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Related Concept Videos

Comparing Copy Number Variations and SNPs02:26

Comparing Copy Number Variations and SNPs

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%...
Genetic Variation01:25

Genetic Variation

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.
Genes exist in different versions called alleles, which...
Single Nucleotide Polymorphisms-SNPs01:05

Single Nucleotide Polymorphisms-SNPs

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,...
Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
Genomics02:02

Genomics

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...
Genomic DNA in Eukaryotes00:58

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.

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Detection of Rare Genomic Variants from Pooled Sequencing Using SPLINTER
14:06

Detection of Rare Genomic Variants from Pooled Sequencing Using SPLINTER

Published on: June 23, 2012

Nine things to remember about human genome diversity.

G Barbujani1, S Ghirotto, F Tassi

  • 1Department of Life Sciences and Biotechnologies, University of Ferrara, Ferrara, Italy.

Tissue Antigens
|September 17, 2013
PubMed
Summary

Humans exhibit minimal genetic variation, making them the least genetically diverse primate. This genetic uniformity across populations underscores the need to move beyond racial categorization towards personalized medicine.

Keywords:
FSTadmixturegene flowgenetic drifthuman originshuman racespharmacogenomicspopulation structure

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Area of Science:

  • Human Genetics
  • Population Genomics
  • Evolutionary Biology

Background:

  • Understanding human biological differences is crucial for interpreting vast genomic data.
  • Genomic data reveals humans are the least genetically variable primate species.
  • Individual genomes are mosaics, and population differences show geographical patterns.

Purpose of the Study:

  • To review evidence on human genetic variation and its implications.
  • To discuss the African origin of humans and global population dynamics.
  • To argue against the utility of racial categorization in favor of personalized medicine.

Main Methods:

  • Comparative analysis of genomic data from human individuals and populations.
  • Examination of geographical patterns in genetic variation.
  • Review of historical and current approaches to human biological classification.

Main Results:

  • Humans display remarkably low genetic variation compared to other primates.
  • Genetic diversity within populations is substantial, exceeding differences between populations.
  • Geographical patterns in genetic variation support an African origin and human migration history.
  • Limited geographical restriction of alleles and allele combinations across populations.

Conclusions:

  • Racial categorization is biologically unfounded due to extensive human genetic similarity and allele sharing.
  • Racial labels can obscure critical patient differences and hinder medical advancements.
  • Advancements in genotyping enable personalized medicine, rendering traditional racial classifications obsolete.