First-pass extracted concept

PiggyBac transposon-mediated transgene integration

Candidate: toolkit itemType: engineering method1 source documents4 linked claims

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Aliases

PiggyBac, PiggyBac transposon system

Extracted Explainers

What the tool is doing

PiggyBac is used here as a transposon-based system to insert ChR2 or hM4Di transgenes into human iPSCs. The abstract states that genomic integration succeeded in both HEK293T cells and iPSCs.

Source 1DOI PubMed

Resources required

The abstract supports a need for PiggyBac transposon-based transgene delivery and receptor constructs such as ChR2 or hM4Di in human iPSCs. Evaluation also required promoter methylation and expression measurements.

Source 1DOI PubMed

What problem it solves

It provides a way to integrate optogenetic or chemogenetic receptor genes into iPSCs for building modifiable cells.

Source 1DOI PubMed

What it does not solve

It does not solve transgene silencing in iPSCs, because expression was absent even in some hypomethylated clones.

Source 1DOI PubMed

Alternatives

The paper contrasts PiggyBac with CRISPR/Cas9 targeting of the AAVS1 safe harbor.

Source 1DOI PubMed

Evidence Snippets

Here, we used ... PiggyBac transposon systems to insert optogenetic and chemogenetic receptors (ChR2/hM4Di) into human iPSCs.

Evidence 1Source 1DOI PubMedprovenance

Supporting Sources

Source 1primary paper2026MEDDOI PubMed

1 evidence snippet 4 linked claims Claim 1 Claim 2 Claim 3

Linked Claims

Claim 1engineering outcomesupports2026Source 1DOI PubMed

CRISPR/Cas9 targeting AAVS1 and PiggyBac both enabled genomic integration of ChR2 and hM4Di transgenes in HEK293T cells and human iPSCs.

Quoted textsource-backed

While both systems successfully integrated genes into the genomes of HEK293T cells and iPSCs

Claim 2epigenetic associationsupports2026Source 1DOI PubMed

In PiggyBac-engineered iPSCs, CMV and EF1α promoter methylation varied by integration site.

Quoted textsource-backed

For PiggyBac, the methylation of CMV/EF1α promoters in iPSCs exhibited integration site-dependent variability (0-95.2%).

Claim 3expression outcomesupports2026Source 1DOI PubMed

Despite successful genomic integration, receptor expression was detected only in HEK293T cells and not in human iPSCs.

Quoted textsource-backed

receptor expression was detected only in HEK293T cells

Claim 4mechanistic inferencesupports2026Source 1DOI PubMed

Failure of gene expression in hypomethylated PiggyBac clones suggests that methylation-independent silencing mechanisms also contribute in human iPSCs.

Quoted textsource-backed

Notably, even hypomethylated clones failed to show gene expression, suggesting that additional regulatory mechanisms, such as histone modifications or chromatin remodeling, may contribute to transcriptional silencing.