Methods and compositions for producing 5' enriched cdna...

C - Chemistry – Metallurgy – 12 – N

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C12N 15/10 (2006.01) C12Q 1/68 (2006.01)

Patent

CA 2341298

Methods are provided for preparing a double-stranded cDNA corresponding to the 5' end of an mRNA. In the subject methods, an mRNA is first contacted with an oligo dT primer under first strand cDNA synthesis conditions. Next, the resultant hybrid is contacted with a random primer under first strand cDNA synthesis conditions, such that a cDNA complementary to the 5' end of the mRNA is produced. The resultant hybrid molecule is converted to two different double-stranded cDNAs, a first cDNA comprising the oligo dT primer and a second cDNA lacking the oligo dT primer. The two double-stranded cDNAs are then separated from each other. The subject methods find use in a variety of applications, and find particular use in the synthesis of 5' enriched cDNA libraries. Also provided are cDNA libraries produced by the subject methods, as well as kits for performing the subject methods.

L'invention concerne des procédés de préparation d'ADNc bicaténaire correspondant à l'extrémité 5' d'un ARNm. Selon les présents procédés, un ARNm est d'abord mis en contact avec une amorce oligo-dT dans des conditions de synthèse d'ADNc du premier brin. L'hybride qui en résulte est ensuite mis en contact avec une amorce aléatoire dans des conditions de synthèse d'ADNc du premier brin, de façon à produire un ADNc complémentaire à l'extrémité 5' de l'ARNm. La molécule hybride qui en résulte est transformée en deux ADNc double brin différents, un premier ADNc renfermant l'amorce oligo-dT et un second ADNc exempt de ladite amorce. Les deux ADNc double brin sont ensuite séparés. Les procédés sont utiles dans diverses applications, notamment dans la synthèse des banques d'ADNc enrichies de 5'. L'invention concerne également des banques d'ADNc produites au moyen des présents procédés, ainsi que des kits permettant de mettre en oeuvre lesdits procédés.

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