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Updated: May 29, 2026

Determination of the Optimal Chromosomal Location(s) for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach

Determination of the Optimal Chromosomal Location(s) for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach

Published on: September 11, 2017

Drosophila P elements preferentially transpose to replication origins.

Allan C Spradling¹, Hugo J Bellen, Roger A Hoskins

¹Department of Embryology, Carnegie Institution for Science, Baltimore, MD 21218, USA. spradling@ciwemb.edu

Proceedings of the National Academy of Sciences of the United States of America

|September 8, 2011

Summary

P transposable elements in Drosophila exploit replication origins to increase their copy number. These elements target specific gene promoters, revealing a novel mechanism for transposon proliferation and genomic spread.

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Determination of the Optimal Chromosomal Location(s) for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach

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Published on: June 7, 2024

Area of Science:

Molecular Biology
Genetics
Genomics

Background:

The P transposable element has recently spread through wild Drosophila melanogaster populations globally.
P element transposition, a 'cut-and-paste' mechanism, does not intrinsically amplify copy number, yet P elements multiply and spread within the genome.
P elements preferentially insert into gene promoters, but the reasons for this site specificity are not understood.

Purpose of the Study:

To investigate the molecular basis for P transposable element insertion site specificity in Drosophila melanogaster.
To determine the relationship between P element target sites and genomic features like replication origins and gene regulation.

Main Methods:

Analysis of P element insertion sites in Drosophila melanogaster.
Identification of DNA-binding proteins at target sites using cellular assays.
Functional characterization of insertion sites as replication origins.
Correlation of insertion site preference with replication timing and gene clustering.

Main Results:

P elements selectively target genomic sites that bind origin recognition complex (ORC) proteins in vitro.
These targeted sites function as active replication origins.
P element insertion sites are associated with specific promoters and are absent near clustered differentiation genes.
Insertion into unfired replication origins during S phase may facilitate P element repair and reduplication, increasing copy number.

Conclusions:

P transposable element site specificity is dictated by the binding of origin recognition complex proteins at replication origins within specific promoters.
The ability to be repaired and reduplicated at unfired replication origins during S phase explains P element copy number increase.
This mechanism provides a potential advantage for transposon proliferation and genomic spread, possibly contributing to associations between heterochromatin and late-replicating regions.