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Rostampour D, Zolfaghari MR, Gholami M. Novel insertion mutation in the
PLA2G6
gene in an Iranian family with infantile neuroaxonal dystrophy. J Clin Lab Anal 2022; 36:e24253. [PMID: 35092705 PMCID: PMC8906051 DOI: 10.1002/jcla.24253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/01/2022] [Accepted: 01/11/2022] [Indexed: 11/12/2022] Open
Abstract
Background Infantile neuroaxonal dystrophy is an autosomal recessive neurological disorder. Individuals with infantile neuroaxonal dystrophy experience progressive loss of vision, mental skills and muscular control, and other variable clinical signs. Pathogenic variants in the PLA2G6 gene, encoding phospholipase A2, are recognized to be the fundamental reason for infantile neuroaxonal dystrophy. This study aimed to detect pathogenic variant in a consanguine Iranian family with infantile neuroaxonal dystrophy. Methods The mutation screening was done by whole exome sequencing followed by direct Sanger sequencing. Results We identified a homozygous insertion mutation, NM_003560: c.1548_1549insCG (p.G517Rfs*29) in exon 10 of PLA2G6 in the patient. The parents were heterozygous for variant. Conclusions Because of the clinical heterogeneity and rarity of infantile neuroaxonal dystrophy, whole exome sequencing is critical to confirm the diagnosis and is an excellent tool for INAD management.
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Affiliation(s)
- Dorsa Rostampour
- Department of Microbiology Qom Branch Islamic Azad University Qom Iran
| | | | - Milad Gholami
- Department of Biochemistry and Genetics School of Medicine Arak University of Medical Sciences Arak Iran
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Agarwal P, Goswami JN. Siblings with Infantile Neuroaxonal Dystrophy. JOURNAL OF PEDIATRIC NEUROLOGY 2021. [DOI: 10.1055/s-0040-1714093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
AbstractA 2 years 3 months male toddler with motor delay and his female sibling with history of marked global developmental regression following an intercurrent febrile illness were both noted to have phospholipase A2G6 (PLA2G6) mutation, confirming the diagnosis of infantile neuroaxonal dystrophy (INAD). This case report attempts to familiarize readers with the pleomorphic presentation of INAD and the role of early clinical identification, examination, and prompt genetic testing in establishing a diagnosis.
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Affiliation(s)
- Pulkit Agarwal
- Department of Pediatrics, Military Hospital, Ahmedabad, Gujarat, India
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Elsayed LEO, Mohammed IN, Hamed AAA, Elseed MA, Salih MAM, Yahia A, Siddig RA, Amin M, Koko M, Elbashir MI, Ibrahim ME, Brice A, Ahmed AE, Stevanin G. Case report of a novel homozygous splice site mutation in PLA2G6 gene causing infantile neuroaxonal dystrophy in a Sudanese family. BMC MEDICAL GENETICS 2018; 19:72. [PMID: 29739362 PMCID: PMC5941609 DOI: 10.1186/s12881-018-0592-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Accepted: 04/24/2018] [Indexed: 11/10/2022]
Abstract
Background Infantile neuroaxonal dystrophy (INAD) is a rare hereditary neurological disorder caused by mutations in PLA2G6. The disease commonly affects children below 3 years of age and presents with delay in motor skills, optic atrophy and progressive spastic tetraparesis. Studies of INAD in Africa are extremely rare, and genetic studies from Sub Saharan Africa are almost non-existent. Case presentation Two Sudanese siblings presented, at ages 18 and 24 months, with regression in both motor milestones and speech development and hyper-reflexia. Brain MRI showed bilateral and symmetrical T2/FLAIR hyperintense signal changes in periventricular areas and basal ganglia and mild cerebellar atrophy. Whole exome sequencing with confirmatory Sanger sequencing were performed for the two patients and healthy family members. A novel variant (NM_003560.2 c.1427 + 2 T > C) acting on a splice donor site and predicted to lead to skipping of exon 10 was found in PLA2G6. It was found in a homozygous state in the two patients and homozygous reference or heterozygous in five healthy family members. Conclusion This variant has one very strong (loss of function mutation) and three supporting evidences for its pathogenicity (segregation with the disease, multiple computational evidence and specific patients’ phenotype). Therefore this variant can be currently annotated as “pathogenic”. This is the first study to report mutations in PLA2G6 gene in patients from Sudan.
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Affiliation(s)
- Liena E O Elsayed
- Faculty of Medicine, University of Khartoum, Qasr Street, 11111, Khartoum, Sudan.
| | - Inaam N Mohammed
- Faculty of Medicine, University of Khartoum, Qasr Street, 11111, Khartoum, Sudan
| | - Ahlam A A Hamed
- Faculty of Medicine, University of Khartoum, Qasr Street, 11111, Khartoum, Sudan
| | - Maha A Elseed
- Faculty of Medicine, University of Khartoum, Qasr Street, 11111, Khartoum, Sudan
| | - Mustafa A M Salih
- Division of Pediatric Neurology, Department of Pediatrics, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Ashraf Yahia
- Faculty of Medicine, University of Khartoum, Qasr Street, 11111, Khartoum, Sudan.,Department of Biochemistry, Faculty of Medicine, National University, Khartoum, Sudan
| | - Rayan A Siddig
- Faculty of Medicine, University of Khartoum, Qasr Street, 11111, Khartoum, Sudan
| | - Mutaz Amin
- Faculty of Medicine, University of Khartoum, Qasr Street, 11111, Khartoum, Sudan
| | - Mahmoud Koko
- Department of Molecular Biology, Institute of Endemic Diseases, University of Khartoum, Khartoum, Sudan.,Department of Neurology and Epileptology, Hertie Institute for Clinical Brain Research, Tuebingen, Germany
| | - Mustafa I Elbashir
- Faculty of Medicine, University of Khartoum, Qasr Street, 11111, Khartoum, Sudan
| | - Muntaser E Ibrahim
- Department of Molecular Biology, Institute of Endemic Diseases, University of Khartoum, Khartoum, Sudan
| | - Alexis Brice
- Institut du Cerveau et de la Moelle épinière, INSERM U1127, CNRS UMR7225, Sorbonne Universités, UPMC Université Paris VI UMR_S1127, 75013, Paris, France.,Department of genetics, APHP Pitié-Salpêtrière Hospital, 75013, Paris, France
| | - Ammar E Ahmed
- Faculty of Medicine, University of Khartoum, Qasr Street, 11111, Khartoum, Sudan.
| | - Giovanni Stevanin
- Institut du Cerveau et de la Moelle épinière, INSERM U1127, CNRS UMR7225, Sorbonne Universités, UPMC Université Paris VI UMR_S1127, 75013, Paris, France.,Ecole Pratique des Hautes Etudes, EPHE, PSL research university, 75014, Paris, France.,Department of genetics, APHP Pitié-Salpêtrière Hospital, 75013, Paris, France
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