Sequence-indexed mutations in maize using the UniformMu transposon-tagging population.

Area of Science:

• Plant genomics
• Functional genomics
• Maize genetics

Background:

• Gene knockouts are essential for understanding gene function.
• Flanking Sequence Tags (FSTs) map insertion mutants to specific genomic loci.
• Transposon-based FSTs in maize can present challenges with unstable or somatic insertions.

Purpose of the Study:

• To validate the stability and germinal inheritance of maize UniformMu FSTs.
• To assess the utility of FSTs for reverse genetic analysis in maize.
• To confirm the UniformMu population as a genome-wide resource for maize functional genomics.

Main Methods:

• Locus-specific PCR was used to test the inheritance of 106 UniformMu FSTs.
• Analysis of insertion site stability and segregation in subsequent generations.
• Identification of gene knockouts co-segregating with mutant phenotypes.

Main Results:

• 89% of tested FSTs represented stable, germinal transposon insertions.
• Errors in primer design, not somatic insertions, accounted for unconfirmed sites.
• A knockout of 6-phosphogluconate dehydrogenase was identified, linked to a seed mutant phenotype.

Conclusions:

• Maize UniformMu FSTs are reliable markers for stable, germinal insertion sites.
• Sequence-indexed mutations from UniformMu are suitable for reverse genetics.
• The UniformMu collection provides a valuable genome-wide resource for maize reverse genetics.