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Improving linkage analysis in outcrossed forest trees - an example from Acacia mangium
A. Butcher1, R. Williams, D. Whitaker
1CSIRO Forestry and Forest Products, P.O. Box E4008, Kingston, ACT 2604, Australia, Penny.Butcher@csiro.au
Summary
A new software package, OUTMAP, improves genetic mapping in forest trees by accurately ordering markers in outcrossed pedigrees. This tool enhances efficiency and map accuracy compared to existing methods like JOINMAP.
Area of Science:
- Forestry
- Genetics
- Bioinformatics
Background:
- Genetic mapping in forest trees typically uses outbred pedigrees, with segregation from both parents.
- Existing mapping software struggles with phase-ambiguous data and pairwise information in outcrossed pedigrees.
Purpose of the Study:
- Introduce OUTMAP, a novel package for mapping codominant loci in outcrossed trees.
- Evaluate OUTMAP's performance against JOINMAP using Acacia mangium linkage data.
Main Methods:
- Developed the OUTMAP software package for genetic mapping.
- Applied OUTMAP and JOINMAP to linkage data from two Acacia mangium pedigrees.
- Compared marker order likelihood, efficiency, and genome length estimation.
Main Results:
- OUTMAP produced marker orders with higher likelihood than JOINMAP.
- OUTMAP offered greater efficiency, reducing data recoding and manual investigation.
- Marker distances varied, leading to increased estimated genome length with OUTMAP.
Conclusions:
- OUTMAP provides a more efficient and accurate solution for genetic mapping in outcrossed forest trees.
- The software supports all segregation types for phase determination and order likelihood calculation.
- OUTMAP enhances genetic map resolution and genome size estimation in tree species.