Frontiers in Genetics (Jan 2020)

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

  • Donghu Zhou,
  • Donghu Zhou,
  • Donghu Zhou,
  • Saiping Qi,
  • Saiping Qi,
  • Saiping Qi,
  • Wei Zhang,
  • Wei Zhang,
  • Wei Zhang,
  • Wei Zhang,
  • Lina Wu,
  • Lina Wu,
  • Lina Wu,
  • Lina Wu,
  • Anjian Xu,
  • Anjian Xu,
  • Anjian Xu,
  • Xiaojin Li,
  • Xiaojin Li,
  • Xiaojin Li,
  • Bei Zhang,
  • Bei Zhang,
  • Bei Zhang,
  • Yanmeng Li,
  • Yanmeng Li,
  • Yanmeng Li,
  • Siyu Jia,
  • Siyu Jia,
  • Siyu Jia,
  • Hejing Wang,
  • Hejing Wang,
  • Hejing Wang,
  • Jidong Jia,
  • Jidong Jia,
  • Jidong Jia,
  • Jidong Jia,
  • Xiaojuan Ou,
  • Xiaojuan Ou,
  • Xiaojuan Ou,
  • Xiaojuan Ou,
  • Jian Huang,
  • Jian Huang,
  • Jian Huang,
  • Jian Huang,
  • Jian Huang,
  • Hong You,
  • Hong You,
  • Hong You,
  • Hong You,
  • Hong You

DOI
https://doi.org/10.3389/fgene.2019.01399
Journal volume & issue
Vol. 10

Abstract

Read online

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.

Keywords