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Related Experiment Video

Updated: Feb 24, 2026

Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues
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Directionality bias in T/A cloning.

Valeria Dountcheva1, Athanasios Bubulya2, Labib Rouhana1

  • 1Department of Biology, University of Massachusetts Boston, Boston, MA, USA.

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|February 23, 2026
PubMed
Summary
This summary is machine-generated.

T/A cloning, a common DNA plasmid technique, unexpectedly shows directional bias. This finding in a Course-based Undergraduate Research Experience (CURE) using the pGEM-T Vector System can save time and resources.

Keywords:
Class ActivitiesEducationGenetic ScreensMethodsOtherUndergraduate Research Experience

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Genomic Research

Background:

  • T/A cloning is a widely used method for creating recombinant DNA plasmids.
  • This technique utilizes single adenine-thymine (A:T) base pairs for insert ligation into vectors.
  • Theoretically, insert orientation during ligation is random.

Purpose of the Study:

  • To investigate the observed directionality bias in T/A cloning using the pGEM-T Vector System.
  • To quantify the extent of this bias in a Course-based Undergraduate Research Experience (CURE) setting.
  • To highlight the practical implications of this bias for molecular cloning efficiency.

Main Methods:

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

Main Results:

  • Consistently observed a significant directionality bias in insert ligation.
  • The bias favored "sense" orientation towards the T7 promoter in over 74% of clones.
  • Statistical analysis confirmed the significance of this bias (p-value < 0.0005).

Conclusions:

  • T/A cloning with the pGEM-T Vector System exhibits a predictable directionality bias.
  • Understanding this bias is crucial for optimizing cloning strategies.
  • Awareness of this phenomenon can reduce experimental time and costs in molecular biology research.