1
|
Majethia P, Do Rosario MC, Kaur P, Karanvir, Shankar R, Sharma S, Siddiqui S, Shukla A. Further evidence of muscle involvement in neurodevelopmental disorder with epilepsy, spasticity, and brain atrophy. Ann Hum Genet 2022; 86:94-101. [PMID: 34878169 PMCID: PMC9990823 DOI: 10.1111/ahg.12452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 11/16/2021] [Accepted: 11/17/2021] [Indexed: 11/30/2022]
Abstract
TRAPPC4-related neurodevelopmental disorder with epilepsy, spasticity, and brain atrophy (MIM# 618741) is a recently described TRAPPopathy with clinical findings of developmental delay, seizures, postnatal microcephaly, spasticity, facial dysmorphism, and cerebral and cerebellar atrophy. Muscle involvement, a frequent finding in TRAPPopathies, was observed in one individual with TRAPPC4-related disorder previously. Only a single variant, an in-frame deletion in one family has been reported outside a recurrent disease-causing variant. We report three individuals from two Indian families harboring novel bi-allelic missense variants c.191T>C and c.278C>T (NM_016146.6) in TRAPPC4 with classic clinical presentation in one and milder and later onset in the other family. We provide further evidence for muscle involvement and review the detailed phenotypic findings in individuals reported with this disorder till date.
Collapse
Affiliation(s)
- Purvi Majethia
- Department of Medical Genetics, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Michelle C Do Rosario
- Department of Medical Genetics, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Parneet Kaur
- Department of Medical Genetics, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Karanvir
- Neurology Division, Department of Pediatrics, Lady Hardinge Medical College and Associated Kalawati Saran Children's Hospital, New Delhi, India
| | - Raagul Shankar
- Neurology Division, Department of Pediatrics, Lady Hardinge Medical College and Associated Kalawati Saran Children's Hospital, New Delhi, India
| | - Suvasini Sharma
- Neurology Division, Department of Pediatrics, Lady Hardinge Medical College and Associated Kalawati Saran Children's Hospital, New Delhi, India
| | - Shahyan Siddiqui
- Department of Neuroimaging and Interventional Radiology, STAR Institute of Neurosciences, STAR Hospitals, Hyderabad, Telangana, India
| | - Anju Shukla
- Department of Medical Genetics, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, Karnataka, India
| |
Collapse
|
2
|
Abstract
Epilepsy, progressive myoclonic 3, with or without intracellular inclusions (MIM# 611726) is a rare autosomal recessive condition associated with pathogenic variants in KCTD7, which encodes the BR-C,ttk and bab/pox virus and zinc finger domain-containing KCTD7 protein. We report four individuals from three Indian families presenting with an initial period of normal development, progressive myoclonic seizures followed by neuroregression and an abnormal electroencephalogram. We identified two novel missense variants, c.458G>C p.(Arg153Pro) and c.205C>G p.(Leu69Val) and one known disease-causing variant, c.280C>T p.(Arg94Trp) in KCTD7 by exome sequencing. We review the literature of 67 individuals with variants in KCTD7. Our study expands the molecular spectrum of KCTD7-related progressive myoclonic epilepsy.
Collapse
Affiliation(s)
- Dhanya Lakshmi Narayanan
- Department of Medical Genetics, Kasturba Medical College, Manipal Academy of Higher Education, Manipal, India
| | | | | | | |
Collapse
|
3
|
Majethia P, Girisha KM. Wiedemann-Rautenstrauch syndrome in an Indian patient with biallelic pathogenic variants in POLR3A. Am J Med Genet A 2021; 185:1602-1605. [PMID: 33559318 DOI: 10.1002/ajmg.a.62115] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 01/02/2021] [Accepted: 01/12/2021] [Indexed: 11/11/2022]
Abstract
Wiedemann-Rautenstrauch syndrome (WRS; MIM# 264090) is a rare neonatal progeroid disorder resulting from biallelic pathogenic variants in the POLR3A. It is an autosomal recessive condition characterized by growth retardation, lipoatrophy, a distinctive face, sparse scalp hair, and dental anomalies. Till date, 19 families are reported with WRS due to variants in POLR3A. Here, we describe an 18 months old male child with biallelic c.2005C>T p.(Arg669Ter) and c.1771-7C>G variant in heterozygous state identified by exome sequencing in POLR3A leading to WRS phenotype. The variant c.1771-7C>G was earlier found to be associated with hereditary spastic ataxia. We emphasize on the phenotype in an Indian patient with WRS.
