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Repetitive Sequence Barcode Probe for Karyotype Analysis in Tripidium arundinaceum
Jin Chai1,2, Ling Luo1,2, Zehuai Yu3
1National Engineering Research Center for Sugarcane, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
International Journal of Molecular Sciences
|June 24, 2022
Summary
Repetitive DNA sequences in the wild sugarcane relative *Tripidium arundinaceum* were used as barcode probes. This method successfully distinguished multiple chromosome types, aiding sugarcane breeding.
Area of Science:
- Plant genetics
- Molecular cytogenetics
- Genomics
Background:
- The wild sugarcane relative *Tripidium arundinaceum* is a valuable genetic resource for stress resistance in sugarcane breeding.
- Its complex genome and unclear basic cytogenetic information hinder its effective utilization.
- Repetitive sequences are key to understanding complex genomes and chromosome identification.
Purpose of the Study:
- To develop a cytogenetic analysis method for *Tripidium arundinaceum* using repetitive DNA sequences as barcode probes.
- To explore the chromosomal distribution of repetitive sequences in *T. arundinaceum*.
- To distinguish chromosome types and homologous chromosomes within *T. arundinaceum*.
Main Methods:
- Construction of a Cot-20 library to screen repetitive sequences from *T. arundinaceum*.
- Application of fluorescence in situ hybridization (FISH) with various repetitive sequence probes (e.g., Ea-0907, Ea-0098, 45S rDNA, Ea-0663, Ea-0267, EaCent, 5S rDNA, Ea-0265, Ea-0070).
- Repeated FISH experiments to differentiate homologous chromosomes based on repetitive sequence distribution.
Main Results:
- Successfully identified ten chromosome types of *T. arundinaceum* using specific barcode probes.
- Differentiated homologous chromosomes by analyzing the distribution of repetitive sequences.
- Combined probes enabled the distinction of 37 different chromosome types, indicating varied repetitive sequence distribution on homologous chromosomes.
- Repetitive sequences exhibit distinct chromosomal distributions, enabling precise chromosome identification.
Conclusions:
- Repetitive DNA sequences serve as effective barcode probes for molecular cytogenetics in *T. arundinaceum*.
- This FISH-based method provides a robust approach for distinguishing chromosome types and homologous chromosomes.
- The findings lay the groundwork for similar cytogenetic analyses in other complex plant genomes.
- This technique enhances the potential of *T. arundinaceum* as a genetic resource for sugarcane improvement.
