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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.
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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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Intelligence is often thought to be linked to brain size, but the relationship is more complex than that. While brain size does correlate modestly with some abilities, like verbal skills, the connection is weaker for others, such as spatial reasoning. Other factors, like brain structure, also play crucial roles. For instance, despite Einstein's smaller-than-average brain, his parietal cortex, which is involved in spatial reasoning, was 15% wider, suggesting that neural density might matter...
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Updated: Apr 19, 2026

Mapping Alzheimer's Disease Variants to Their Target Genes Using Computational Analysis of Chromatin Configuration
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Variations in brain DNA.

Jesús Avila1, Alberto Gómez-Ramos1, Eduardo Soriano2

  • 1Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas (CIBERNED), ISCIII Madrid, Spain ; Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Neurobiology Laboratory Madrid, Spain.

Frontiers in Aging Neuroscience
|December 16, 2014
PubMed
Summary
This summary is machine-generated.

Somatic DNA variations challenge the assumption of DNA sequence conservation across all cell types within an individual. This review explores DNA mutations in specific cells, particularly the brain, questioning the dogma of DNA invariance.

Keywords:
Alzheimer diseaseDNASNVbrain diseasessequence analysissomatic mutations

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Area of Science:

  • Genetics
  • Molecular Biology
  • Neuroscience

Background:

  • Multicellular organisms, including humans, are generally assumed to have conserved DNA sequences across all cell types.
  • DNA from a single tissue, typically blood, is commonly used for genomic comparisons between individuals.
  • This approach is effective for familial diseases but inadequate for sporadic diseases with mutations in specific somatic cells.

Purpose of the Study:

  • To review somatic DNA variations within different tissues and cells of single individuals.
  • To critically evaluate the established dogma of DNA invariance between cell types.
  • To discuss the origins of single nucleotide somatic variations, with a focus on brain mutations.

Main Methods:

  • Literature review of studies investigating somatic DNA variations.
  • Analysis of research on DNA mutations in various human tissues, emphasizing the brain.
  • Discussion of mechanisms underlying the occurrence of somatic DNA variations.

Main Results:

  • Evidence suggests that DNA sequences can vary between different cell types within an individual.
  • Somatic mutations, particularly single nucleotide variations, are present in specific cells, notably in the brain.
  • The assumption of universal DNA conservation across all somatic cells may not hold true.

Conclusions:

  • The dogma of DNA invariance between cell types requires re-evaluation in light of somatic DNA variations.
  • Understanding somatic mutations is crucial for diagnosing sporadic diseases and comprehending cellular heterogeneity.
  • Further research is needed to elucidate the full extent and implications of somatic DNA variations, especially in neurological contexts.