An alternate method for synthesis of double-stranded DNA segments

Area of Science:

• Molecular Biology
• Biochemistry
• Synthetic Biology

Background:

• Advances in chemical DNA synthesis allow for the creation of single-stranded DNA (ssDNA) over 40 bases.
• Efficient assembly of longer DNA segments is crucial for gene synthesis and cloning.

Purpose of the Study:

• To describe a novel methodology for the biochemical assembly of long gene segments from synthetic oligodeoxyribonucleotides.
• To demonstrate the application of this method in cloning a specific segment of human leukocyte interferon alpha 2.

Main Methods:

• Utilizing DNA polymerase I-mediated repair synthesis on synthetic oligonucleotide substrates with complementary 3' termini.
• Employing primer-template conversion to full-length double-stranded DNA (dsDNA) using DNA polymerase I and deoxyribonucleoside triphosphates.
• Assembling and cloning a 132-base pair gene segment of human leukocyte interferon alpha 2.

Main Results:

• Successful assembly and cloning of the target 132-base pair gene segment.
• Achieved a substantial reduction in chemical synthesis requirements, over 40% compared to conventional methods.
• Demonstrated the efficiency and cost-effectiveness of the described methodology.

Conclusions:

• The described DNA polymerase I-mediated repair synthesis offers an economical and efficient approach for assembling long gene segments.
• This method significantly reduces the chemical synthesis burden, facilitating the construction of complex DNA molecules.
• The methodology is applicable to the synthesis and cloning of various gene segments, including therapeutic proteins like interferon alpha 2.