Cloning of human telomeres by complementation in yeast

Area of Science:

• Genetics
• Molecular Biology
• Cell Biology

Background:

• Telomeres are essential DNA sequences at chromosome ends, ensuring stability and complete replication.
• Telomeres consist of G-rich and C-rich strands, with conserved features across eukaryotes.
• Telomeric sequences from various organisms can function in yeast, suggesting conserved mechanisms.

Purpose of the Study:

• To clone human telomeres using a functional complementation assay in yeast.
• To identify and isolate human telomeric DNA fragments using a modified yeast artificial chromosome (YAC) vector.

Main Methods:

• Development of a modified YAC vector with a single telomere for cloning.
• Complementation of yeast with human telomeric DNA fragments.
• Identification of YACs containing human telomeres via hybridization with trypanosome telomeric repeat oligonucleotide.

Main Results:

• Successful cloning of human telomeres into yeast artificial chromosomes (YACs).
• Identification of YACs harboring human telomeric sequences using specific hybridization probes.
• Characterization of a cloned human fragment as immediately subtelomeric on at least one human chromosome.

Conclusions:

• Human telomeres can be functionally cloned and maintained in yeast using YAC technology.
• The study provides a method for isolating and studying human telomeric and subtelomeric DNA.
• This approach facilitates the genetic and molecular analysis of human chromosome ends.