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Related Concept Videos

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...
Modern Molecular Taxonomy01:29

Modern Molecular Taxonomy

Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
Uncertainty: Overview00:59

Uncertainty: Overview

In analytical chemistry, we often perform repetitive measurements to detect and minimize inaccuracies caused by both determinate and indeterminate errors. Despite the cares we take, the presence of random errors means that repeated measurements almost never have exactly the same magnitude. The collective difference between these measurements - observed values - and the estimated or expected value is called uncertainty. Uncertainty is conventionally written after the estimated or expected value.
Propagation of Uncertainty from Systematic Error01:10

Propagation of Uncertainty from Systematic Error

The atomic mass of an element varies due to the relative ratio of its isotopes. A sample's relative proportion of oxygen isotopes influences its average atomic mass. For instance, if we were to measure the atomic mass of oxygen from a sample, the mass would be a weighted average of the isotopic masses of oxygen in that sample. Since a single sample is not likely to perfectly reflect the true atomic mass of oxygen for all the molecules of oxygen on Earth, the mass we obtain from this particular...

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Related Experiment Video

Updated: Jul 8, 2026

An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
10:17

An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations

Published on: November 3, 2010

Alignment uncertainty and genomic analysis.

Karen M Wong1, Marc A Suchard, John P Huelsenbeck

  • 1Section of Ecology, Behavior and Evolution, University of California, San Diego, La Jolla, CA 92093, USA.

Science (New York, N.Y.)
|January 26, 2008
PubMed
Summary
This summary is machine-generated.

Statistical methods for genomic data analysis overlook sequence alignment uncertainty. This can cause different alignment methods to yield conflicting conclusions in comparative genomics studies.

Related Experiment Videos

Last Updated: Jul 8, 2026

An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
10:17

An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations

Published on: November 3, 2010

Area of Science:

  • Genomics
  • Bioinformatics
  • Computational Biology

Background:

  • Current statistical methods for genomic data analysis assume sequence alignments are accurate.
  • This assumption is often violated in comparative genomics, where thousands of genes are analyzed, many of which are difficult to align.

Purpose of the Study:

  • To investigate the impact of sequence alignment uncertainty on comparative genomics analyses.
  • To demonstrate how this uncertainty can affect study conclusions.

Main Methods:

  • Utilized genomic data from seven yeast species.
  • Applied standard statistical methods for genomic data analysis.

Main Results:

  • Sequence alignment uncertainty was shown to introduce significant problems in comparative genomics.
  • Different alignment methods produced divergent conclusions when applied to the same dataset.

Conclusions:

  • It is crucial to account for sequence alignment uncertainty in comparative genomics.
  • Ignoring this uncertainty can lead to unreliable or contradictory findings.