Genetic testing in four Indian families with suspected Stickler syndrome

Purpose: Stickler syndrome is associated with the development of rhegmatogenous retinal detachment (RRD), and often presents with ocular, auditory, skeletal, and orofacial abnormalities. Molecular analysis has proven effective in diagnosis, confirmation and classification of the disease. We aimed to describe the utility of next?generation sequencing (NGS) in genetic analysis of four Indian families with suspected Stickler syndrome. Methods: The index cases presented with retinal detachment with family history. Genetic analysis in the index case was performed by next?generation sequencing of inherited retinal degeneration genes, and validated by Sanger sequencing followed by co?segregation analysis in the other family members. Results: Twenty patients were included for the genetic analysis (15 males and 5 females from four families). Clinical details were available for 15 patients (30 eyes). Fourteen eyes (11 patients) developed RRD. In the 16 eyes without RRD, 8 underwent barrage laser to lattice degeneration and 8 were under observation. Disease segregating heterozygous mutations with pathogenic/likely pathogenic effect was identified in COL2A1 (c.4318?1G>A, c.141G>A, c.1221+1G>A for 3 families) and COL11A1 (c.1737+1 G>A for 1 family) gene. In addition to the mutation in the COL2A1 gene, a pathogenic heterozygous variant associated with risk for arrhythmogenic right ventricular cardiomyopathy (ARVC) was identified in one member. Conclusion: NGS testing confirmed the presence of the causative gene for Stickler syndrome in the index case followed by evaluation of family members and confirmation of genetic and ocular findings. We believe that this may be the first such report of families with RRD from India

Identification of a COL2A1 mutation in a Chinese family with Stickler syndrome type 1 via whole exome sequencing / 中华实验眼科杂志

Objective:To identify the disease-causing mutation in a Chinese family with Stickler syndrome type 1.Methods:The pedigree investigation was conducted.A Chinese family with Stickler syndrome type 1 was enrolled in the Shantou International Eye Center in June 2012.Medical history collection and clinical examinations, such as vision, intraocular pressure, slit lamp microscopy and fundus, were carried out in all the included family members and the diagnosis was made by clinical experts.Total genomic DNAs were extracted from the peripheral blood samples (5 ml) obtained from 5 patients and 4 healthy members.The potential variant of the proband's father Ⅲ-5 were screened by whole exome sequencing (WES) and stepwise bioinformatic analysis.The segregation and mutation conformation of the variant was verified by Sanger sequencing.The pathogenicity of the variant was predicted by SIFT, Polyphen2, and MutationTaster.Conservation and three-dimensional structure of amino acid mutation were analyzed by multiple sequence alignment and UniProt.This study adhered to the Declaration of Helsinki.The study protocol was approved by the Ethics Committee of Joint Shantou International Eye Center (No.EC20110310[2]-P02).Written informed consent was obtained from each subject or the guardian.Results:An autosomal dominant inherence in 39 members of 4 generations including 15 patients and 24 phenotypically normal members was found in the family.The proband (Ⅳ-4) showed high myopia, retinal detachment and strabismus in the right eye, and the left eye was blind.A patient (Ⅲ-5) showed high myopia and cataract in the right eye, atrophy in the left eye.A patient (Ⅳ-9) showed binocular high myopia.A heterozygous variation, c.1693C>T: p.Arg565Cys, within the exon 26 of COL2A1 gene was revealed in patient Ⅲ-5, which was only found in the patients and not in phenotypically normal members, indiacating co-separation in this family.The variant was predicted to be a severe damage by SIFT, Polyphen2 and MutationTaster.The amino acid mutation at position 565 was highly conservative among human, mouse, rat, bovine and Xenopus laevis, which caused the arginine to cysteine substitution at the X position in triple helix repeat region Gly-X-Y, affecting the function of fibrous protein and becoming pathogenic. Conclusions:Variant c.1693C>T: p.Arg565Cys in COL2A1 gene is disease-causing in this family and this is the first report about the variant in China.

