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Genomics. 1992 Jul;13(3):594-600.

A transposon-like element in the deletion-prone region of the dystrophin gene.

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Institute for Molecular Genetics, Baylor College of Medicine, Houston, Texas 77030.


The central portion of the dystrophin gene locus is a preferential site for deletions causing progressive muscular dystrophy of the Duchenne type (DMD). The nucleotide sequence of a deletion junction fragment from a DMD patient was determined, revealing that the proximal breakpoint of the deletion in intron 43 fell within the sequence of a transposon-like element. This segment, belonging to the THE-1 family of human transposable elements, is normally present in a complete form in intron 43 of the dystrophin gene. The deletion mutation was maternally transmitted and eliminated two-thirds of the THE-1 element. Analysis of DNA from additional DMD patients revealed a second deletion with the proximal breakpoint mapping within the same THE-1 element.

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