scholarly journals New Compound Heterozygous CYP4V2 Mutations in Bietti Crystalline Corneoretinal Dystrophy

2020 ◽  
Author(s):  
Ting Wang ◽  
Qingshan Chen ◽  
Longhao Kuang ◽  
Jiantao Wang ◽  
Xiaohe Yan
Keyword(s):  
Autosomal Recessive ◽  
Frameshift Mutation ◽  
Retinal Dystrophy ◽  
Genetic Diagnosis ◽  
Compound Heterozygous ◽  
Retinal Diseases ◽  
Sequence Capture ◽  
Pathogenic Genes ◽  
Compound Heterozygous Mutations ◽  
Targeted Sequence Capture

Abstract Background: Bietti crystalline corneoretinal dystrophy (BCD) is an autosomal recessive retinal dystrophy which is caused by the mutations of CYP4V2.Here we identified new CYP4V2compound heterozygous mutations in BCD.Methods:381 pathogenic genes related to retinal diseases were screened by targeted sequence capture array techniques and confirmed by Sanger sequencing.Results:Two female siblings with BCD carry two compound heterozygous mutations in CYP4V2. One was missense mutation c.1198C>T (p.R400C) and the other was frameshift mutation c.802-8_810delinsGC (p.V268_E329del).Optical coherence tomography (OCT) showed that the ellipsoid zone was absent in the macular regions and electroretinogram (ERG) revealed poor cone and rod responses. Conclusions:Newcompound heterozygous mutations in CYP4V2 are related to the BCD.Our study expands our knowledge of heterogenic phenotypes and genotypes through genetic diagnosis of the BCD patients.

Expanding the phenotype of SLC12A6-associated sensorimotor neuropathy

2021 ◽  
Vol 14 (10) ◽  
pp. e244641
Author(s):  
Petya Bogdanova-Mihaylova ◽  
Patricia McNamara ◽  
Sarah Burton-Jones ◽  
Sinéad M Murphy
Keyword(s):  
Corpus Callosum ◽  
Autosomal Recessive ◽  
Sensory Neuropathy ◽  
Rare Condition ◽  
Compound Heterozygous ◽  
Sensorimotor Neuropathy ◽  
Autosomal Recessive Condition ◽  
Solute Carrier ◽  
Compound Heterozygous Mutations ◽  
Clinical Phenotyping

Hereditary motor and sensory neuropathy with agenesis of the corpus callosum (HMSN/ACC) is a rare autosomal recessive condition characterised by early-onset severe progressive neuropathy, variable degrees of ACC and cognitive impairment. Mutations in SLC12A6 (solute carrier family 12, member 6) encoding the K+–Cl- transporter KCC3 have been identified as the genetic cause of HMSN/ACC. We describe fraternal twins with compound heterozygous mutations in SLC12A6 and much milder phenotype than usually described. Neither of our patients requires assistance to walk. The female twin is still running and has a normal intellect. Charcot-Marie-Tooth Examination Score 2 was 8/28 in the brother and 5/28 in the sister. Neurophysiology demonstrated a length-dependent sensorimotor neuropathy. MRI brain showed normal corpus callosum. Genetic analysis revealed compound heterozygous mutations in SLC12A6, including a whole gene deletion. These cases expand the clinical and genetic phenotype of this rare condition and highlight the importance of careful clinical phenotyping.

scholarly journals Novel Compound Heterozygous Mutations in CRTAP Cause Rare Autosomal Recessive Osteogenesis Imperfecta

2020 ◽  
Vol 11 ◽  
Author(s):  
Yen-An Tang ◽  
Lin-Yen Wang ◽  
Chiao-May Chang ◽  
I-Wen Lee ◽  
Wen-Hui Tsai ◽  
...  
Keyword(s):  
Osteogenesis Imperfecta ◽  
Autosomal Recessive ◽  
Compound Heterozygous ◽  
Compound Heterozygous Mutations

scholarly journals Compound Heterozygous Mutations in TMC1 and MYO15A Are Associated with Autosomal Recessive Nonsyndromic Hearing Loss in Two Chinese Han Families

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Pengcheng Xu ◽  
Jun Xu ◽  
Hu Peng ◽  
Tao Yang
Keyword(s):  
Hearing Loss ◽  
Next Generation Sequencing ◽  
Genetic Diagnosis ◽  
Compound Heterozygous ◽  
Next Generation ◽  
Chinese Han ◽  
Targeted Next Generation Sequencing ◽  
Recessive Mutations ◽  
Compound Heterozygous Mutations ◽  
Generation Sequencing

Genetic hearing loss is a common sensory disorder, and its cause is highly heterogeneous. In this study, by targeted next-generation sequencing of 414 known deafness genes, we identified compound heterozygous mutations p.R34X/p.M413T in TMC1 and p.S3417del/p.R1407T in MYO15A in two recessive Chinese Han deaf families. Intrafamilial cosegregation of the mutations with the hearing phenotype was confirmed in both families by the Sanger sequencing. Auditory features of the affected individuals are consistent with that previously reported for recessive mutations in TMC1 and MYO15A. The two novel mutations identified in this study, p.M413T in TMC1 and p.R1407T in MYO15A, are classified as likely pathogenic according to the guidelines of ACMG. Our study expanded the mutation spectrums of TMC1 and MYO15A and illustrated that genotype-phenotype correlation in combination with next-generation sequencing may improve the accuracy for genetic diagnosis of deafness.

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