{"id":37786,"date":"2020-03-03T05:30:27","date_gmt":"2020-03-03T04:30:27","guid":{"rendered":"https:\/\/naturopatiadigital.eu\/?p=37786"},"modified":"2020-03-03T05:30:27","modified_gmt":"2020-03-03T04:30:27","slug":"37786","status":"publish","type":"post","link":"https:\/\/rina.naturopatiadigital.eu\/?p=37786","title":{"rendered":"\u00c1rea de conocimiento: Naturopat\u00eda Descriptiva: \u00abEstimaciones directas de la selecci\u00f3n natural en Iberia indican que la absorci\u00f3n de calcio no fue el \u00fanico impulsor de la persistencia de lactasa en Europa\u00bb"},"content":{"rendered":"<p><a href=\"https:\/\/1.bp.blogspot.com\/-ilhBDLtPSPA\/Xlvae22QrjI\/AAAAAAAAbFg\/-TNcgkrC79MEwOeTHsZQ1Y9eg7XwpAioACLcBGAsYHQ\/s1600\/Molecular_biology%2Band%2Bevolution.jpg\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignleft\" src=\"https:\/\/1.bp.blogspot.com\/-ilhBDLtPSPA\/Xlvae22QrjI\/AAAAAAAAbFg\/-TNcgkrC79MEwOeTHsZQ1Y9eg7XwpAioACLcBGAsYHQ\/s320\/Molecular_biology%2Band%2Bevolution.jpg\" width=\"243\" height=\"320\" border=\"0\" data-original-width=\"275\" data-original-height=\"362\" \/><\/a>Sverrisd\u00f3ttir, O. \u00d3., Timpson, A., Toombs, J., Lecoeur, C., Froguel, P., Carretero, J. M., &#8230; &amp; Thomas, M. G. (2014).<a href=\"https:\/\/academic.oup.com\/mbe\/article\/31\/4\/975\/1108992\">\u00a0Direct estimates of natural selection in Iberia indicate calcium absorption was not the only driver of lactase persistence in Europe<\/a>.\u00a0<i>Molecular biology and evolution<\/i>, 31(4), 975-983.<\/p>\n<p>CONTEXTO: La persistencia de lactasa (LP) es un rasgo gen\u00e9ticamente determinado mediante el cual la enzima lactasa se expresa a lo largo de la vida adulta. La lactasa es necesaria para la digesti\u00f3n de la lactosa, el principal carbohidrato en la leche, y su producci\u00f3n se regula a la baja despu\u00e9s del per\u00edodo de destete en la mayor\u00eda de los humanos y todos los dem\u00e1s mam\u00edferos estudiados. Varias fuentes de evidencia indican que la LP ha evolucionado independientemente, en diferentes partes del mundo durante los \u00faltimos 10,000 a\u00f1os, y ha sido objeto de una fuerte selecci\u00f3n natural en las poblaciones lecheras. En los europeos, la LP est\u00e1 fuertemente asociada con, y probablemente causada por, una sola mutaci\u00f3n de C a T 13,910 pb aguas arriba de la lactasa ( LCT) gen (-13,910 * T). A pesar de una considerable cantidad de investigaci\u00f3n, las razones por las cuales LP deber\u00eda proporcionar una ventaja selectiva tan fuerte siguen siendo poco conocidas.\u00a0<\/p>\n<p>OBJETIVO: En este estudio, examinamos una de las hip\u00f3tesis m\u00e1s ampliamente citadas para la selecci\u00f3n de LP: que el consumo de leche fresca complementaba el pobre estado de vitamina D y calcio de los primeros agricultores del norte de Europa (la hip\u00f3tesis de asimilaci\u00f3n de calcio)\u00a0<\/p>\n<p>M\u00c9TODO \/ DISE\u00d1O: Hacemos esto probando la selecci\u00f3n natural en -13,910 * T utilizando datos de ADN antiguos de los restos esquel\u00e9ticos de ocho individuos ib\u00e9ricos neol\u00edticos tard\u00edos, de quienes no esperar\u00edamos tener un estado pobre de vitamina D y calcio debido a los niveles de luz UVB incidentes relativamente altos.\u00a0<\/p>\n<p>RESULTADOS: Ninguna de las ocho muestras tipificadas con \u00e9xito en el estudio ten\u00eda el alelo T derivado. Adem\u00e1s, volvemos a analizar los datos publicados de restos neol\u00edticos franceses para evaluar la continuidad de la poblaci\u00f3n y examinar m\u00e1s a fondo la evoluci\u00f3n de LP en la regi\u00f3n. Usando simulaciones que acomodan la deriva gen\u00e9tica, la selecci\u00f3n natural, la incertidumbre en las fechas calibradas de radiocarbono y el error de muestreo, encontramos que la selecci\u00f3n natural todav\u00eda es necesaria para explicar el aumento observado en la frecuencia de los alelos.\u00a0<\/p>\n<p>CONCLUSI\u00d3N: Concluimos que la hip\u00f3tesis de asimilaci\u00f3n de calcio es insuficiente para explicar la propagaci\u00f3n del LP en Europa.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sverrisd\u00f3ttir, O. \u00d3., Timpson, A., Toombs, J., Lecoeur, C., Froguel, P., Carretero, J. M., &#8230; &amp; Thomas, M. G. (2014).\u00a0Direct estimates of natural selection in Iberia indicate calcium absorption was not the only driver of lactase persistence in Europe.\u00a0Molecular biology and evolution, 31(4), 975-983. CONTEXTO: La persistencia de lactasa (LP) es un rasgo gen\u00e9ticamente determinado [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-37786","post","type-post","status-publish","format-standard","hentry","category-naturopatia-descriptiva"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u00c1rea de conocimiento: Naturopat\u00eda Descriptiva: &quot;Estimaciones directas de la selecci\u00f3n natural en Iberia indican que la absorci\u00f3n de calcio no fue el \u00fanico impulsor de la persistencia de lactasa en Europa&quot; -<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rina.naturopatiadigital.eu\/?p=37786\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00c1rea de conocimiento: Naturopat\u00eda Descriptiva: &quot;Estimaciones directas de la selecci\u00f3n natural en Iberia indican que la absorci\u00f3n de calcio no fue el \u00fanico impulsor de la persistencia de lactasa en Europa&quot; -\" \/>\n<meta property=\"og:description\" content=\"Sverrisd\u00f3ttir, O. \u00d3., Timpson, A., Toombs, J., Lecoeur, C., Froguel, P., Carretero, J. M., &#8230; &amp; Thomas, M. G. (2014).\u00a0Direct estimates of natural selection in Iberia indicate calcium absorption was not the only driver of lactase persistence in Europe.\u00a0Molecular biology and evolution, 31(4), 975-983. 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