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Related Concept Videos

Genetic Variation01:25

Genetic 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.
Genes exist in different versions called alleles,...
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Chromatin Packaging02:21

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Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order...
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Inheritance of Chromatin Structures03:17

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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Polygenic Traits01:18

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When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...
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Trait and State Self-Esteem02:08

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The term self-esteem is often used generically, to refer to how people feel about themselves. However, according to research, there are three distinct constructs that should not be used interchangeably (Brown & Marshall, 2006). 
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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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Related Experiment Video

Updated: Feb 8, 2026

Mapping Genome-wide Accessible Chromatin in Primary Human T Lymphocytes by ATAC-Seq
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Expanded chromatin accessibility mapping explains genetic variation associated with complex traits in liver.

Brandon M Wenz1, Max F Dudek2, Shweta Ramdas3

  • 1Genetics and Epigenetics Program, Cell and Molecular Biology Graduate Group, Biomedical Graduate Studies, University of Pennsylvania - Perelman School of Medicine, Philadelphia, PA, USA.

American Journal of Human Genetics
|February 6, 2026
PubMed
Summary

This study uses ATAC-seq to map chromatin accessibility in human livers, identifying thousands of regulatory elements and caQTLs. Integrating this with GWAS data provides molecular mechanisms for complex traits, revealing that 20% of blood lipid signals lack a clear genetic link.

Keywords:
cholesterolchromatin accessibilitycolocalizationgenetic architectureliverquantitative trait locus mapping

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Area of Science:

  • Genomics
  • Molecular Biology
  • Human Genetics

Background:

  • Genome-wide association studies (GWAS) identify genetic loci for complex traits.
  • Chromatin accessibility studies aim to find regulatory elements influencing gene expression.
  • Genetic variants affecting chromatin accessibility (caQTLs) can explain GWAS signals.

Purpose of the Study:

  • To investigate chromatin accessibility in human liver using ATAC-seq.
  • To identify caQTLs and their colocalization with GWAS signals for liver-relevant traits.
  • To assess the proportion of complex trait signals with proposed molecular mechanisms.

Main Methods:

  • Assay for transposase-accessible chromatin with sequencing (ATAC-seq) on 189 human liver samples.
  • Identification of accessible chromatin regions and caQTLs.
  • Integration of liver caQTLs, eQTLs, and blood lipid GWAS data.

Main Results:

  • Over 2 million accessible chromatin regions and over 14,000 caQTLs identified.
  • 157 loci showed colocalization between caQTLs, eQTLs, and GWAS signals.
  • Approximately 20% of blood lipid GWAS signals lacked a statistically supported mechanism.

Conclusions:

  • Integrating multi-omic QTL data enhances understanding of GWAS signals.
  • caQTLs provide mechanistic hypotheses for complex trait associations.
  • Further experimental approaches are needed to fully elucidate complex trait mechanisms.