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Directionality bias in T/A cloning.

Valeria Dountcheva1, Athanasios Bubulya2, Labib Rouhana1

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|April 23, 2026
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T/A cloning using the pGEM-T Vector System shows a significant directional bias in insert ligation, favoring the "sense" orientation. This finding in a Course-based Undergraduate Research Experience (CURE) impacts cloning efficiency.

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Genomic Research

Background:

  • T/A cloning is a common technique for creating recombinant DNA plasmids.
  • It utilizes single adenine-thymine (A:T) base pairs for insert ligation.
  • The expected outcome is random insert directionality relative to the vector.

Purpose of the Study:

  • To investigate the observed directionality bias in T/A cloning.
  • To quantify the extent of this bias using the pGEM-T Vector System.
  • To inform downstream applications in a Course-based Undergraduate Research Experience (CURE).

Main Methods:

  • Utilized the pGEM-T Vector System for T/A cloning.
  • Cloned over 400 DNA inserts.
  • Analyzed insert orientation relative to the T7 promoter.

Main Results:

  • Consistently observed a significant directionality bias in insert ligation.
  • The bias favored the "sense" orientation towards the T7 promoter.
  • Statistical analysis confirmed the bias with a p-value < 0.0005.

Conclusions:

  • T/A cloning with the pGEM-T Vector System is not random and exhibits directional bias.
  • Understanding this bias improves efficiency and reduces costs in molecular cloning.
  • This knowledge is valuable for CUREs and other research involving T/A cloning.