Study of Cystathionine β-Synthase Gene Variants in Homocystinuria
Author Information
Author(s): Vyletal Petr, Sokolová Jitka, Cooper David N., Kraus Jan P., Krawczak Michael, Pepe Guglielmina, Rickards Olga, Koch Hans G., Linnebank Michael, Kluijtmans Leo A. J., Blom Henk J., Boers Godfried H. J., Gaustadnes Mette, Skovby Flemming, Wilcken Bridget, Wilcken David E. L., Andria Generoso, Sebastio Gianfranco, Naughten Eileen R., Yap Sufin, Ohura Toshihiro, Pronicka Ewa, Laszlo Aranka, Kožich Viktor
Primary Institution: Center for Applied Genomics, Institute of Inherited Metabolic Disorders, Charles University 1st Faculty of Medicine
Hypothesis
The pathogenic c.833T>C mutation in the CBS gene has occurred repeatedly and independently in European populations.
Conclusion
The study suggests that the common nonpathogenic CBS variant may have facilitated the recurrent generation of pathogenic alleles through gene conversion.
Supporting Evidence
- The c.833C allele is the most common pathogenic CBS variant in Western Eurasians.
- Haplotype analysis revealed 29 distinct CBS haplotypes among the studied populations.
- The study found that the frequency of the c.833C allele in healthy newborns was significantly higher than in symptomatic patients.
Takeaway
This study looks at a gene that can cause a disease called homocystinuria, showing that a common mutation happens a lot in Europe and might be linked to other non-harmful gene changes.
Methodology
The study involved haplotype analysis of CBS gene variants in patients with homocystinuria and control populations from Europe and Africa.
Potential Biases
There may be bias in the clinical ascertainment of patients with milder forms of the disease.
Limitations
The study may be limited by the small sample size and potential ascertainment bias in identifying patients.
Participant Demographics
Participants were primarily of European ancestry, with some from other countries including Japan and Australia.
Digital Object Identifier (DOI)
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