{"id":162132,"date":"2025-04-14T13:49:34","date_gmt":"2025-04-14T13:49:34","guid":{"rendered":"https:\/\/raed.academy\/?p=162132"},"modified":"2025-04-14T13:49:34","modified_gmt":"2025-04-14T13:49:34","slug":"polidactilia-la-peculiaritat-de-tenir-sis-dits","status":"publish","type":"post","link":"https:\/\/raed.academy\/ca\/polidactilia-la-peculiaritat-de-tenir-sis-dits\/","title":{"rendered":"Polidact\u00edlia, la peculiaritat de tenir sis dits"},"content":{"rendered":"<div id=\"attachment_113823\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-113823\" class=\"wp-image-113823 size-full\" src=\"https:\/\/raed.academy\/wp-content\/uploads\/2022\/03\/August-Corominas-Vilardell.webp\" sizes=\"(max-width: 600px) 100vw, 600px\" srcset=\"https:\/\/raed.academy\/wp-content\/uploads\/2022\/03\/August-Corominas-Vilardell.webp 600w, https:\/\/raed.academy\/wp-content\/uploads\/2022\/03\/August-Corominas-Vilardell-400x300.webp 400w\" alt=\"August Corominas Vilardell\" width=\"600\" height=\"450\" aria-describedby=\"caption-attachment-113823\" \/><p id=\"caption-attachment-113823\" class=\"wp-caption-text\">Dr. August Corominas<\/p><\/div>\n<p><a href=\"https:\/\/raed.academy\/ca\/academics\/dr-august-corominas-vilardell\/\" target=\"_blank\" rel=\"noopener\"><em><strong>August Corominas<\/strong><\/em><\/a>, professor de Fisiologia Humana de la <strong>Universitat de M\u00farcia<\/strong> i de la <strong>Universitat Aut\u00f2noma de Barcelona<\/strong> i acad\u00e8mic em\u00e8rit de la <strong>Reial Acad\u00e8mia Europea de Doctors<\/strong> (RAED), comparteix amb la comunitat acad\u00e8mica l&#8217;article <strong>&#8220;Polidact\u00edlia&#8221;<\/strong>, en qu\u00e8 aborda el trastorn gen\u00e8tico que porta algunes persones a tenir sis dits en cada m\u00e0 o en cada peu, o en tots en conjunt. L&#8217;acad\u00e8mic ha compartit recentment en aquesta publicaci\u00f3 els articles <a href=\"https:\/\/raed.academy\/ca\/la-maldat-de-putin\/\" target=\"_blank\" rel=\"noopener\"><strong>&#8220;La maldat de Putin&#8221;<\/strong><\/a>, <a href=\"https:\/\/raed.academy\/ca\/nova-apocalipsi-i-batalla-de-larmagedo\/\" target=\"_blank\" rel=\"noopener\"><strong>&#8220;Nou apocalipsi i batalla d&#8217;Armagedon&#8221;<\/strong><\/a>, <a href=\"https:\/\/raed.academy\/ca\/ser-vell-o-no\/\" target=\"_blank\" rel=\"noopener\"><strong>&#8220;Ser vell o no&#8221;<\/strong><\/a>, <a href=\"https:\/\/raed.academy\/ca\/medicina-anti-aging-les-claus-de-la-longevitat\/\" target=\"_blank\" rel=\"noopener\"><strong>&#8220;Anti-Aging&#8221;<\/strong><\/a>,\u00a0 <a href=\"https:\/\/raed.academy\/ca\/el-grafe-i-la-millora-dels-diagnostics-medics\/\" target=\"_blank\" rel=\"noopener\"><strong>&#8220;Graf\u00e8: un element de gran futur tecnol\u00f2gic&#8221;<\/strong><\/a>, <a href=\"https:\/\/raed.academy\/ca\/estadistica-dhiroshima\/\" target=\"_blank\" rel=\"noopener\"><strong>&#8220;Estad\u00edstica d&#8217;Hiroshima&#8221;<\/strong><\/a>\u00a0i <a href=\"https:\/\/raed.academy\/ca\/viure-a-la-lluna\/\" target=\"_blank\" rel=\"noopener\"><strong>&#8220;Viure