家畜細胞遺傳 -...
TRANSCRIPT
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家畜細胞遺傳朱有田
References:1. Lodish et al. 2000. Molecular cell biology (4th edition). W. H.
Freeman and company. New York.2. Hartwell et al. 2000. Genetics: from genes to genomes.
McGraw-Hill co. New York. 3. Robertson. 1987. Teratocarcinomas and embryonic stem cells. IRL
Press. Oxford. England.4. Rooney. 2001. Human cytogenetics: constitutional analysis. Oxford
university press. New York
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Dolly
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Dollay and cal
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Classical Genetics = Gregor Mendel (1865)1: Simple organism: garden pea2: Repeat self-pollination … Bred true3: The trait could be determined unambiguously
Dominant and Recessive
4. Analysis of large number of descendant of his experimental crosses
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Checkpoint
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Tumor formation
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Embryonic stem (ES) cells
1/100-1/10000
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The culture of embryonal carcinoma (EC) cells - thestem cells of teratocarcinomas
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Fluorescence
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Formation of ES cells carrying a knockout mutation
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General procedure for producinggene-targeted knockout mice
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Dolly
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Eukaryotic cell cyclecytokinesis
9 h
10 h
4.5 h
0.5 h
Postmitotic cells:“exit” the cell cycleG0. ------ Neuron
Restriction pointthe point in late G1 where passage throughthe cell cycle become independent of mitogens
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Most bacterial chromosome are circular with onereplication origion
1. Charge repulsion:spermine and spermidine(polyamines)
2. Small protein (H-NS =15.6 kDa)
3. Tightly supercoiled
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A, B and Z form DNA
B-DNA (in vivo):In physiological condition (low salt)
A-DNA (in vivo):DNA-RNA or RNA-RNA heteroduplexes
Z-DNA (in vitro):G=C or C=G
A, B and Z form DNA
TopoisomeraseDNA gyrase
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Structure ofnecleosome
Histone: N-terminal20-40 residue containing positivelycharged lysine groups
Acetylation and deacetylation ofspecific lysines
Acetylation of histone N-terminireduces chromatin condensation
CH3COO-
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Methylation
Methylases
Demethylases
2-7% of C
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10
2p2: chromosome 2, short arm, region 2
2p25: chromosome 2, short arm, region 2,band 5
Banding nomenclature:
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Eukaryotic chromosome : Molecular anatomy
1. What is the structure of DNA
3. What feature of the structure DNA facilitate the accurate transmission of genetic information from generation to generation
2. What form is the genetic information
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Dosage compensation
Constitutive heterochromatin
Facultative heterochromatin The entire chromosome isthe target for regulation
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YAC (yeast artificial chromosome)
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Organelle DNAsThe size and coding capacity of mtDNA vary considerably in differentorganism
16.5 Kb
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Prion -- Sheep, scrapie
New Guinea --Kuru
Mad cow
Prion ---PrPc / PrPsc
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Prion
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