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Multi-species Conserved Sequences

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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.
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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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Related Experiment Video

Updated: Feb 24, 2026

Demonstration of the Sequence Alignment to Predict Across Species Susceptibility Tool for Rapid Assessment of Protein Conservation

Demonstration of the Sequence Alignment to Predict Across Species Susceptibility Tool for Rapid Assessment of Protein Conservation

Published on: February 10, 2023

Biological function in the twilight zone of sequence conservation.

Chris P Ponting¹

¹MRC Human Genetics Unit, The Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh, EH4 2XU, UK. Chris.Ponting@igmm.ed.ac.uk.

|August 18, 2017

Summary

Most DNA sequences with weak conservation, or

Area of Science:

Genomics
Evolutionary Biology
Molecular Biology

Background:

DNA sequence conservation across species often indicates functional importance.
Distinguishing functional sequences from neutral drift in regions of weak conservation is challenging.

Purpose of the Study:

To investigate the functionality of DNA sequences within the 'twilight zone' of weak conservation.
To apply principles of selective constraint and positive selection to identify functional sequences in this zone.

Main Methods:

Analysis of genomic data within species populations.
Application of selective constraint and positive selection principles.

Main Results:

Identified a 'twilight zone' of DNA sequences with weak conservation.

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Last Updated: Feb 24, 2026

Demonstration of the Sequence Alignment to Predict Across Species Susceptibility Tool for Rapid Assessment of Protein Conservation

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Published on: February 10, 2023

An Integrated Approach for Microprotein Identification and Sequence Analysis

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Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues

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Published on: July 14, 2015

Biochemical activity was observed in many twilight zone sequences.

However, most biochemically active twilight zone sequences were found to be non-functional.

Conclusions:

Weak DNA sequence conservation does not reliably predict functionality.
Most sequences in the 'twilight zone' are not under functional constraint.
Distinguishing functional from non-functional sequences requires population-level genomic analysis.