COL17A1 germline variant p.Ser1029Ala and mucosal malignant melanoma: An autopsy study

Tong,Daike; Tanaka,Masashi; Eguchi,Hidetaka; Okazaki,Yasushi; Muramatsu,Masaaki; Arai,Tomio

doi:10.3892/mco.2021.2465

COL17A1 germline variant p.Ser1029Ala and mucosal malignant melanoma: An autopsy study

Authors:
- Daike Tong
- Masashi Tanaka
- Hidetaka Eguchi
- Yasushi Okazaki
- Masaaki Muramatsu
- Tomio Arai
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Affiliations: Department of Molecular Epidemiology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo 113‑8510, Japan, Department of Neurology, Graduate School of Medicine, Juntendo University, Tokyo 113‑8421, Japan, Diagnostics and Therapeutics of Intractable Diseases, Intractable Disease Research Center, Graduate School of Medicine, Juntendo University, Tokyo 113‑8421, Japan, Department of Pathology, Tokyo Metropolitan Geriatric Hospital, Tokyo 173‑0015, Japan
Published online on: December 14, 2021 https://doi.org/10.3892/mco.2021.2465
Article Number: 32
Copyright: © Tong et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Collagen type XVII α1 (COL17A1) encodes a hemidesmosomal protein at the epidermal‑dermal junction and its variants are implicated in blistering skin diseases. Recent experiments in rodents revealed that Col17a1 has critical roles in stem cells of epidermal origin and in melanoma carcinogenesis. In the present study, it was investigated whether germline variants in COL17A1 are associated with skin cancer and other cancer types using indexed consecutive autopsy cases from the Japanese Geriatric Single Nucleotide Polymorphism database (n=2,343; mean age, 80 years). The database included 12 patients with skin cancer. A total of 53 COL17A1 missense variants on an exome chip were analyzed. One variant, p.Ser1029Ala (rs118166857), which had a minor allele frequency of 1.0%, exhibited a nominal positive sign of association with skin cancer [Fisher's exact P=0.002, odds ratio (OR)=16.93, 95% CI: 4.44‑64.64]. This variant was detected in 2/2 patients with mucosal malignant melanoma (mMM) and 1/3 patients with extramammary Paget's disease, and in none of the patients with non‑melanoma cancer, e.g., squamous cell and basal cell carcinoma. Other cancer types were searched in the database and the p.Ser1029Ala variant was indicated to be nominally associated with breast cancer (P=0.006, OR=4.17, 95% CI: 1.72‑10.11). In the two mMM cases, targeted exome sequencing of 55 cancer‑predisposing genes (including tumor protein 53, BRCA1/2 and mismatch repair genes) detected no apparent pathogenic variants, but revealed variants of unknown significance in axin 2, DNA directed polymerase ζ catalytic subunit and contactin 6. Since COL17A1 provides a niche for melanocyte stem cells, it was hypothesized that the p.Ser1029Ala variant in the COL17A1 ectodomain may affect the microenvironment, e.g., the cell competition. This is a working hypothesis generated from human autopsy cases and warrants further epidemiological and molecular biological validation.

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