a la Lluna&#8221;<\/strong><\/a>, <a href=\"https:\/\/raed.academy\/ca\/els-beneficis-de-la-cultura-i-la-dieta-mediterranies\/\" target=\"_blank\" rel=\"noopener\"><strong>&#8220;La dieta mediter\u00e0nia&#8221;<\/strong><\/a>, <a href=\"https:\/\/raed.academy\/ca\/els-dificils-inicis-de-can-ruti\/\" target=\"_blank\" rel=\"noopener\"><strong>&#8220;Els dif\u00edcils inicis de Can Ruti&#8221;<\/strong><\/a>, <a href=\"https:\/\/raed.academy\/ca\/els-secrets-de-la-longevitat-i-les-zones-blaves\/\" target=\"_blank\" rel=\"noopener\"><strong>Els secrets de la longevitat i les &#8216;zones blaves&#8217;<\/strong><\/a>, <a href=\"https:\/\/raed.academy\/ca\/atencio-a-les-caigudes-de-nit-i-de-dia\/\" target=\"_blank\" rel=\"noopener\"><strong>&#8220;Atenci\u00f3 a les caigudes, de nit i de dia&#8221;<\/strong><\/a>,\u00a0<a href=\"https:\/\/raed.academy\/ca\/la-bona-vida-i-la-vida-bona\/\" target=\"_blank\" rel=\"noopener\"><strong>&#8220;La bona vida i la vida bona&#8221;<\/strong><\/a>, <a href=\"https:\/\/raed.academy\/ca\/vida-biologica-i-vida-quantica\/\" target=\"_blank\" rel=\"noopener\"><strong>&#8220;Vida biol\u00f2gica i Vida Qu\u00e0ntica&#8221;<\/strong><\/a>, <a href=\"https:\/\/raed.academy\/ca\/lera-dels-hospitals-intel%c2%b7ligents\/\" target=\"_blank\" rel=\"noopener\"><strong>&#8220;Hospitals intel\u00b7ligents&#8221;<\/strong><\/a>, <a href=\"https:\/\/raed.academy\/ca\/cosmonautica-i-medicina-espacial\/\" target=\"_blank\" rel=\"noopener\"><strong>&#8220;Cosmon\u00e0utica i medicina espacial&#8221;<\/strong><\/a>, <a href=\"https:\/\/raed.academy\/ca\/el-maltractament-i-la-seva-gestio\/\" target=\"_blank\" rel=\"noopener\"><strong>&#8220;El maltractament i la seva gesti\u00f3&#8221;<\/strong><\/a>, <a href=\"https:\/\/raed.academy\/ca\/biologia-quantica\/\" target=\"_blank\" rel=\"noopener\"><strong>&#8220;Biologia qu\u00e0ntica&#8221;<\/strong><\/a> i <a href=\"https:\/\/raed.academy\/ca\/lexemple-del-negre-de-banyoles\/\" target=\"_blank\" rel=\"noopener\"><strong>&#8220;El negre de Banyoles (boixim\u00e0 o hotentot)&#8221;<\/strong><\/a>. A m\u00e9s \u00e9s autor d&#8217;un dels cap\u00edtols del llibre <strong>&#8220;Vitalidad al envejecer. Si lo deseas, puedes vivir m\u00e1s a\u00f1os con salud&#8221;<\/strong>, editat per la Reial Corporaci\u00f3 amb el suport de <strong>Vichy Catal\u00e1n<\/strong>.<\/p>\n<h2>Polidact\u00edlia<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-full wp-image-162612\" src=\"https:\/\/raed.academy\/wp-content\/uploads\/2025\/04\/polidactilia-dst.webp\" sizes=\"(max-width: 600px) 100vw, 600px\" srcset=\"https:\/\/raed.academy\/wp-content\/uploads\/2025\/04\/polidactilia-dst.webp 600w, https:\/\/raed.academy\/wp-content\/uploads\/2025\/04\/polidactilia-dst-440x264.webp 440w\" alt=\"\" width=\"600\" height=\"360\" \/>Existeix un trastorn gen\u00e8tic conegut comunament com a polidact\u00edlia que es caracteritza per la pres\u00e8ncia de m\u00e9s de cinc dits a mans o peus. Quan una persona t\u00e9 24 dits en total, per exemple sis en cada extremitat, es tracta d&#8217;una forma extrema de polidact\u00edlia.