Related Experiment Video
Updated: Feb 2, 2026
09:15
Embryo Rescue Protocol for Interspecific Hybridization in Squash
Published on: September 12, 2022
3.3K
Recombination and Large Structural Variations Shape Interspecific Edible Bananas Genomes
Franc-Christophe Baurens1,2, Guillaume Martin1,2, Catherine Hervouet1,2
1CIRAD, UMR AGAP, F-34398 Montpellier, France.
Molecular Biology and Evolution
|November 8, 2018
Summary
Banana genome evolution involves admixture and polyploidization, leading to mosaic genomes in edible bananas. Interspecific recombination and structural variations explain these complex genomic structures and their impact on evolution.
Area of Science:
- Genomics
- Plant Biology
- Evolutionary Biology
Background:
- Eukaryotic genome evolution is shaped by admixture and polyploidization.
- Banana cultivars are interspecific hybrids of Musa acuminata (A genome) and M. balbisiana (B genome), often triploid with low fertility.
- Understanding genome dynamics in polyploid hybrids is crucial for evolutionary insights.
Purpose of the Study:
- To characterize A and B chromosome composition in diploid and triploid banana cultivars.
- To compare chromosome structures between A and B genomes.
- To analyze A/B chromosome segregation in a polyploid context.
Main Methods:
- Next-generation sequencing (NGS) data analysis.
- Characterization of chromosome composition and structure.
- Analysis of recombination and segregation patterns.
Main Results:
- Frequent interspecific recombination between A and B chromosomes was observed.
- Two large structural variations (reciprocal translocation and inversion) were identified between A and B genomes.
- These variations locally affected recombination, leading to segregation distortion and aneuploidy in triploid progeny.
Conclusions:
- Interspecific recombination and structural variations explain the mosaic genomes of edible bananas.
- This study provides high-resolution insights into banana genome structure, aiding in revisiting cultivar origins.
- Findings offer new perspectives on the impact of interspecificity on genome evolution and facilitate breeding strategies.
Related Concept Videos
02:53Conservative Site-specific Recombination and Phase Variation
6.8K
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
6.8K
01:26Size and Structure of Viral Genomes
786
Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
786
00:57Viral Recombination
25.1K
Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
25.1K
02:31Homologous Recombination
63.0K
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
63.0K
01:14What is Variation?
18.5K
Apart from the measures of central tendency, distribution, outliers, and the changing characteristics of data with time, an important characteristic of any data set is its variation or spread. In some data sets, the data values are concentrated closely near the mean; in others, the data values are more widely spread out from the mean.
The range, standard deviation, standard error, and variance are the different measures of variation.
Range: The range is the difference between its maximum and...
The range, standard deviation, standard error, and variance are the different measures of variation.
Range: The range is the difference between its maximum and...
18.5K
02:13Overview of Transposition and Recombination
19.3K
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...
19.3K