Katta Girisha

Katta Girisha
Manipal Academy of Higher Education | MAHE · Department of Medical Genetics

MD, DM

About

229
Publications
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Publications

Publications (229)
Article
Pathogenic variations in SMPD1 lead to Acid Sphingomyelinase Deficiency (ASMD), i.e., Niemann-Pick disease (NPD) type A and B (NPA, NPB), which is a recessive lysosomal storage disease. The knowledge of variant spectrum in Indian patients is crucial for early and accurate NPD diagnosis and genetic counseling of families. In this study, we recruited...
Article
Knobloch syndrome (KS) is an autosomal recessive disorder caused by biallelic pathogenic variants in COL18A1. KS clinically manifests with the typical eye findings (high myopia, vitreoretinal degeneration, retinal detachment, and lens subluxation), variable neurological findings (occipital encephalocele, polymicrogyria, cerebellar malformations, ep...
Article
Leigh syndrome is a clinically and radiologically heterogeneous condition with approximately 75 genes, nuclear and mitochondrial, known to be implicated in its pathogenesis. Leigh syndrome due to complex II deficiency constitutes 2% to 7% of these cases. Previously, nine individuals with Leigh syndrome have been reported with pathogenic variants in...
Article
Full-text available
Turner syndrome (TS) is a common multiple congenital anomaly syndrome resulting from complete or partial absence of the second X chromosome. In this study, we explore the phenotype of TS in diverse populations using clinical examination and facial analysis technology. Clinical data from 78 individuals and images from 108 individuals with TS from 19...
Article
Fetal akinesia deformation sequence (FADS) is a clinically and genetically heterogeneous condition. Pathogenic variants in DOK7 are known to cause myasthenic syndrome, congenital, 10 (MIM#254300) and, rarely (reported in a single family) lethal FADS. Herein, we describe a biallelic variant c.1263dupC in DOK7, known to cause congenital myasthenic sy...
Article
Nephronophthisis is an autosomal recessive disease characterized by cystic kidney disease with progression to end-stage kidney disease in children and adolescents with or without extra-renal involvement. It is caused by biallelic pathogenic variants in 19 genes including INVS that encodes a ciliary protein essential for renal development and left-r...
Article
The phenotypic spectrum of Type 2 collagenopathies ranges from lethal achondrogenesis Type 2 to milder osteoarthritis with mild chondrodysplasia. All of them are monoallelic except for the two recent reports showing that biallelic variants in COL2A1 can cause spondyloepiphyseal dysplasia congenita in two children. Here we report two additional fami...
Article
VAC14-related disorders include two distinct phenotypes, striatonigral degeneration [MIM# 617054] and Yunis–Varon syndrome. Striatonigral degeneration is a recently described childhood onset dystonia caused by pathogenic variants in VAC14. It is characterized by a period of apparent normalcy followed by abrupt onset neuroregression, dystonia, invol...
Article
Heterogeneous nuclear ribonucleoproteins (hnRNPs) are RNA binding proteins, which aid in maturation, stabilization, and transport of mRNA. They have a significant role in cellular nucleic acid metabolism. The hnRNPs alter gene expression and are linked to various neurodegenerative disorders and cancers. Previously, six unrelated girls with developm...
Article
Coffin–Siris syndrome (CSS, MIM#135900) is a congenital disorder characterized by coarse facial features, intellectual disability, and hypoplasia of the fifth digit and nails. Pathogenic variants for CSS have been found in genes encoding proteins in the BAF (BRG1-associated factor) chromatin-remodeling complex. To date, more than 150 CSS patients w...
Article
Mutations in genes encoding components of the intraflagellar transport (IFT) complexes have previously been associated with a spectrum of diseases collectively termed ciliopathies. Ciliopathies relate to defects in the formation or function of the cilium, a sensory or motile organelle present on the surface of most cell types. IFT52 is a key compon...
Article
Tay–Sachs disease (TSD) (OMIM) is a neurodegenerative lysosomal storage disorder caused due to mutations in the HEXA gene. To date, nearly 190 mutations have been reported in HEXA gene. Here, we have characterized 34 enzymatically confirmed TSD families to investigate the presence of novel as well as known variants in HEXA gene. Overall study detec...