Collapse
Affiliation(s)
- Purvi Majethia
- Department of Medical Genetics, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, India
| | - Katta Mohan Girisha
- Department of Medical Genetics, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, India
| |
Collapse
|
4
|
Sharawat IK, Dawman L, Panda PK. Toddler With Frequent Falls and Neuroregression: Imaging Clues! J Pediatr Neurosci 2021; 15:332-333. [PMID: 33531963 PMCID: PMC7847112 DOI: 10.4103/jpn.jpn_6_20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Accepted: 03/19/2020] [Indexed: 11/12/2022] Open
Abstract
Late infantile metachromatic leukodystrophy is an autosomal recessive disorder caused by a deficiency in the enzyme activity of Aryl sulfatase-A. The classical presentation is characterized by gait disturbance, frequent fall, toe walking, impaired swallowing and feeding, seizures, progressive neuroregression, decorticate posture and early death. Here we report a toddler who presented with frequent falls and cognitive regression. Magnetic resonance imaging (MRI) showed a striking leopard skin pattern. Recognition of this pattern on MRI in proper clinical context can serve as a clue to the diagnosis.
Collapse
Affiliation(s)
- Indar K Sharawat
- Pediatric Neurology Division, Department of Pediatrics, All India Institute of Medical Sciences, Rishikesh, Uttarakhand, India
| | - Lesa Dawman
- Department of Pediatrics, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Prateek K Panda
- Pediatric Neurology Division, Department of Pediatrics, All India Institute of Medical Sciences, Rishikesh, Uttarakhand, India
| |
Collapse
|
5
|
Gowda VK, Vegda H, Sugumar K, Narayanappa G, Srinivasan VM, Santhoshkumar R, Bhat M, Balu S, Naveen MR. Neuronal Ceroid Lipofuscinosis: Clinical and Laboratory Profile in Children from Tertiary Care Centre in South India. J Pediatr Genet 2020; 10:266-273. [PMID: 34849271 DOI: 10.1055/s-0040-1715575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 07/08/2020] [Indexed: 10/23/2022]
Abstract
Neuronal ceroid Lipofuscinosis (NCL), inherited disorders of lysosomal storage disorders, constitute the most common progressive encephalopathies with an incidence of 1.3 to 7 in 100,000 live births. We reported clinical, electrophysiological, radiological, ultrastructural, and molecular genetic features of NCL. This is a retrospective review, in a tertiary care center from January 2016 to December 2019. All children with clinical features of NCL and confirmed by pathogenic mutation and/or enzyme assay were included. A total of 60 children (male:female = 3:1) were studied. The commonest type was CLN 2 (41.7%). Neuroregression, seizures, and ataxia were present in all cases. Retinal arterial attenuation was seen in 38.33% cases. Magnetic resonance imaging (MRI) brain was abnormal in all patients, thalamic and caudate nucleus atrophy common in CLN1 (62%). Electroencephalography was abnormal in all children, but photoparoxysmal response at low intermittent photic stimulation frequencies was seen in four children of CLN2. Electron microscopy done in 43 children revealed abnormal inclusions in 20 (46.52%) children. Enzyme study showed low levels in 36 (78%) out of 46 cases. Of these, 21 had low tripeptidyl peptidase and 15 had low palmitoyl protein thioesterase levels. Molecular testing done in 26 cases showed pathogenic variant in 23 (88%) cases. Infantile onset with thalamic atrophy on MRI is common in CLN1 and refractory epilepsy, visual impairment and specific EEG changes are common in CLN2. These features are helpful in selecting enzyme assay for CLN1 versus CLN2. Electron microscopy helped in the diagnosis and genetic testing in subtyping. Thus, a multimode approach played a role in the diagnosis of NCL.
