Curs 1 Str Genei

  • May 2020
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St ru ctu ra, an aliza s i lo caliza rea g en elo r 1. Structura (anatomia) genei 2. Gene mobile (transpozoni) 3. Inlantuirea genica (linkage) si Cartogafierea genetica

1. Structura genei

1. Structura genei  5’

– 3’ catena sens, codificatoare  3’ – 5’ catena anti-sens, matrice pentru ARNpm Matisarea (splicing, épissage) = excizia intronilor urmata de alipirea exonilor

1. Structura genei care codifica un polipeptid

1. Structura genei Factorii de transcriptie se fixeaza de CUTIILE PROMOTOARE :  TATA box (ATA pt. gena ß – globinei)  CAT box  CACC box  Cp G islands

1. Structura genei

1. Structura genei

1. Structura genei  ATG

= codonul initiator al transcriptiei, ce codifica metionina (aminoacid!), primul triplet din gena “structurala”, adica portiunea din gena a carei secventa se regaseste in ARNm

 TAA,

TAG, TGA = codoni STOP, marcheaza incheierea transcriptiei

1. Structura genei  Dinucleotidele:

GT = situs acceptor de matisare, - AG = situs donor de matisare, marginesc intronii. -

Structura CAP = 7 metil-guanozina, la capatul 3’ al ARNm

1. Structura genei

1. Structura genei  Pentru    

ca ARNpm sa devina ARNm:

matisare + CAP poliadenilarea capatului 3’ acoperirea cu un strat proteic protector

1. Structura genei

1. Structura genei care codifica un polipeptid

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