{"id":5722,"date":"2019-02-26T10:20:14","date_gmt":"2019-02-26T13:20:14","guid":{"rendered":"http:\/\/tdibrasil.org\/?p=5722"},"modified":"2021-10-10T03:40:53","modified_gmt":"2021-10-10T06:40:53","slug":"origem-da-multicelularidade-ou-propaganda-enganosa","status":"publish","type":"post","link":"https:\/\/tdibrasil.org\/index.php\/2019\/02\/26\/origem-da-multicelularidade-ou-propaganda-enganosa\/","title":{"rendered":"Origem da Multicelularidade ou Propaganda Enganosa?"},"content":{"rendered":"<figure id=\"attachment_5853\" aria-describedby=\"caption-attachment-5853\" style=\"width: 660px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-5853\" src=\"https:\/\/tdibrasil.org\/wp-content\/uploads\/2019\/02\/algas.jpg\" alt=\"\" width=\"660\" height=\"412\" \/><figcaption id=\"caption-attachment-5853\" class=\"wp-caption-text\"><center>Ilustra\u00e7\u00e3o \/ \u00a9<\/center><\/figcaption><\/figure>\n<p style=\"text-align: justify; font-size: 12px;\"><strong>Observa\u00e7\u00e3o:\u00a0<\/strong>As refer\u00eancias feitas ao conte\u00fado popular (Wiki&#8217;s) se devem ao fato da divulga\u00e7\u00e3o ser direcionada a p\u00fablico leigo. H\u00e1 conte\u00fado especial em <a href=\"#is\" rel=\"noopener\">Informa\u00e7\u00e3o Suplementar<\/a>.<\/p>\n<hr \/>\n<p style=\"text-align: justify;\">Uma not\u00edcia agitou as p\u00e1ginas esta semana. A raz\u00e3o? A empolga\u00e7\u00e3o toda foi causada por <a href=\"https:\/\/www.nature.com\/articles\/s41598-019-39558-8\" target=\"_blank\" rel=\"noopener noreferrer\">uma publica\u00e7\u00e3o<\/a> na prestigiada <em>Nature<\/em> que teria demonstrado a origem da multicelularidade.\u00a0&#8220;<em>De novo<\/em> origins of multicellularity in response to predation&#8221;, ou seja, &#8220;As origens <strong>repentinas<\/strong> da multicelularidade em resposta \u00e0 preda\u00e7\u00e3o&#8221;. O termo <em>de novo<\/em> \u00e9 usado em biologia nesse caso para indicar algo que n\u00e3o \u00e9 derivado, mas original.<\/p>\n<p style=\"text-align: justify;\">Segundo o artigo, algas unicelulares (<em>Chlamydomonas reinhardtii<\/em>) sob press\u00e3o seletiva de preda\u00e7\u00e3o (introduziram um predador unicelular, <em>Paramecium tetraurelia<\/em>) desenvolveram a multicelularidade em\u00a0duas de cinco popula\u00e7\u00f5es. Isso em apenas 50 semanas (pouco menos que um ano), o que equivale a aproximadamente 750 gera\u00e7\u00f5es desta alga.<\/p>\n<p>O artigo come\u00e7a de uma forma muito interessante:<\/p>\n<blockquote>\n<p style=\"text-align: justify;\">Quase toda a vida macrosc\u00f3pica \u00e9 multicelular. Como Leo Buss enfatizou em A Evolu\u00e7\u00e3o da Individualidade, <strong>a pr\u00f3pria exist\u00eancia<\/strong> de organismos multicelulares integrados <strong>\u00e9 um resultado de processos evolutivos<\/strong>, n\u00e3o uma condi\u00e7\u00e3o inicial.<\/p>\n<\/blockquote>\n<p style=\"text-align: justify;\">Ou seja, a conclus\u00e3o j\u00e1 est\u00e1 na mesa, agora \u00e9 s\u00f3 encaixar a hip\u00f3tese seja l\u00e1 o que tenha acontecido. E \u00e9 acrescida uma declara\u00e7\u00e3o evolutiva cl\u00e1ssica:<\/p>\n<blockquote>\n<p style=\"text-align: justify;\">Parece, de fato, ser um resultado comum: organismos multicelulares evolu\u00edram de ancestrais unicelulares dezenas de vezes.<\/p>\n<\/blockquote>\n<p style=\"text-align: justify;\">A ci\u00eancia evolutiva \u00e9 a \u00fanica que usa esse racioc\u00ednio:\u00a0a explica\u00e7\u00e3o se torna mais plaus\u00edvel a medida que mais problemas semelhantes aparecem: &#8220;se \u00e9 comum, ent\u00e3o a hip\u00f3tese sobre isso \u00e9 verdadeira&#8221;. Ao inv\u00e9s de se considerar os novos problemas, se atribui mais certeza, como se a <a href=\"https:\/\/tdibrasil.org\/index.php\/2018\/06\/12\/a-ignorancia-por-evidencia\/\" target=\"_blank\" rel=\"noopener noreferrer\">ignor\u00e2ncia adicional fosse uma evid\u00eancia especial<\/a>.