Collapse
Affiliation(s)
- Vykuntaraju K Gowda
- Department of Pediatric Neurology, Indira Gandhi Institute of Child Health, Bangalore, India
| | - Hemadri Vegda
- Department of Pediatric Neurology, Indira Gandhi Institute of Child Health, Bangalore, India
| | - Kiruthiga Sugumar
- Department of Pediatric Neurology, Indira Gandhi Institute of Child Health, Bangalore, India
| | - Gayathri Narayanappa
- Department of Neuropathology, National Institute of Mental Health and Neurosciences, Bangalore, India
| | | | - Rashmi Santhoshkumar
- Electron Microscope Laboratory, National Institute of Mental Health and Neurosciences, Bangalore, India
| | - Maya Bhat
- Department of Neuroradiology, National institute of Mental Health and Neurosciences, Bangalore, India
| | - Sam Balu
- Molecular Genetics Department, Eurofins Clinical Genetics, Bangalore, India
| | - Mohan Rao Naveen
- Molecular Genetics Department, Eurofins Clinical Genetics, Bangalore, India
| |
Collapse
|
6
|
Baskaran D, Hussain N. Facial Dysmorphism, Hirsutism, and Failure to Thrive as Manifestation of Leigh Syndrome in a Child with SURF1 Mutation. J Pediatr Neurosci 2020; 15:108-110. [PMID: 33042241 PMCID: PMC7519751 DOI: 10.4103/jpn.jpn_137_18] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Revised: 11/18/2019] [Accepted: 03/30/2020] [Indexed: 11/04/2022] Open
Abstract
Leigh syndrome (or subacute necrotizing encephalomyelopathy) is a rare neurodegenerative disorder characterized by psychomotor retardation or regression, typically occurring in stepwise decrements. Onset is typically between ages 3 and 12 months. Neurological manifestations include hypotonia, spasticity, movement disorders (including chorea), cerebellar ataxia, and peripheral neuropathy, whereas extraneurological manifestations may include hypertrophic cardiomyopathy, hypertrichosis, anemia, renal tubulopathy, liver involvement, ptosis, and muscle weakness. Approximately 50% of affected individuals die by age 3 years, most often as a result of respiratory or cardiac failure. We report a case of 22-month-old female child presenting to us with severe failure to thrive, dysmorphic features, hirsutism, external ophthalmoplegia epilepsy, and neuroregression with characteristic findings of Leigh's syndrome on neuroimaging and her muscle biopsy revealed evidence of mitochondrial respiratory chain defect involving complex IV and SURF1 mutation.
Collapse
Affiliation(s)
- Dhinesh Baskaran
- Department of Paediatric Neurology, Leicester Royal Infirmary, Leicester, UK
| | - Nahin Hussain
- Department of Paediatric Neurology, Leicester Royal Infirmary, Leicester, UK
| |
Collapse
|
7
|
Prithvi A, Sharawat IK, Saini AG, Singh P. Epilepsy and Neurodegeneration: Clues in the Hair and Blood Vessels! J Pediatr 2019; 206:293-293.e2. [PMID: 30529134 DOI: 10.1016/j.jpeds.2018.09.069] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 09/24/2018] [Accepted: 09/26/2018] [Indexed: 10/28/2022]
Affiliation(s)
| | | | | | - Paramjeet Singh
- Department of Radio Diagnosis and Imaging Postgraduate Institute of Medical Education and Research Chandigarh, India
| |
Collapse
|
8
|
Sharawat IK, Suthar R, Ahuja CK, Sankhyan N. Extensive Bluish-Black Spots. J Pediatr 2018; 198:321-321.e1. [PMID: 29681451 DOI: 10.1016/j.jpeds.2018.02.067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 02/27/2018] [Indexed: 10/17/2022]
Affiliation(s)
| | - Renu Suthar
- Pediatric Neurology and Neurodevelopment Unit Department of Pediatrics
