{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,11]],"date-time":"2026-03-11T21:13:17Z","timestamp":1773263597922,"version":"3.50.1"},"reference-count":82,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2026,3,6]],"date-time":"2026-03-06T00:00:00Z","timestamp":1772755200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia","doi-asserted-by":"publisher","award":["10.54499\/2022.02406.CEECIND\/CP1720\/CT0014"],"award-info":[{"award-number":["10.54499\/2022.02406.CEECIND\/CP1720\/CT0014"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia","doi-asserted-by":"publisher","award":["2024.04340.BD"],"award-info":[{"award-number":["2024.04340.BD"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia","doi-asserted-by":"publisher","award":["UID\/04501\/2025"],"award-info":[{"award-number":["UID\/04501\/2025"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100008530","name":"Fundo Europeu de Desenvolvimento Regional","doi-asserted-by":"publisher","award":["COMPETE2030-FEDER-00726500"],"award-info":[{"award-number":["COMPETE2030-FEDER-00726500"]}],"id":[{"id":"10.13039\/501100008530","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JDB"],"abstract":"<jats:p>Transcriptional regulation is pivotal for developmental processes and cell fate specification in homeostasis. One particularly relevant group of transcription factors is the sine oculis homeobox (SIX) family, which is involved in a wide range of molecular processes from development to tissue maintenance. Within this family, distinct subfamilies exhibit specific DNA-binding preferences and can function as transcriptional activators or repressors. In this review, we focus on the Optix\/SIX3\u2013SIX6 subfamily and discuss their roles as transcriptional regulators, as well as the consequences of their deregulation for neuronal and ocular development and for the maintenance of tissue homeostasis. We further examine how SIX3 can act either as a tumour suppressor or as a marker of poor prognosis in different cancer types. Moreover, we summarize recent findings on the role of SIX3 in pancreatic \u03b2 cells and highlight emerging evidence that SIX2 also contributes to \u03b2-cell identity and regulatory stability. Downregulation of SIX2 and SIX3 alters gene regulatory programs associated with \u03b2-cell homeostasis and contributes to type 2 diabetes. As accumulating evidence links members of the SIX family to cancer and metabolic disease, it is crucial to characterize how these transcription factors regulate cell identity, with important implications for disease mechanisms and therapeutic strategies.<\/jats:p>","DOI":"10.3390\/jdb14010013","type":"journal-article","created":{"date-parts":[[2026,3,6]],"date-time":"2026-03-06T17:25:59Z","timestamp":1772817959000},"page":"13","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["SIX3 as a Regulator of Development and Disease"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-8300-1849","authenticated-orcid":false,"given":"Ana Beatriz","family":"Matos","sequence":"first","affiliation":[{"name":"Department of Medical Sciences, Institute of Biomedicine, University of Aveiro, Agra do Crasto, 3810-193 Aveiro, Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1869-1984","authenticated-orcid":false,"given":"Laura Jesus","family":"Castro","sequence":"additional","affiliation":[{"name":"Department of Medical Sciences, Institute of Biomedicine, University of Aveiro, Agra do Crasto, 3810-193 Aveiro, Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9359-7111","authenticated-orcid":false,"given":"Torcato","family":"Martins","sequence":"additional","affiliation":[{"name":"Department of Medical Sciences, Institute of Biomedicine, University of Aveiro, Agra do Crasto, 3810-193 Aveiro, Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2026,3,6]]},"reference":[{"key":"ref_1","unstructured":"Davidson, E.H. 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