Article
Meckel syndrome (MKS) is a perinatally lethal, genetically heterogeneous, autosomal recessive condition caused by defective primary cilium formation leading to polydactyly, multiple cysts in kidneys and malformations of nervous system. We performed exome sequencing in six fetuses from six unrelated families with MKS. We identified seven novel varia...
Article
MYOD1 is a myogenic transcription factor which plays an important role in differentiation of myocytes. A biallelic loss‐of‐function variant, c.188C<A p.(Ser63*) in MYOD1 was identified as a cause for lethal fetal akinesia syndrome in three neonates from two sibships in a family by autozygosity mapping and whole exome sequencing. Recently, an eight‐...
Article
The risk for recurrence of non disjunction trisomy 21 is conventionally considered to be less than 1%. Within a span of 3 years, we observed recurrence of non disjunction trisomies in four families. The objective of the present study was to determine low level mosaicism in either of the couple and to identify the parental origin of additional chrom...
Conference Paper
Background Juvenile idiopathic arthritis (JIA) is a complex group of disorders characterized by wide phenotypic diversity and genetic heterogeneity. It has multifactorial etiology varying among different subtypes. There are emerging reports on new gene loci being identified especially in families with many affected members (1,2) Objectives To repo...
Article
GATA zinc finger domain-containing 2B (GATAD2B) encodes p66beta, a subunit of transcription repressor complex methyl-CpG-binding protein-1 histone deacetylase complex/nucleosome remodelling and deacetylase, and mediates gene silencing. Pathogenic variants in GATAD2B are known to cause mental retardation, autosomal dominant 18, characterized by inte...
Article
Full-text available
Arthrogryposis is a clinical finding that is present either as a feature of a neuromuscular condition or as part of a systemic disease in over 400 Mendelian conditions. The underlying molecular etiology remains largely unknown because of genetic and phenotypic heterogeneity. We applied exome sequencing (ES) in a cohort of 89 families with the clini...
Article
Ribose 5-phosphate isomerase deficiency is a rare genetic leukoencephalopathy caused by pathogenic sequence variants in RPIA, that encodes ribose 5-phosphate isomerase, an enzyme in the pentose phosphate pathway. Till date, only three individuals with ribose 5-phosphate isomerase deficiency have been described in literature. We report on a subject...
Article
Cartilage hair hypoplasia (CHH), anauxetic dysplasia 1, and anauxetic dysplasia 2 are rare metaphyseal dysplasias caused by biallelic pathogenic variants in RMRP and POP1, which encode the components of RNAse‐MRP endoribonuclease complex (RMRP) in ribosomal biogenesis pathway. Nucleolus and neural progenitor protein (NEPRO), encoded by NEPRO (C3orf...
Article
The cover image is based on the Clinical Report Variants in the transcriptional corepressor BCORL1 are associated with an X‐linked disorder of intellectual disability, dysmorphic features, and behavioral abnormalities by Anju Shukla et al., DOI: 10.1002/ajmg.a.61118.
Article
BCORL1, a transcriptional corepressor, is involved in negative gene regulation through associations with several protein complexes including Class II histone deacetylases (HDACs). Acquired somatic mutations in BCORL1 have been implicated in the pathogenesis of several malignancies, but germline mutations of BCORL1 have not been associated with a sp...
Article
ITPA related epileptic encephalopathy (epileptic encephalopathy, early infantile, 35) is a rare inborn error of metabolism. All reported individuals with this condition, including the present case manifest global developmental delay, seizures, progressive postnatal microcephaly, hypotonia, thin corpus callosum, cerebral atrophy, delayed myelination...
Article
Full-text available
Background Gaucher disease is a rare pan-ethnic, lysosomal storage disorder resulting due to beta-Glucosidase (GBA1) gene defect. This leads to the glucocerebrosidase enzyme deficiency and an increased accumulation of undegraded glycolipid glucocerebroside inside the cells’ lysosomes. To date, nearly 460 mutations have been described in the GBA1 ge...
