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Ophthalmic Genet. 2012 Mar;33(1):18-22. doi: 10.3109/13816810.2011.620055. Epub 2011 Oct 17.

Differentiating Alström from Bardet-Biedl syndrome (BBS) using systematic ciliopathy genes sequencing.

Author information

1
Centre de Référence pour les Affections Rares en Génétique Ophtalmologique, CARGO, Hôpitaux Universitaires de Strasbourg, Strasbourg, France. k.aliferis@gmail.com

Abstract

INTRODUCTION:

Early onset retinal degeneration associated with obesity can present a diagnostic challenge in paediatric ophthalmology practice. Clinical overlap between Bardet-Biedl syndrome (BBS) and Alström syndrome has been described, although the two entities are genetically distinct. To date, 16 genes are known to be associated with BBS (BBS1-16) and only one gene has been identified for Alström syndrome (ALMS1).

MATERIALS AND METHODS:

In collaboration with the French National Center for Sequencing (CNS, Evry), all coding exons and flanking introns were sequenced for 27 ciliopathy genes (BBS1-12, MGC1203, TTC21b, AHI1, NPHP2-8 (NPHP6=BBS14), MKS1(BBS13), MKS3, C2ORF86, SDCCAG8, ALMS1) in 96 patients referred with a clinical diagnosis of BBS. ALMS1 gene analysis included sequencing of all coding exons.

RESULTS:

BBS known gene mutations were found in 44 patients (36 with two mutations and 8 heterozygous). ALMS1 mutations were found in four cases. The rate of ALMS1 mutations among patients suspected of having BBS was 4.2%.

DISCUSSION:

Clinically, all four patients presented early-onset severe retinal degeneration with congenital nystagmus associated with obesity. The difficult early differential diagnosis between the two syndromes is outlined. One mutation had already been reported (c.11310delAGAG/p.R3770fsX) and three were novel (c.2293C > T/p.Q765X, c.6823insA/p.R2275fsX, c.9046delA/p.N3016fsX).

CONCLUSIONS:

Ciliopathy genes sequencing can be very helpful in providing a timely diagnosis in this group of patients, hence appropriate genetic counselling for families and adequate medical follow-up for affected children.

PMID:
22004009
DOI:
10.3109/13816810.2011.620055
[Indexed for MEDLINE]

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