Evaluation of multiplex capillary heteroduplex analysis: a rapid and sensitive mutation screening technique

Area of Science:

• Genetics
• Molecular Biology
• Medical Diagnostics

Background:

• Bardet-Biedl syndrome (BBS) is a genetically heterogeneous disorder with complex inheritance patterns.
• Previous mutation screening methods like direct sequencing are time-consuming and costly for large genes.
• A need exists for a more efficient and economical mutation detection assay for BBS.

Purpose of the Study:

• To adapt and validate heteroduplex analysis on a capillary-based DNA fragment analyzer for BBS mutation screening.
• To improve the sensitivity, resolution, and throughput of BBS mutation detection.
• To identify novel variants in BBS genes.

Main Methods:

• Heteroduplex analysis was adapted for the MegaBACE 1000 capillary electrophoresis system.
• Multiplexing of up to six PCR products per capillary was employed to increase sample throughput.
• The assay was validated using twelve known alterations in BBS1, BBS2, BBS4, and BBS6.

Main Results:

• The multiplex capillary heteroduplex analysis (MCHA) achieved a 100% detection rate for known alterations.
• MCHA significantly increased sample throughput compared to traditional sequencing methods.
• Four novel variants were identified: two in BBS2 and two in BBS4.

Conclusions:

• Multiplex capillary heteroduplex analysis (MCHA) is a highly sensitive, cost-effective, and efficient method for BBS mutation screening.
• This optimized assay facilitates faster diagnosis and potentially broader genetic screening for BBS.
• The identification of novel variants contributes to a better understanding of BBS genetic heterogeneity.