MYH Gene Status in Polish FAP Patients without APC Gene Mutations
Marzena Skrzypczak1, Marta Podralska, Wolfram Heinritz
1Institute of Human Genetics, Polish Academy of Sciences, Poznań, Poland. andp@man.poznan.pl.
Hereditary Cancer in Clinical Practice
|March 13, 2010
Summary
Familial Adenomatous Polyposis (FAP) is often linked to APC gene mutations. However, this study found heterozygous MYH gene mutations in 13% of FAP patients lacking APC mutations, suggesting a potential role in disease phenotype modification.
Area of Science:
- Genetics
- Oncology
- Gastroenterology
Background:
- Familial Adenomatous Polyposis (FAP) is an inherited condition causing numerous large intestine polyps.
- Approximately 50% of FAP cases are linked to APC gene mutations.
- Recessive inheritance of MYH gene mutations causes a milder FAP phenotype.
Purpose of the Study:
- Investigate genetic factors in FAP patients without APC mutations.
- Identify the role of MYH gene mutations in FAP.
- Determine if MYH mutations influence FAP phenotype and disease onset.
Main Methods:
- Examined 90 FAP patients from a DNA bank with no detected APC mutations.
- Screened for two common MYH gene mutations (Y165C and G382D).
- Analyzed the correlation between MYH mutation status and FAP phenotype/age of onset.
Main Results:
- Heterozygous MYH mutations (Y165C or G382D) were found in 13% of FAP patients lacking APC mutations.
- No other MYH gene coding sequence mutations were observed.
- Patients with heterozygous MYH mutations did not exhibit a milder phenotype; mean age of onset was lower.
Conclusions:
- MYH gene mutations do not appear to precondition FAP occurrence in this cohort but may modify the phenotype.
- The study suggests FAP diagnostic criteria in Poland may be more stringent than internationally.
- Further research is needed to fully elucidate the role of MYH in FAP pathogenesis and phenotype variability.
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