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Margiotti K, Libotte F, Fabiani M, Mesoraca A, Giorlandino C. Digenic Origin of Difference of Sex Development in a Patient Harbouring DHX37 and MAMLD1 Variants. Case Rep Pediatr 2024; 2024:4896940. [PMID: 38962685 PMCID: PMC11221946 DOI: 10.1155/2024/4896940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 05/03/2024] [Accepted: 05/31/2024] [Indexed: 07/05/2024] Open
Abstract
Background The diagnostic process for identifying variations in sex development (DSD) remains challenging due to the limited availability of evidence pertaining to the association between phenotype and genotype. DSD incidence is reported as 2 in 10,000 births, and the etiology has been attributed to genetic causes. Case Presentation. The present study investigated genetic causes implicated in a case of a 15-year-old 46, XY patient, raised as a girl. Genetic analysis by clinical exome sequencing (CES) showed a digenic inheritance due to two known pathogenic mutations in the DHX37 gene and the MAMLD1 gene, while we excluded variants with pathogenic significance in 209 DSD-related genes. Conclusions Based on our literature review, this is the first case with the combined presence of pathogenic mutations in the MAMLD1 gene and DHX37 gene in a patient with gonadal dysgenesis.
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Affiliation(s)
- Katia Margiotti
- ALTAMEDICA, Human Genetics Lab, Viale Liegi 45, Rome 00198, Italy
| | | | - Marco Fabiani
- ALTAMEDICA, Human Genetics Lab, Viale Liegi 45, Rome 00198, Italy
| | - Alvaro Mesoraca
- ALTAMEDICA, Human Genetics Lab, Viale Liegi 45, Rome 00198, Italy
| | - Claudio Giorlandino
- ALTAMEDICA, Human Genetics Lab, Viale Liegi 45, Rome 00198, Italy
- ALTAMEDICA, Fetal-Maternal Medical Centre, Department of Prenatal Diagnosis, Viale Liegi 45, Rome 00198, Italy
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Faradz SMH, Listyasari N, Utari A, Ariani MD, Juniarto AZ, Santosa A, Ediati A, Rinne TK, Westra D, Claahsen-van der Grinten H, de Jong FH, Drop SLS, Ayers K, Sinclair A. Lessons Learned from 17 Years of Multidisciplinary Care for Differences of Sex Development Patients at a Single Indonesian Center. Sex Dev 2023; 17:170-180. [PMID: 37699373 PMCID: PMC11232949 DOI: 10.1159/000534085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Accepted: 09/08/2023] [Indexed: 09/14/2023] Open
Abstract
BACKGROUND Our multidisciplinary team (MDT) is a large specialized team based in Semarang, Indonesia, that cares for a wide variety of pediatric and adult individuals with differences of sex development (DSD) from across Indonesia. Here, we describe our work over the last 17 years. METHODS We analyzed phenotypic, hormonal, and genetic findings from clinical records for all patients referred to our MDT during the period 2004-2020. RESULTS Among 1,184 DSD patients, 10% had sex chromosome DSD, 67% had 46,XY DSD, and 23% had 46,XX DSD. The most common sex chromosome anomaly was Turner syndrome (45,X) (55 cases). For patients with 46,XY DSD under-masculinization was the most common diagnosis (311 cases), and for 46,XX DSD, a defect of Müllerian development was most common (131 cases) followed by congenital adrenal hyperplasia (CAH) (116 cases). Sanger sequencing, MLPA, and targeted gene sequencing of 257 patients with 46,XY DSD found likely causative variants in 21% (55 cases), with 13 diagnostic genes implicated. The most affected gene codes for the androgen receptor. Molecular analysis identified a diagnosis for 69 of 116 patients with CAH, with 62 carrying variants in CYP21A2 including four novel variants, and 7 patients carrying variants in CYP11B1. In many cases, these genetic diagnoses influenced the clinical management of patients and their families. CONCLUSIONS Our work has highlighted the occurrence of different DSDs in Indonesia. By applying sequencing technologies as part of our clinical care, we have delivered a number of genetic diagnoses and identified novel pathogenic variants in some genes, which may be clinically specific to Indonesia. Genetics can inform many aspects of DSD clinical management, and while many of our patients remain undiagnosed, we hope that future testing may provide answers for even more.
