Internal and flanking sequence from AFLP fragments using ligation-mediated suppression PCR

Area of Science:

• Molecular Biology
• Genetics
• Bioinformatics

Background:

• Amplification Fragment-Length Polymorphism (AFLP) analysis is crucial for generating numerous genetic markers.
• Characterizing AFLP markers with internal and flanking sequence data is often necessary.
• Existing methods for AFLP marker characterization can be laborious.

Purpose of the Study:

• To develop a systematic and efficient protocol for obtaining internal and flanking sequence information from AFLP markers.
• To enable detailed genetic characterization of AFLP markers across various organisms.
• To streamline the process of sequence analysis for AFLP fragments.

Main Methods:

• AFLP fragments are isolated from stored polyacrylamide sequencing gels.
• Isolated fragments are amplified via PCR and subjected to sequence analysis.
• Locus-specific primers are designed from internal sequences to amplify flanking regions using adapter primers in restriction-ligation (R-L) reactions.

Main Results:

• The protocol allows for the amplification of unknown flanking regions from numerous R-L reactions.
• Many reactions yield products suitable for direct sequencing without nested PCR, extensive purification, or subcloning.
• The method was successfully demonstrated with a variable AFLP fragment from Bacillus anthracis.

Conclusions:

• This systematic approach provides an efficient way to obtain sequence information for AFLP markers.
• The method reduces the need for complex downstream processing like nested PCR or subcloning.
• This technique enhances the utility of AFLP markers for genetic studies and characterization.