Abstract
Background:
Norrie disease (ND) is a rare X-linked disorder characterized by bilateral congenital blindness. ND is caused by a mutation in the Norrie disease pseudoglioma (NDP) gene, which encodes a 133-amino acid protein called norrin. Intragenic deletions including NDP and adjacent genes have been identified in ND patients with a more severe neurologic phenotype. We report the biochemical, molecular, clinical and radiological features of two unrelated affected males with a deletion including NDP and MAO genes.
Methods:
Biochemical and genetic analyses were performed to understand the atypical phenotype and radiological findings. Biogenic amines in cerebrospinal fluid (CSF) were measured by high-performance liquid chromatography. The coding exons of NDP gene were amplified by polymerase chain reaction. Multiplex ligation-dependent probe amplification and chromosomal microarray were carried out on both affected males. Computed tomography and magnetic resonance imaging were performed on the two patients.
Results:
In one patient, the serotonin and catecholamine metabolite levels in CSF were virtually undetectable. In both patients, genetic studies revealed microdeletions in the Xp11.3 region, involving the NDP, MAOA and MAOB genes. Radiological examination demonstrated brain and cerebellar atrophy.
Conclusions:
We suggest that alterations caused by MAO deficit may remain during the first years of life. Clinical phenotype, biochemical findings and neuroimaging can guide the genetic study in patients with atypical ND and help us to a better understanding of this disease.
Acknowledgments
We are thankful to our colleague Enrique Rodríguez Borja for his thoughtful comments on the manuscript.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: Instituto de Investigación Sanitaria La Fe, Post-resident Research Program.
Employment or leadership: None declared.
Honorarium: None declared.
Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.
References
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©2018 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Editorial
- Need for better PTH assays for clinical research and patient treatment
- Reviews
- Liquid biopsy in ovarian cancer: recent advances on circulating tumor cells and circulating tumor DNA
- Hair testing of GHB: an everlasting issue in forensic toxicology
- Opinion Paper
- The use of error and uncertainty methods in the medical laboratory
- Genetics and Molecular Diagnostics
- Results of the first external quality assessment scheme (EQA) for isolation and analysis of circulating tumour DNA (ctDNA)
- The importance of biochemical and genetic findings in the diagnosis of atypical Norrie disease
- General Clinical Chemistry and Laboratory Medicine
- Various glycolysis inhibitor-containing tubes for glucose measurement cannot be used interchangeably due to clinically unacceptable biases between them
- Measurement uncertainty of γ-glutamyltransferase (GGT) in human serum by four approaches using different quality assessment data
- Oxidation of PTH: in vivo feature or effect of preanalytical conditions?
- A comparison between high resolution serum protein electrophoresis and screening immunofixation for the detection of monoclonal gammopathies in serum
- The key incident monitoring and management system – history and role in quality improvement
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- Contamination of dried blood spots – an underestimated risk in newborn screening
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- Use of the sFlt-1/PlGF ratio to rule out preeclampsia requiring delivery in women with suspected disease. Is the evidence reproducible?
- Evaluation of a new free light chain ELISA assay: bringing coherence with electrophoretic methods
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- The frequency of occurrence of fish-shaped red blood cells in different haematologic disorders
- Reference Values and Biological Variations
- Pediatric reference intervals for 29 Ortho VITROS 5600 immunoassays using the CALIPER cohort of healthy children and adolescents
- Cancer Diagnostics
- Prevalence and causes of abnormal PSA recovery
- Cardiovascular Diseases
- Serum omentin-1 is a novel biomarker for predicting the functional outcome of acute ischemic stroke patients
- Letters to the Editor
- BD Vacutainer® Barricor tube in the emergency department: reduced hemolysis rates using partial draw tubes with reduced vacuum
- The risk of unjustified BRCA testing after the “Angelina Jolie effect”: how can we save (laboratory) medicine from the Internet?