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Affiliation(s)
- Sultana M H Faradz
- Division of Human Genetics, Center for Biomedical Research (CEBIOR), Faculty of Medicine, Universitas Diponegoro/Diponegoro National Hospital, Semarang, Indonesia
- Post Graduate School, Universitas YARSI, Jakarta, Indonesia
| | - Nurin Listyasari
- Division of Human Genetics, Center for Biomedical Research (CEBIOR), Faculty of Medicine, Universitas Diponegoro/Diponegoro National Hospital, Semarang, Indonesia,
| | - Agustini Utari
- Division of Human Genetics, Center for Biomedical Research (CEBIOR), Faculty of Medicine, Universitas Diponegoro/Diponegoro National Hospital, Semarang, Indonesia
- Department of Pediatrics, Diponegoro National Hospital/Dr. Kariadi Hospital, Semarang, Indonesia
| | - Mahayu Dewi Ariani
- Division of Human Genetics, Center for Biomedical Research (CEBIOR), Faculty of Medicine, Universitas Diponegoro/Diponegoro National Hospital, Semarang, Indonesia
| | - Achmad Zulfa Juniarto
- Division of Human Genetics, Center for Biomedical Research (CEBIOR), Faculty of Medicine, Universitas Diponegoro/Diponegoro National Hospital, Semarang, Indonesia
| | - Ardy Santosa
- Department of Urology, Dr. Kariadi Hospital, Semarang, Indonesia
| | | | - Tuula K Rinne
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Dineke Westra
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, The Netherlands
| | | | - Frank H de Jong
- Department of Internal Medicine, Erasmus MC, University Medical Centre Rotterdam, Rotterdam, The Netherlands
| | - Stenvert L S Drop
- Division of Endocrinology, Department of Pediatrics, Sophia Children's Hospital/Erasmus MC, University Medical Centre Rotterdam, Rotterdam, The Netherlands
| | - Katie Ayers
- Murdoch Children's Research Institute, Melbourne, Victoria, Australia
- Department of Pediatrics, The University of Melbourne, Melbourne, Victoria, Australia
| | - Andrew Sinclair
- Murdoch Children's Research Institute, Melbourne, Victoria, Australia
- Department of Pediatrics, The University of Melbourne, Melbourne, Victoria, Australia
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Heidari F, Rahbaran M, Mirzaei A, Mozafari Tabatabaei M, Shokrpoor S, Mahjoubi F, Ara MS, Akbarinejad V, Gharagozloo F. The study of a hermaphroditic sheep caused by a mutation in the promoter of SRY gene. Vet Anim Sci 2023; 21:100308. [PMID: 37593675 PMCID: PMC10428133 DOI: 10.1016/j.vas.2023.100308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/19/2023] Open
Abstract
In mammals, sex-determining region Y (SRY) gene plays vital role as a transcription factor to regulate the expression of the genes contributing to development of male genitals. Any mutation disrupting expression of SRY gene can cause disorders of sex development (DSDs). In this study, the examination of a hermaphroditic (female-like) Shal sheep which was referred for infertility is described. Initially, the reproductive system of the sheep was histologically and anatomically assessed. Karyotyping was used to determine the real gender of the animal. Sex hormones including progesterone, estradiol, and testosterone were measured by enzyme-linked immunosorbent assay (ELISA). Eventually, promoter part and SRY gene were sequenced and aligned to detect any potential mutation using NCBI data base. Although anatomical inspection led to identification of uterus, ovary, and enlarged clitoris as well as testes in the sheep, the karyotyping results interestingly revealed that the animal was genetically a male. Although the sheep had both male and female gonads, there were no overt signs of reproductive behavior and gamete production was not observed. Plasma steroid hormone levels were reported to be at basal levels. Additionally, a mutation was detected on the promoter of the SRY gene. In conclusion, the case implies that mutation on the promoter part of SRY gene could disrupt sexual development of the fetus culminating in DSDs in the sheep.
