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Related Concept Videos

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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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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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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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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
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Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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Related Experiment Video

Updated: Jan 11, 2026

Phloem Sap Sampling from Brassica napus for 3D-PAGE of Protein and Ribonucleoprotein Complexes
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Pangenomic structural variant patterns reflect evolutionary diversification in Brassica napus.

Nazanin P Afsharyan1,2, Agnieszka A Golicz3, Rod J Snowdon4

  • 1Department of Plant Breeding, Justus Liebig University Giessen, Giessen, 35392, Germany. Nazanin.PesaranAfsharyan@zalf.de.

Genome Biology
|November 11, 2025
PubMed
Summary

Genome structural variations (SVs) drive Brassica napus diversification. This study reveals pangenomic SV patterns, highlighting their role in crop evolution and providing insights for breeding improved Brassica crops.

Keywords:
Intraspecific diversificationOilseed rapeRapeseedStructural variationSwede

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Area of Science:

  • Genomics
  • Plant Biology
  • Evolutionary Biology

Background:

  • Genetic diversity is key to improving crop productivity.
  • Brassica napus is a globally important allopolyploid crop with significant intraspecific and ecogeographical diversification.
  • Understanding genome structural variation (SV) is crucial for crop improvement.

Purpose of the Study:

  • To explore species-wide genome structural variation (SV) in Brassica napus.
  • To investigate the role of SVs in intraspecific and ecogeographical diversification.
  • To identify SV patterns and their functional relevance for crop breeding.

Main Methods:

  • Whole-genome long-read DNA sequencing of 94 Brassica napus accessions.
  • Construction of reference-guided genome assemblies.
  • Pangenomic analysis of SVs, including insertions, deletions, inversions, and large chromosomal variations.

Main Results:

  • Pangenome-wide patterns of SVs (insertions, deletions, inversions, large chromosomal variations) were identified, reflecting diversification across morphotypes and ecotypes.
  • SV distribution was uneven, biased toward subgenome A, with asymmetrical selection favoring subgenome C.
  • Specific SVs and inversions were linked to genes involved in organ development, cell division, and stress responses, distinguishing crop types like swede and oilseed rape.

Conclusions:

  • Pangenomic SV formation plays a significant functional and evolutionary role in Brassica napus diversification.
  • Identified SV patterns offer insights for developing molecular markers in Brassica breeding.
  • This research aids in optimizing the performance of Brassica napus and related crops.