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A molecular lesion or point lesion is damage to the structure of a biological molecule such as DNA, RNA, or protein. This damage may result in the reduction or absence of normal function, and in rare cases the gain of a new function. Lesions in DNA may consist of breaks or other changes in chemical structure of the helix, ultimately preventing transcription. Meanwhile, lesions in proteins consist of both broken bonds and improper folding of the amino acid chain. While many nucleic acid lesions are general across DNA and RNA, some are specific to one, such as thymine dimers being found exclusively in DNA. Several cellular repair mechanisms exist, ranging from global to specific, in order to prevent lasting damage resulting from lesions.

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  • Lesió molecular (ca)
  • Lesión molecular (es)
  • Molecular lesion (en)
  • Lesão molecular (pt)
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  • Una lesió molecular és un dany a l'estructura d'una molècula que resulta en la reducció o l'absència de les funcions normals, o, rarament, l'adquisició d'una nova funció. Concerneix les molècules biològiques com ara l'ADN, els enzims i les proteïnes. Les lesions de l'ADN consisteixen en trencaments en l'hèlix alfa, mentre que les lesions de les proteïnes consisteixen tant en enllaços trencats com en un plegament defectuós de la cadena d'aminoàcids. (ca)
  • Una lesión molecular es un tipo de daño a la estructura de una molécula biológica como ADN, enzimas, o proteínas que resultan en la reducción o ausencia de la función normal, o en casos especiales, la ganancia de una función nueva. Lesiones en ADN consisten de roturas y otros cambios en la estructura química de la hélice, mientras lesiones en proteínas consisten en enlaces rotos y en el doblar incorrecto del aminoácido. Ver reparación del ADN para métodos de reparar las lesiones moleculares. * Datos: Q6896010 (es)
  • A molecular lesion or point lesion is damage to the structure of a biological molecule such as DNA, RNA, or protein. This damage may result in the reduction or absence of normal function, and in rare cases the gain of a new function. Lesions in DNA may consist of breaks or other changes in chemical structure of the helix, ultimately preventing transcription. Meanwhile, lesions in proteins consist of both broken bonds and improper folding of the amino acid chain. While many nucleic acid lesions are general across DNA and RNA, some are specific to one, such as thymine dimers being found exclusively in DNA. Several cellular repair mechanisms exist, ranging from global to specific, in order to prevent lasting damage resulting from lesions. (en)
  • Lesão molecular ou ponto de lesão são danos na estrutura de uma molécula de DNA, enzimas, ou proteinas que reduzem ou anulam a sua função normal, ou em raros casos, desenvolvem uma nova função. (pt)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/DNA_orbit_animated.gif
  • http://commons.wikimedia.org/wiki/Special:FilePath/BER_basic_pathway.svg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Recombinational_repair_of_DNA_double-strand_damage.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Thymine_photodimer.svg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Types_of_DNA_Damage.jpg
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