<\/p>\n<p style=\"text-align: justify;\">Outro ponto interessante \u00e9 que o conceito de multicelularidade n\u00e3o se aplica a esse caso ou qualquer outro caso j\u00e1 reproduzido em laborat\u00f3rio. O que eles fizeram, caso possa ser considerado, \u00e9 a forma\u00e7\u00e3o de agregados denominados &#8220;pluricelulares&#8221;. Acontece que o p\u00fablico leigo dificilmente vai compreender o abismo que existe entre pluricelularidade e multicelularidade. Isso passa a ideia de que um problema t\u00e3o imenso foi superado ao se\u00a0simplificar o que \u00e9 complexo.<\/p>\n<p style=\"text-align: justify;\">A pessoa que pesquisar na Wikipedia, por exemplo, pode encontrar as duas vers\u00f5es: em <a href=\"https:\/\/pt.wikipedia.org\/wiki\/Organismo_multicelular\" target=\"_blank\" rel=\"noopener noreferrer\">portugu\u00eas<\/a>\u00a0o\u00a0organismo multicelular \u00e9 formado por c\u00e9lulas sem constitu\u00edrem tecidos em contraste com os pluricelulares, que formariam tecidos e outras intera\u00e7\u00f5es mais complexas. J\u00e1 na <a href=\"https:\/\/en.wikipedia.org\/wiki\/Multicellular_organism\" target=\"_blank\" rel=\"noopener noreferrer\">Wikipedia em ingl\u00eas<\/a> \u00e9 exatamente o contr\u00e1rio: os organismos pluricelulares s\u00e3o os que formam essas &#8220;col\u00f4nias&#8221;, &#8220;agregados&#8221;, &#8220;filamentos&#8221; e s\u00e3o os multicelulares que desenvolvem tecidos e outras intera\u00e7\u00f5es mais complexas. E&#8230; a Wikipedia em ingl\u00eas est\u00e1 baseada em refer\u00eancias.<\/p>\n<p style=\"text-align: justify;\">Na <a href=\"#is\" rel=\"noopener\">Informa\u00e7\u00e3o Suplementar<\/a> fica claro que o termo multicelularidade n\u00e3o \u00e9 usado para agregados. Praticamente todos os artigos refor\u00e7am a posi\u00e7\u00e3o de que agregados s\u00e3o &#8220;pluricelulares&#8221;. O artigo na Nature foi propositalmente ou incompetentemente intitulado assim, uma propaganda enganosa ou uma confus\u00e3o. E isso se repete sendo divulgado todos os anos (<a href=\"https:\/\/www.sciencedaily.com\/releases\/2009\/02\/090219140546.htm\" target=\"_blank\" rel=\"noopener noreferrer\">2009<\/a>, <a href=\"https:\/\/www.nature.com\/scitable\/topicpage\/volvox-chlamydomonas-and-the-evolution-of-multicellularity-14433403\" target=\"_blank\" rel=\"noopener noreferrer\">2010<\/a>, <a href=\"https:\/\/www.newscientist.com\/article\/mg21028184-300-lab-yeast-make-evolutionary-leap-to-multicellularity\/\" target=\"_blank\" rel=\"noopener noreferrer\">2011<\/a>, <a href=\"https:\/\/www.scientificamerican.com\/article\/test-tube-yeast-evolve\/\" target=\"_blank\" rel=\"noopener noreferrer\">2012<\/a>, <a href=\"https:\/\/www.newscientist.com\/article\/dn24535-alga-takes-first-evolutionary-leap-to-multicellularity\/\" target=\"_blank\" rel=\"noopener noreferrer\">2013<\/a>, <a href=\"https:\/\/www.eurekalert.org\/pub_releases\/2014-01\/ajob-foc012414.php\" target=\"_blank\" rel=\"noopener noreferrer\">2014<\/a>, 2015, <a href=\"https:\/\/phys.org\/news\/2016-04-cell-evolved-multicellular-life.html\" target=\"_blank\" rel=\"noopener noreferrer\">2016<\/a>, <a href=\"https:\/\/blogs.biomedcentral.com\/on-biology\/2017\/11\/28\/unicellular-to-multicellular-what-can-the-green-alga-volvox-tell-us-about-the-evolution-of-multicellularity-and-cellular-differentiation\/\" target=\"_blank\" rel=\"noopener noreferrer\">2017<\/a>, <a href=\"https:\/\/www.sciencemag.org\/news\/2018\/06\/momentous-transition-multicellular-life-may-not-have-been-so-hard-after-all\" target=\"_blank\" rel=\"noopener noreferrer\">2018<\/a>\u00a0(<a href=\"https:\/\/www.forbes.com\/sites\/fionamcmillan\/2018\/06\/28\/evolution-of-multicellular-life-might-have-been-easier-than-we-thought\/#42ee7c4a5a2d\" target=\"_blank\" rel=\"noopener noreferrer\">Forbes<\/a>) e <a href=\"https:\/\/www.sciencealert.com\/scientists-have-witnessed-in-real-time-a-single-celled-algae-evolve-into-a-multicellular-organism\" target=\"_blank\" rel=\"noopener noreferrer\">2019<\/a>). Sempre o mesmo chove e n\u00e3o molha.