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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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A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
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Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
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Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
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The Unique DNA Sequences Underlying Equine Centromeres.

Elena Giulotto1, Elena Raimondi2, Kevin F Sullivan3

  • 1Dipartimento di Biologia e Biotecnologie, Università di Pavia, Via Ferrata 1, 27100, Pavia, Italy. elena.giulotto@unipv.it.

Progress in Molecular and Subcellular Biology
|August 26, 2017
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Summary
This summary is machine-generated.

Centromeres can function without satellite DNA, as shown in horses. This discovery in equids highlights the epigenetic basis of centromere identity and offers a new model for studying centromere evolution.

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Area of Science:

  • Genetics
  • Epigenetics
  • Evolutionary Biology

Background:

  • Centromeres are crucial genetic loci, with function primarily determined by epigenetic mechanisms.
  • The repetitive nature of DNA sequences in animal centromeres complicates understanding their role.
  • Previous research suggested epigenetic factors, rather than DNA sequence, dictate centromere identity.

Purpose of the Study:

  • To investigate the role of DNA sequences in centromere function.
  • To explore the epigenetic basis of centromere identity in animals.
  • To establish equids as a model system for studying centromere organization and evolution.

Main Methods:

  • Analysis of centromere DNA composition in domestic horses.
  • Examination of centromere location and satellite DNA presence in various Equus species (donkeys, zebras).
  • Comparative genomic analysis to understand karyotype evolution.

Main Results:

  • Discovery of centromeres entirely devoid of satellite DNA in domestic horses.
  • Confirmation that satellite-less centromeres are common across Equus species, including donkeys and zebras.
  • Observation of variable centromere positions among individual horses.

Conclusions:

  • Centromere identity is largely epigenetic and can be established without satellite DNA.
  • Equids possess a unique system for studying centromere dynamics due to their satellite-less centromeres and rapid karyotype evolution.
  • This finding challenges traditional views on the necessity of satellite DNA for centromere function.