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Published on: August 4, 2019
High prevalence of MUTYH associated polyposis among minority populations in Israel, due to rare founder pathogenic
Gili Reznick Levi1, Yael Goldberg2, Hanna Segev1
1The Genetics Institute, Rambam Health Care Campus, Haifa, Israel.
Background:
Autosomal recessive conditions are common in consanguineous populations. Since consanguinity is common in the Israeli Arab population, we evaluated the rate of MUTYH polyposis (MAP) among polyposis patients in this population and studied Pathogenic Variants (PVs) spectrum.
Methods:
We reviewed health records of all Arab and Druze polyposis patients referred for counseling during 2013-2020 who fulfilled the Israeli Genetic Society criteria for MUTYH/APC testing, in a tertiary center in Northern Israel and four additional gastro-genetic clinics in Israel.
Results:
The Northern cohort included 37 patients from 30 unrelated families; 8(26.6%) carried bi-allelic MUTYH PVs. The major variant p.Glu452del was detected in 6/8 Druze and Muslim families who shared the same haplotype. Other PVs detected in both cohorts included p.Tyr56Ter, p.His57Arg, c.849+3A>C, p.Ala357fs, and p.Tyr151Cys. Among bi-allelic carriers, 88% reported consanguinity, and 100% had positive family history for polyposis or colorectal cancer (CRC). Generally, the age of CRC was 10 years younger than reported in the general MAP population.
Conclusions:
MAP accounted for 27% of polyposis cases in the Arab population of Northern Israel. PVs spectrum is unique, with high frequency of the founder variant p.Glu452del. Our results may inform the genetic testing strategy in the Israeli Arab population.
Insights
MUTYH polyposis (MAP) is prevalent in the Israeli Arab population, with a unique spectrum of pathogenic variants (PVs). Genetic testing strategies should consider the high frequency of the founder variant p.Glu452del.
Area of Science:
- Genetics
- Gastroenterology
- Population Health
Background:
- Autosomal recessive conditions are prevalent in consanguineous populations.
- Consanguinity is common in the Israeli Arab population, necessitating evaluation of MUTYH polyposis (MAP) rates and pathogenic variants (PVs) spectrum.
- MAP is an inherited condition increasing colorectal cancer (CRC) risk.
Approach:
- Reviewed health records of Arab and Druze polyposis patients undergoing MUTYH/APC testing (2013-2020) in Northern Israel.
- Included 37 patients from 30 unrelated families in the Northern cohort.
- Analyzed PVs spectrum and consanguinity rates among bi-allelic MUTYH PV carriers.
Key Points:
- 26.6% of polyposis patients in the Northern cohort carried bi-allelic MUTYH PVs.
- The founder variant p.Glu452del was frequent among Druze and Muslim families.
- Bi-allelic carriers reported high consanguinity (88%) and family history of polyposis/CRC (100%), with earlier CRC onset.
Conclusions:
- MAP accounts for 27% of polyposis cases in the Israeli Arab population of Northern Israel.
- The PVs spectrum is unique, characterized by a high frequency of the founder variant p.Glu452del.
- Findings can inform genetic testing strategies for this population.
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