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NF1 exon 7 skipping and sequence alterations in exonic splice enhancers (ESEs) in a neurofibromatosis 1 patient.

Abstract：

:The underestimates of NF1 gene mutations in neurofibromatosis 1 (NF1) have been attributed to the large size of the NF1 gene, the considerable frequency of gross deletions and the common occurrence of splicing defects that are only detectable by cDNA analysis. We here report on a patient with severe NF1 showing at RT-PCR analysis the expected fragment from exon 4b to 8 together with a shortened one with the in-frame skipping of exon 7. Sequencing of the corresponding genomic fragment revealed a G-->A transition and a C-->A transversion at nucleotide positions 57 and 58 of the 174-bp long exon 7, neither of which was present in the proband's parents or 50 healthy controls. No other variation was found in the entire NF1 coding sequence. The use of previously established sequence matrices for the scoring of putative ESE motifs showed that the adjacent silent and missense mutations are located within highly conserved overlapping stretches of seven nucleotides with a close similarity to the ESE-specific consensus sequences recognised by the SC35 and SF2/ASF SR proteins. The combined occurrence of both consecutive alterations decreases the motif score for both SF2/ASF and SC35 below their threshold levels. As the aberrant transcript is consistently expressed, a protein lacking 58 amino acids is predicted. Thus the contiguous internal exon 7 mutations are suggested to cause exon 7 skipping as a result of the mis-splicing caused by abrogation of functional ESEs.

journal_name

Hum Genet

journal_title

Human genetics

authors

Colapietro P,Gervasini C,Natacci F,Rossi L,Riva P,Larizza L

doi

10.1007/s00439-003-1009-2

keywords:

subject

Has Abstract

pub_date

2003-11-01 00:00:00

pages

551-4

issue

6

eissn

0340-6717

issn

1432-1203

journal_volume

113

pub_type

杂志文章

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