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DNA-only Transposons

DNA-only Transposons

DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
The donor site from where the transposon is excised is either degraded or...

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Generating Transposon Insertion Libraries in Gram-Negative Bacteria for High-Throughput Sequencing

Generating Transposon Insertion Libraries in Gram-Negative Bacteria for High-Throughput Sequencing

Published on: July 7, 2020

Automated workflow for genotyping individual transposon library variants.

Lorea Alejaldre^1,2, Ana-Mariya Anhel^2,3, Lewis Grozinger¹

¹Systems Biology Department, Centro Nacional de Biotecnología (CSIC), Madrid 28049, Spain.

|March 23, 2026

Summary

This summary is machine-generated.

This study presents an automated workflow for genotyping transposon insertion libraries using open-source liquid handlers, reducing hands-on time and errors. The robust, scalable method enables reliable variant identification in genome engineering and synthetic biology.

Keywords:

Automation Genotyping Open-source liquid handling Standardization Transposon Workflow

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Area of Science:

Genome Engineering
Synthetic Biology
Laboratory Automation

Background:

High-throughput screening is crucial for genome engineering and synthetic biology but often relies on expensive equipment.
Genotyping individual clones in transposon libraries is labor-intensive, despite advances in population-level screening.
Open-source liquid handlers offer accessibility but require programming expertise or validated protocols.

Purpose of the Study:

To develop a step-by-step automated workflow for individual variant genotyping of transposon insertion libraries.
To address challenges of cost, programming expertise, and protocol availability in laboratory automation.
To utilize an open-source OT-2 liquid handler and a custom Python package for efficient and reproducible genotyping.

Main Methods:

An automated protocol with six modular steps: colony picking, counter-selection, PCR assays, and sequencing with custom Python annotation.
Utilized standardized vectors (SEVA guidelines) and Lab Automation Protocol (LAP) scripts for reproducibility.
Demonstrated workflow on a transposon insertion library in Pseudomonas putida KT2440.

Main Results:

Validated automated workflow for reliable genotyping of individual variants within 4-5 days.
Achieved successful identification of genomic insertion sites for 40 out of 46 variants with no spurious integrations detected.
Demonstrated the robustness, accessibility, and scalability of the open-source workflow.

Conclusions:

The automated workflow reliably reduces hands-on time and human error in genotyping.
Its modular and standardized design promotes protocol reuse, sharing, and broader access to open-source automation.
Provides a scalable and reproducible foundation for variant genotyping in genome engineering and synthetic biology.