| | | | - Naveen Sankhyan
- Pediatric Neurology and Neurodevelopment Unit Department of Pediatrics Postgraduate Institute of Medical Education and Research Chandigarh, India
| |
Collapse
|
9
|
Yoganathan S, Varman M, Oommen SP, Thomas M. A Tale of Treatable Infantile Neuroregression and Diagnostic Dilemma with Glutaric Aciduria Type I. J Pediatr Neurosci 2018; 12:356-359. [PMID: 29675077 PMCID: PMC5890558 DOI: 10.4103/jpn.jpn_35_17] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Nutritional deficiencies related neurological manifestations are not uncommon in infants and children. Here, we describe an infant with Vitamin B12 deficiency due to depleted maternal Vitamin B12 status presenting with progressive encephalopathy and extrapyramidal signs. Diagnosis of infantile tremor syndrome was established in our patient based on the clinical and biochemical parameters. Magnetic resonance imaging had shown frontotemporal atrophy with widened Sylvian fissures and prominent cerebrospinal fluid spaces. Clinical and imaging findings might create a diagnostic dilemma with glutaric aciduria type I. Knowledge and identification of infantile tremor syndrome are essential, as it is a potentially treatable disorder. Our patient had significant developmental gains with Vitamin B12 treatment and infant stimulation program. Vitamin B12 deficiency must be looked for as a cause of neuroregression in children hailing from low socioeconomic status, infants of vegetarian mother, and infants with delayed or improper weaning. Screening for Vitamin B12 deficiency is essential in all infants and children with unexplained neuroregression, as this disorder is potentially treatable. More population-based studies in India are needed to explore the prevalence of Vitamin B12 deficiency in pregnant and lactating women and also to assess the need for Vitamin B12 supplementation during pregnancy and lactation.
Collapse
Affiliation(s)
- Sangeetha Yoganathan
- Department of Neurological Sciences, Christian Medical College, Vellore, Tamil Nadu, India
| | - Mugil Varman
- Department of Radiodiagnosis, Christian Medical College, Vellore, Tamil Nadu, India
| | - Samuel Philip Oommen
- Department of Developmental Pediatrics, Christian Medical College, Vellore, Tamil Nadu, India
| | - Maya Thomas
- Department of Neurological Sciences, Christian Medical College, Vellore, Tamil Nadu, India
| |
Collapse
|
10
|
Abstract
Glutaric aciduria type 1 (GA-1) is an autosomal-recessive disorder caused by the deficiency of the mitochondrial enzyme glutaryl-CoA dehydrogenase. A 13-month-old boy presented with microcephaly, developmental delay, and progressive spasticity and was being treated as spastic cerebral palsy, later on had loss of developmental milestones after acute episode of illness at 12 months of age. The magnetic resonance imaging of brain revealed widened Sylvian fissure, hyperintensities in bilateral globus pallidus, and bilateral frontoparietal atrophy along with white matter loss. The urine examination by gas chromatography–mass spectroscopy revealed a marked excretion of glutaric acid and 3-hydroxyglutaric acid. The diagnosis of GA-1 was confirmed on the basis of characteristic neuroimaging, biochemical, and mutation studies. There are rare reports in the literature about association of GA-1 with microcephaly. The child was started on trihexyphenidyl, l
-carnitine, and high-dose riboflavin, and dietary therapy in the form of low-protein diet was advised.
