Insertion of LINE-1 Retrotransposon Inducing Exon Inversion Causes a Rotor Syndrome Phenotype

Insertion of LINE-1 Retrotransposon Inducing Exon Inversion Causes a Rotor Syndrome Phenotype
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插入 LINE-1 逆转录转座子诱导外显子倒转导致转子综合症表型

DOI:
10.3389/fgene.2019.01399
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发表时间:
2020-01
影响因子:
3.7
通讯作者:
Hong You
Hong You
中科院分区:
生物学3区
文献类型:
--
作者:
Donghu Zhou;Saiping Qi;Wei Zhang;Lina Wu;Anjian Xu;Xiaojin Li;Bei Zhang;Yanmeng Li;Siyu Jia;Hejing Wang;Jidong Jia;Xiaojuan Ou;Jian Huang;Hong You

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转子综合征是一种罕见的常染色体隐性遗传病,其特征是结合型高胆红素血症,是由SLCO 1B 1和SLCO 1B 3基因的双等位基因致病变异引起的。长散布核元件(LINES)占人类基因组的17%,LINE-1插入基因可导致遗传疾病。在本研究中,我们检测了SLCO 1B 1和SLCO 1B 3基因在两个中国患者诊断转子综合征的基础上实验室测试。在一名患者中,发现了一种新的外显子4倒位变异。这种变异可能是由LINE-1反转录转座子插入SLCO 1B 3内含子3诱导的,并使用基因组步移鉴定。剪接分析结果表明,外显子倒位,导致SLCO 1B 3外显子4(122 bp)的成熟mRNA的排斥,可能会产生一个提前终止密码子。在这里,我们描述了一个外显子倒位转子综合征的分子病因。我们的研究结果可能会为未来的诊断提供信息,并指导药物处方和遗传咨询。
Rotor syndrome, a rare autosomal-recessive genetic disorder characterized by conjugated hyperbilirubinemia, is caused by biallelic pathogenic variants in both SLCO1B1 and SLCO1B3 genes. Long interspersed nuclear elements (LINEs) make up about 17% of the human genome and insertion of LINE-1 in genes can result in genetic diseases. In the current study, we examined SLCO1B1 and SLCO1B3 genes in two Chinese patients diagnosed with Rotor syndrome based on laboratory tests. In one patient, a novel exon 4 inversion variant was identified. This variant may have been induced by LINE-1 retrotransposon insertion into SLCO1B3 intron 3, and was identified using genome walking. Splicing assay results indicated that the exon inversion, resulting in SLCO1B3 exon 4 (122 bp) exclusion in the mature mRNA, might generate a premature termination codon. Here, we describe an exon inversion contributing to the molecular etiology of Rotor syndrome. Our results may inform future diagnoses and guide drug prescriptions and genetic counseling.
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