Biology 318 Prokaryotic Genetics Review Vocabulary Phenotype: physical traits Genotype: genetic make-up Mutations: replication errors, single base pairs.

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Biology 318 Prokaryotic Genetics Review Vocabulary Phenotype: physical traits Genotype: genetic make-up Mutations: replication errors, single base pairs Recombination: rearranging or acquiring genes Since prokaryotes haploid (no meiosis/crossing over), how do they evolve? Five ways…

Mutations Naturally occur - replication, DNA Pol errors Rate - about 1 mistake per million base pairs Mutagens (chemicals, UV…) enhance error rate Mutations can be silent, harmful, or beneficial BOTH eukaryotes and prokaryotes show similar mutation rates, respond similarly to mutagens.

Application - Ames Testing, 1960 Mutagenicity is correlated with carcinogenicity Ames exposed Salmonella to various chemicals Counted # mutants - higher than normal? One of several safety tests used by FDA

Transformation - Griffith, 1928 Used 2 strains of Streptococcus pneumoniae Rough (capsule -) vs. virulent Smooth (+) Showed heat-lysing killed S, releasing DNA Which was taken up by live R, transforming to S This experiment = part of the evidence that showed DNA was the genetic material.

Conjugation - Lederberg, 1946 Requires bacteria have F plasmid, sex pilus F(+) donor sex pilus attaches to F(-) recipient Copy of F plasmid moves through pilus Recall: plasmids - including F - frequently carry emergency genes like antibiotic resistant.

Bacterial Viruses And how they contribute to bacterial evolution… Bacteriophage/Phage Unenveloped capsid with DNA only Bind Gram (-) host cell wall, inject DNA Borrow host DNA and RNA Pol, ribosomes Some virulent/lytic; others temperate/lysogenic Ubiquitous… including on you and in your gut!

SO - Lysogenic Conversion Bacteria acquire traits from lysogenic phage Acquired trait is viral - contrast with transduction Many diseases depend on phage gene factors...

Corynebacterium diphtheriae - Diphtheria Lysogen toxin halts eukaryotic ribosomes 2-5 days, gray pseudomembrane over throat Difficulty breathing, fatal heart problems Vaccinated for in US; still top 10 world killer 30-60% humans naturally carry phage-less bacteria in their nose/throats… protective???

Streptococcus pyogenes - Scarlet Fever Lysogen toxin - hyper-inflammation, rash, fever Typically follows pharyngitis, strawberry tongue Anti-bacterial drugs typically resolve in 1 week 10-30% humans naturally carry phage-less strains in their throats… protective???

Vibrio cholerae - Cholera Lysogen toxin - extreme salt/H2O loss, diarrhea 50% untreated victims die - “rice water stools” Food/water - marine, estuaries, shellfish, fish Water/salt replacement most effective treatment Not typically found in people, regular pandemics - many spread by shipping industry, bilges.

AND… Transduction During lysis, bacterial genome shredded Some fragments accidentally wind up in capsids Recombinant phage carry genes to next host In transduction, trait acquired FROM previous host BACTERIUM. Virus acts as CARRIER.

Retroviruses & Transduction During integration - pick up host cancer genes Carry to next host - transmit infectious cancer Rous Sarcoma Virus (1911) - chicken tumors HTLV - blood-transmitted form of leukemia Highest HTLV in Japan; many US studies searching for viral causes of other cancers.

US HTLV vs. blood donations - show infection rate does not correlate with donations; we do not screen for all strains.

Don’t forget individual lab assignment - Genetic Engineering/Gene Therapy (also Ch. 7)