首页> 美国卫生研究院文献>American Journal of Human Genetics >A Recurrent RNA-Splicing Mutation in the SEDL Gene Causes X-Linked Spondyloepiphyseal Dysplasia Tarda
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A Recurrent RNA-Splicing Mutation in the SEDL Gene Causes X-Linked Spondyloepiphyseal Dysplasia Tarda

机译:SEDL基因中的复发性RNA剪接突变导致X连锁脊柱骨赘发育不良。

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摘要

Spondyloepiphyseal dysplasia tarda (SEDL) is a genetically heterogeneous disorder characterized by mild-to-moderate short stature and early-onset osteoarthritis. Both autosomal and X-linked forms have been described. Elsewhere, we have reported the identification of the gene for the X-linked recessive form, which maps to Xp22.2. We now report characterization of an exon-skipping mutation (IVS3+5G→A at the intron 3 splice-donor site) in two unrelated families with SEDL. Using reverse transcriptase (RT)–PCR, we demonstrated that the mutation resulted in elimination of the first 31 codons of the open reading frame. The mutation was not detected in 120 control X chromosomes. Articular cartilage from an adult who had SEDL and carried this mutation contained chondrocytes with abundant Golgi complexes and dilated rough endoplasmic reticulum (ER). RT-PCR experiments using mouse/human cell hybrids revealed that the SEDL gene escapes X inactivation. Homologues of the SEDL gene include a transcribed retropseudogene on chromosome 19, as well as expressed genes in mouse, rat, Drosophila melanogaster Caenorhabditis elegans, and Saccharomyces cerevisiae. The latter homologue, p20, has a putative role in vesicular transport from ER to Golgi complex. These data suggest that SEDL mutations may perturb an intracellular pathway that is important for cartilage homeostasis.
机译:迟发性脊椎骨赘发育不良(SEDL)是一种遗传异质性疾病,其特征是轻度至中度的矮小身材和早发的骨关节炎。已经描述了常染色体和X-连锁形式。在其他地方,我们已经报道了X连锁隐性形式的基因鉴定,该基因映射到Xp22.2。我们现在报告在两个与SEDL无关的家族中外显子跳跃突变(内含子3剪接供体位点处的IVS3 + 5G→A)的表征。使用逆转录酶(RT)-PCR,我们证明了该突变导致消除了开放阅读框的前31个密码子。在120个对照X染色体中未检测到突变。来自患有SEDL并携带此突变的成年人的关节软骨包含软骨细胞,该软骨细胞具有丰富的高尔基复合体和扩张的粗糙内质网(ER)。使用小鼠/人类细胞杂种的RT-PCR实验表明SEDL基因逃脱了X灭活作用。 SEDL基因的同源物包括19号染色体上的转录逆转录假基因,以及小鼠,大鼠,黑腹果蝇秀丽隐杆线虫和酿酒酵母中的表达基因。后者的同系物p20在从ER到高尔基复合体的囊泡转运中具有假定的作用。这些数据表明SEDL突变可能会干扰对软骨动态平衡很重要的细胞内途径。

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