<\/p>\n<p>Agora,\u00a0vamos supor que eles almejam alcan\u00e7ar a multicelularidade mesmo.<\/p>\n<p><strong>O Problema da Multicelularidade<\/strong><\/p>\n<p style=\"text-align: justify;\">Em primeiro lugar: um organismo multicelular n\u00e3o pode ser formado por aglomera\u00e7\u00e3o de seres unicelulares. Isso independente da teoria que for considerada. Um organismo multicelular est\u00e1 baseado em um programa \u00fanico que d\u00e1 origem, distribui e especializa cada unidade celular. Esse \u00e9 o ciclo da vida multicelular e esse ciclo tem esse &#8220;gargalo&#8221;. Qualquer proposta deve passar por ele.<\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Em animais, por exemplo, essa unidade est\u00e1 no zigoto. Todas as c\u00e9lulas de um organismo multicelular s\u00e3o produto de\/e participam de um mesmo programa que come\u00e7a com a forma\u00e7\u00e3o desta &#8220;semente&#8221;. Nele t<\/span>odas as determina\u00e7\u00f5es e todos os desdobramentos j\u00e1 est\u00e3o definidos. Os olhos que voc\u00ea usa para ler estas linhas agora j\u00e1 estavam determinados nele seja em cor, seja em forma, seja na posi\u00e7\u00e3o que est\u00e3o em seu rosto, dentre outras milhares de vari\u00e1veis. O processo de desenvolvimento org\u00e2nico multicelular \u00e9 o programa mais complexo existente conhecido. Mesmo em organismos simples, como a\u00a0<em>C. elegans<\/em>\u00a0(um\u00a0nematoide com apenas cerca de 1000 c\u00e9lulas), o desenvolvimento lan\u00e7a sombra em nossas cria\u00e7\u00f5es. Isso pode ser visto no\u00a0document\u00e1rio de Paul Nelson.<\/p>\n<p><strong>O Verdadeiro Livre Pensamento<\/strong><\/p>\n<p style=\"text-align: justify;\">Em meio ao mar de coment\u00e1rios extasiados, apenas uma menina fez um coment\u00e1rio l\u00facido e questionou a not\u00edcia:<\/p>\n<blockquote>\n<p style=\"text-align: justify;\">Eu tenho uma d\u00favida: nesse caso, <strong>como eles diferenciaram<\/strong> essas algas de estarem formando um <strong>organismo multicelular<\/strong> de estarem formando simplesmente <strong>uma forma de col\u00f4nia<\/strong>? Como diferenciaram <strong>um ser multicelular de uma col\u00f4nia de seres unicelulares<\/strong>, por exemplo?<\/p>\n<\/blockquote>\n<p style=\"text-align: justify;\">Enquanto os &#8220;livres pensadores&#8221; exultavam a &#8220;vit\u00f3ria sobre a ignor\u00e2ncia&#8221;, e comentavam seus &#8220;Darwin Vive!&#8221;, a \u00fanica coisa que ela queria <strong>saber\u00a0<\/strong>era<strong>\u00a0como isso funciona<\/strong>. Ainda h\u00e1 esperan\u00e7a.<\/p>\n<p style=\"text-align: justify; font-size: 12px;\"><em>Abaixo est\u00e3o as informa\u00e7\u00f5es suplementares para consulta.<\/em><\/p>\n<hr id=\"is\" \/>\n<div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-folder-2 su-spoiler-closed\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\"><div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><span class=\"su-spoiler-icon\"><\/span>Etimologia: multi versus pluri<\/div><div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<p>Os termos <em>multi<\/em> e <em>pluri<\/em> tem origem latina e possuem algumas acep\u00e7\u00f5es em comum, especialmente &#8220;mais&#8221; e &#8220;muitos&#8221;. Elas ainda dividem espa\u00e7o com\u00a0<em>poli<\/em>, do grego, com as mesmas acep\u00e7\u00f5es.