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The Evidence for Evolution02:55

The Evidence for Evolution

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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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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.
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The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
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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.
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A Practical Guide to Phylogenetics for Nonexperts
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Phylogenetic Reconstruction for Copy-Number Evolution Problems.

Ruofan Xia, Yu Lin, Jun Zhou

    IEEE/ACM Transactions on Computational Biology and Bioinformatics
    |July 12, 2018
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel phylogenetic method to analyze cancer evolution using copy-number profiles. The approach accurately reconstructs tumor phylogenies and estimates evolutionary events, aiding in understanding cancer progression.

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    Area of Science:

    • Genomics
    • Computational Biology
    • Cancer Research

    Background:

    • Cancer is characterized by heterogeneity and evolves through somatic mutations and clonal expansions.
    • Phylogenetic analysis of cancer cell subclones aids in studying tumor variant progression.
    • Copy-number aberrations (segmental amplifications/deletions) are common in tumors.

    Purpose of the Study:

    • To develop a distance-based method for reconstructing cancer cell phylogenies from copy-number profiles.
    • To demonstrate the importance of distance correction for accurately estimating evolutionary events.

    Main Methods:

    • Developed a novel distance-based method for phylogenetic reconstruction.
    • Applied distance correction to account for the actual number of evolutionary events.
    • Utilized copy-number profiles of cancer cells as input data.

    Main Results:

    • The developed method accurately estimates the number of evolutionary events between copy-number profiles.
    • Accurate phylogenetic trees were reconstructed from cancer cell data.
    • The approach demonstrated scalability for analyzing complex tumor evolutionary histories.

    Conclusions:

    • The proposed method offers an accurate and scalable approach for phylogenetic reconstruction in cancer.
    • Distance correction is crucial for reliable estimation of evolutionary events in cancer genomics.
    • This work advances the understanding of tumor heterogeneity and progression through evolutionary modeling.