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Updated: May 1, 2026
Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
Published on: June 7, 2019
Rare missense variants in POT1 predispose to familial cutaneous malignant melanoma
Jianxin Shi1, Xiaohong R Yang1, Bari Ballew2
11] Division of Cancer Epidemiology and Genetics, National Cancer Institute, US National Institutes of Health, US Department of Health and Human Services, Bethesda, Maryland, USA. [2].
Abstract:
Although CDKN2A is the most frequent high-risk melanoma susceptibility gene, the underlying genetic factors for most melanoma-prone families remain unknown. Using whole-exome sequencing, we identified a rare variant that arose as a founder mutation in the telomere shelterin gene POT1 (chromosome 7, g.124493086C>T; p.Ser270Asn) in five unrelated melanoma-prone families from Romagna, Italy. Carriers of this variant had increased telomere lengths and numbers of fragile telomeres, suggesting that this variant perturbs telomere maintenance. Two additional rare POT1 variants were identified in all cases sequenced in two separate Italian families, one variant per family, yielding a frequency for POT1 variants comparable to that for CDKN2A mutations in this population. These variants were not found in public databases or in 2,038 genotyped Italian controls. We also identified two rare recurrent POT1 variants in US and French familial melanoma cases. Our findings suggest that POT1 is a major susceptibility gene for familial melanoma in several populations.
Insights
Researchers found a POT1 gene variant linked to familial melanoma risk in Italian families. This discovery highlights POT1 as a significant gene for inherited melanoma susceptibility, similar to CDKN2A.
Area of Science:
- Genetics
- Oncology
- Molecular Biology
Background:
- While CDKN2A is a known high-risk melanoma gene, the genetic causes for many melanoma-prone families are still unknown.
- Understanding the genetic basis of familial melanoma is crucial for risk assessment and prevention strategies.
Purpose of the Study:
- To identify novel genetic susceptibility factors for familial melanoma.
- To investigate the role of the POT1 gene in melanoma predisposition.
Main Methods:
- Whole-exome sequencing was employed to analyze DNA from melanoma-prone families.
- Rare POT1 variants were identified and their frequency compared to controls and CDKN2A mutations.
- Telomere length and fragility were assessed in variant carriers.
Main Results:
- A founder mutation in the POT1 gene (p.Ser270Asn) was identified in five Italian melanoma-prone families.
- POT1 variant carriers exhibited increased telomere length and fragile telomeres, indicating impaired telomere maintenance.
- Additional rare POT1 variants were found in other familial melanoma cases across different populations, suggesting a broader role.
Conclusions:
- The POT1 gene is a significant susceptibility gene for familial melanoma.
- POT1 variants contribute to melanoma risk, potentially through mechanisms affecting telomere maintenance.
- These findings expand the spectrum of genes associated with inherited melanoma risk.
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