<\/p>\n<\/div><\/div>\n<div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-folder-2 su-spoiler-closed\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\"><div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><span class=\"su-spoiler-icon\"><\/span>Informa\u00e7\u00e3o Suplementar<\/div><div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<p>A partir da confus\u00e3o entre qual \u00e9 o termo para aglomerados simples e qual o organismo realmente complexo, alguns artigos ter\u00e3o excertos apresentados com defini\u00e7\u00f5es independentes.<\/p>\n<p>Pluricelular como agregado simples:<\/p>\n<blockquote>\n<pre style=\"text-align: justify;\">An example is algal <strong>pluricellularity<\/strong>, where <strong>multiple cells<\/strong> form an aggregate, <strong>without that plasma connections<\/strong> are formed.<\/pre>\n<p style=\"text-align: justify;\">OP AKKERHUIS, Gerard AJM Jagers. <a href=\"https:\/\/link.springer.com\/chapter\/10.1007\/978-3-319-43802-3_8\" target=\"_blank\" rel=\"noopener noreferrer\">The Role of Structural Criteria in Transitions Theory: A Focus on Organisms<\/a>. In: Evolution and Transitions in Complexity. Springer, Cham, 2016. p. 137-148.<\/p>\n<\/blockquote>\n<p>Pluricelular, novamente, sem conex\u00f5es entre as c\u00e9lulas no plasma:<\/p>\n<blockquote>\n<pre style=\"text-align: justify;\">In all examples where the cells are <strong>attached but not connected throught plasma<\/strong> , e.g. the slug of a slime mould, and Lichens, the interactions<strong> result in a pluricellular<\/strong> compound object, <strong>instead of forming a multicellular<\/strong>.<\/pre>\n<p style=\"text-align: justify;\">OP AKKERHUIS, Gerard AJM Jagers. <a href=\"https:\/\/link.springer.com\/chapter\/10.1007\/978-3-319-43802-3_10\" target=\"_blank\" rel=\"noopener noreferrer\">The Role or Structural Criteria in Transition Theory: A Focus on Systems of Interacting Organisms<\/a>. In: Evolution and Transitions in Complexity. Springer, Cham, 2016. p. 172.<\/p>\n<\/blockquote>\n<p>Multicelularidade como forma\u00e7\u00e3o de intera\u00e7\u00f5es mais complexas que pluricelularidade:<\/p>\n<blockquote>\n<pre style=\"text-align: justify;\">The emergence of <strong>multicellularity<\/strong> is regarded as one of the major evolutionary events of life. This transition <strong>unicellularity\/pluricellularity<\/strong> was acquired independently several times (King\u00a0<span class=\"CitationRef\"><a title=\"View reference\" role=\"button\" href=\"https:\/\/link.springer.com\/article\/10.1007\/s00427-012-0399-3#CR65\" aria-pressed=\"false\" aria-haspopup=\"true\" aria-controls=\"popup-references\">2004<\/a><\/span>). The a<strong>cquisition of multicellularity implies the emergence of cellular cohesion and means of communication<\/strong>, as well as molecular mechanisms enabling the <strong>control of morphogenesis and body plan patterning<\/strong>.<\/pre>\n<p style=\"text-align: justify;\">ERESKOVSKY, Alexander V.; RENARD, Emmanuelle; BORCHIELLINI, Carole. <a href=\"https:\/\/link.springer.com\/article\/10.1007\/s00427-012-0399-3\" target=\"_blank\" rel=\"noopener noreferrer\">Cellular and molecular processes leading to embryo formation in sponges: evidences for high conservation of processes throughout animal evolution<\/a>. Development Genes and Evolution, v. 223, n. 1-2, p. 5-22, 2013.<\/p>\n<\/blockquote>\n<p>Aqui, aparentemente, a pluricelularidade aparece como mais complexa:<\/p>\n<blockquote>\n<pre style=\"text-align: justify;\">These results concerning the P. mirabilis biologic oscillator are of broad significance since they demonstrate how the supramolecular behaviour of macromolecules promotes complex embedded dynamic cycles which root the evolution from unicellularity to multicellularity <strong>and, eventually, to pluricellularity<\/strong>: the permanent osmotic force allows polysaccharides self-organization to promote cyclic dissipative structures.