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Human transferrin (Tf): a single mutation at codon 570 determines Tf C1 or Tf C2 variant
K Namekata1, F Oyama, M Imagawa
1Department of Neuropathology, Faculty of Medicine, University of Tokyo, Japan.
Human Genetics
|September 1, 1997
Summary
Transferrin (Tf) variants C1 and C2 differ by a single DNA base change. This genetic variation, identified through PCR genotyping, explains the distinct phenotypes observed in isoelectric focusing.
Area of Science:
- Genetics
- Biochemistry
- Molecular Biology
Background:
- Transferrin (Tf) exhibits multiple variants detectable by isoelectric focusing (IEF).
- The genetic basis for major Tf variants, specifically Tf C1 and Tf C2, has remained largely uncharacterized at the amino acid level.
- Previous understanding attributed Tf variants to multiple alleles at a single Tf locus.
Purpose of the Study:
- To elucidate the molecular difference between the Tf C1 and Tf C2 variants.
- To identify the specific genetic alteration responsible for Tf C1 and Tf C2 phenotypes.
- To develop a method for genotyping Tf C1 and Tf C2 alleles.
Main Methods:
- Isoelectric focusing (IEF) was used to analyze Tf variants.
- DNA sequencing of the Tf gene was performed to identify genetic differences.
- Polymerase Chain Reaction (PCR)-based genotyping was established.
Main Results:
- A single base substitution (C/T) was identified in exon 15 of the Tf gene.
- This nucleotide change at codon 570 results in a Proline to Serine substitution.
- The identified substitution directly correlates with the Tf C1 and Tf C2 phenotypes observed via IEF.
- A novel PCR-based genotyping method for Tf C1 and Tf C2 alleles was successfully developed.
Conclusions:
- The Tf C1 and Tf C2 variants are differentiated by a specific single nucleotide polymorphism (SNP) in the Tf gene.
- This genetic finding provides a molecular explanation for Tf C1/C2 heterogeneity.
- The developed PCR genotyping assay enables efficient and accurate discrimination of Tf C1 and Tf C2 alleles.