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Genetic Testing for a Patient with Suspected 3 Beta-Hydroxysteroid Dehydrogenase Deficiency: A Case of Unreported Genetic Variants. J Clin Med 2022; 11:jcm11195767. [PMID: 36233635 PMCID: PMC9573289 DOI: 10.3390/jcm11195767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Revised: 09/12/2022] [Accepted: 09/26/2022] [Indexed: 11/23/2022] Open
Abstract
3beta-hydroxysteroid dehydrogenase type II deficiency (HSD3B2 deficiency), a rare form of congenital adrenal hyperplasia (CAH), is characterized by varying degrees of salt loss and incomplete masculinization in males and mild virilization or normal external genitalia in females. We report the case of a patient (46XY) showing salt loss and incomplete masculinization, markedly elevated levels of 17OHP (17 hydroxyprogesterone), ACTH (Adreno Cortico Tropic Hormone), testosterone and delta4androstenedione (delta4A), low levels of cortisol and absence of bone skeletal alterations that frequently characterize POR (Cytochrome P450 oxidoreductase) deficiency. Mutation analysis by Sanger sequencing of the HSD3B2 gene showed that the patient presented with a compound heterozygote for two novel variants c.370A>G p.Ser124Gly and c.308-6 G>A. The two HSD3B2 gene variants were also present in the patient’s older brother showing only incomplete masculinization. The in silico analysis revealed a probable damaging effect of c.370A>G p.Ser124Gly: residue p.Ser124 is highly conserved among species and seems to be located in the catalytic site of the enzyme, playing a pivotal role in NAD(H) binding to its substrate. Intronic c.308-6G>A variant is predicted to be likely pathogenic; the substitution seems to cause a change in the splice acceptor site located 6bp downstream of the variant. The two siblings seem to be affected by 3β-HSD2 deficiency; nevertheless, the two novel variants are likely to cause variable expressivity of the disease.
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Guran T, Kara C, Yildiz M, Bitkin EC, Haklar G, Lin JC, Keskin M, Barnard L, Anik A, Catli G, Guven A, Kirel B, Tutunculer F, Onal H, Turan S, Akcay T, Atay Z, Yilmaz GC, Mamadova J, Akbarzade A, Sirikci O, Storbeck KH, Baris T, Chung BC, Bereket A. Revisiting Classical 3β-hydroxysteroid Dehydrogenase 2 Deficiency: Lessons from 31 Pediatric Cases. J Clin Endocrinol Metab 2020; 105:5707567. [PMID: 31950145 DOI: 10.1210/clinem/dgaa022] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Accepted: 01/13/2020] [Indexed: 02/10/2023]
Abstract
CONTEXT The clinical effects of classical 3β-hydroxysteroid dehydrogenase 2 (3βHSD2) deficiency are insufficiently defined due to a limited number of published cases. OBJECTIVE To evaluate an integrated steroid metabolome and the short- and long-term clinical features of 3βHSD2 deficiency. DESIGN Multicenter, cross-sectional study. SETTING Nine tertiary pediatric endocrinology clinics across Turkey. PATIENTS Children with clinical diagnosis of 3βHSD2 deficiency. MAIN OUTCOME MEASURES Clinical manifestations, genotype-phenotype-metabolomic relations. A structured questionnaire was used to evaluate the data of patients with clinical 3βHSD2 deficiency. Genetic analysis of HSD3B2 was performed using Sanger sequencing. Novel HSD3B2 mutations were studied in vitro. Nineteen plasma adrenal steroids were measured using LC-MS/MS. RESULTS Eleven homozygous HSD3B2 mutations (6 novel) were identified in 31 children (19 male/12 female; mean age: 6.6 ± 5.1 yrs). The patients with homozygous pathogenic HSD3B2 missense variants of > 5% of wild type 3βHSD2 activity in vitro had a non-salt-losing clinical phenotype. Ambiguous genitalia was an invariable feature of all genetic males, whereas only 1 of 12 female patients presented with virilized genitalia. Premature pubarche was observed in 78% of patients. In adolescence, menstrual irregularities and polycystic ovaries in females and adrenal rest tumors and gonadal failure in males were observed. CONCLUSIONS Genetically-documented 3βHSD2 deficiency includes salt-losing and non-salt-losing clinical phenotypes. Spared mineralocorticoid function and unvirilized genitalia in females may lead to misdiagnosis and underestimation of the frequency of 3βHSD2 deficiency. High baseline 17OHPreg to cortisol ratio and low 11-oxyandrogen concentrations by LC-MS/MS unequivocally identifies patients with 3βHSD2 deficiency.
