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Related Experiment Video

Updated: May 13, 2025

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Citrus genomes: past, present and future.

Upuli Nakandala1,2, Agnelo Furtado1,2, Robert J Henry1,2

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Recent advancements in genome sequencing have produced high-quality citrus genomes, aiding research and crop improvement. Further pangenome studies are needed to fully leverage genomic data for citrus breeding.

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Area of Science:

  • Genomics
  • Plant Science
  • Bioinformatics

Background:

  • Genome sequencing and assembly technologies have significantly advanced over the last decade.
  • This has led to the successful assembly of numerous citrus genomes, including wild, domesticated, and related species.
  • Improvements in sequencing technologies have enhanced genome completeness, contiguity, quality, and accuracy.

Purpose of the Study:

  • To review the evolution of sequencing, assembly, and annotation technologies for citrus genomes over the past 11 years.
  • To provide a comprehensive evaluation of the quality, contiguity, and completeness of available citrus genome assemblies.
  • To summarize major findings and applications derived from citrus genome research.

Main Methods:

  • Review of scientific literature on citrus genome sequencing and assembly.
  • Analysis of publicly available citrus genome data, focusing on assembly quality metrics (completeness, contiguity).
  • Evaluation of annotation completeness using metrics like BUSCO (Benchmarking Universal Single-Copy Orthologs).

Main Results:

  • Fifty citrus genomes are now available, with 35 at chromosome level and 15 at draft level; 14 are haplotype-resolved.
  • Recent long-read sequencing technologies achieve >99% assembly and >98% annotation completeness (BUSCO).
  • Early genome assemblies exhibit lower quality and would benefit from re-sequencing.

Conclusions:

  • High-quality citrus genome assemblies are crucial for advancing citrus genomics.
  • Haplotype-resolved pangenome studies with a broader species and genotype range are essential for maximizing the benefits of citrus genomics for crop improvement.
  • Continued technological advancements will further enhance our understanding of citrus genetics and facilitate breeding efforts.