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Siri B, Olivieri G, Angeloni A, Cairoli S, Carducci C, Cotugno G, Di Michele S, Giovanniello T, La Marca G, Lepri FR, Novelli A, Rossi C, Semeraro M, Dionisi-Vici C. The diagnostic challenge of mild citrulline elevation at newborn screening. Mol Genet Metab 2022; 135:327-332. [PMID: 35279366 DOI: 10.1016/j.ymgme.2022.02.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 02/16/2022] [Accepted: 02/17/2022] [Indexed: 12/17/2022]
Abstract
Citrulline is a target analyte measured at expanded newborn screening (NBS) and its elevation represents a biomarker for distal urea cycle disorders and citrin deficiency. Altered ratios of citrulline with other urea cycle-related amino acids are helpful for the differential diagnosis. However, the use of cut-off values in screening programmes has raised the issue about the interpretation of mild elevation of citrulline levels detected at NBS, below the usual range observed in the "classical/severe" forms of distal urea cycle disorders and in citrin deficiency. Herein, we report ten subjects with positive NBS for a mild elevation of citrulline (<100 μmol/L), in whom molecular investigations revealed carriers status for argininosuccinate synthase deficiency, a milder form of argininosuccinate lyase deficiency and two other diseases, lysinuric protein intolerance and dihydrolipoamide dehydrogenase deficiency, not primarily affecting the urea cycle. To guide the diagnostic process, we have designed an algorithm for mild citrulline elevation (<100 μmol/L) at NBS, which expands the list of disorders to be included in the differential diagnosis.
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Affiliation(s)
- Barbara Siri
- Division of Metabolism, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy; Department of Paediatrics, Città della Salute e della Scienza, OIRM, Univerisity of Turin, Italy.
| | - Giorgia Olivieri
- Division of Metabolism, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Antonio Angeloni
- Department of Experimental Medicine, Sapienza University of Rome and Newborn Screening Center, Clinical Pathology Unit, University Hospital Policlinico Umberto I, Rome, Italy
| | - Sara Cairoli
- Division of Metabolism and Metabolic Diseases Research Unit, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Claudia Carducci
- Department of Experimental Medicine, Sapienza University of Rome and Newborn Screening Center, Clinical Pathology Unit, University Hospital Policlinico Umberto I, Rome, Italy
| | - Giovanna Cotugno
- Division of Metabolism, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | | | - Teresa Giovanniello
- Department of Experimental Medicine, Sapienza University of Rome and Newborn Screening Center, Clinical Pathology Unit, University Hospital Policlinico Umberto I, Rome, Italy
| | - Giancarlo La Marca
- Department of Experimental and Clinical Biomedical Sciences, University of Florence and Newborn Screening, Clinical Chemistry and Pharmacology Lab, Meyer Children's University Hospital, Florence, Italy
| | - Francesca Romana Lepri
- Translational Cytogenomics Research Unit, Laboratory of Medical Genetics, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Antonio Novelli
- Translational Cytogenomics Research Unit, Laboratory of Medical Genetics, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Claudia Rossi
- Center for Advanced Studies and Technology (CAST), Department of Psychological, Health and Territorial Sciences, "G. d'Annunzio", University of Chieti-Pescara, Chieti, Italy
| | - Michela Semeraro
- Division of Metabolism and Metabolic Diseases Research Unit, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Carlo Dionisi-Vici
- Division of Metabolism, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
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