Qualification: 
DCH, MBBS
sheelanampoothiri@aims.amrita.edu

Dr. Sheela Nampoothiri currently serves as Professor at the Department of Paediatrics, Amrita School of Medicine, Kochi.

Qualification : MBBS, DCH, Dip NB (Paed), MSc Medical Genetics (Glasgow)

Publications

Publication Type: Journal Article

Year of Publication Title

2015

K. Renugadevi, Mary, J. Asnet, Perumalsamy, V., Seshadri, S., Jagadeesh, S., Suresh, B., Dr. Sheela Nampoothiri, Shenbagarathai, R., Krishnaswamy, S., and Sundaresan, P., “Molecular Genetic Testing for Carrier-Prenatal Diagnosis and Computational Analysis of Oculocutaneous Albinism Type 1”, Genetic Disorders & Genetic Reports, vol. 2014, 2015.[Abstract]


In India epidemiological-communicable diseases are on the decline due to better living conditions and healthcare delivery in the society. On the other hand, the relative increase in the prevalence of genetic diseases threatens to be a public health problem. One such group of metabolic disorder is Albinism. General population based oculocutaneous albinism (OCA) carrier screening is controversial in all the races. Because of the occurrence of this disease in prior generations, it is necessary to create the knowledge, so that even uneducated affected family members will be willing to diagnose the disease status. As a result, the carrier detection in general population has become necessary in Indian population. More »»

2014

J. Sheth, Mistri, M., Datar, C., Kalane, U., Patil, S., Kamate, M., Shah, H., Dr. Sheela Nampoothiri, Gupta, S., and Sheth, F., “Expanding the spectrum of HEXA mutations in Indian patients with Tay–Sachs disease”, Molecular Genetics and Metabolism Reports, vol. 1, pp. 425–430, 2014.[Abstract]


Tay–Sachs disease is an autosomal recessive neurodegenerative disorder occurring due to impaired activity of β-hexosaminidase-A (EC 3.2.1.52), resulting from the mutation in HEXA gene. Very little is known about the molecular pathology of TSD in Indian children except for a few mutations identified by us. The present study is aimed to determine additional mutations leading to Tay–Sachs disease in nine patients confirmed by the deficiency of β-hexosaminidase-A (C (D175A) and c.805G>C (p.G269R) in one case; and one small 1 bp deletion c.426delT (p.F142LfsX57) and one splice site mutation c.459+4A>C in the other two cases respectively. None of these mutations were detected in 100 chromosomes from healthy individuals of the same ethnic group. Three previously reported missense mutations, (i) c.532C>T (p.R178C), (ii) c.964G>T (p.D322Y), and (iii) c.1385A>T (p.E462V); two nonsense mutations (i) c.709C>T (p.Q237X) and (ii) c.1528C>T (p.R510X), one 4 bp insertion c.1277_1278insTATC (p.Y427IfsX5) and one splice site mutation c.459+5G>A were also identified in six cases. We observe from this study that novel mutations are more frequently observed in Indian patients with Tay–Sachs disease with clustering of ~ 73% of disease causing mutations in exons 5 to 12. This database can be used for a carrier rate screening in the larger population of the country. More »»

2014

Dr. Rajesh kannan, Dr. Mahesh K., Dr. Sheela Nampoothiri, Malfait, F., De Paepe, A., Moorthy, S., and , “Imaging findings in a distinct lethal inherited arteriopathy syndrome associated with a novel mutation in the FBLN4 gene”, European radiology, vol. 24, pp. 1742–1748, 2014.[Abstract]


Objectives We present the imaging findings of a newly identified lethal arteriopathy associated with a novel mutation in the gene encoding fibulin-4, occurring in a distinct community from southern India. Material and methods A total of 31 children from a distinct population subgroup who presented with characteristic arterial dilatation and tortuosity were studied. All children except one belonged to unrelated families from an ethno-religious group (Muslim) from the northern coastal belt of southern India. CT angiography was performed in 30 children and contrast MRA in one. Results Impressive dilatation and elongation of ascending aorta, arch, descending aorta and main pulmonary arteries with characteristic narrowing of aortic isthmus were seen in all patients. Stenosis of arch branches, abdominal visceral branches and pulmonary artery branches was observed in 21 (68 %), 23 (62.5 %) and 20 (65 %) patients respectively. Genetic studies revealed an identical mutation in exon 7 of the FBLN4 gene. On follow-up, 27 of them had died before the age of 3 years and only two children were alive after the age of 4 years. Conclusions FBLN4-associated vasculopathy is a highly lethal disease characterized by severe aneurysmal dilatation of thoracic aorta, its branches and pulmonary arteries with stenoses at typical locations. More »»