<\/pre>\n<p style=\"text-align: justify;\">LAHAYE, \u00c9lodie et al. <a href=\"https:\/\/pubs.rsc.org\/en\/content\/articlelanding\/2014\/an\/c4an00618f#!divAbstract\" target=\"_blank\" rel=\"noopener noreferrer\">A multi-scale approach of the mechanisms underlying exopolysaccharide auto-organization in the Proteus mirabilis extracellular matrix<\/a>. Analyst, v. 139, n. 19, p. 4879-4886, 2014.<\/p>\n<\/blockquote>\n<p>Novamente, multicelular como organismo mais complexo (capaz de formar tecidos):<\/p>\n<blockquote>\n<pre style=\"text-align: justify;\">The popular term protist is retained to describe eukaryotes with a unicellular level of organisation, without cell differentiation into tissues. Where vegetative cell differentiation occurs in protists, it is restricted to sexual reproduction, alternate vegetative morphology, and quiescent or resistant stages, such as cysts. In other words, task sharing by tissues, a property of multicellular species, does not occur in protists. Based on this new definition, we clearly recognize that some algae are multicellular. Protist morphology is varied and includes single independent cells that may or may not be motile, filamentous species, colonial (linked by a common stalk, or sheath, or cytoplasmic extensions), sheets of cells (phyllose), and parenchymatous or otherwise attached cells.<\/pre>\n<p style=\"text-align: justify;\">ADL, S et al.(2005), The New Higher Level Classification of Eukaryotes with Emphasis on the Taxonomy of Protists. Journal of Eukaryotic Microbiology, 52: 399-451. doi:10.1111\/j.1550-7408.2005.00053.x<\/p>\n<\/blockquote>\n<p>Novamente, pluricelularidade como agregados simples (col\u00f4nias) e a multicelularidade como complexa:<\/p>\n<blockquote>\n<pre style=\"text-align: justify;\">Conditions that resemble <strong>multicellularity<\/strong>, and which <strong>we term pluricellularity<\/strong>, evolved independently in several lineages of unicellular organisms. <strong>Pluricellularity is used to<\/strong> embrace such multi-individual types of organization as <strong>colony formation, filament formation and aggregation<\/strong>. Why distinguish between multi- and pluricellularity? Because the former produces a single, many-celled organism, and the latter is the coming together of single-celled individuals, as in colony formation. Growth regulation, cell-cell recognition systems and modes of cooperation differ fundamentally in the two conditions. Different forms of pluricellularity evolved within bacteria; some aggregate, some are colonial, while others are filamentous. So, we distinguish multi-from pluricellularity.<\/pre>\n<p>Brian Keith Hall; Benedikt Hallgr\u00edmsson; Monroe W. Strickberger (2008). <a href=\"https:\/\/trove.nla.gov.au\/work\/26802186?q&amp;versionId=32287015\" target=\"_blank\" rel=\"noopener noreferrer\">Strickberger&#8217;s evolution: the integration of genes, organisms and populations (4th ed.)<\/a>. Hall\/Hallgr\u00edmsson. p. 149. ISBN 978-0-7637-0066-9.<\/p><\/blockquote>\n<\/div><\/div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<div class=\"mh-excerpt\"><p>Uma not\u00edcia agitou as p\u00e1ginas esta semana. A raz\u00e3o? A empolga\u00e7\u00e3o toda foi causada por uma publica\u00e7\u00e3o na prestigiada Nature que teria demonstrado a origem da multicelularidade.<\/p>\n<\/div>","protected":false},"author":1,"featured_media":5853,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25],"tags":[302,635,636,654,745,746],"class_list":["post-5722","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-geral","tag-divulgacao-cientifica","tag-multicelular","tag-multicelularidade","tag-nature","tag-pluricelular","tag-pluricelularidade"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Origem da Multicelularidade ou Propaganda Enganosa? &raquo; Portal TDI Brasil +<\/title>\n<meta name=\"description\" content=\"Uma not\u00edcia agitou as p\u00e1ginas esta semana. A raz\u00e3o? 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