E-ISSN 1658-8088 | ISSN 1658-807X
 

Case Report
Online Published: 25 Nov 2019
 


Metabolic biomarker testing facilitates genetic diagnosis of Niemann-Pick disease by enabling classification of novel SMPD1 variants

Vindhya Lakmali Miyanawala, Christian Beetz, Samantha Waidyanatha, Sabine Schroder, Vasiliki Karageorgou, Claudia Cozma, Eresha Jasinge, Arndt Rolfs.


Abstract
Background: Niemann–Pick (NP) disease is a genetically heterogeneous metabolic disorder caused by bi-allelic variants in NPC1, NPC2, or SMPD1, with initial symptoms and age at onset varying widely. The interpretation of variants in NP disease genes is challenging when these alterations have never been observed before, and when parental samples are not available. Case Presentation: We clinically, genetically, and biochemically characterized an infant with a complex presentation and a negative family history. Clinical and paraclinical observations were consistent with NP disease. Genetic screening identified two previously unreported SMPD1 missense variants, which were initially classified as variants of unknown significance. Based on strongly increased plasma levels of lysosphingomyelin-509, both variants could be re-classified as likely pathogenic, thus establishing a diagnosis of NP disease type A/B. Conclusion: A combination of genetics with biochemical approaches facilitates conclusive diagnosis of metabolic disorders including NP disease. Blood-based biomarkers are particularly promising in this respect.

Key words: Biomarker, enzymatic testing, Niemann–Pick disease, SMPD1, variant classification.


 
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How to Cite this Article
Pubmed Style

Miyanawala VL, Beetz C, Waidyanatha S, Schroder S, Karageorgou V, Cozma C, Jasinge E, Rolfs A. Metabolic biomarker testing facilitates genetic diagnosis of Niemann-Pick disease by enabling classification of novel SMPD1 variants. JBCGenetics. 2019; 2(2): 147-150. doi:10.24911/JBCGenetics/183-1562077620


Web Style

Miyanawala VL, Beetz C, Waidyanatha S, Schroder S, Karageorgou V, Cozma C, Jasinge E, Rolfs A. Metabolic biomarker testing facilitates genetic diagnosis of Niemann-Pick disease by enabling classification of novel SMPD1 variants. https://www.jbcgenetics.com/?mno=55059 [Access: November 14, 2024]. doi:10.24911/JBCGenetics/183-1562077620


AMA (American Medical Association) Style

Miyanawala VL, Beetz C, Waidyanatha S, Schroder S, Karageorgou V, Cozma C, Jasinge E, Rolfs A. Metabolic biomarker testing facilitates genetic diagnosis of Niemann-Pick disease by enabling classification of novel SMPD1 variants. JBCGenetics. 2019; 2(2): 147-150. doi:10.24911/JBCGenetics/183-1562077620



Vancouver/ICMJE Style

Miyanawala VL, Beetz C, Waidyanatha S, Schroder S, Karageorgou V, Cozma C, Jasinge E, Rolfs A. Metabolic biomarker testing facilitates genetic diagnosis of Niemann-Pick disease by enabling classification of novel SMPD1 variants. JBCGenetics. (2019), [cited November 14, 2024]; 2(2): 147-150. doi:10.24911/JBCGenetics/183-1562077620



Harvard Style

Miyanawala, V. L., Beetz, . C., Waidyanatha, . S., Schroder, . S., Karageorgou, . V., Cozma, . C., Jasinge, . E. & Rolfs, . A. (2019) Metabolic biomarker testing facilitates genetic diagnosis of Niemann-Pick disease by enabling classification of novel SMPD1 variants. JBCGenetics, 2 (2), 147-150. doi:10.24911/JBCGenetics/183-1562077620



Turabian Style

Miyanawala, Vindhya Lakmali, Christian Beetz, Samantha Waidyanatha, Sabine Schroder, Vasiliki Karageorgou, Claudia Cozma, Eresha Jasinge, and Arndt Rolfs. 2019. Metabolic biomarker testing facilitates genetic diagnosis of Niemann-Pick disease by enabling classification of novel SMPD1 variants. Journal of Biochemical and Clinical Genetics, 2 (2), 147-150. doi:10.24911/JBCGenetics/183-1562077620



Chicago Style

Miyanawala, Vindhya Lakmali, Christian Beetz, Samantha Waidyanatha, Sabine Schroder, Vasiliki Karageorgou, Claudia Cozma, Eresha Jasinge, and Arndt Rolfs. "Metabolic biomarker testing facilitates genetic diagnosis of Niemann-Pick disease by enabling classification of novel SMPD1 variants." Journal of Biochemical and Clinical Genetics 2 (2019), 147-150. doi:10.24911/JBCGenetics/183-1562077620



MLA (The Modern Language Association) Style

Miyanawala, Vindhya Lakmali, Christian Beetz, Samantha Waidyanatha, Sabine Schroder, Vasiliki Karageorgou, Claudia Cozma, Eresha Jasinge, and Arndt Rolfs. "Metabolic biomarker testing facilitates genetic diagnosis of Niemann-Pick disease by enabling classification of novel SMPD1 variants." Journal of Biochemical and Clinical Genetics 2.2 (2019), 147-150. Print. doi:10.24911/JBCGenetics/183-1562077620



APA (American Psychological Association) Style

Miyanawala, V. L., Beetz, . C., Waidyanatha, . S., Schroder, . S., Karageorgou, . V., Cozma, . C., Jasinge, . E. & Rolfs, . A. (2019) Metabolic biomarker testing facilitates genetic diagnosis of Niemann-Pick disease by enabling classification of novel SMPD1 variants. Journal of Biochemical and Clinical Genetics, 2 (2), 147-150. doi:10.24911/JBCGenetics/183-1562077620





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