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Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations

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Haplotype mining panel for genetic dissection and breeding in Eucalyptus.

Julia Candotti¹, Nanette Christie¹, Raphael Ployet¹

¹Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, South Africa.

The Plant Journal : for Cell and Molecular Biology

|November 17, 2022

Summary

A new haplotype mining panel for Eucalyptus improves genetic analysis by revealing extensive haplotype diversity. This tool provides multi-allelic markers for advanced breeding and understanding complex plant traits.

Keywords:

Eucalyptus gene-centric genotyping haplotype multi-allelic markers

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Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry

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Published on: June 21, 2018

Area of Science:

Plant genetics and genomics
Forestry and tree breeding

Background:

Understanding complex traits in plants like Eucalyptus requires comprehensive gene variant analysis.
Current molecular breeding in Eucalyptus relies on single-nucleotide polymorphism (SNP) markers, which inadequately capture haplotype diversity in highly outbred species.

Purpose of the Study:

To develop a gene-based haplotype mining panel for Eucalyptus species.
To enable the analysis of multi-allelic markers for improved trait dissection and molecular breeding.

Main Methods:

Generated 17,999 oligonucleotide probe sets for targeted sequencing of 6,293 genes related to growth, wood properties, resistance, and stress responses.
Identified and phased 195,834 SNPs using a read-based phasing approach to reveal SNP-based haplotypes.
Validated the panel across four Eucalyptus species (E. grandis, E. urophylla, E. dunnii, E. nitens).

Main Results:

8,915 target regions (at 4,637 gene loci) demonstrated Mendelian inheritance.
The panel captured an average of 3.13-4.52 haplotypes per target region in each species.
33.36% of identified haplotypes were shared across at least two Eucalyptus species.

Conclusions:

The developed haplotype mining panel effectively captures genetic diversity within and between Eucalyptus species.
This panel provides valuable multi-allelic markers for genome-wide association studies and gene-based breeding strategies in Eucalyptus.