Collapse
Affiliation(s)
- Indar K Sharawat
- Department of Paediatrics, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Lesa Dawman
- Department of Paediatrics, All India Institute of Medical Sciences, New Delhi, India
| |
Collapse
|
11
|
Smith J, Williams MT, Misra VK. Psychiatric disease in an adolescent as a harbinger of cerebral X-linked adrenoleukodystrophy. Pract Neurol 2017; 18:242-245. [PMID: 29175874 DOI: 10.1136/practneurol-2017-001718] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/07/2017] [Indexed: 11/04/2022]
Abstract
X-linked adrenoleukodystrophy (XALD) typically presents as a childhood cerebral demyelinating form, as an adult-onset adrenomyeloneuropathy or as adrenocortical insufficiency. Cerebral demyelination presenting in adolescence is unusual. We present an 17-year-old boy with adolescent-onset XALD initially manifesting with slowly progressive psychiatric symptoms. He was initially diagnosed with attention-deficit hyperactivity disorder and an acute psychosis. However, he was ultimately diagnosed with XALD based on his clinical course, neuroimaging findings and biochemical abnormalities. This case reiterates the atypical presentations of adolescent-onset cerebral XALD that may go unrecognised and misdiagnosed as a neurodevelopmental or psychiatric disease. Treatments for cerebral ALD are potentially life-saving, particularly when given early in the disease course.
Collapse
Affiliation(s)
- Jessica Smith
- Departments of Obstetrics and Gynecology and Pediatrics, Division of Genetic, Genomic and Metabolic Disorders, Wayne State University School of Medicine, Detroit, Michigan, USA
| | - Mitchel T Williams
- Department of Pediatrics, Division of Pediatric Neurology, Wayne State University School of Medicine, Detroit, Michigan, USA
| | - Vinod K Misra
- Department of Pediatrics, Division of Genetic, Genomic and Metabolic Disorders, Wayne State University School of Medicine, Detroit, Michigan, USA
| |
Collapse
|
12
|
Saini AG, Sankhyan N, Singhi P. Chorea in Late-Infantile Neuronal Ceroid Lipofuscinosis: An Atypical Presentation. Pediatr Neurol 2016; 60:75-8. [PMID: 27343025 DOI: 10.1016/j.pediatrneurol.2016.02.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/26/2015] [Revised: 02/21/2016] [Accepted: 02/26/2016] [Indexed: 10/22/2022]
Abstract
PURPOSE Classic late-infantile neuronal ceroid lipofuscinosis is characterized by progressive intellectual and motor deterioration, seizures, vision loss, and early death. Prominent chorea is an atypical feature and is rarely described in children. METHODS A four-year-old girl with seizures followed by a year-long progressive cognitive decline and a three month history of intermittent chorea leading to rapid motor deterioration. The onset of illness was marked by seizures occurring as generalized tonic-clonic seizures and myoclonic jerks. There was gradual regression of cognitive milestones with increasing forgetfulness and impaired quality and content of speech. Nine months later, she developed chorea. These movements were associated with clumsiness, incoordination, and progressive loss of motor milestones. She was unable to perform manual tasks or maintain antigravity posture resulting in unsteadiness and frequent falls. The movements were aggravated by action or excitement and were absent in sleep. RESULTS Magnetic resonance imaging depicted diffuse cerebral and cerebellar atrophy. Sequencing analysis of TPP1 gene showed a novel, homozygous, splice site mutation c.89+1G>A which resulted in nil enzyme activity and a severe phenotype with onset of disease symptoms at an early age of three years. CONCLUSIONS The presence of chorea in late-infantile neuronal ceroid lipofuscinoses is atypical but does not exclude the diagnosis of late-infantile neuronal ceroid lipofuscinoses, especially in children with psychomotor regression, seizures and diffuse brain atrophy.
Collapse
Affiliation(s)
- Arushi Gahlot Saini
- Pediatric Neurology and Neurodevelopment Unit, Department of Pediatrics, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, UT, India
| | - Naveen Sankhyan
- Pediatric Neurology and Neurodevelopment Unit, Department of Pediatrics, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, UT, India
| | - Pratibha Singhi
- Pediatric Neurology and Neurodevelopment Unit, Department of Pediatrics, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, UT, India.
| |
Collapse
|
13
|
Abstract
Phospholipase A2-associated neurodegeneration (PLAN) comprises of three disorders with overlapping presentations. The most common of these is classical or infantile-onset phospholipase A2-associated neurodegeneration, also known as infantile neuroaxonal dystrophy (INAD). Only 1 case of INAD has been reported from India till now. We report two genetically confirmed patients seen at a tertiary care pediatric hospital. Both these patients presented with infantile onset of neuroregression. We believe that INAD is underrecognized and underreported from India.
