A single base pair polymorphism in the WT1 gene detected by single-strand conformation polymorphism analysis

Area of Science:

• Genetics
• Molecular Biology
• Oncology

Background:

• The Wilms' tumor gene (WT1) plays a crucial role in tumor predisposition.
• Genetic variations in WT1 can impact cancer development.
• Understanding WT1 mutations is vital for genetic analysis and risk assessment.

Purpose of the Study:

• To analyze the Wilms' tumor gene (WT1) exon-by-exon for variations.
• To identify and characterize any detected mutations within the WT1 gene.
• To assess the utility of a specific WT1 gene polymorphism for genetic studies.

Main Methods:

• Single-strand conformation polymorphism (SSCP) technique for exon analysis.
• DNA sequencing to identify the nature of genetic variations.
• Restriction enzyme analysis (AflIII) to detect the specific mutation.
• Family segregation analysis to determine inheritance patterns.

Main Results:

• A consistent variation was detected in exon 7 of the WT1 gene.
• A silent mutation (A-->G transition) was identified at codon 313.
• This mutation abolishes an AflIII restriction enzyme recognition site.
• The polymorphism exhibits co-dominant inheritance.
• Approximately 25% of randomly selected individuals were heterozygous for this polymorphism.

Conclusions:

• A novel, detectable polymorphism in the WT1 gene has been identified.
• This WT1 gene polymorphism serves as a useful marker for genetic analysis.
• The findings facilitate the identification of heterozygotes and genetic studies in families.
• This research contributes to the understanding of WT1 gene variations in cancer predisposition.