Article
Full-text available
SPONASTRIME dysplasia is a rare, recessive skeletal dysplasia characterized by short stature, facial dysmorphism, and aberrant radiographic findings of the spine and long bone metaphysis. No causative genetic alterations for SPONASTRIME dysplasia have yet been determined. Using whole-exome sequencing (WES), we identified bi-allelic TONSL mutations...
Poster
Full-text available
ABSTRACT: Background- Mental retardation or broadly known as Intellectual disability (ID) is characterized by significantly subaverage intellectual functioning with deficits in adaptive behavior and motor skills, is of common occurrence throughout the world. Depending on the diagnostic methods used, 2-85 individuals per 1000 are diagnosed with ID....
Article
Full-text available
Cornelia de Lange syndrome (CdLS) is a dominant multisystemic malformation syndrome due to mutations in five genes—NIPBL, SMC1A, HDAC8, SMC3, and RAD21. The characteristic facial dysmorphisms include microcephaly, arched eyebrows, synophrys, short nose with depressed bridge and anteverted nares, long philtrum, thin lips, micrognathia, and hypertric...
Article
Physical stress, including high temperatures, may damage the central metabolic nicotinamide nucleotide cofactors [NAD(P)H], generating toxic derivatives [NAD(P)HX]. The highly conserved enzyme NAD(P)HX dehydratase (NAXD) is essential for intracellular repair of NAD(P)HX. Here we present a series of infants and children who suffered episodes of febr...
Article
Background Andersen Tawil Syndrome (ATS) is a rare familial periodic paralysis that typically also affects the heart and skeletal system. Ventricular arrhythmias (VA) are profound, difficult to control but minimally symptomatic. In this report we describe an atypical phenotype of ATS in 2 related families. We also report our experience with phenyto...
Article
Full-text available
Neurodevelopmental disorders (NDD) are genetically and phenotypically heterogeneous conditions due to defects in genes involved in development and function of the nervous system. Individuals with NDD, in addition to their primary neurodevelopmental phenotype, may also have accompanying syndromic features that can be very helpful diagnostically espe...
Article
Spondyloepimetaphyseal dysplasias (SEMD) are a group of genetically heterogeneous skeletal disorders characterized by abnormal vertebral bodies and epimetaphyseal abnormalities. We investigated two families with a new SEMD type with one proband each. They showed mild facial dysmorphism, flat vertebral bodies (platyspondyly), large epiphyses, metaph...
Article
Waardenburg syndrome (WS) is a disorder of neural crest cell migration characterized by auditory and pigmentary abnormalities. We investigated a cohort of 14 families (16 subjects) either by targeted sequencing or whole exome sequencing. Thirteen of these families were clinically diagnosed with WS and one family with isolated non‐syndromic hearing...
Article
Genetic heterogeneity, high burden and the paucity of genetic testing for rare diseases challenge genomic healthcare for these disorders in India. Here we report our experience over the past decade, of establishing the genomic evaluation of skeletal dysplasia at a tertiary university hospital in India. Research or clinical genomic testing was carri...
Article
Glycogen storage disease IV (GSD IV), caused by a defect in GBE1, is a clinically heterogeneous disorder. A classical hepatic form and a neuromuscular form have been described. The severe neuromuscular form presents as a fetal akinesia deformation sequence or a congenital subtype. We ascertained three unrelated families with fetuses/neonates who pr...
Article
Hereditary spastic paraplegias are a group of genetically heterogeneous neurological disorders characterized by progressive weakness and spasticity of lower limbs. We ascertained five families with eight individuals with hereditary spastic paraplegia. Pathogenic variants were identified by exome sequencing of index cases. The cohort consists of thr...
Article
Full-text available
Purpose: Congenital microcephaly (CM) is an important birth defect with long term neurological sequelae. We aimed to perform detailed phenotypic and genomic analysis of patients with Mendelian forms of CM. Methods: Clinical phenotyping, targeted or exome sequencing, and autozygome analysis. Results: We describe 150 patients (104 families) with...
