Molecular comparison of single cell MDA products derived from different cell types

Area of Science:

• Genomics
• Molecular Biology
• Biotechnology

Background:

• DNA quality from single cells is crucial for molecular analysis.
• Cell type and lysis methods significantly impact DNA yield and integrity.
• Multiple displacement amplification (MDA) is a key technique for amplifying limited DNA samples.

Purpose of the Study:

• To assess the efficiency and accuracy of MDA for different human cell types.
• To evaluate MDA-generated DNA quality for preimplantation genetic diagnosis (PGD).
• To compare MDA performance using a modified lysis protocol without dithiothreitol.

Main Methods:

• Single buccal cells, lymphocytes, and fibroblasts were subjected to MDA.
• DNA amplification was assessed using two multiplex PCR triplexes (DM and CF).
• Modified alkaline lysis buffer excluding dithiothreitol was employed.

Main Results:

• MDA amplification efficiency varied by cell type: 82% for buccal cells, 96% for lymphocytes, and 100% for fibroblasts.
• Average allele dropout (ADO) rates were 31% for buccal cells, 20.8% for lymphocytes, and 20% for fibroblasts.
• MDA on lymphocytes and fibroblasts yielded DNA suitable for PCR, comparable to blastomere results.

Conclusions:

• Modified MDA protocols provide sufficient DNA quality from single lymphocytes and fibroblasts for molecular analysis.
• Buccal cells are less suitable for MDA-based genetic analysis compared to lymphocytes and fibroblasts.
• MDA performance is cell-type dependent, impacting its utility in clinical PGD applications.