Collapse
Affiliation(s)
- Shilpa D Kulkarni
- Department of Pediatric Neurosciences, Bai Jerbai Wadia Hospital for Children, Mumbai, Maharashtra, India
| | - Meenal Garg
- Department of Pediatric Neurosciences, Bai Jerbai Wadia Hospital for Children, Mumbai, Maharashtra, India
| | - Rafat Sayed
- Department of Pediatric Neurosciences, Bai Jerbai Wadia Hospital for Children, Mumbai, Maharashtra, India
| | - Varsha A Patil
- Department of Pediatric Neurosciences, Bai Jerbai Wadia Hospital for Children, Mumbai, Maharashtra, India
| |
Collapse
|
14
|
Abstract
Fucosidosis is a rare lysosomal storage disorder due to deficiency of fucosidase enzyme, with around 100 cases reported worldwide. Here, we describe the clinical and imaging features in two siblings with fucosidosis. An 8-year-old girl presented with global developmental delay, followed by regression of acquired milestones from 3 years of age with bipyramidal, extrapyramidal involvement, coarse facies, telangiectatic lesions, dysostosis multiplex, characteristic magnetic resonance imaging finding along with undetectable levels of the fucosidase activity, which confirmed the diagnosis. Younger sibling has mild developmental delay with autistic traits with no neuroregression until now. He also has undetectable level of fucosidase enzyme activity and is being considered for stem cell transplantation. New case reports would expand the clinical spectrum, early diagnosis and help formulating appropriate therapy. Early diagnosis is crucial and hence sibling screening can be done, and those in the presymptomatic stage can undergo hematopoietic stem cell transplantation, which is potentially curable.
Collapse
Affiliation(s)
- Karthik Muthusamy
- Department of Neurological Sciences, Christian Medical College, Vellore, Tamil Nadu, India
| | - Maya Mary Thomas
- Department of Neurological Sciences, Christian Medical College, Vellore, Tamil Nadu, India
| | | | - Mathew Alexander
- Department of Neurological Sciences, Christian Medical College, Vellore, Tamil Nadu, India
| | - Sunithi Mani
- Department of Radiology, Christian Medical College, Vellore, Tamil Nadu, India
| | - Rohit N Benjamin
- Department of Neurological Sciences, Christian Medical College, Vellore, Tamil Nadu, India
| |
Collapse
|
15
|
Kotecha UH, Movva S, Sharma D, Verma J, Puri RD, Verma IC. Molecular evaluation of a novel missense mutation & an insertional truncating mutation in SUMF1 gene. Indian J Med Res 2014; 140:55-9. [PMID: 25222778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
BACKGROUND & OBJECTIVES Multiple suphphatase deficiency (MSD) is an autosomal recessive disorder affecting the post translational activation of all enzymes of the sulphatase family. To date, approximately 30 different mutations have been identified in the causative gene, sulfatase modifying factor 1 (SUMF1). We describe here the mutation analysis of a case of MSD. METHODS The proband was a four year old boy with developmental delay followed by neuroregression. He had coarse facies, appendicular hypertonia, truncal ataxia and ichthyosis limited to both lower limbs. Radiographs showed dysostosis multiplex. Clinical suspicion of MSD was confirmed by enzyme analysis of four enzymes of the sulphatase group. RESULTS The patient was compound heterozygote for a c.451A>G (p.K151E) substitution in exon 3 and a single base insertion mutation (c.690_691 InsT) in exon 5 in the SUMF1 gene. The bioinformatic analysis of the missense mutation revealed no apparent effect on the overall structure. However, the mutated 151-amino acid residue was found to be adjacent to the substrate binding and the active site residues, thereby affecting the substrate binding and/or catalytic activity, resulting in almost complete loss of enzyme function. CONCLUSIONS The two mutations identified in the present case were novel. This is perhaps the first report of an insertion mutation in SUMF1 causing premature truncation of the protein.
Collapse
|