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Hwang DY, Hung CC, Riepe FG, Auchus RJ, Kulle AE, Holterhus PM, Chao MC, Kuo MC, Hwang SJ, Chen HC. CYP17A1 intron mutation causing cryptic splicing in 17α-hydroxylase deficiency. PLoS One 2011; 6:e25492. [PMID: 21966534 PMCID: PMC3180445 DOI: 10.1371/journal.pone.0025492] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2011] [Accepted: 09/06/2011] [Indexed: 11/19/2022] Open
Abstract
17α-hydroxylase/17, 20-lyase deficiency (17OHD) is an autosomal recessive disease causing congenital adrenal hyperplasia and a rare cause of hypertension with hypokalemia. The CYP17A1 gene mutation leads to 17OHD and its clinical features. We described an 18 y/o female with clinical features of 17α-hydroxylase/17, 20-lyase deficiency and characterized the functional consequences of an intronic CYP17A1 mutation. The coding regions and flanking intronic bases of the CYP17A1 gene were amplified by PCR and sequenced. The patient is a compound heterozygote for the previously described p.R358X and IVS1 +2T>C mutations. A first intron splice donor site mutation was re-created in minigene and full-length expression vectors. Pre-mRNA splicing of the variant CYP17A1 intron was studied in transfected cells and in a transformed lymphoblastoid cell line. When the full-length CYP17A1 gene and minigene containing the intronic mutation was expressed in transfected cells, the majority (>90%) of mRNA transcripts were incorrectly spliced. Only the p.R358X transcript was detected in the EBV-transformed lymphoblastoid cell line. The IVS1 +2T>C mutation abolished most 17α-hydroxylase/17, 20-lyase enzyme activity by aberrant mRNA splicing to an intronic pseudo-exon, causing a frame shift and early termination.
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Affiliation(s)
- Daw-Yang Hwang
- Division of Nephrology, Department of Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Chi-Chih Hung
- Division of Nephrology, Department of Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Felix G. Riepe
- Division of Pediatric Endocrinology, Department of Pediatrics, Christian Albrechts University, Kiel, Germany
| | - Richard J. Auchus
- Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan, United States of America
| | - Alexandra E. Kulle
- Division of Pediatric Endocrinology, Department of Pediatrics, Christian Albrechts University, Kiel, Germany
| | - Paul-Martin Holterhus
- Division of Pediatric Endocrinology, Department of Pediatrics, Christian Albrechts University, Kiel, Germany
| | - Mei-Chyn Chao
- Division of Genetics, Endocrinology and Metabolism, Department of Pediatrics, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
- Department of Medical Genetics, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Mei-Chuan Kuo
- Division of Nephrology, Department of Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
- Faculty of Renal Care, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Shang-Jyh Hwang
- Division of Nephrology, Department of Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
- Faculty of Renal Care, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
- * E-mail:
| | - Hung-Chun Chen
- Division of Nephrology, Department of Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
- Faculty of Renal Care, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
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