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Related Concept Videos

Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
Synteny and Evolution02:31

Synteny and Evolution

John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral chromosome underwent...
Multi-species Conserved Sequences02:51

Multi-species Conserved Sequences

Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale  studies have provided new insights into the evolutionary relationship between organisms.
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved DNA...
Gene Duplication and Divergence02:37

Gene Duplication and Divergence

The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
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.
Convergent Evolution01:54

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...

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Related Experiment Video

Updated: Jun 13, 2026

An Integrated Approach for Microprotein Identification and Sequence Analysis
09:37

An Integrated Approach for Microprotein Identification and Sequence Analysis

Published on: July 12, 2022

Contrasts between adaptive coding and noncoding changes during human evolution.

Ralph Haygood1, Courtney C Babbitt, Olivier Fedrigo

  • 1Biology Department and Institute for Genome Sciences and Policy, Duke University, Durham, NC 27708, USA. ralph.haygood@gmail.com

Proceedings of the National Academy of Sciences of the United States of America
|April 14, 2010
PubMed
Summary
This summary is machine-generated.

Human evolution, particularly cognitive traits, is significantly shaped by changes in noncoding DNA. These regulatory DNA alterations drive neural development adaptation, contrasting with coding changes favoring immunity and reproduction.

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Screening for Functional Non-coding Genetic Variants Using Electrophoretic Mobility Shift Assay (EMSA) and DNA-affinity Precipitation Assay (DAPA)

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Last Updated: Jun 13, 2026

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09:37

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Published on: July 12, 2022

Visualizing Visual Adaptation
04:43

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Published on: April 24, 2017

Screening for Functional Non-coding Genetic Variants Using Electrophoretic Mobility Shift Assay (EMSA) and DNA-affinity Precipitation Assay (DAPA)
11:35

Screening for Functional Non-coding Genetic Variants Using Electrophoretic Mobility Shift Assay (EMSA) and DNA-affinity Precipitation Assay (DAPA)

Published on: August 21, 2016

Area of Science:

  • Evolutionary biology
  • Genomics
  • Human genetics

Background:

  • Non-protein-coding regulatory DNA sequences are increasingly recognized for their role in adaptive evolution.
  • Understanding the distinct contributions of coding and noncoding DNA changes to human adaptation is crucial.

Purpose of the Study:

  • To analyze correlations between gene functions and positive selection evidence across human genome sequences.
  • To differentiate the roles of coding versus noncoding DNA changes in human adaptive evolution, particularly for neural traits.

Main Methods:

  • Statistical framework applied to large-scale surveys of human coding and noncoding DNA sequences.
  • Correlation analysis integrating gene ontologies and gene expression data with evidence of positive selection.

Main Results:

  • Noncoding DNA changes are strongly correlated with neural development and function adaptation.
  • Coding DNA changes are predominantly linked to adaptations in immunity, olfaction, and male reproduction.
  • Tissue-specific genes show more adaptive coding changes, unlike broadly expressed genes, due to pleiotropic constraints.

Conclusions:

  • Noncoding DNA alterations are a major driver of human trait evolution, especially cognitive abilities.
  • Adaptive evolution in humans involves distinct mechanisms for coding and noncoding genetic changes.
  • Regulatory DNA evolution plays a critical, underappreciated role in shaping human uniqueness.