Transposable Element IS1 Intrinsically Generates Target Duplications of Variable Length

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1985 Feb 1

PMID 2983315

Citations 12

Authors

S Iida

W Arber

Affiliations

Soon will be listed here.

Abstract

Target duplication during transposition is one of the characteristics of mobile genetic elements. IS1, a resident insertion element of Escherichia coli K-12, was known to generate a 9-base-pair target duplication, while an IS1 variant, characterized by a nucleotide substitution in one of its terminal inverted repeats, was reported to duplicate 8 base pairs of its target during cointegration. We have constructed a series of transposons flanked by copies of either the normal or the variant IS1. The analysis of their transposition products revealed that transposons with normal termini as well as those with variant termini can intrinsically generate either 9- or 8-base-pair target duplications. We also observed that a normal IS1 from the host chromosome generated an 8-base-pair repeat. The possible relevance of the observation for the understanding of transposition processes and models to explain the variable length of target duplications are discussed.

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