Versatile derivatisation of solid support media for covalent bonding on DNA-microchips

Area of Science:

• Biochemistry
• Materials Science
• Molecular Biology

Background:

• DNA arrays are crucial for genomics and diagnostics.
• Current surface chemistries face limitations in loading capacity and stability.
• Efficient immobilization of nucleic acids is key for array performance.

Purpose of the Study:

• To develop a versatile surface chemistry for DNA arrays.
• To enable both covalent immobilization and in situ synthesis of nucleic acids.
• To improve loading capacity and nucleic acid accessibility for hybridization.

Main Methods:

• Development of a novel dendrimeric linker molecule for surface functionalization.
• Covalent attachment of pre-fabricated nucleic acids (oligonucleotides, PCR products, PNA oligomers).
• In situ synthesis of nucleic acids directly on glass or polypropylene surfaces.

Main Results:

• Stable covalent bonding achieved, withstanding over 30 stripping cycles.
• Dendrimeric linker allows controlled modification and increased loading capacity without compromising hybridization efficiency.
• Surface properties like charge and hydrophobicity can be modulated.
• Nucleic acid attachment primarily via terminal groups ensures full molecule accessibility for hybridization.

Conclusions:

• The developed chemistry offers a versatile platform for DNA array fabrication.
• It supports diverse nucleic acid types and array formats, enhancing performance and applicability.
• This approach provides a robust and adaptable solution for advanced molecular diagnostics and research.