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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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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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Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
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Copy Number Variations in Tilapia Genomes.

Bi Jun Li1, Hong Lian Li1, Zining Meng1

  • 1State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Provincial Key Laboratory for Aquatic Economic Animals, College of Life Sciences, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China.

Marine Biotechnology (New York, N.Y.)
|February 8, 2017
PubMed
Summary

This study identifies 4,642 copy number variations (CNVs) in tilapia genomes, revealing structural variations linked to population differences. These CNVs may influence tilapia phenotypes and environmental adaptations.

Keywords:
Association analysisCopy number variationGenome-wide scanTilapia

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Area of Science:

  • Genomics
  • Population Genetics
  • Bioinformatics

Background:

  • Genome variation is key to understanding phenotypic diversity.
  • While single nucleotide polymorphisms (SNPs) are known in tilapia, larger structural variants like copy number variations (CNVs) remain uncharacterized genome-wide.
  • CNVs play crucial roles in evolution and adaptation.

Purpose of the Study:

  • To perform the first genome-wide scan for copy number variations (CNVs) in tilapia populations.
  • To characterize the distribution and potential impact of CNVs on tilapia genome.
  • To identify CNVs associated with population-specific differences.

Main Methods:

  • Genome-wide scan for CNVs in 47 individuals from three tilapia populations using 254 Gb of paired-end sequencing data.
  • Identification and high-confidence filtering of distinct CNVs.
  • Association analysis using linear model regression to detect CNVs linked to population types.

Main Results:

  • Identified 4,642 distinct high-confidence CNVs, accounting for 1.9% of the Nile tilapia reference genome.
  • Found 1,100 CNVs overlapping with protein-coding gene exons.
  • Detected 85 CNVs significantly associated with population types, suggesting a genetic basis for population differentiation.

Conclusions:

  • This study provides the first genome-wide insights into CNVs in tilapia.
  • Identified CNVs may contribute to phenotypic variation and adaptation within and among tilapia populations.
  • CNV analysis offers a new avenue for understanding tilapia evolution and selective breeding.