PKD1 Exon Sequencing Using Long-Range PCR to Avoid Pseudogenes
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Solution Overview
Problem
PKD1 gene screening is challenging due to its large size, allelic heterogeneity, high GC content, and the presence of six highly homologous pseudogenes, which complicates proper amplification of exons.
Innovation Solution
A method involving long-range PCR and target-enrichment PCR is employed to amplify and sequence PKD1 gene exons, using specific primers and probes to avoid pseudogenes, followed by purification, pooling, and shearing steps to enhance sequencing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If long-range PCR is used to amplify all 46 exons of PKD1, then complete gene coverage is achieved, but amplification accuracy deteriorates due to pseudogene interference
Solution Approach 1:
The PKD1 gene is divided into multiple exon groups (e.g., exons 1-10, 11-20, 21-30, 31-46) that are amplified separately using group-specific primers. This segmentation prevents pseudogene amplification while ensuring complete coverage of all functional exons through systematic grouping.
Solution Approach 2:
Group-specific primers act as intermediaries that selectively bind to unique sequences in functional PKD1 exons while avoiding pseudogene sequences. These primers serve as mediators between the amplification process and the target gene, enabling accurate discrimination between functional exons and pseudogenes.
2Manufacturing precision
If traditional PCR is used to avoid pseudogenes, then amplification specificity is improved, but gene coverage is insufficient due to large gene size
Solution Approach 1:
The large PKD1 gene is segmented into multiple smaller exon groups, each amplified by traditional PCR with group-specific primers. This segmentation maintains amplification specificity while ensuring complete coverage by systematically addressing all 46 exons across multiple targeted amplification reactions.
Solution Approach 2:
Multiple partial amplification reactions are performed, each covering a specific exon group, to achieve complete gene coverage. The excessive action of performing more amplification reactions than a single PCR would allow ensures no exons are missed while maintaining high specificity through group-specific primer design.
3Measurement precision
If multiple PCR reactions are performed to cover all exons, then sequencing coverage is improved, but process complexity increases
Solution Approach 1:
Multiple PCR products from different exon groups are merged into a single pool for simultaneous sequencing. This merging reduces sequencing process complexity while maintaining comprehensive coverage, as all exon groups are analyzed in one sequencing run rather than individually.
Solution Approach 2:
Universal primers or adapter sequences are incorporated into all group-specific PCR products, enabling them to be processed through a common sequencing pipeline. This multi-functionality allows different exon groups to be amplified with specific primers but then universally prepared and sequenced using the same methodology.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively amplifies and sequences the PKD1 gene exons while minimizing pseudogene interference, improving screening efficiency and accuracy.
Implementation Method 1
The long-range PCR may comprise contacting the PKD1 gene with a plurality of primers comprising the nucleic acid sequences of SEQ ID NOs: 9-10, 15-16, and 19-24
Implementation Method 2
amplifying exons 1-46 of a PKD1 gene using long-range PCR to form a plurality of long-range PCR products
Implementation Method 3
The target-enrichment PCR may comprise contacting the PKD1 gene with a plurality of probes that hybridize to exons 34-46
Data Source
AI summary
Disclosed herein is a method for sequencing a PKD1 gene. The method may comprise amplifying exons 1-46 of the PKD1 gene using long-range PCR to form a plurality of long-range PCR products; and sequencing the plurality of long-range PCR products. Alternatively, the method may comprise amplifying exons 1-33 of the PKD1 gene using long-range PCR to form a plurality of long-range PCR products; amplifying exons 34-46 of the PKD1 gene by target-enrichment PCR to form a plurality of target-enrichment PCR products; and sequencing the plurality of long-range PCR products and the plurality of target-enrichment PCR products. Also disclosed herein are compositions, kits, and systems comprising primers and/or probes for performing the methods recited herein.