Analgesia obstétrica en la paciente con síndrome de Stickler: un reporte de caso y revisión de la literatura / Obstetric analgesia in the patient with Stickler syndrome: a case report and review of the literature

Resumen: El síndrome de Stickler tiene una incidencia de uno en 7,500-9,000 recién nacidos. Es una enfermedad del tejido conectivo con patrón de herencia autosómico dominante en la mayoría de los casos, aunque también con patrón recesivo, por afección patogénica de genes procolágeno como COL2A1, COL11A1, entre otros. Cursa con manifestaciones multisistémicas craneofaciales, oculares, auditivas, esqueléticas/articulares y se ha asociado a prolapso de la válvula mitral. Se diferencian tres tipos: tipo I (el más frecuente, 75%) o síndrome de Stickler completo, tipo II o síndrome de Stickler ocular y el tipo III u oto-espóndilo-displasia megaepifisaria. El diagnóstico se realiza al probar las manifestaciones o al demostrar una variante genética patogénica. Respecto al manejo anestésico en la paciente obstétrica, se recomienda evitar la anestesia general. Se presenta el caso de una paciente de 26 años con diagnóstico de síndrome de Stickler tipo I, con embarazo a término y su relación con la anestesia neuroaxial. A pesar de su incidencia, no existe literatura médica acerca del manejo de la anestesia neuroaxial en este tipo de pacientes.

Abstract: Stickler syndrome has an incidence of 1/7.500-9.000 in newborns. It is a connective tissue disease with an autosomal dominant inheritance pattern in most cases, but also with a recessive pattern, due to the pathogenic involvement of procollagen genes such as COL2A1, COL11A1, among others. It is characterized by craniofacial, ocular, auditory and skeletal/joint multisystemic signs and symptoms, and has been associated with prolapse of the mitral valve. Three types are differentiated: type I (the most frequent, 75%) or complete Stickler syndrome, type II or ocular Stickler syndrome and type III or oto-espondilo-megaepiphyseal dysplasia. The diagnosis is made by confirming the signs and symptoms or by verifying the presence of a pathogenic genetic variant. With respect to the anesthetic management in the obstetric patient, it is recommended to avoid general anesthesia. The article illustrates the case of a female patient of 26 years with Stickler syndrome type I and full-term pregnancy, and associated implications for neuroaxial anesthesia. Despite its incidence, there is no medical literature on the management of neuraxial anesthesia in this type of patients.

Two Likely Pathogenic Variants of COL2A1 in Unrelated Korean Patients With Ocular-Only Variants of Stickler Syndrome: The First Molecular Diagnosis in Korea

Stickler syndrome is a genetically heterogeneous disorder that affects the ocular, auditory, and musculoskeletal systems. Ocular-only variant of Stickler syndrome type 1 (OSTL1) is characterized by high risk of retinal detachment without systemic involvement and is caused by alternatively spliced exon 2 mutation of COL2A1. We report the cases of two Korean families with OSTL1 carrying likely pathogenic variants of COL2A1. All patients presented with membranous vitreous anomaly, peripheral retinal degeneration, and/or rhegmatogenous retinal detachment, but no systemic manifestations. By genetic analysis, two likely pathogenic non-exon 2 variants, c.2678dupC (p.Ala895Serfs*49) and c.3327+ 1G>C, were identified in COL2A1. Our results demonstrate that COL2A1 defects in OSTL1 are not confined to mutations in exon 2. Together with molecular data, ophthalmologists should consider genetic diagnosis of Stickler syndrome in patients with vitreous anomaly to prevent blindness from retinal detachment. To our knowledge, this is the first report of genetically confirmed OSTL1 in Korea.

A Case of Familial Stickler Syndrome in a Newborn with COL2A1 Gene Mutation / 대한주산의학회잡지

Stickler syndrome is a progressive, hereditary disorder of connective tissue caused by mutations in different collagen genes. It is characterized by distinctive ocular, auditory, skeletal and oro-facial abnormalities and associated with long-term respiratory, nutritional, and developmental difficulties. Therefore, early detection and early treatment of Stickler syndrome is very important. We reported a case of Stickler syndrome in a newborn with family history and COL2A1 gene mutation.

A Case of Type 1 Stickler Syndrome Caused by a Novel Mutation in COL2A1 / 대한내과학회지

Stickler syndrome is a genetic disorder characterized by ophthalmologic, craniofacial, audiologic, and joint problems. In this report, we describe a 10-year-old boy presenting with a flat face, high myopia, retinal detachment, arthropathy, short stature, and mental retardation. Sequencing of the COL2A1 gene revealed a novel mutation, c.3055C > T (p.Pro1019Ser), consistent with a diagnosis of Type 1 Stickler Syndrome.

