{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,29]],"date-time":"2026-08-29T02:39:10Z","timestamp":1787971150226,"version":"build-2784847793"},"reference-count":68,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2025,2,19]],"date-time":"2025-02-19T00:00:00Z","timestamp":1739923200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Schwartz Research Fund Award","award":["T32-DK007158"],"award-info":[{"award-number":["T32-DK007158"]}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["T32-DK007158"],"award-info":[{"award-number":["T32-DK007158"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Microorganisms"],"abstract":"<jats:p>The copy number (CN) variant AMY1 encodes the salivary amylase enzyme which promotes starch digestion. Although this gene has been associated with dental caries and periodontal disease susceptibility, the impact of the interaction between AMY1 CN and starch on oral biofilms is unclear. We explored how oral microbiota communities shaped by AMY1 CN respond to starch by employing an in vitro model of biofilm formation. We cultured biofilms using saliva samples from 31 donors with a range of AMY1 CNs (between 2 and 20 copies) and self-reported gum disease states; we used media with and without starch. Many of the most prevalent genera in saliva were also prevalent in the derived biofilms. The presence of starch in the media was associated with lower biofilm alpha diversity. We found a significant interaction between AMY1 CN and the media carbohydrate content that influenced the proportions of Atopobium and Veillonella. Members of these genera have been associated with dental caries and periodontitis. These findings suggest that the effects of carbohydrates on oral microbiome composition depend on AMY1 CN and that human oral bacteria evolved in response to expansion of this host gene locus.<\/jats:p>","DOI":"10.3390\/microorganisms13020461","type":"journal-article","created":{"date-parts":[[2025,2,19]],"date-time":"2025-02-19T08:36:46Z","timestamp":1739954206000},"page":"461","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["The Impact of Human Salivary Amylase Gene Copy Number and Starch on Oral Biofilms"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5348-3307","authenticated-orcid":false,"given":"Dorothy K.","family":"Superdock","sequence":"first","affiliation":[{"name":"Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9317-4637","authenticated-orcid":false,"given":"Lynn M.","family":"Johnson","sequence":"additional","affiliation":[{"name":"Cornell Statistical Consulting Unit, Cornell University, Ithaca, NY 14853, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer","family":"Ren","sequence":"additional","affiliation":[{"name":"Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alizeh","family":"Khan","sequence":"additional","affiliation":[{"name":"Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-5402-238X","authenticated-orcid":false,"given":"Megan","family":"Eno","sequence":"additional","affiliation":[{"name":"Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-2152-2114","authenticated-orcid":false,"given":"Shuai","family":"Man","sequence":"additional","affiliation":[{"name":"Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0278-7655","authenticated-orcid":false,"given":"Angela C.","family":"Poole","sequence":"additional","affiliation":[{"name":"Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,2,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"46","DOI":"10.1177\/0022034518788283","article-title":"Effects of Starch on Oral Health: Systematic Review to Inform WHO Guideline","volume":"98","author":"Halvorsrud","year":"2019","journal-title":"J. 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