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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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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers.  Nondisjunction is common during anaphase I or anaphase II of meiosis.  Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold...
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Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
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In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
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Updated: Jan 10, 2026

In Situ Labeling of Mitochondrial DNA Replication in Drosophila Adult Ovaries by EdU Staining
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Haplodiploidy accelerates mitogenome evolution in insects.

Avas Pakrashi1, Ken A Thompson1, Paul D N Hebert1

  • 1University of Guelph, Centre for Biodiversity Genomics, Guelph, Ontario, Canada N1G 2W1.

Proceedings. Biological Sciences
|November 25, 2025
PubMed
Summary

Haplodiploidy (HD) in insects accelerates mitochondrial genome evolution, showing increased amino acid substitutions and indels compared to diplodiploidy (DD). This finding suggests a link between sex determination and evolutionary rates in insect mitogenomes.

Keywords:
COIDNA barcodingmito-nuclear interactionsmolecular evolutionploidyrate acceleration

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Area of Science:

  • Evolutionary Biology
  • Genomics
  • Entomology

Background:

  • Mitochondrial genome evolution rates vary across animal lineages.
  • Sex determination systems, like haplodiploidy (HD) and diplodiploidy (DD), may influence these evolutionary rates.
  • Insects offer a model system as HD has evolved multiple times from a DD ancestor.

Purpose of the Study:

  • To investigate if haplodiploid (HD) insect lineages exhibit different rates of mitochondrial genome evolution compared to diplodiploid (DD) lineages.
  • To test for differences in amino acid substitutions and indel frequencies in the COI gene between HD and DD taxa.

Main Methods:

  • Analysis of the cytochrome c oxidase subunit I (COI) gene barcode region (658 bp) from over 86,000 BINs (species proxy).
  • Comparison of sequence changes, including amino acid substitutions and indels, between 10 known HD insect lineages and related DD lineages.
  • Phylogenetic analysis to account for evolutionary relationships between taxa.

Main Results:

  • Haplodiploid (HD) insect lineages showed significantly higher rates of amino acid substitution (1.7×) compared to diplodiploid (DD) lineages.
  • The ratio of non-synonymous to synonymous substitutions (Ka/Ks) was 3.5× higher in HD lineages.
  • HD lineages exhibited a substantially greater frequency of insertions and deletions (indels) in the COI gene.

Conclusions:

  • Haplodiploidy (HD) accelerates mitochondrial genome evolution in insects.
  • The study provides evidence for a link between sex determination systems and the rate of molecular evolution.
  • Further research is needed to elucidate the mechanistic basis, potentially involving coevolution between mitochondrial and nuclear genomes.