Gene editing using ssODNs with engineered endonucleases.

Area of Science:

• Molecular Biology
• Genetics
• Biotechnology

Background:

• Gene editing relies on engineered nucleases like CRISPR/Cas9 to create DNA double-stranded breaks (DSBs).
• DSBs in mammalian cells are repaired via nonhomologous end joining (NHEJ) or homology-directed repair (HDR).
• HDR offers precise repair but traditionally requires complex plasmid donor constructs.

Purpose of the Study:

• To present a simplified method for precise genome modification.
• To demonstrate the utility of single-stranded oligodeoxynucleotides (ssODNs) as DNA donors in gene editing.
• To combine ssODNs with engineered endonucleases for efficient gene editing.

Main Methods:

• Utilized engineered endonucleases (e.g., ZFNs, TALENs, CRISPR/Cas9) to induce targeted DSBs.
• Employed single-stranded oligodeoxynucleotides (ssODNs) as homologous DNA donors for the HDR pathway.
• Co-delivered engineered endonucleases and ssODN donors for genome modification.

Main Results:

• Successfully achieved defined genome modifications using ssODNs as donors.
• ssODNs obviated the need for laborious plasmid vector construction.
• Demonstrated a more streamlined approach to gene editing via HDR.

Conclusions:

• Single-stranded oligodeoxynucleotides are effective DNA donors for precise gene editing.
• This ssODN-based approach simplifies and accelerates genome modification protocols.
• The method offers a viable alternative to traditional plasmid-based HDR gene editing.