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Affiliation(s)
- Tulay Guran
- Department of Pediatric Endocrinology and Diabetes, School of Medicine, Marmara University, Istanbul, Turkey
| | - Cengiz Kara
- Department of Pediatric Endocrinology and Diabetes, Ondokuz Mayis University, Samsun, Turkey
| | - Melek Yildiz
- Department of Pediatric Endocrinology and Diabetes, Kanuni Sultan Suleyman Training and Research Hospital, Istanbul, Turkey
| | - Eda C Bitkin
- Department of Pediatric Endocrinology and Diabetes, Ondokuz Mayis University, Samsun, Turkey
| | - Goncagul Haklar
- Department of Biochemistry, School of Medicine, Marmara University, Istanbul, Turkey
| | - Jen-Chieh Lin
- Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan
| | - Mehmet Keskin
- Department of Pediatric Endocrinology and Diabetes, Gaziantep University, Gaziantep, Turkey
| | - Lise Barnard
- Department of Biochemistry, Stellenbosch University, Western Cape, South Africa
| | - Ahmet Anik
- Department of Pediatric Endocrinology and Diabetes, School of Medicine, Aydin Adnan Menderes University, Aydin, Turkey
| | - Gonul Catli
- Department of Pediatric Endocrinology and Diabetes, School of Medicine, Katip Celebi University, Izmir, Turkey
| | - Ayla Guven
- Pediatric Endocrinology, Health Science University, Faculty of Medicine, Zeynep Kamil Women and Children Diseases Education and Research Hospital, Istanbul, Turkey
| | - Birgul Kirel
- Department of Pediatric Endocrinology, Eskisehir Osmangazi University, Eskisehir, Turkey
| | - Filiz Tutunculer
- Department of Pediatrics, Division of Pediatric Endocrinology, Trakya University School of Medicine, Edirne, Turkey
| | - Hasan Onal
- Department of Pediatric Endocrinology and Diabetes, Kanuni Sultan Suleyman Training and Research Hospital, Istanbul, Turkey
| | - Serap Turan
- Department of Pediatric Endocrinology and Diabetes, School of Medicine, Marmara University, Istanbul, Turkey
| | - Teoman Akcay
- Department of Pediatric Endocrinology and Diabetes, Istinye University Medical Park Gaziosmanpasa Hospital, Istanbul, Turkey
| | - Zeynep Atay
- Department of Pediatric Endocrinology and Diabetes, School of Medicine, Marmara University, Istanbul, Turkey
| | - Gulay C Yilmaz
- Department of Pediatric Endocrinology and Diabetes, Ondokuz Mayis University, Samsun, Turkey
| | - Jamala Mamadova
- Department of Pediatric Endocrinology and Diabetes, Ondokuz Mayis University, Samsun, Turkey
| | - Azad Akbarzade
- Department of Pediatric Endocrinology and Diabetes, School of Medicine, Marmara University, Istanbul, Turkey
| | - Onder Sirikci
- Department of Biochemistry, School of Medicine, Marmara University, Istanbul, Turkey
| | - Karl-Heinz Storbeck
- Department of Biochemistry, Stellenbosch University, Western Cape, South Africa
| | - Tugba Baris
- Gelisim Genetik Tani Merkezi, Istanbul, Turkey
| | - Bon-Chu Chung
- Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan
| | - Abdullah Bereket
- Department of Pediatric Endocrinology and Diabetes, School of Medicine, Marmara University, Istanbul, Turkey
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Krzeminska P, Nizanski W, Nowacka-Woszuk J, Switonski M. Analysis of testosterone pathway genes in dogs (78,XY; SRY-positive) with ambiguous external genitalia revealed a homozygous animal for 2-bp deletion causing premature stop codon in HSD17B3. Anim Genet 2019; 50:705-711. [PMID: 31476086 DOI: 10.1111/age.12850] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/23/2019] [Indexed: 12/12/2022]
Abstract
The genetic background of disorders of sex development (DSD) in dogs with a normal male sex chromosome set (78,XY) is poorly described. In this study, we present for the first time, an analysis of six genes of the testosterone pathway, encoding enzymes (CYP17A1, HSD3B2, HSD17B3, SRD5A2) and transcription factors (NR5A1, AR). The entire coding sequence and flanking regions of the introns, 5'-UTR and 3'-UTR were analyzed in five DSD dogs (78,XY, SRY-positive) with ambiguous external genitalia and in 15 control dogs. A homozygous deletion of 2 bp in exon 2 of HSD17B3 (hydroxysteroid 17-beta dehydrogenase 3) was found in a Dachshund dog with enlarged clitoris, vulva and abdominal gonads and decreased serum testosterone level. In silico analysis revealed that this deleterious variant causes truncation of the encoded polypeptide (from 306 to 65 amino acids) and deprivation of the active site of the encoded enzyme. Genotyping of 23 control Dachshund dogs showed a normal homozygous genotype. Thus, we assumed that the 2-bp deletion is the causative variant. Moreover, 24 SNPs (four in CYP17A1, three in HSD3B2, six in HSD17B3, five in SRD5A2, one in AR and five in NR5A1), two intronic indels (one in HSD3B2 and one in SRD5A2) and two microsatellite polymorphisms in exon 1 of AR were found. Six SNPs appeared to be novel. No association with DSD phenotype was observed. Identification of the first case of DSD in domestic animals caused by a deleterious variant of a gene involved in testosterone synthesis showed that these genes are important candidates in such studies.
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Affiliation(s)
- P Krzeminska
- Department of Genetics and Animal Breeding, Poznan University of Life Sciences, Wolynska 33, 60-637, Poznan, Poland
| | - W Nizanski
- Department of Reproduction and Clinic of Farm Animals, Wroclaw University of Environmental and Life Sciences, Plac Grunwaldzki 49, 50-366, Wroclaw, Poland
| | - J Nowacka-Woszuk
- Department of Genetics and Animal Breeding, Poznan University of Life Sciences, Wolynska 33, 60-637, Poznan, Poland
| | - M Switonski
- Department of Genetics and Animal Breeding, Poznan University of Life Sciences, Wolynska 33, 60-637, Poznan, Poland
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