Article
Full-text available
Background: Mutations in the X-linked gene filamin A (FLNA), encoding the actin-binding protein FLNA, cause a wide spectrum of connective tissue, skeletal, cardiovascular and/or gastrointestinal manifestations. Males are typically more severely affected than females with common pre- or perinatal death. Case presentation: We provide a genotype- a...
Article
Full-text available
In this Letter, the surname of author Lena Vlaminck was misspelled 'Vlaeminck'. This error has been corrected online.
Article
Biallelic pathogenic variants in KLHL7 are known to result in Crisponi syndrome (CS)/cold-induced sweating syndrome type 1 (CISS1) like phenotype and Bohring-Opitz-like syndrome. In this report, a trio whole-exome sequencing (WES) was performed in proband with cold-induced sweating, microcephaly, facial dysmorphism, spasticity, failure to thrive, p...
Article
We report a boy with Eiken syndrome caused by a homozygous missense variant in PTH1R c.103G>A [p.(Glu35Lys)]. Eiken syndrome is a very rare skeletal dysplasia due to bi‐allelic variants in PTH1R. Only one affected family has been known to‐date. The hallmarks include delayed ossification of bone including the epiphyses, pubic symphysis, and primary...
Article
Full-text available
Medical genomics research performed in diverse population facilitates a better understanding of the genetic basis of developmental disorders, with regional implications for community genetics. Autosomal recessive mitochondrial complex I deficiency (MCID) accounts for a constellation of clinical features, including encephalopathies, myopathies, and...
Article
Aneuploidies occur in about 5% of clinically recognized pregnancies. Facial gestalt is a vital tool for the clinical diagnosis of trisomy 21. Facial anomalies are subtle in fetal life and challenging for a clinician not familiar with perinatal dysmorphology. Here, we present the facial profile and additional features in six fetuses with Down syndro...
Poster
Introduction: In human and other mammalian cells, a unique large tRNA multi-synthetase complex organizes 9 cytoplasmic aminoacyl-tRNA synthetases consisting of bifunctional, as well as the monospecific tRNA synthetases and 3 non-enzyme factors, namely p43 (AIMP1), p38 (AIMP2) and p18 (AIMP3). The p38/AIMP2 protein is a key component of the multi-AR...
Article
Animal studies have demonstrated the critical roles of the patatin‐like protein family plays in cellular growth, lipid homeostasis, and second messenger signaling the nervous system. Of the nine known calcium‐independent phospholipase A2γ, only PNPLA2, PNLPA6, PNPLA9 and most recently a single patient with PNPLA8 are associated with mitochondrial‐r...
Article
Full-text available
Williams–Beuren syndrome (WBS) is a common microdeletion syndrome characterized by a 1.5Mb deletion in 7q11.23. The phenotype of WBS has been well described in populations of European descent with not as much attention given to other ethnicities. In this study, individuals with WBS from diverse populations were assessed clinically and by facial ana...
Article
The cover image, by Paul Kruszka et al., is based on the Original Article Williams‐Beuren Syndrome in Diverse Populations, DOI: 10.1002/ajmg.a.38672
Article
Ischiospinal dysostosis (ISD) is a rare skeletal dysplasia characterized by ischial hypoplasia, vertebral segmentation defects and rib deformity (Nishimura et al. 1999). Renal abnormalities, sacral hypoplasia and developmental delay are variable features associated with ISD (Nishimura et al. 2003). Exome sequencing in two families with ISD identifi...
Article
Full-text available
Biallelic pathogenic variants in PIBF1 have been identified as one of the genetic etiologies of Joubert syndrome. We report a two-year-old girl with global developmental delay, facial dysmorphism, hypotonia, enlarged cystic kidneys, molar tooth sign, and thinning of corpus callosum. A novel homozygous 36-bp insertion in PIBF1 (c.1181_1182ins36) was...
Article
Iron-sulfur cluster assembly 1 (ISCA1) is one of the essential proteins operating in the mitochondrial iron-sulfur (Fe-S) cluster biogenesis pathway. We reported the variant c.259G > A [p.(Glu87Lys)] in homozygous state in exon 4 of the ISCA1 gene as the likely cause of multiple mitochondrial dysfunction syndrome 5 in a previous publication. We now...