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Affiliation(s)
- Farid Heidari
- Department of Animal Biotechnology, Faculty of Agriculture Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Tehran, Iran
| | - Mohaddeseh Rahbaran
- Department of Animal Biotechnology, Faculty of Agriculture Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Tehran, Iran
| | - Asieh Mirzaei
- Department of Animal Biotechnology, Faculty of Agriculture Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Tehran, Iran
| | - Mehran Mozafari Tabatabaei
- Department of Animal Biotechnology, Faculty of Agriculture Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Tehran, Iran
- Department of Animal Sciences, Shahid Bahonar University of Kerman, Kerman, Kerman, Iran
| | - Sara Shokrpoor
- Department of Pathology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Tehran, Iran
| | - Frouzandeh Mahjoubi
- Department of Medical Genetic, Institute of Medical Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Tehran, Iran
| | - Mehdi Shams Ara
- Department of Animal Biotechnology, Faculty of Agriculture Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Tehran, Iran
| | - Vahid Akbarinejad
- Department of Theriogenology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Tehran, Iran
| | - Faramarz Gharagozloo
- Department of Theriogenology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Tehran, Iran
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Krivega M, Zimmer J, Slezko A, Frank-Herrmann P, Rehnitz J, Hohenfellner M, Bettendorf M, Luzarowski M, Strowitzki T. Genomic instability in individuals with sex determination defects and germ cell cancer. Cell Death Discov 2023; 9:173. [PMID: 37217472 PMCID: PMC10202957 DOI: 10.1038/s41420-023-01470-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 04/28/2023] [Accepted: 05/12/2023] [Indexed: 05/24/2023] Open
Abstract
The ability to transmit genetic information through generations depends on the preservation of genome integrity. Genetic abnormalities affect cell differentiation, causing tissue specification defects and cancer. We addressed genomic instability in individuals with Differences of Sex Development (DSD), characterized by gonadal dysgenesis, infertility, high susceptibility for different types of cancer, especially Germ Cell Tumors (GCT), and in men with testicular GCTs. Whole proteome analysis of leukocytes, supported by specific gene expression assessment, and dysgenic gonads characterization, uncovered DNA damage phenotypes with altered innate immune response and autophagy. Further examination of DNA damage response revealed a reliance on deltaTP53, which was compromised by mutations in the transactivation domain in DSD-individuals with GCT. Accordingly, drug-induced rescue of DNA damage was achieved by autophagy inhibition but not by stabilization of TP53 in DSD-individuals' blood in vitro. This study elucidates possibilities for prophylactic treatments of DSD-individuals, as well as new diagnostic approaches of GCT.
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Affiliation(s)
- Maria Krivega
- Research Group of Gonadal Differentiation and Embryonic Development, Department of Gynecological Endocrinology & Fertility Disorders, Women Hospital, University of Heidelberg, 69120, Heidelberg, Germany.
| | - Jutta Zimmer
- Research Group of Gonadal Differentiation and Embryonic Development, Department of Gynecological Endocrinology & Fertility Disorders, Women Hospital, University of Heidelberg, 69120, Heidelberg, Germany
| | - Anna Slezko
- Research Group of Gonadal Differentiation and Embryonic Development, Department of Gynecological Endocrinology & Fertility Disorders, Women Hospital, University of Heidelberg, 69120, Heidelberg, Germany
| | - Petra Frank-Herrmann
- Department of Gynecological Endocrinology & Fertility Disorders, Women Hospital, University of Heidelberg, 69120, Heidelberg, Germany
| | - Julia Rehnitz
- Department of Gynecological Endocrinology & Fertility Disorders, Women Hospital, University of Heidelberg, 69120, Heidelberg, Germany
| | - Markus Hohenfellner
- Department of Urology, University Hospital Heidelberg, 69120, Heidelberg, Germany
| | - Markus Bettendorf
- Division of Pediatric Endocrinology, Children's Hospital, University of Heidelberg, 69120, Heidelberg, Germany
| | - Marcin Luzarowski
- Core Facility for Mass Spectrometry & Proteomics, ZMBH, University of Heidelberg, 69120, Heidelberg, Germany
| | - Thomas Strowitzki
- Department of Gynecological Endocrinology & Fertility Disorders, Women Hospital, University of Heidelberg, 69120, Heidelberg, Germany
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Alhamoudi KM, Alghamdi B, Aljomaiah A, Alswailem M, Al-Hindi H, Alzahrani AS. Case Report: Severe Gonadal Dysgenesis Causing 46,XY Disorder of Sex Development Due to a Novel NR5A1 Variant. Front Genet 2022; 13:885589. [PMID: 35865014 PMCID: PMC9294228 DOI: 10.3389/fgene.2022.885589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 06/03/2022] [Indexed: 11/13/2022] Open
Abstract
Mutations in the nuclear receptor subfamily 5 group A member 1 (NR5A1) are the underlying cause of 10–20% of 46,XY disorders of sex development (DSDs). We describe a young girl with 46,XY DSD due to a unique novel mutation of the NR5A1 gene. An 11-year-old subject, raised as a female, was noticed to have clitromegly. She looked otherwise normal. However, her evaluation revealed a 46,XY karyotype, moderate clitromegly but otherwise normal female external genitalia, undescended atrophied testes, rudimentary uterus, no ovaries, and lack of breast development. Serum testosterone and estradiol were low, and gonadotropins were elevated. Adrenocortical function was normal. DNA was isolated from the peripheral leucocytes and used for whole exome sequencing. The results were confirmed by Sanger sequencing. We identified a novel mutation in NR5A1 changing the second nucleotide of the translation initiation codon (ATG>ACG) and resulting in a change of the first amino acid, methionine to threonine (p.Met1The). This led to severe gonadal dysgenesis with deficiency of testosterone and anti-Müllerian hormone (AMH) secretion. Lack of the former led to the development of female external genitalia, and lack of the latter allowed the Müllerian duct to develop into the uterus and the upper vagina. The patient has a female gender identity. Bilateral orchidectomy was performed and showed severely atrophic testes. Estrogen/progesterone therapy was initiated with excellent breast development and normal cyclical menses. In summary, we describe a severely affected case of 46,XY DSD due to a novel NR5A1 mutation involving the initiation codon that fully explains the clinical phenotype in this subject.
