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Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
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Variability of Human rDNA.

Evgeny Smirnov1, Nikola Chmúrčiaková1, František Liška1

  • 1Institute of Biology and Medical Genetics, First Faculty of Medicine, Charles University and General University Hospital in Prague, Prague 128 00, Czech Republic.

Cells
|January 27, 2021
PubMed
Summary
This summary is machine-generated.

Human ribosomal DNA (rDNA) exhibits significant instability, leading to variations in repeat sequences and numbers within clusters. This variability impacts both normal cell function and disease development.

Keywords:
copy numberhuman rDNAmutationssequence variability

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Human ribosomal DNA (rDNA) is organized into ten tandem repeat clusters.
  • Each rDNA repeat comprises a ribosomal gene region and an intergenic spacer (IGS).
  • The standard rDNA structure is frequently altered due to inherent locus instability.

Purpose of the Study:

  • To review the causes, types, and detection methods of human rDNA instability.
  • To examine the distribution and biological significance of rDNA variability.
  • To explore mechanisms preventing or reversing rDNA instability.

Main Methods:

  • Literature review of studies on human rDNA instability.
  • Analysis of data on rDNA repeat sequence and copy number variation.
  • Discussion of methods for detecting and characterizing rDNA alterations.

Main Results:

  • Human rDNA locus is characterized by peculiar instability, causing high variability in repeat sequences and copy numbers.
  • Instability affects both the ribosomal part and the intergenic spacer (IGS) of rDNA repeats.
  • The distribution and biological significance of this variability are complex and not fully understood.

Conclusions:

  • RDNA variability is a significant feature of human cells, potentially linked to pathology.
  • This variability also plays a crucial, albeit poorly understood, role in normal cell physiology.
  • Further research is needed to elucidate the full impact of rDNA instability on health and disease.