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Related Concept Videos

Animal Mitochondrial Genetics02:59

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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Investigating Human Mitochondrial Genomes in Single Cells.

Maria Angela Diroma1, Angelo Sante Varvara2, Marcella Attimonelli2

  • 1Institute of Biomembranes, Bioenergetics and Molecular Biotechnologies (IBIOM), National Research Council, Via Giovanni Amendola 118, 70126 Bari, Italy.

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|May 15, 2020
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Summary

Researchers developed a computational pipeline to reconstruct mitochondrial DNA (mtDNA) genomes from single cells. This method enables the study of cellular heterogeneity in various biological processes, including cancer evolution and development.

Keywords:
mtDNAscWGSsingle-cell

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Area of Science:

  • Genomics
  • Cell Biology
  • Evolutionary Biology

Background:

  • Mitochondrial DNA (mtDNA) is crucial for understanding eukaryotic cell evolution and inherited diseases.
  • Whole genome and exome sequencing allow high-resolution study of mtDNA mutations and their links to phenotypes.
  • Acquired mtDNA mutations are implicated in diseases, aging, and cancer.

Purpose of the Study:

  • To develop and validate a computational pipeline for reconstructing mtDNA genomes from single-cell sequencing data.
  • To assess the suitability of different whole genome and exome amplification methods for mtDNA analysis.
  • To enable the study of mtDNA in the context of cellular heterogeneity.

Main Methods:

  • Application of a custom computational pipeline (MToolBox) for mtDNA genome reconstruction.
  • Analysis of whole genome sequencing (WGS) and whole exome sequencing (WES) data from single cells.
  • Inclusion of data from various amplification techniques (eWGA, DOP-PCR, MALBAC, MDA) and scATAC-seq.

Main Results:

  • The MToolBox pipeline successfully reconstructed mtDNA genomes from diverse single-cell sequencing data.
  • Assembled mtDNAs were found to be uniform and suitable for genomic investigation, except for those from MALBAC and DOP-PCR methods.
  • The method facilitates the study of mtDNA in relation to cellular heterogeneity.

Conclusions:

  • The developed computational pipeline provides a robust method for single-cell mtDNA genome reconstruction.
  • This approach is valuable for investigating cellular heterogeneity in processes like tumor evolution, neural somatic mosaicism, and embryonic development.
  • The findings highlight the potential of single-cell mtDNA analysis for advancing our understanding of various biological and pathological conditions.