Clinical and genetic research in a Chinese family with Stickler syndrome type 1 / 中华实验眼科杂志

Background Stickler syndrome is a genetic connective tissue disorder that affects the ocular,skeletal,orofacial and auditory systems.To determine the gene mutation loci can offer a basis for genetic diagnosis and management of Stickler syndrome.Objective The aim of this study was to research the clinical characteristics of a pedigree with Stickler syndrome and identify the disease-causing gene mutation.Methods This study was approved by Ethic Committee of Peking Union Medical College Hospital.The clinical study and pedigree analysis were performed in one family with Stickler syndrome type Ⅰ (STL Ⅰ).Nine family members were examined with informed consent.The entire coding regions of COL2A1 gene with flanking intronic regions were amplified by PCR and directly sequenced.The detected sequence change was confirmed to be mutationloci by examining whether they existed in normal control individuals.Mutant proteins were predicted with online software.Results There were 4 generations and 11 members in this family,and 2 members died,including 1 patient.Three patients were found in 9living families.Inheritance of this family complicd with an autosomal dominant inheritance mode.All affected individuals showed the consistent phenotypes with STL Ⅰ,including high myopia,membranous vitreous anomaly and surface central flat,short nose,palatoschisis,etc.Mutation screening of COL2A1 gene revealed that the first base of intron 12 was deleted(IVS12+1G del).Nucleotide sequence analysis showed that this mutation led to the functional abnormal of this gene by forming termination cordon in advance.This mutation occurred in all affected individuals,however,no mutation was observed in any unaffected member or 100 normal unrelated individuals.Conclusions This study identifies a novel splice-site mutation(IVS12+ 1G del)in COL2A1 gene in a Chinese STL Ⅰ pedigree.This is the first report on a mutation in a Chinese STL Ⅰ family.

An anesthetic experience in a patient with Stickler sydrome: A case report

Stickler syndrome is a connective tissue dysplasia disorder with characteristic midface hypoplasia, retromicrognathia, cleft palate, and a moon-shaped appearance. Incidence of the syndrome is estimated at around 1/10000 and the disorder is considered to be caused by mutations in the COL2A1, COL11A1, COL11A2, COL9A1 procollagen genes of type 2 and 11 collagen. Patients with a mandibular hypoplasia like Stickler syndrome present the anesthesiologist with considerable problems when mask ventilation or endotracheal intubation is attempted. We report a successful anesthetic experience, including blind endotracheal intubation with rigid laryngoscope without neuromuscular blockade, in a 9-year-old boy with Stickler syndrome for scleral buckling with cryotherapy.

A Case of Stickler Syndrome Type I Caused by a Novel Variant of COL2A1 Gene

Stickler syndrome is a very rare connective tissue disorder. The authors of the present study describe an 11-month-old girl with high myopia, retinal abnormalities, flat nose, cleft palate, retrognathia, micrognathia, short stature and arthrogryposis. Radiological evaluation also showed irregularity of the epiphysis of the femur and tibia and spondyloepiphyseal dysplasia. Genetic analysis using a peripheral blood sample revealed a novel variant c.787G>A (p.Gly246Asp) mutation of the COL2A1 gene. This is the first Korean case with Stickler syndrome confirmed by genetic testing.

Síndrome de Stickler: aspectos gerais / Stickler syndrome: general aspects

A síndrome de Stickler é a principal causa de descolamento de retina entre os fatores hereditários, sendo ainda pouco conhecida, apesar de comum na Europa. Constitui-se em doença autossômica dominante, progressiva, causada a partir de mutações em genes responsáveis pela síntese de colágeno, como COL2A1, COL11A1 e COL11A2. Possui variada sintomatologia, inclusive dentro de uma mesma família. Ocorrem alterações otorrinolaringológicas, oftalmológicas, ortopédicas e sistêmicas, como hipoacusia, fenda palatina, face plana, nariz achatado, miopia intensa, catarata, glaucoma, articulações hiperflexíveis e prolapso da valva mitral. Dentre as principais complicações dos indivíduos afetados se encontram surdez neurossensorial, descolamento da retina e cegueira. O artigo se constituiu em uma revisão bibliográfica sobre a síndrome de Stickler, abordando os principais sinais e sintomas clínicos, diagnóstico e tratamento, através da pesquisa e seleção de artigos científicos na biblioteca virtual BIREME, predominantemente de 2000 a 2006, associados a artigos clássicos sobre o tema. Devido a seu caráter progressivo, torna-se fundamental o diagnóstico precoce, na tentativa de evitar complicações que prejudiquem o desenvolvimento do indivíduo, havendo necessidade de tratamento multidisciplinar, devido ao acometimento de múltiplas estruturas.

Stickler's Syndrome

Stickler's syndrome is a progressive, hereditary disorder with ocular and systemic features. Ocular findings are vitreous veil or vitreous strand due to vitreous condensation, vitreoretinal degeneration, moderate to severe myopia, vitreous liquefaction, chorioretinal atrophy, retinal detachment and cataract. Systemic findings are midfacial hypoplasia, cleft palate, hearing loss, musculoskeletal abnormalities. The authors experienced 3 cases of stickler's syndrome in three brothers of one family.