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High prevalence of Bardet-Biedl syndrome in La Réunion Island is due to a founder variant in ARL6/BBS3.
Clinical Genetics ( IF 2.9 ) Pub Date : 2020-05-03 , DOI: 10.1111/cge.13768
Aurélie Gouronc 1 , Vincent Zilliox 2 , Marie-Line Jacquemont 3 , Françoise Darcel 4 , Anne-Sophie Leuvrey 1 , Elsa Nourisson 1 , Manuela Antin 1 , Jean-Luc Alessandri 5 , Bérénice Doray 6 , Paul Gueguen 6 , Frédérique Payet 6 , Hanitra Randrianaivo 3 , Corinne Stoetzel 7 , Sophie Scheidecker 1, 7 , Hugues Flodrops 8 , Hélène Dollfus 7, 9, 10 , Jean Muller 1, 2, 7
Affiliation  

Bardet‐Biedl syndrome (BBS) is a rare ciliopathy with variable retinal dystrophy, polydactyly, renal abnormalities, obesity, cognitive impairment, and hypogonadism. Biallelic pathogenic variants have been identified in 24 genes, leading to BBS in an autosomal recessive inheritance pattern. In this study, we investigated a cohort of 16 families (20 individuals) presenting with typical BBS originating from La Réunion Island using sequencing (Sanger and high‐throughput methods) and SNP array. In eight families (12 individuals) we identified the same ARL6/BBS3 variation [c.535G > A, p.(Asp179Asn)]. Bioinformatics and functional analyses revealed an effect of this variant on the splicing of ARL6 /BBS3 . Owing to the relatively high frequency of this variant, a possible founder effect was suspected. Genotyping of six individuals revealed a common 3.8‐Mb haplotype and estimated the most recent common ancestor to about eight generations confirmed by the known genealogy. Knowledge of this founder effect modifies our diagnostic strategy and enables a personalized genetic counseling for patients from La Réunion Island. Being the first description of BBS patients from La Réunion Island, we could estimate its prevalence between ~1/45000 and ~ 1/66000 individuals.

中文翻译:

拉留尼汪岛Bardet-Biedl综合征的高患病率归因于ARL6 / BBS3中的创始人变异。

Bardet-Biedl综合征(BBS)是一种罕见的睫状体病,具有可变的视网膜营养不良,多指畸形,肾脏异常,肥胖,认知障碍和性腺功能减退。已经在24个基因中鉴定出双等位基因致病变体,从而以常染色体隐性遗传方式导致BBS。在这项研究中,我们使用测序(Sanger和高通量方法)和SNP阵列,调查了16个家族(20个个体)的队列,这些群体具有源自拉留尼昂岛的典型BBS 。在八个家庭(12个个体)中,我们鉴定出相同的ARL6 / BBS3变异[c.535G> A,p。(Asp179Asn)]。生物信息学和功能分析表明该变体对ARL6 / BBS3的剪接有影响。。由于该变体的相对较高的频率,怀疑可能有创始者效应。对六位个体的基因分型显示出一个常见的3.8-Mb单倍型,并通过已知的家谱学证实了最新的共同祖先大约有八代。对这种创始效应的了解改变了我们的诊断策略,并为来自留尼汪岛的患者提供了个性化的遗传咨询。作为对留尼汪岛BBS患者的首次描述,我们可以估计其患病率在〜1/45000和〜1/66000之间。
更新日期:2020-05-03
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