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Related Concept Videos

Comparing Copy Number Variations and SNPs02:26

Comparing Copy Number Variations and SNPs

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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
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Single Nucleotide Polymorphisms-SNPs01:05

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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Principles of Pharmacogenetics: Types of Genetic Variants01:27

Principles of Pharmacogenetics: Types of Genetic Variants

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The human genome is over 99.9% identical between individuals, yet genetic differences exist at millions of bases. The human genome contains approximately 3 million variant positions per individual, many of which are heterozygous, contributing to genetic diversity and individual traits. Genetic variations include single-nucleotide polymorphisms (SNPs), insertions, deletions, and copy number variations (CNVs).SNPs, the most common variation, involve single-base changes in DNA. These can be...
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Genome-wide Association Studies-GWAS01:11

Genome-wide Association Studies-GWAS

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Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
GWAS does not require the identification of the target gene involved in...
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Southern Blot02:57

Southern Blot

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Agarose gel electrophoresis is very useful in separating DNA fragments by size. Running a DNA ladder containing fragments of the known length alongside the sample helps determine the approximate length of the sample DNA fragments. However, additional steps are needed to verify the sequence identity of the sample DNA fragments.
Denatured DNA fragments must be transferred onto a carrier membrane from the gel to make it accessible to a probe - a small ssDNA fragment complementary to the target DNA...
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Nucleotide Excision Repair01:38

Nucleotide Excision Repair

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DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
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Application of DNA Fingerprinting using the D1S80 Locus in Lab Classes
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SNPs and SNVs in forensic science.

Bruce S Weir1, Xiuwen Zheng1

  • 1Department of Biostatistics, University of Washington, Box 359461, Seattle, WA 98195-9461, United States.

Forensic Science International. Genetics Supplement Series
|August 11, 2017
PubMed
Summary
This summary is machine-generated.

Large-scale DNA sequencing and SNP assays offer powerful new forensic tools beyond short tandem repeat (STR) markers. Rare genetic variants can reveal population structure and relatedness for advanced forensic identification.

Keywords:
Population geneticsPopulation structureRelatednessSequence variants

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The Visual Colorimetric Detection of Multi-nucleotide Polymorphisms on a Pneumatic Droplet Manipulation Platform
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Area of Science:

  • Forensic genetics
  • Population genetics
  • Genomic analysis

Background:

  • Short tandem repeat (STR) genetic markers are foundational in forensic science, with over 50 million profiles in national databases.
  • Emerging large-scale single nucleotide polymorphism (SNP) and DNA sequencing assays promise to significantly expand the scope and value of forensic genetic data.
  • Future forensic identity statements may incorporate phenotypic characterization alongside genetic data.

Purpose of the Study:

  • To review the application of rare genetic variants in forensic science.
  • To highlight the potential of advanced genomic techniques for describing relatedness and population structure.
  • To contextualize the evolution of forensic genetic marker utility.

Main Methods:

  • Review of current literature on forensic genetic markers.
  • Focus on the utility of rare variants for population structure and relatedness analysis.
  • Discussion of large-scale SNP and DNA sequencing assay capabilities.

Main Results:

  • STR markers are well-established but large-scale SNP and DNA sequence data will likely surpass their current utility.
  • Rare variants are valuable for discerning population structure and relatedness.
  • Advanced genomic assays offer enhanced capabilities for forensic identification and characterization.

Conclusions:

  • The field of forensic genetics is rapidly advancing beyond traditional STR analysis.
  • Large-scale genomic data, particularly rare variants, will play a crucial role in future forensic investigations.
  • The use of rare variants for describing relatedness and population structure represents a significant development in forensic science.