2014

V. R. Boggula, Shukla, A., Danda, S., Hariharan, S. V., Dr. Sheela Nampoothiri, Kumar, R., Phadke, S. R., and , “Clinical utility of multiplex ligation-dependent probe amplification technique in identification of aetiology of unexplained mental retardation: a study in 203 Indian patients”, The Indian journal of medical research, vol. 139, p. 66, 2014.[Abstract]


Background & objectives: Developmental delay (DD)/mental retardation also described as intellectual disability (ID), is seen in 1-3 per cent of general population. Diagnosis continues to be a challenge at clinical level. With the advancement of new molecular cytogenetic techniques such as cytogenetic microarray (CMA), multiplex ligation-dependent probe amplification (MLPA) techniques, many microdeletion/microduplication syndromes with DD/ID are now delineated. MLPA technique can probe 40-50 genomic regions in a single reaction and is being used for evaluation of cases with DD/ID. In this study we evaluated the clinical utility of MLPA techniques with different probe sets to identify the aetiology of unexplained mental retardation in patients with ID/DD.
Methods: A total of 203 randomly selected DD/ID cases with/without malformations were studied. MLPA probe sets for subtelomeric regions (P070/P036) and common microdeletions/microduplications (P245-A2) and X-chromosome (P106) were used. Positive cases with MLPA technique were confirmed using either fluorescence in situ hybridization (FISH) or follow up confirmatory MLPA probe sets. 
Results: The overall detection rate was found to be 9.3 per cent (19 out of 203). The detection rates were 6.9 and 7.4 per cent for common microdeletion/microduplication and subtelomeric probe sets, respectively. No abnormality was detected with probe set for X-linked ID. The subtelomeric abnormalities detected included deletions of 1p36.33, 4p, 5p, 9p, 9q, 13q telomeric regions and duplication of 9pter. The deletions/duplications detected in non telomeric regions include regions for Prader Willi/Angelman regions, Williams syndrome, Smith Magenis syndrome and Velocardiofacial syndrome.
Interpretation & conclusions: Our results show that the use of P245-A2 and P070/P036-E1 probes gives good diagnostic yield. Though MLPA cannot probe the whole genome like cytogenetic microarray, due to its ease and relative low cost it is an important technique for evaluation of cases with DD/ID.

More »»

2014

C. Ankleshwaria, Mistri, M., Bavdekar, A., Muranjan, M., Dave, U., Tamhankar, P., Khanna, V., Jasinge, E., Dr. Sheela Nampoothiri, and Kadangot, S. Edayankara, “Novel mutations in the glucocerebrosidase gene of Indian patients with Gaucher disease”, Journal of human genetics, vol. 59, pp. 223–228, 2014.[Abstract]


Gaucher disease (GD) is the most common glycolipid storage disorder resulting from glucocerebrosidase deficiency due to mutations in the GBA gene. Study was performed in 33 unrelated patients with low β-glucosidase activity in leukocytes and/or fibroblasts. The exons and exon–intron boundaries of the GBA gene were bidirectionally sequenced using an automated sequencer. Mutations were confirmed in parents and were looked up in public databases, and in silico analysis was carried for novel mutations. We identified two novel missense mutations G289A (c.866G>C) and I466S (c.1397T>G) in exons 7 and 10, respectively, in two (6.06%) patients that destabilize the protein structure. L444P (c.1448T>C) was the most common mutation identified in 20/33 (60.60%) non-neuronopathic and 1/33 (3.03%) sub-acute neuronopathic form based on clinical presentation at the time of investigation. Other nine rare mutations were: R463C (c.1504C>T), R395C (c.1300C>T), R359Q (c.1193G>A), G355D (c.1181G>A), V352M (c.1171G>A) and S356F (c.1184C>T) found in each patient (18.18%). Compound heterozygous mutation L444P (c.1448T>C)/R496C (c.1603C>T) in exon 10/11 and L444P (c.1448T>C)/R329C (c.1102C>T) were observed in exon 10/8 in one each patient (6.06%). Two patients (6.06%) from Sri Lanka showed E326K (c.1093G>A) mutation in exon 8. We conclude that L444P is the most common mutant allele with exons 8 and 10 as the hot spot region of GBA gene observed in Indian GD patients. More »»