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Related Concept Videos

Next-generation Sequencing03:00

Next-generation Sequencing

The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
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Genomics is the science of genomes: it is the study of all the genetic material of an organism. In humans, the genome consists of information carried in 23 pairs of chromosomes in the nucleus, as well as mitochondrial DNA. In genomics, both coding and non-coding DNA is sequenced and analyzed. Genomics allows a better understanding of all living things, their evolution, and their diversity. It has a myriad of uses: for example, to build phylogenetic trees, to improve productivity and...
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Genomic DNA in Eukaryotes

Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
Genome-wide Association Studies-GWAS01:11

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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.
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Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
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Gene Duplication and Divergence02:37

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The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.

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Alu repeat discovery and characterization within human genomes.

Fereydoun Hormozdiari1, Can Alkan, Mario Ventura

  • 1School of Computing Science, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.

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Researchers identified thousands of new Alu insertion sites in human genomes, revealing novel genetic variations. These mobile element patterns differ between populations, offering insights into human ancestry and evolution.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Population Genetics

Background:

  • Human genome sequencing is advancing, yet comprehensive characterization of all genetic variations, including mobile element insertions, remains incomplete.
  • Alu retrotransposition events are a significant source of genetic diversity in primates, but their patterns across diverse human populations are not fully understood.

Purpose of the Study:

  • To characterize Alu retrotransposition patterns in eight human genomes using next-generation sequencing.
  • To identify novel Alu insertion events and analyze their distribution across different human populations.

Main Methods:

  • Utilized a rapid read-pair analysis algorithm to detect Alu insertions.
  • Employed experimental validation for a subset of identified insertions.
  • Developed a computational screen to identify ancestry-informative Alu events.

Main Results:

  • Discovered 4342 Alu insertions absent in the human reference genome, with 98% experimental validation.
  • Identified that 89% of new insertions are AluY elements, indicating recent retrotransposition.
  • Found 80% of Alu insertions were previously unreported, with higher detection rates in African (76%) versus non-African (69%) samples.

Conclusions:

  • The study reveals a substantial number of novel Alu insertion sites, expanding the understanding of human genetic variation.
  • Alu retrotransposition patterns exhibit population-specific differences, particularly highlighting a higher frequency of novel events in African populations.
  • Developed tools for identifying ancestry-informative Alu insertions, aiding in population genetics research and human evolutionary studies.