GMU:BioArt WS16/Cloning

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Dolly the Sheep

Paper reporting that there are no ageing problems in among SCNT clones (“Healthy ageing of cloned sheep”, http://www.nature.com/articles/ncomms12359)

Cloning

“The traditional technique for gene cloning involves the transfer of a DNA fragment of interest from one organism to a self-replicating genetic element, such as a bacterial plasmid. This technique is commonly used today for isolating long or unstudied genes and protein expression. A more recent technique is the use of polymerase chain reaction (PCR) for amplifying a gene of interest. The advantage of using PCR over traditional gene cloning, as described above, is the decreased time needed for generating a pure sample of the gene of interest.”(http://www.bio-rad.com/en-us/applications-technologies/introduction-gene-cloning-analysis) And “The fundamental difference between the two methods is that molecular cloning involves replication of the DNA in a living microorganism, while PCR replicates DNA in an in vitro solution, free of living cells.”(https://en.wikipedia.org/wiki/Molecular_cloning)

Natural Cloning

“Cloning is a natural form of reproduction that has allowed life forms to spread for more than 50 thousand years. It is the reproduction method used by plants, fungi, and bacteria.”(https://en.wikipedia.org/wiki/Cloning) (See for example here: http://www.instructables.com/id/Clone-a-tomato-plant-and-fill-your-garden-for-FRE/?ALLSTEPS)

Molecular cloning

“Commonly used to amplify DNA fragments containing whole genes, but it can also be used to amplify any DNA sequence such as promoters, non-coding sequences and randomly fragmented DNA.”(https://en.wikipedia.org/wiki/Cloning)

“Cloning of any DNA fragment essentially involves four steps:

• fragmentation - breaking apart a strand of DNA
• ligation - gluing together pieces of DNA in a desired sequence
• transfection - inserting the newly formed pieces of DNA into cells
• screening/selection - selecting out the cells that were successfully transfected with the new DNA”

Cell cloning

“Cloning a cell means to derive a population of cells from a single cell. In the case of unicellular organisms such as bacteria and yeast, this process is remarkably simple and essentially only requires the inoculation of the appropriate medium. However, in the case of cell cultures from multi-cellular organisms, cell cloning is an arduous task as these cells will not readily grow in standard media.”(https://en.wikipedia.org/wiki/Cloning)

“Somatic-cell nuclear transfer, known as SCNT, can also be used to create embryos”(https://en.wikipedia.org/wiki/Cloning)

Organism cloning

“Organism cloning (also called reproductive cloning) refers to the procedure of creating a new multicellular organism, genetically identical to another.”(https://en.wikipedia.org/wiki/Cloning)

Enzymes for the preparation of protoplasts

Enzymes accelerate, or catalyze, chemical reactions

Protoplasts refer to the entire cell, excluding the cell wall

“Cell walls are made of a variety of polysaccharides. Protoplasts can be made by degrading cell walls with a mixture of the appropriate polysaccharide-degrading enzymes:”(https://en.wikipedia.org/wiki/Protoplast)

Type of cell	Enzyme
Plant cells	Cellulase, pectinase, xylanase
Gram-positive bacteria	Lysozyme (+EDTA)
Fungal cells	Chitinase

Workshop 1 (DNA samples)

• 1. cutting out DNA samples from different flesh sorts (sausage)
• 2. putting samples into Eppendorf reaction tubes (Epi)
• 3. adding buffer (1000 ul) enzyme (100 ul) in a bigger epi tube in order to prepare mix for dissolving samples
• 4. divide 200 ul of mix into tubes with samples so it dissolves all other proteins and leaves only dna
• 5. putting samples into heating/cooling block for one hour with 56C

One hour later

• 6. transfer liquid to the bigger epic tubes
• 7. adding 200 ul of lüser puffer to the dissolved samples. brakes the walls of the cell (functions as washing medium)
• 8. adding 200 ul 100% ethanol in order to get DNA out
• 9. transferring the liquid into the adapter tubes with powder (Ionenaustauschchromatographie)
• 10. DIY centrifuge didn’t work (liquid was not getting through the powder); we need to find a faster solution; another solution found: we met Johannes in Fablab who offered his hand and the HU lab;
• 11. 3 centrifuge cycles with different buffer; the last one with water in order to have dna in the final sample
• 12. polymerase master mixer (half of the total mix; 15ul; from one dna makes more dna) + sample (10ul) + primer forward (2,5ul) + primer reverse (2,5ul)

Workshop 2 (Gel electroforese chamber)

• 1. cutting out from plastic box
• 2. preparing screws
• 3. preparing 1% agarose (agarose, tne, destiled water)
• 4. pouring agarose solution into the chamber
• 5. cutting out endings of agarose for screws (screws get hot when letting electricity through and therefore it needs liquid outside)
• 6. pouring the liquid (distiled water + the solution; no agarose)
• 7. pipetting dna ladder for measurements into the first gel pocket
• 8. pipetting samples with colouring (instead of colour one could use 40% glicerol so the samples sink into the gel pockets) into the remaining gel pockets
• 9. waiting 40 min

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Workshop 3 (Cloning plants)

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