2 $ fô & Ä$Ï ñ&g - 京都大学ocw
TRANSCRIPT
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1.2. ↓
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• DNA 々 (self replication)(nucleodide) mRNA ㌹ (transcription(polypeptide) ゼ(translation
• mRNA DNA ㌹ (reversetranscription)
DNA(Sequence ofnucleotides)
mRNA(Sequence ofnucleotides)
Polypeptide(Sequence of amino acids)
transcription translationreplication
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㌹
• ┞ (A-U, T-A, G-C, C-G) DNAmessenger RNA (mRNA)
• DNA (sense strand 3’ ’) ㌹(antisense strand) DNA々
• RNA㌹ (RNA polymerase) DNA promoter DNA よ ㌹ ㌹
mRNA DNA• RNA㌹ ㌹ (terminator) ㌹
A:adenin:U:uracilG:guanineC:thymine
A T C C G T A T C G C T A A
U A G G C A U A G C G A U U
5’3’
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D.L. /E.W./ ┐ゼ
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AAAA
• ┷ ㌹ RNA mRNA• 5’❻ Cap• 3’❻ Poly-A tail• さ ( intron) (
exon) ( splicing) ゼmRNA
5’ Cap 3’
AAAA5’ Cap 3’mRNA
splicing
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• mRNA (codon)• (triplet)• 64 61 AUG
UAA, UAG, UGA nonsense• 々 degeneracy•• mRNA よ
U U U U U U U U U U U U U U U U U U U U U
Phe PhePhe Phe PhePhe Phe
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Phe
Leu
Leu
Ile
Met
Val
Ser
Ser
Pro
Thr
Ala
Tyr
StopStop
Stop
Cys
Trp
Arg
Arg
GlyAsp
Asp
His
Gln
Lys
Glu
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• mRNA (ribosome) 々transfer RNA (tRNA) -tRNA ㎲
- tRNA DNA ㌹(anticodon) 3
• ㈻ribosomal RNA (rRNA)
• ゼ mRNA AUG UAA, UAG, UGA• mRNA 々 ゼ
• 3 mRNA• -tRNA tRNA
ゼ
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A U G C C C G A A G A A G A A C C C C C C G A AG G GG G G
Glu
C U U
GluGlu
GluPro
Met
ProPro
C U U
Peptide bond
mRNA
tRNA
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• mRNA mRNAt-RNA ㎲
よ
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↓
↓
• Silent mutationAGG CGG
• Neutral mutationAAA AGA
• Missense mutationGAG GUG
• Nonsense mutation ㈻CAG UAG
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• 3 ゼ(frame shift)
A U G A A U C U C U U U G U G G G U A G G
insertion
deletion
A U G A A U G C U C U U U G U G G G U A G G
Met Asn Leu Phe Val Gly Arg
Met Asn Ala Leu Cys Gly Stop
A U G A A U U C U U U G U G G G U A G GMet Asn
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Sickle-cell anaemia
Haemoglobin2 αpolypetides (141 amino acids)
2 βpolypetides (146 amino acids)
β-chainHbA (normal): Val-His-Leu-Thr-Pro-Glu-Glu-
GTGCACCTGACTCCTGAGGAG
HbS (abnormal): Val-His-Leu-Thr-Pro-Val-Glu- GTGCACCTGACTCCTGTGGAG
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↓
• ↓ ↓• ↓ ↓
• ↓↓ 100
↓• ↓ ↓• X α β γ ㈻
↓ ↓mutagen
• ↓ ⒬ ㈻(carcinogen• ↓• ↓
• ↓ DNA
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• DNA freeradical DNA
• ↓ ┞
• DNA thymine dimerDNA ㌹ 々
• っ
• 5-BU DNA ㎲ ぞ
A=T A=BUA=T
G BU
G C
A=BU
substitution
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• DNA
• 々proofreading, mismatch repair,
photoreactivating enzyme, excisionrepair DNA々
• オ ┞
error-prone DNA々trasnlesion
DNA synthesis• 々 ↓
↓
G
DNA polymerase
Proofreading