High-throughput linkage analysis of Mutator insertion sites in maize

Area of Science:

• Genomics
• Plant Biology
• Molecular Biology

Background:

• Insertional mutagenesis using high-copy transposable elements like Mutator (Mu) is vital for functional genomics.
• Identifying the specific Mu element responsible for a mutation is difficult, hindering research despite large mutant collections.

Purpose of the Study:

• To develop a rapid method for assaying Mu insertions genetically linked to mutations of interest.
• To enable efficient analysis of single mutants and high-throughput screening of mutant collections.

Main Methods:

• Combines MuTAIL (thermal asymmetrically interlaced) and AIMS (amplification of insertion mutagenized sites) protocols.
• Involves DNA digestion, adapter ligation, and PCR with a fluorescently labeled Mu primer and TAIL cycling.
• Analysis of PCR products on a capillary sequencer, followed by cloning, sequencing, and PCR confirmation of candidate insertions.

Main Results:

• Successfully identified Mu insertion sites linked to seed-lethal mutations in maize.
• Achieved a preliminary success rate of nearly 50% in identifying linked Mu insertions.

Conclusions:

• The presented method offers a rapid and efficient way to assay Mu insertions linked to mutations.
• This technique is valuable for both single mutant analysis and high-throughput functional genomics studies in maize.