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Related Concept Videos

Evolutionary Relationships through Genome Comparisons02:54

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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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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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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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The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
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Related Experiment Video

Updated: Apr 24, 2026

The ITS2 Database
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ITS1: a DNA barcode better than ITS2 in eukaryotes?

Xin-Cun Wang1, Chang Liu, Liang Huang

  • 1Institute of Medicinal Plant Development, Chinese Academy of Medical Science, 151 MaLianWa North Road, Beijing, 100193, China.

Molecular Ecology Resources
|September 5, 2014
PubMed
Summary

The internal transcribed spacer 1 (ITS1) is a superior DNA barcode compared to ITS2 for eukaryotic species identification. ITS1 demonstrates higher species discrimination efficiency and better primer universality, making it more effective for biodiversity studies.

Keywords:
DNA barcodeinternal transcribed spacer 1internal transcribed spacer 2meta-analysisspecies identification

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biodiversity Studies

Background:

  • DNA barcoding utilizes short DNA sequences for species identification.
  • The internal transcribed spacer (ITS) region, comprising ITS1 and ITS2, is a candidate standard for fungi and plants.
  • ITS has been applied to diverse eukaryotic groups, including algae, protists, and animals.

Purpose of the Study:

  • To conduct a large-scale meta-analysis comparing ITS1 and ITS2 as DNA barcodes.
  • To evaluate ITS1 and ITS2 based on PCR amplification, DNA sequencing, and species discrimination.
  • To determine the optimal ITS region for eukaryotic species barcoding.

Main Methods:

  • Meta-analysis of 85,345 sequence pairs across 10 eukaryotic groups.
  • Assessment of DNA barcoding gaps, species discrimination efficiency, sequence length, GC content, and primer universality.
  • In silico PCR amplification evaluation and statistical analysis (Fisher's exact test).

Main Results:

  • ITS1 exhibited significantly higher species discrimination efficiency than ITS2 in numerous families and genera.
  • ITS1 primers showed superior universality for PCR amplification compared to ITS2 primers.
  • ITS1 offers advantages in sequencing due to shorter amplification product length and lower GC content.

Conclusions:

  • ITS1 is a more effective DNA barcode than ITS2 for eukaryotic species.
  • The findings support the use of ITS1 as a standard for broad eukaryotic barcoding applications.
  • ITS1's performance characteristics enhance its utility in biodiversity and species discovery.