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Deletions within COL11A1 in Type 2 stickler syndrome detected by multiplex ligation-dependent probe amplification (MLPA).


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Authors

Vijzelaar, Raymon 
Waller, Sarah 
Errami, Abdellatif 
Donaldson, Alan 
Lourenco, Teresa 

Abstract

BACKGROUND: COL11A1 is a large complex gene around 250 kb in length and consisting of 68 exons. Pathogenic mutations in the gene can result in Stickler syndrome, Marshall syndrome or Fibrochondrogenesis. Many of the mutations resulting in either Stickler or Marshall syndrome alter splice sites and result in exon skipping, which because of the exon structure of collagen genes usually leaves the message in-frame. The mutant protein then exerts a dominant negative effect as it co-assembles with other collagen gene products. To date only one large deletion of 40 kb in the COL11A1, which was detected by RT-PCR, has been characterized. However, commonly used screening protocols, utilizing genomic amplification and exon sequencing, are unlikely to detect such large deletions. Consequently the frequency of this type of mutation is unknown. CASE PRESENTATIONS: We have used Multiplex Ligation-Dependent Probe Amplification (MLPA) in conjunction with exon amplification and sequencing, to analyze patients with clinical features of Stickler syndrome, and have detected six novel deletions that were not found by exon sequencing alone. CONCLUSION: Exon deletions appear to represent a significant proportion of type 2 Stickler syndrome. This observation was previously unknown and so diagnostic screening of COL11A1 should include assays capable of detecting both large and small deletions, in addition to exon sequencing.

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Keywords

Adolescent, Adult, Child, Preschool, Collagen Type XI, Connective Tissue Diseases, Exons, Female, Gene Deletion, Gene Frequency, Humans, Infant, Male, Multiplex Polymerase Chain Reaction, Mutation, RNA Splicing, Sequence Analysis, DNA, Vitreous Detachment

Journal Title

BMC Med Genet

Conference Name

Journal ISSN

1471-2350
1471-2350

Volume Title

Publisher

Springer Science and Business Media LLC