What is the connection between genes (DNA) & phenotype? IOW, how, exactly, do genes determine who we are? Proteins, Proteins, Proteins! Many are structural.

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Presentation transcript:

What is the connection between genes (DNA) & phenotype? IOW, how, exactly, do genes determine who we are? Proteins, Proteins, Proteins! Many are structural in nature, but most traits are determined by enzymes (or lack thereof!) Transcription & translation link genes to proteins DNA  RNA  protein transcription translation

One gene, one-enzyme hypothesis Proposed by Garod, 1909 Confirmed by Beadle & Tatum, 1930 –Worked w/ neurospora (bread mold) mutants –Modified to one gene, one polypeptide

Overview

The Triplet Code 3 bases on DNA specify a particular amino acid A gene contains enough triplet codes to specify a particular polypeptide chain,along with regulatory DNA

The genetic code Refers specifically to mRNA codons –Complementary to DNA triplets Universal Degenerate Wobble DNA- CCA/GGT/TTT/CGA RNA- GGU/CCA/AAA/GCU Aminos - gly/pro/lys/ala

DNA- CCA/GGT/TTT/CGA m RNA- GGU/CCA/AAA/GCU tRNA- CCA/GGU/UUU/CGA Aminos - gly/ pro/ lys/ ala

Transcription-mRNA synthesis 3 stages-initiation, elongation, termination Catalyzed by RNA polymerase(synthesizes 5’  3’) DNA is organized into Transcription units (genes) –Initiation sequence, triplet codes for polypeptide, termination Per gene, only one strand of DNA is transcribed(template, anti-sense) –Which strand may vary from gene to gene

initiation 1.RNA pol binds to promoter Promoter includes binding site & initiation site 2.RNA pol unzips DNA & begins Putting Complementary bases in place

elongation New strand is built in 3’ to 5’ direction Uracil instead of thymine Uses nucleoside triphosphates

termination Terminator sequence (DNA) Signals end of polypeptide RNA pol dissociates, DNA zips up, mRNA released

Eukaryotes vs prokaryotes In nucleus Promoter includes the TATA box (for transcription factors) Transcription units only contain info for1 polypeptide chain mRNA must be processed before translation In cytoplasm No TATA box or transcription factors Transcription units may contain info for several different polypeptide chains, but have 1 set of regulators No mRNA processing Translation can take place simultaneously w/ transcription

RNA processing Methylguanosine “cap” added to 5’end –Protection,Ribosomal attachment Poly-A tail added to 3’ end –Protection,Transport to cytoplasm INTRONS (intervening sequences) cut out EXONS left & spliced together –Spliceosomes-proteins (enzymes) & RNA Alternative RNA processing

RNAi (interference) Post-transcriptional gene silencing Short Double-stranded RNA (siRNA) triggers degradation of homologous mRNA –May be protective (proofreading) research

The Anti-Codon Complementary to codons Found on tRNA –“cloverleaf” shape –Attachment site for amino acid –Anti codon at opposite end 1 tRNA per amino acid –Aminoacyl tRNA synthetase –Inosine (U,C, or A)

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