chromosomes and establish the relative distances between genes.
The document discusses the development of recombinant DNA technology in the 1970s at Stanford University, which allowed genetic traits to be transferred between organisms by recombining their DNA. This process is similar to editing text by cutting and pasting. An example given is transferring the human gene for insulin production into E. coli bacteria, which then rapidly produce human insulin that can be harvested. Key techniques in recombinant DNA include restriction enzymes, plasmids, gene cloning, polymerase chain reaction (PCR), and DNA fingerprinting.
Nucleic acid hybridization is a technique used to identify specific DNA sequences. It involves denaturing DNA or RNA samples and probes, followed by annealing of the probes to complementary sequences. There are two main types: Southern blotting separates DNA fragments by gel electrophoresis before hybridization with probes, while Northern blotting separates RNA this way. Both techniques allow detection of specific sequences through the use of labeled probes.
This document provides information on various genetic mapping techniques. It discusses locus, genome, linked genes, genetic distance, and recombination frequency. It then describes genetic mapping and the different types of maps - genetic/linkage maps and physical maps. Genetic maps are based on recombination frequencies while physical maps use techniques like in situ hybridization. Restriction mapping and DNA footprinting are also summarized as methods to determine the order and location of genes and restriction sites on chromosomes. Transposable elements in eukaryotes are classified into Class I and II based on their mechanism of transposition via RNA intermediates or direct DNA-to-DNA movement.
Electrophoresis is a technique used to separate charged molecules like proteins, nucleic acids, and amino acids. It works by migrating the molecules through a supportive medium like agarose gel or polyacrylamide gel under the influence of an electric field. Larger molecules migrate more slowly than smaller ones. Factors like electric field strength, net charge on the molecule, and temperature influence migration velocity. Electrophoresis is used to separate DNA fragments by size. DNA samples are loaded into wells and electrophoresed, with smaller fragments migrating farther than larger ones. The separated fragments can then be visualized under UV light after ethidium bromide staining. Two-dimensional electrophoresis separately resolves proteins by their isoelectric point and
This document discusses several molecular techniques used in microbiology, including restriction fragment length polymorphism (RFLP), pulsed-field gel electrophoresis (PFGE), and cleaved amplified polymorphic sequences (CAPS). RFLP detects genetic variations by cutting DNA with restriction enzymes and comparing fragment lengths. PFGE improves on standard gel electrophoresis by applying an alternating electric field to better separate very large DNA molecules. CAPS combines PCR and RFLP to detect single base changes without radioactive probes. These techniques are useful for genome mapping, disease analysis, and forensic or epidemiological investigations.
1. The document discusses using laser capture microdissection to isolate DNA from seminiferous tubules containing mature spermatids from testicular tissue of normal and Menkes-affected males. This would allow isolation of pure cell populations for further DNA analysis.
2. Reverse transcriptase PCR is described to transcribe mRNA from the isolated cells into cDNA, which can then be amplified and sequenced to identify any mutations between normal and diseased samples.
3. Quantitative PCR is discussed to couple with reverse transcriptase PCR to fluorescently label and quantify the cDNA, enabling target quantification and analysis of gene expression changes for Menkes disease therapy development.
Southern, Northern, and Western blotting techniques allow researchers to detect specific DNA, RNA, and protein sequences, respectively. Southern blotting involves separating DNA fragments via gel electrophoresis, transferring them to a membrane, and using a probe to identify specific sequences. Northern blotting is similar but detects RNA, and Western blotting detects proteins using antibodies. These techniques are used for applications like gene mapping, diagnostics, studying gene expression, and confirming transgenic organisms.
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2. Restriction Mapping
Used to determine the locations of specific restriction
enzyme recognition sites along a DNA molecule, as
well as the distances between these sites
3.
4. Restriction Mapping
Isolation of DNA: The first step in restriction mapping involves isolating the DNA molecule of
interest which can be genomic DNA extracted from an organism, a plasmid DNA, or a specific
DNA fragment obtained through techniques like PCR or cloning.
Digestion with Restriction Enzymes: The isolated DNA is then treated with one or more
restriction enzymes. These enzymes recognize specific DNA sequences, known as recognition
sites or restriction sites, and cleave the DNA at or near these sites
Separation of Fragments by Gel Electrophoresis: After digestion, the DNA fragments are
separated based on their sizes using gel electrophoresis
5. Restriction Mapping
Visualization of DNA Fragments: Once the electrophoresis is complete, the DNA fragments are
visualized using a DNA stain, such as ethidium bromide or SYBR Green. These stains bind to the
DNA molecules, allowing them to be visualized under UV light.
Generation of Restriction Map: The pattern of DNA bands observed on the gel represents the sizes of
the DNA fragments generated by restriction digestion. By analyzing the positions of these bands
relative to known size markers, researchers can determine the sizes of the fragments.
Mapping Analysis: Using the sizes of the DNA fragments obtained from the gel electrophoresis,
researchers can construct a restriction map of the DNA molecule. This map shows the positions of the
restriction sites along the DNA sequence and the distances between them
6.
7. Pulse Field Gel Electrophoresis
A variation of agarose gel electrophoresis
Electric field driving the DNA molecules through the gel frequently changes position
Can separate molecules as large as yeast chromosome (200-300 bp)
8.
9.
10.
11. Breakdown of the mechanism
1. Elongation: When the electrical field is first applied, the DNA molecules begin to
elongate in the direction of the field
2. Reorientation: The electric field then switches direction. Large DNA molecules take
longer to reorient themselves to the new direction compared to smaller ones.
3. Migration: Once reoriented, the DNA molecules can begin migrating again in the
direction of the new field. Smaller molecules will be able to reorient and migrate faster
than larger ones.
12. Breakdown of the mechanism
Steps 2 and 3 are continuously repeated throughout the experiment. With each cycle,
the larger molecules take progressively longer to reorient, resulting in their separation
based on size