- Sweat travels: the issue of sweat chloride transportation
- Individual values of antineutrophil cytoplasmic antibodies do not correspond between antigen-specific assays
- False negative results caused by erroneous automated result interpretation algorithm on the FilmArray 2.0 instrument
- Quantification of 1,25-dihydroxyvitamin D – value of manufacturers’ product information
- Interference between ethosuximide and barbiturates in an immunochromatographic method
- In vivo interference of Ioversol in serum and urine capillary electrophoresis: an optimized protocol for sample collection
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- Congress Abstracts
- 9th National Congress of the Portuguese Society of Clinical Chemistry, Genetics and Laboratory Medicine
- ACBI 2017 40TH Annual Conference
Articles in the same Issue
- Frontmatter
- Editorial
- Need for better PTH assays for clinical research and patient treatment
- Reviews
- Liquid biopsy in ovarian cancer: recent advances on circulating tumor cells and circulating tumor DNA
- Hair testing of GHB: an everlasting issue in forensic toxicology
- Opinion Paper
- The use of error and uncertainty methods in the medical laboratory
- Genetics and Molecular Diagnostics
- Results of the first external quality assessment scheme (EQA) for isolation and analysis of circulating tumour DNA (ctDNA)
- The importance of biochemical and genetic findings in the diagnosis of atypical Norrie disease
- General Clinical Chemistry and Laboratory Medicine
- Various glycolysis inhibitor-containing tubes for glucose measurement cannot be used interchangeably due to clinically unacceptable biases between them
- Measurement uncertainty of γ-glutamyltransferase (GGT) in human serum by four approaches using different quality assessment data
- Oxidation of PTH: in vivo feature or effect of preanalytical conditions?
- A comparison between high resolution serum protein electrophoresis and screening immunofixation for the detection of monoclonal gammopathies in serum
- The key incident monitoring and management system – history and role in quality improvement
- Is it necessary for all samples to quantify 25OHD2 and 25OHD3 using LC-MS/MS in clinical practice?
- Contamination of dried blood spots – an underestimated risk in newborn screening
- Comparative study of the diagnostic and prognostic value of antibodies against chimeric citrullinated synthetic peptides and CCP3/CCP3.1 assays
- Development and validation of a multivariable prediction rule for detecting a severe acquired ADAMTS13 activity deficiency in patients with thrombotic microangiopathies
- Use of the sFlt-1/PlGF ratio to rule out preeclampsia requiring delivery in women with suspected disease. Is the evidence reproducible?
- Evaluation of a new free light chain ELISA assay: bringing coherence with electrophoretic methods
- Hematology and Coagulation
- The frequency of occurrence of fish-shaped red blood cells in different haematologic disorders
- Reference Values and Biological Variations
- Pediatric reference intervals for 29 Ortho VITROS 5600 immunoassays using the CALIPER cohort of healthy children and adolescents
- Cancer Diagnostics
- Prevalence and causes of abnormal PSA recovery
- Cardiovascular Diseases
- Serum omentin-1 is a novel biomarker for predicting the functional outcome of acute ischemic stroke patients
- Letters to the Editor
- BD Vacutainer® Barricor tube in the emergency department: reduced hemolysis rates using partial draw tubes with reduced vacuum
- The risk of unjustified BRCA testing after the “Angelina Jolie effect”: how can we save (laboratory) medicine from the Internet?
- Sweat travels: the issue of sweat chloride transportation
- Individual values of antineutrophil cytoplasmic antibodies do not correspond between antigen-specific assays
- False negative results caused by erroneous automated result interpretation algorithm on the FilmArray 2.0 instrument
- Quantification of 1,25-dihydroxyvitamin D – value of manufacturers’ product information
- Interference between ethosuximide and barbiturates in an immunochromatographic method
- In vivo interference of Ioversol in serum and urine capillary electrophoresis: an optimized protocol for sample collection
- Evaluation of the new Elecsys SCC assay: comparison with the Kryptor SCC assay
- Congress Abstracts
- 9th National Congress of the Portuguese Society of Clinical Chemistry, Genetics and Laboratory Medicine
- ACBI 2017 40TH Annual Conference