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Affiliation(s)
- Kheloud M. Alhamoudi
- Department of Molecular Oncology, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
| | - Balgees Alghamdi
- Department of Molecular Oncology, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
| | - Abeer Aljomaiah
- Department of Medicine, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
| | - Meshael Alswailem
- Department of Molecular Oncology, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
| | - Hindi Al-Hindi
- Department of Pathology and Laboratory Medicine, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
| | - Ali S. Alzahrani
- Department of Molecular Oncology, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
- Department of Medicine, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
- *Correspondence: Ali S. Alzahrani,
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Construction of Copy Number Variation Map Identifies Small Regions of Overlap and Candidate Genes for Atypical Female Genitalia Development. REPRODUCTIVE MEDICINE 2022. [DOI: 10.3390/reprodmed3020014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Copy number variations (CNVs) have been implicated in various conditions of differences of sexual development (DSD). Generally, larger genomic aberrations are more often considered disease-causing or clinically relevant, but over time, smaller CNVs have been associated with various forms of DSD. The main objective of this study is to identify small CNVs and the smallest regions of overlap (SROs) in patients with atypical female genitalia (AFG) and build a CNV map of AFG. We queried the DECIPHER database for recurrent duplications and/or deletions detected across the genome of AFG individuals. From these data, we constructed a chromosome map consisting of SROs and investigated such regions for genes that may be associated with the development of atypical female genitalia. Our study identified 180 unique SROs (7.95 kb to 45.34 Mb) distributed among 22 chromosomes. The most SROs were found in chromosomes X, 17, 11, and 22. None were found in chromosome 3. From these SROs, we identified 22 genes as potential candidates. Although none of these genes are currently associated with AFG, a literature review indicated that almost half were potentially involved in the development and/or function of the reproductive system, and only one gene was associated with a disorder that reported an individual patient with ambiguous genitalia. Our data regarding novel SROs requires further functional investigation to determine the role of the identified candidate genes in the development of atypical female genitalia, and this paper should serve as a catalyst for downstream molecular studies that may eventually affect the genetic counseling, diagnosis, and management of these DSD patients.
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Molecular and Cytogenetic Analysis of Romanian Patients with Differences in Sex Development. Diagnostics (Basel) 2021; 11:diagnostics11112107. [PMID: 34829455 PMCID: PMC8620580 DOI: 10.3390/diagnostics11112107] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 10/18/2021] [Accepted: 10/25/2021] [Indexed: 11/17/2022] Open
Abstract
Differences in sex development (DSD) are often correlated with a genetic etiology. This study aimed to assess the etiology of DSD patients following a protocol of genetic testing. Materials and methods. This study prospectively investigated a total of 267 patients with DSD who presented to Clinical Emergency Hospital for Children Cluj-Napoca between January 2012 and December 2019. Each patient was clinically, biochemically, and morphologically evaluated. As a first intervention, the genetic test included karyotype + SRY testing. A high value of 17-hydroxyprogesterone was found in 39 patients, in whom strip assay analysis of the CYP21A2 gene was subsequently performed. A total of 35 patients were evaluated by chromosomal microarray technique, and 22 patients were evaluated by the NGS of a gene panel. Results. The karyotype analysis established the diagnosis in 15% of the patients, most of whom presented with sex chromosome abnormalities. Genetic testing of CYP21A2 established a confirmation of the diagnosis in 44% of patients tested. SNP array analysis was particularly useful in patients with syndromic DSD; 20% of patients tested presented with pathogenic CNVs or uniparental disomy. Gene panel sequencing established the diagnosis in 11 of the 22 tested patients (50%), and the androgen receptor gene was most often involved in these patients. The genes that presented as pathogenic or likely pathogenic variants or variants of uncertain significance were RSPO1, FGFR1, WT1, CHD7, AR, NIPBL, AMHR2, AR, EMX2, CYP17A1, NR0B1, GNRHR, GATA4, and ATM genes. Conclusion. An evaluation following a genetic testing protocol that included karyotype and SRY gene testing, CYP21A2 analysis, chromosomal analysis by microarray, and high-throughput sequencing were useful in establishing the diagnosis, with a spectrum of diagnostic yield depending on the technique (between 15 and 50%). Additionally, new genetic variants not previously described in DSD were observed.