<\/p>\n<p>Quin \u00e9s el mecanisme gen\u00e8tic i molecular i com s&#8217;hereta:<\/p>\n<p>Gen\u00e8tica i her\u00e8ncia<\/p>\n<ol>\n<li>La polidactilia sol heretar-se com un tret autos\u00f2mic dominant. Aix\u00f2 significa que una sola c\u00f2pia del gen canviat (d&#8217;un dels pares) pot causar el trastorn. Si un dels pares t\u00e9 polidactilia i \u00e9s heterozigot, hi ha un 50% de probabilitat de transmetre-ho a la seva descend\u00e8ncia.<\/li>\n<li>Gens implicats. Diversos gens estan involucrats en la formaci\u00f3 d\u2019extremitats. Entre els m\u00e9s importants:<br \/>\nGLI3: associat a polidactilia postaxial (dit extra a prop del dit petit).<\/li>\n<li>Mutacions en GLI3 poden causar polidactilia a\u00efllada o s\u00edndromes m\u00e9s complexes (com la s\u00edndrome de Greig).<\/li>\n<li>SHH (Sonic Hedgehog) i la seva regi\u00f3 reguladora ZRS (Zone of Polarizing Activity Regulatory Sequence): regulen el desenvolupament de l&#8217;eix anteroposterior de l&#8217;extremitat.<\/li>\n<li>Alteracions en aquesta regi\u00f3 poden induir dits extra en diferents posicions.<\/li>\n<li>HOXD13: important per al patr\u00f3 de formaci\u00f3 dels dits. Mutacions poden causar polidactilia o sindactilia.<\/li>\n<\/ol>\n<p>Mecanisme molecular<\/p>\n<ul>\n<li>Durant el desenvolupament embrionari, les extremitats es formen sota la influ\u00e8ncia de gradients de morf\u00f2gens com l&#8217;SHH, que determinen quants dits es formen i en quines posicions.<\/li>\n<li>En condicions normals, l&#8217;SHH s&#8217;expressa en una regi\u00f3 espec\u00edfica (ZPA) a l&#8217;extrem posterior del brot de l&#8217;extremitat.<\/li>\n<li>Si l&#8217;SHH s&#8217;expressa ect\u00f2picament (fora del seu lloc habitual) o la seva expressi\u00f3 est\u00e0 augmentada per una mutaci\u00f3 reguladora (per exemple, al ZRS), poden formar-se dits addicionals.<br \/>\nA m\u00e9s, mutacions en GLI3 (un gen regulador aig\u00fces a baix de\u00a0SHH) poden alterar la resposta a aquests senyals, portant a errors en la formaci\u00f3 dels dits.<\/li>\n<\/ul>\n<p>Per saber si en un cas particular hi ha risc gen\u00e8tic o si \u00e9s sindr\u00f2mic (forma part d&#8217;una s\u00edndrome major), podr\u00edem abordar tamb\u00e9 de formes sindr\u00f3micas de polidact\u00edlia, que s\u00ed que impliquen d&#8217;altres gens i her\u00e8ncies m\u00e9s complexes.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>August Corominas aborda, a l&#8217;article &#8220;Polidactilia&#8221;, el trastorn gen\u00e8tic que porta algunes persones a tenir sis dits a cada m\u00e0 oa cada peu, o en tots en conjunt<\/p>\n","protected":false},"author":12,"featured_media":162613,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[332,455,213],"tags":[],"class_list":["post-162132","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-biologia-ca","category-ciencies-de-la-salut","category-medicina-i-cirurgia","et-has-post-format-content","et_post_format-et-post-format-standard"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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