فرضية عالم الحمض النووي الريبوزي: الفرق بين النسختين

 

اقتُرِح مفهوم عالم الرنا أول مرة سنة 1962 بواسطة [[ألكسندر ريتش]] <ref name="Neveu et al">{{cite journal | vauthors = Neveu M, Kim HJ, Benner SA | title = The "strong" RNA world hypothesis: fifty years old | journal = Astrobiology | volume = 13 | issue = 4 | pages = 391–403 | date = Apr 2013 | pmc = | doi = 10.1089/ast.2012.0868 | pmid = 23551238 | bibcode = 2013AsBio..13..391N |quote=[The RNA world's existence] has broad support within the community today.}}</ref>، وصيغ المصطلح بواسطة [[ولتر غيلبرت]] سنة 1986 <ref name="Cech2012">{{cite journal | vauthors = Cech TR | title = The RNA worlds in context | journal = Cold Spring Harbor Perspectives in Biology | volume = 4 | issue = 7 | pages = a006742 | date = Jul 2012 | pmid = 21441585 | pmc = 3385955 | doi = 10.1101/cshperspect.a006742 }}</ref>، كما اقتُرحت فرضيات طرق كيميائية بديلة للحياة على الأرض <ref name="NC-20150316">{{cite journal | vauthors = Patel BH, Percivalle C, Ritson DJ, Duffy CD, Sutherland JD | title = Common origins of RNA, protein and lipid precursors in a cyanosulfidic protometabolism | journal = Nature Chemistry | volume = 7 | issue = 4 | pages = 301–7 | date = Apr 2015 | pmid = 25803468 | pmc = 4568310 | doi = 10.1038/nchem.2202 | url = http://www.nature.com/nchem/journal/v7/n4/full/nchem.2202.html | bibcode = 2015NatCh...7..301P }}</ref> ويمكن أن لا تكون الحياة المعتمِدة على الرنا أول أشكال الحياة وجودا <ref name="Cech2012" /><ref name="Robertson2012">{{cite journal | vauthors = Robertson MP, Joyce GF | title = The origins of the RNA world | journal = Cold Spring Harbor Perspectives in Biology | volume = 4 | issue = 5 | pages = a003608 | date = May 2012 | pmid = 20739415 | pmc = 3331698 | doi = 10.1101/cshperspect.a003608 }}</ref>، ورغم ذلك فإن الأدلة على فرضية عالم الرنا قوية كفاية لتلقى الفرضية قبولا واسعا. <ref name="Neveu et al" /><ref name="NYT-20150504">{{cite news |last=Wade |first=Nicholas |authorlink=Nicholas Wade |title=Making Sense of the Chemistry That Led to Life on Earth |url=https://www.nytimes.com/2015/05/05/science/making-sense-of-the-chemistry-that-led-to-life-on-earth.html |date=May 4, 2015 |work=[[نيويورك تايمز]] |accessdate=May 10, 2015 |deadurl=no |archiveurl=https://web.archive.org/web/20170709115606/https://www.nytimes.com/2015/05/05/science/making-sense-of-the-chemistry-that-led-to-life-on-earth.html |archivedate=July 9, 2017 |df= }}</ref><ref>{{cite journal | vauthors = Copley SD, Smith E, Morowitz HJ | title = The origin of the RNA world: co-evolution of genes and metabolism | journal = Bioorganic Chemistry | volume = 35 | issue = 6 | pages = 430–43 | date = Dec 2007 | pmc = | doi = 10.1016/j.bioorg.2007.08.001 | pmid = 17897696 |quote=The proposal that life on Earth arose from an RNA World is widely accepted.}}</ref>

 

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