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Related Concept Videos

In-vitro Mutagenesis01:16

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Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
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Targeted Mutagenesis in Natural Apomicts.

Tatyana Radoeva1, Diana Rigola2, Rik H M Op den Camp2

  • 1Keygene N.V., Wageningen, The Netherlands. tatyana.radoeva@keygene.com.

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Summary

Scientists identified the Taraxacum officinale PARTHENOGENESIS (ToPAR) gene, crucial for clonal seeds in dandelions. This breakthrough in understanding apomixis could help identify similar genes in other plant species.

Keywords:
ApomixisCRISPR/Cas9Genome editingParthenogenesisTaraxacumTargeted mutagenesis

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Area of Science:

  • Plant reproductive biology
  • Genetics and genomics
  • Evolutionary biology

Background:

  • Apomixis, or clonal reproduction via seeds, is rare (0.1% of species) and evolves independently.
  • Identifying apomixis genes is difficult due to polyploidy and low-recombination regions in apomictic plants.
  • Previous genetic studies have unraveled the basis of apomixis in only a few plant genera.

Purpose of the Study:

  • To identify the specific gene responsible for apomixis in the triploid apomictic dandelion (Taraxacum officinale).
  • To investigate the genetic mechanisms underlying apomixis, a form of asexual reproduction through seeds.
  • To develop and apply methods for identifying apomixis genes in challenging plant systems.

Main Methods:

  • Utilized CRISPR/Cas9 targeted mutagenesis in triploid apomictic dandelions.
  • Combined conventional genetic mapping, deletion mapping, and haplotype assembly of apomixis loci.
  • Focused on identifying the gene controlling embryogenesis without fertilization.

Main Results:

  • Successfully identified the Taraxacum officinale PARTHENOGENESIS (ToPAR) gene.
  • The ToPAR gene is confirmed to be responsible for embryogenesis in the absence of fertilization.
  • Demonstrated the effectiveness of targeted mutagenesis for apomixis gene discovery.

Conclusions:

  • The ToPAR gene is a key factor in apomixis in Taraxacum officinale.
  • Targeted mutagenesis is a powerful tool for identifying apomixis genes in polyploid species.
  • The methodologies employed can be applied to discover novel apomixis genes in other plant lineages.