Article
Full-text available
We aimed to review the contributions by Indian researchers to the subspecialty of skeletal dysplasias (SDs). Literature search using specific keywords in PubMed was performed to retrieve all the published literature on SDs as on July 6, 2017. All published literature on SDs wherein at least one author was from an Indian institute was included. Publ...
Article
We aimed to review the contributions by Indian researchers to the subspecialty of skeletal dysplasias (SDs). Literature search using specific keywords in PubMed was performed to retrieve all the published literature on SDs as on July 6, 2017. All published literature on SDs wherein at least one author was from an Indian institute was included. Publ...
Article
The location and/or type of variants in FLNB result in a spectrum of osteochondrodysplasias ranging from mild forms, like spondylocarpotarsal synostosis syndrome and Larsen syndrome, to severe perinatal lethal forms, such as atelosteogenesis I and III and Boomerang dysplasia. Spondylocarpotarsal synostosis syndrome is characterized by disproportion...
Presentation
Background and Objective- Intellectual disability (ID), a phenomenon characterized by significantly subaverage intellectual functioning with deficits in adaptive behavior, is of common occurrence throughout the world. Depending on the diagnostic methods used, 2-85 individuals per 1000 are diagnosed with ID. Genetic abnormalities are frequently enco...
Article
Full-text available
Pontocerebellar hypoplasia (PCH) represents a group of autosomal-recessive progressive neurodegenerative disorders of prenatal onset. Eleven PCH subtypes are classified according to clinical, neuroimaging and genetic findings. Individuals with PCH type 9 (PCH9) have a unique combination of postnatal microcephaly, hypoplastic cerebellum and pons, an...
Article
Full-text available
Asparagine synthetase deficiency (ASNSD, MIM 615574) is a recently delineated rare neurometabolic disorder caused by mutations in ASNS (MIM 108370) (Ruzzo et al., 2013). It is characterized by congenital and/or postnatal progressive microcephaly, global developmental delay, seizures, growth retardation, cerebral atrophy and simplified gyral pattern...
Article
Osteogenesis Imperfecta (OI) is a clinically and genetically heterogeneous disorder. Although differential diagnosis is greatly facilitated by next generation sequencing, its availability can vary considerably. In this study, we compared targeted gene panel or exome sequencing with clinical scoring and grouping in a cohort of 50 OI index patients r...
Article
Full-text available
Objective We built India Allele Finder, an online searchable database and command line tool, that gives researchers access to variant frequencies of Indian Telugu individuals, using publicly available fastq data from the 1000 Genomes Project. Access to appropriate population-based genomic variant annotation can accelerate the interpretation of geno...
Article
Full-text available
The skeletal ciliopathies are a heterogeneous group of disorders with a significant clinical and genetic variability and the main clinical features are thoracic hypoplasia and short tubular bones. To date, 25 genes have been identified in association with skeletal ciliopathies. Mutations in the KIAA0753 gene have recently been associated with Joube...
Article
Full-text available
Aicardi–Goutières syndrome is an early-onset severe neurological disorder characterized by intracranial calcification, white matter abnormalities, hepatosplenomegaly, cerebrospinal fluid lymphocytosis, and elevated interferon-α levels, thus mimicking congenital viral infections. It is a genetically heterogeneous condition and autosomal recessive an...
Poster
We ascertained two consanguineous families with two affected children each with microcephaly, refractory seizures, intellectual disability and spastic quadriparesis. Brain MR imaging showed atrophy of cerebrum, cerebellum and spinal cord, prominent cisterna magna, symmetric T2 hypointensities in the bilateral basal ganglia and thinning of corpus ca...
Article
We ascertained two unrelated consanguineous families with two affected children each having microcephaly, refractory seizures, intellectual disability and spastic quadriparesis. Magnetic resonance imaging showed atrophy of cerebrum, cerebellum and spinal cord, prominent cisterna magna, symmetric T2 hypointensities in the bilateral basal ganglia and...