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Sequencing of microRNAs deregulated in BC was performed using DNA from Chilean patients with a strong family history and negative for mutations in BRCA1\/BRCA2. Seventeen variants were identified, three of which were selected for a case-control association study: rs376491654 (miR-335), rs755634302 (miR-497), and rs190708267 (miR-155). For rs190708267 C&gt;T, the heterozygous T allele was detected in four BC cases and absent in controls, while homozygous TT cases were not detected. Variants were modelled in silico, cloned in a plasmid, expressed in BC cell lines, and functional in vitro assays were performed. Overexpression of the miR-155-T allele increased mature miR-155-5p levels in both BC cell lines, suggesting that its presence alters pre-miR-155 processing. Moreover, BC cells overexpressing the miR-155-T allele showed increased proliferation, migration, and resistance to cisplatin-induced death compared to miR-155-C overexpressing cells. Of note, the 3\u2032UTR of APC, GSK3\u03b2, and PPP1CA genes, all into the canonical Wnt signaling pathway, were identified as direct targets. APC and GSK3\u03b2 mRNA levels decreased while PP1 levels increased. These results suggest a pathogenic role of the variant rs190708267 (miR-155) in BRCA 1\/2 negative BC, conferring susceptibility and promoting traits of aggressiveness.<\/jats:p>","DOI":"10.3390\/ijms232315418","type":"journal-article","created":{"date-parts":[[2022,12,7]],"date-time":"2022-12-07T01:47:46Z","timestamp":1670377666000},"page":"15418","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["A Single Variant in Pri-miRNA-155 Associated with Susceptibility to Hereditary Breast Cancer Promotes Aggressiveness in Breast Cancer Cells"],"prefix":"10.3390","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5408-2644","authenticated-orcid":false,"given":"Natalia","family":"Landeros","sequence":"first","affiliation":[{"name":"Programa de Gen\u00e9tica Humana, Instituto de Ciencias Biom\u00e9dicas, Facultad de Medicina, Universidad de Chile, Santiago 8380453, Chile"},{"name":"Programa de Biolog\u00eda Celular y Molecular, Instituto de Ciencias Biom\u00e9dicas, Facultad de Medicina, Universidad de Chile, Santiago 8380453, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patricio","family":"Gonzalez-Hormazabal","sequence":"additional","affiliation":[{"name":"Programa de Gen\u00e9tica Humana, Instituto de Ciencias Biom\u00e9dicas, Facultad de Medicina, Universidad de Chile, Santiago 8380453, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3429-3089","authenticated-orcid":false,"given":"Pablo","family":"P\u00e9rez-Moreno","sequence":"additional","affiliation":[{"name":"Programa de Biolog\u00eda Celular y Molecular, Instituto de Ciencias Biom\u00e9dicas, Facultad de Medicina, Universidad de Chile, Santiago 8380453, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julio C.","family":"Tapia","sequence":"additional","affiliation":[{"name":"Programa de Biolog\u00eda Celular y Molecular, Instituto de Ciencias Biom\u00e9dicas, Facultad de Medicina, Universidad de Chile, Santiago 8380453, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5068-7259","authenticated-orcid":false,"given":"Lilian","family":"Jara","sequence":"additional","affiliation":[{"name":"Programa de Gen\u00e9tica Humana, Instituto de Ciencias Biom\u00e9dicas, Facultad de Medicina, Universidad de Chile, Santiago 8380453, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,12,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1941","DOI":"10.1002\/ijc.31937","article-title":"Estimating the global cancer incidence and mortality in 2018: GLOBOCAN sources and methods","volume":"144","author":"Ferlay","year":"2019","journal-title":"Int. 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