A complex genomic abnormality found in a patient with antithrombin deficiency and autoimmune disease-like symptoms

作者：Kato Io; Takagi Yuki; Ando Yumi; Nakamura Yuki; Murata Moe; Takagi Akira; Murate Takashi; Matsushita Tadashi; Nakashima Tadaaki; Kojima Tetsuhito^*

来源：International Journal of Hematology, 2014, 100(2): 200-205.

DOI：10.1007/s12185-014-1596-9

• Genome rearrangement
• Antithrombin deficiency
• SEPINC1
• RC3H1

Hereditary antithrombin (AT) deficiency is an autosomal dominant thrombophilic disorder caused by SERPINC1 abnormality. In the present study, we analyzed SERPINC1 in a Japanese patient with AT deficiency and autoimmune disease-like symptoms. Direct sequencing and multiplex ligation-dependent probe amplification revealed that the patient was hemizygous for the entire SERPINC1 deletion. Single nucleotide polymorphism genotyping, gene dose measurement, and long-range polymerase chain reaction (PCR) followed by mapping PCR and direct sequencing of the long-range PCR products revealed that the patient had an approximately 111-kb gene deletion from exon 2 of ZBTB37 to intron 5 of RC3H1, including the entire SERPINC1 in chromosome 1. We also found a 7-bp insertion of an unknown origin in the breakpoint, which may be a combination of three parts with a few base-pair microhomologies, resulting from a replication-based process known as 'fork stalling and template switching'. Because RC3H1, which encodes the protein roquin is involved in the repression of self-immune responses, the autoimmune disease-like symptoms of the patient may have resulted from this gene defect. In conclusion, we identified an entire SERPINC1 deletion together with a large deletion of RC3H1 in an AT-deficient patient with autoimmune disease-like symptoms.

• 出版日期2014-8