Mammalian polyadenylation sites: implications for differential display

Area of Science:

• Molecular Biology
• Genetics

Background:

• Differential display is a technique used to identify differences in gene expression.
• It relies on anchored primers to segment mRNA populations.

Purpose of the Study:

• To investigate the impact of dinucleotide frequency on differential display efficiency.
• To analyze the occurrence and implications of mispriming during reverse transcription in differential display.

Main Methods:

• Analysis of several hundred mammalian mRNA sequences.
• Confirmation of dinucleotide frequency variations.
• Examination of anchored primer behavior and mispriming events during reverse transcription.

Main Results:

• Dinucleotide frequency preceding the poly(A) tail varies, but less than 3-fold in mammalian mRNA.
• Variations in dinucleotide frequency did not affect the number of displayed bands.
• Mispriming at the anchor region and internal mispriming were identified as common issues.
• Repetitive sampling due to mispriming extensively occurs in differential display.

Conclusions:

• Reverse transcriptase mispriming is a significant factor that can reduce the efficiency of differential display.
• The findings suggest that anchored primer promiscuity contributes to mispriming during reverse transcription.