Functional analysis of BBS3 A89V that results in non-syndromic retinal degeneration.

Functional analysis of BBS3 A89V that results in non-syndromic retinal degeneration.
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DOI:
10.1093/hmg/ddr039
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发表时间:
2011-04-15
影响因子:
3.5
通讯作者:
Slusarski DC
Slusarski DC
中科院分区:
生物学2区
文献类型:
--
作者:
Pretorius PR;Aldahmesh MA;Alkuraya FS;Sheffield VC;Slusarski DC

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Bardet-Biedl综合征(BBS)是视网膜变性的综合征形式。最近,纯合性定位与一个血缘家庭与孤立的视网膜色素变性确定了一个错义突变BBS 3,一个已知的BBS基因。BBS 3中的突变编码位置89处从丙氨酸到缬氨酸的单个氨基酸变化。由于这种氨基酸在广泛的脊椎动物中是保守的,我们利用斑马鱼模型系统来功能性地表征BBS 3 A89 V突变。在斑马鱼中bbs 3的敲低改变了细胞内转运,这是在斑马鱼中所有BBS基因敲低的情况下观察到的表型,以及视觉障碍。在这里,我们发现BBS 3 A89 V足以挽救由BBS 3缺失引起的转运延迟,表明这种突变不影响BBS 3的功能,因为它与综合征性疾病有关。然而,BBS 3L A89 V无法挽救视力障碍,这突出了BBS 3中一种特定氨基酸的作用,这种氨基酸是视觉功能所必需的,但在其他细胞类型中是不可缺少的。这些数据有助于我们理解为什么BBS 3 A89 V错义突变的患者只出现孤立的视网膜色素变性。
Bardet–Biedl syndrome (BBS) is a syndromic form of retinal degeneration. Recently, homozygosity mapping with a consanguineous family with isolated retinitis pigmentosa identified a missense mutation in BBS3, a known BBS gene. The mutation in BBS3 encodes a single amino acid change at position 89 from alanine to valine. Since this amino acid is conserved in a wide range of vertebrates, we utilized the zebrafish model system to functionally characterize the BBS3 A89V mutation. Knockdown of bbs3 in zebrafish alters intracellular transport, a phenotype observed with knockdown of all BBS genes in the zebrafish, as well as visual impairment. Here, we find that BBS3 A89V is sufficient to rescue the transport delays induced by the loss of bbs3, indicating that this mutation does not affect the function of BBS3 as it relates to syndromic disease. BBS3L A89V, however, was unable to rescue vision impairment, highlighting a role for a specific amino acid within BBS3 that is necessary for visual function, but dispensable in other cell types. These data aid in our understanding of why patients with the BBS3 A89V missense mutation only present with isolated retinitis pigmentosa.
DOI: 10.1002/ajmg.1320520208
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发表时间: 1989-10-12
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