BT301 ASSIGNMENT 2 SOLUTION SPRING 2021
Topic:
10 Key Difference between YAC and BAC Vectors.
Solution:
What are YAC vectors?
Vectors are used in molecular cloning. A vector can be defined as a DNA molecule that acts as a vehicle for the transport of foreign genetic material to another cell. A vector that contains foreign DNA is called recombinant DNA and must have the ability to replicate and express itself. The yeast artificial chromosome (YAC) and the bacterial artificial chromosome (BAC) are two types of vectors that are involved in cloning. Chromosome to insert large sections of genetic material into yeast cells, while BAC is an artificially constructed vector system that uses a specific region of E. coli. Chromosome to insert large segments of DNA into E. coli cells.
YAC (Yeast Artificial Chromosome) is an artificially constructed chromosome that has the ability to carry a large segment of foreign DNA and to replicate in yeast cells. It has a centromere, telomeres, and autonomously replicating sequences that are essential for replication and stability. YAC must also carry one or more selective markers and restriction sites to make it an efficient cloning vector. A large sequence from 1000 kb to 2000 kb can be inserted into YAC and transferred to yeast. The transformation efficiency of YAC is very low.
Figure: YAC Vector
What are BAC Vectors?
(BAC) is an artificially built chromosome for the purpose of molecular cloning. It has specific regions of E. coli F plasmid and it’s circular and supercoiled. BAC is made to clone DNA fragments to bacteria, with Special Emphasis on E. coli. It can tolerate DNA fragments with sizes up to 300 kb. Compared to YAC, BAC cloning inserts are smaller in size. BACs were first developed in 1992 and it is still famous for the reason of its stability and ease of construction.
BACs do also assist in developing vaccines.
Figure: BAC Vector Molecular in Cloning
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