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Yan YL, Titus T, Desvignes T, BreMiller R, Batzel P, Sydes J, Farnsworth D, Dillon D, Wegner J, Phillips JB, Peirce J, Dowd J, Buck CL, Miller A, Westerfield M, Postlethwait JH. A fish with no sex: gonadal and adrenal functions partition between zebrafish NR5A1 co-orthologs. Genetics 2021; 217:iyaa030. [PMID: 33724412 PMCID: PMC8045690 DOI: 10.1093/genetics/iyaa030] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 11/16/2020] [Indexed: 02/06/2023] Open
Abstract
People with NR5A1 mutations experience testicular dysgenesis, ovotestes, or adrenal insufficiency, but we do not completely understand the origin of this phenotypic diversity. NR5A1 is expressed in gonadal soma precursor cells before expression of the sex-determining gene SRY. Many fish have two co-orthologs of NR5A1 that likely partitioned ancestral gene subfunctions between them. To explore ancestral roles of NR5A1, we knocked out nr5a1a and nr5a1b in zebrafish. Single-cell RNA-seq identified nr5a1a-expressing cells that co-expressed genes for steroid biosynthesis and the chemokine receptor Cxcl12a in 1-day postfertilization (dpf) embryos, as does the mammalian adrenal-gonadal (interrenal-gonadal) primordium. In 2dpf embryos, nr5a1a was expressed stronger in the interrenal-gonadal primordium than in the early hypothalamus but nr5a1b showed the reverse. Adult Leydig cells expressed both ohnologs and granulosa cells expressed nr5a1a stronger than nr5a1b. Mutants for nr5a1a lacked the interrenal, formed incompletely differentiated testes, had no Leydig cells, and grew far larger than normal fish. Mutants for nr5a1b formed a disorganized interrenal and their gonads completely disappeared. All homozygous mutant genotypes lacked secondary sex characteristics, including male breeding tubercles and female sex papillae, and had exceedingly low levels of estradiol, 11-ketotestosterone, and cortisol. RNA-seq showed that at 21dpf, some animals were developing as females and others were not, independent of nr5a1 genotype. By 35dpf, all mutant genotypes greatly under-expressed ovary-biased genes. Because adult nr5a1a mutants form gonads but lack an interrenal and conversely, adult nr5a1b mutants lack a gonad but have an interrenal, the adrenal, and gonadal functions of the ancestral nr5a1 gene partitioned between ohnologs after the teleost genome duplication, likely owing to reciprocal loss of ancestral tissue-specific regulatory elements. Identifying such elements could provide hints to otherwise unexplained cases of Differences in Sex Development.
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Affiliation(s)
- Yi-Lin Yan
- Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA
| | - Tom Titus
- Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA
| | - Thomas Desvignes
- Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA
| | - Ruth BreMiller
- Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA
| | - Peter Batzel
- Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA
| | - Jason Sydes
- Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA
| | - Dylan Farnsworth
- Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA
| | - Danielle Dillon
- Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011, USA
| | - Jeremy Wegner
- Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA
| | | | - Judy Peirce
- Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA
| | - John Dowd
- Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA
| | | | - Charles Loren Buck
- Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011, USA
| | - Adam Miller
- Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA
| | - Monte Westerfield
- Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA
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Abstract
Abstract
Multiplex Ligation-dependent Probe Amplification is a technique proposed for the detection of deletions or duplications that may lead to copy number variations in genomic DNA, mainly due to its higher resolution, and shorter overall diagnosis time, when compared with techniques traditionally used, namely karyotyping, fluorescence in situ hybridization, and array comparative genomic hybridization. Multiplex Ligation-dependent Probe Amplification is a fast (about 2 days), useful and cost-effective technique, being suitable for the diagnosis of hereditary conditions caused by complete or partial gene deletions or duplications, as these conditions are either more difficult or impossible to be diagnosed by other techniques, such as PCR, Real-Time PCR, or sequencing (Sanger or Next Generation). Due to its numerous advantages over conventional cytogenetic analysis techniques, Multiplex Ligation-dependent Probe Amplification could be used in the near future as the main technique for the molecular investigation of genetic conditions caused by copy number variations, in both rare and complex genetic disorders.
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