Investigating the mechanism of chromosomal deletion: characterization of 39 deletion breakpoints in introns 47 and 48 of the human dystrophin gene.

Abstract:

:The region of the dystrophin gene containing introns 45-50 is characterized by a high rate of recombination events that give rise to large deletions causing dystrophinopathy. The nucleotide sequence of this intronic region has recently been released in GenBank. With the aim of further understanding the mechanism favoring the occurrence of these deletions, we have characterized the distribution of introns 47 and 48 deletion endpoints in 39 dystrophinopathy patients. In 14 of these patients we were able to sequence the break junction. On these sequences we were able to identify several intronic motifs that could predispose to DNA double-strand breaks. Our results, combined with other literature data, show that unequal homologous recombination is a very poorly represented event in the dystrophin gene, whereas junction features are suggestive of a model of recombination in which DNA double-strand breaks are incorrectly repaired by a nonhomologous end-joining mechanism. The correlation among recombination rate, deletion frequency, and percentage of repetitive elements is discussed.

journal_name

Genomics

journal_title

Genomics

authors

Toffolatti L,Cardazzo B,Nobile C,Danieli GA,Gualandi F,Muntoni F,Abbs S,Zanetti P,Angelini C,Ferlini A,Fanin M,Patarnello T

subject

Has Abstract

pub_date

2002-11-01 00:00:00

pages

523-30

issue

5

eissn

0888-7543

issn

1089-8646

pii

S0888754302968618

journal_volume

80

pub_type

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