scholarly journals Case Report: A Novel Compound Heterozygous Mutation of the FRMD4A Gene Identified in a Chinese Family With Global Developmental Delay, Intellectual Disability, and Ataxia

2021 ◽  
Vol 9 ◽  
Author(s):  
Yuhua Pan ◽  
Xiaoling Guo ◽  
Xiaoqiang Zhou ◽  
Yue Liu ◽  
Jingli Lian ◽  
...  
Keyword(s):  
Developmental Delay ◽  
Intellectual Development ◽  
Scaffolding Protein ◽  
Compound Heterozygous Mutation ◽  
Global Developmental Delay ◽  
Chinese Family ◽  
Heterozygous Mutation ◽  
Compound Heterozygous ◽  
Missense Mutations ◽  
Sequencing Data

Background: FERM domain-containing protein 4A (FRMD4A) is a scaffolding protein previously proposed to be critical in the regulation of cell polarity in neurons and implicated in human intellectual development.Case Presentation: We report a case of a 3-year-old boy with corpus callosum anomaly, relative macrocephaly, ataxia, and unexplained global developmental delay. Here, compound heterozygous missense mutations in the FRMD4A gene [c.1830G>A, p.(Met610Ile) and c.2973G>C, p.(Gln991His)] were identified in the proband, and subsequent familial segregation showed that each parent had transmitted a mutation.Conclusions: Our results have confirmed the associations of mutations in the FRMD4A gene with intellectual development and indicated that for patients with unexplained global developmental delay, the FRMD4A gene should be included in the analysis of whole exome sequencing data, which can contribute to the identification of more patients affected by this severe phenotypic spectrum.

scholarly journals A novel compound heterozygous mutation in the GJB2 gene is associated with non-syndromic hearing loss in a Chinese family

2018 ◽  
Vol 12 (5) ◽  
pp. 470-475 ◽  
Author(s):  
Haiou Jiang ◽  
Youya Niu ◽  
Lingfeng Qu ◽  
Xueshuang Huang ◽  
Xinlong Zhu ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Compound Heterozygous Mutation ◽  
Chinese Family ◽  
Heterozygous Mutation ◽  
Compound Heterozygous ◽  
Syndromic Hearing Loss ◽  
I Gene

scholarly journals Spectrum of clinical manifestation of methylmalonic acidemia and homocystinuria in a family of six siblings: novel combination of transcobalamin receptor defect (CD320) and cblC deficiency (MMACHC)

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Nadia Waheed ◽  
Zafar Fayyaz ◽  
Ahmad Imran
Keyword(s):  
Age Of Onset ◽  
Megaloblastic Anemia ◽  
Visual Disturbance ◽  
Methylmalonic Acidemia ◽  
Response To Treatment ◽  
Compound Heterozygous Mutation ◽  
Global Developmental Delay ◽  
Heterozygous Mutation ◽  
Compound Heterozygous ◽  
Vascular Events

Abstract Background Methylmalonic acidemia with homocystinuria is caused by a rare inborn error of vitamin B12 (cobalamin) metabolism. There are four complementation classes of cobalamin defects cblC, cblD, cblF, and cblJ that are responsible for combined methylmalonic acidemia and homocystinuria. Case presentation We report a case of a Pakistani family composed of six children diagnosed with methylmalonic acidemia and homocystinuria (MMA + HCU). Mutation analysis of siblings revealed a variable combination of c.394C>T mutation in the MMACHC gene and c.262_264del in CD320 gene. All siblings had variable age of onset, initial symptomatology, the severity of disease, and response to treatment. The maximum age of presentation was 6.5 years and the minimum age was at birth. The spectrum of symptoms ranged from a subtle learning disability to global developmental delay within the same family. None of them had a seizure disorder, megaloblastic anemia, visual disturbance, and vascular events.CD320 defect itself is very rare, and only 12 cases have been reported so far. We report six cases, four of them had homozygous MMACHC variant c.394C>T and the other two had heterozygous MMACHC mutations in c.394C>T and c.262_264del in CD 320 genes. To date, neither such case has been reported in the literature or this compound heterozygous mutation. Conclusion Our case report emphasizes that the diagnosis of inherited metabolic disorder in a child obviates the need to screen all siblings for the same disorder.

scholarly journals Genetic, Prenatal, and Preimplantation Genetic Diagnosis of Glutaric Aciduria Type I

2021 ◽  
Vol 3 (1) ◽  
pp. 397-404
Author(s):  
He B ◽  
Wang L ◽  
Wu Q ◽  
Song C ◽  
Li W ◽  
...  
Keyword(s):  
Sanger Sequencing ◽  
Treatment Guidelines ◽  
Genetic Diagnosis ◽  
Monogenic Disease ◽  
Compound Heterozygous Mutation ◽  
Chinese Family ◽  
Heterozygous Mutation ◽  
Compound Heterozygous ◽  
Type I ◽  
Preimplantation Genetic Testing

Purpose: Glutaric Acid Type I (GA-I) is an inherited metabolic disorder. Although the treatment guidelines for GA-I were established a decade ago, they cannot block the vertical heredity. We aim to apply genetic methods to block the inheritance of GA-I and verifies the efficiency of Next-Generation Sequencing (NGS)-based Preimplantation Genetic Testing for Monogenic disease (PGT-M) of GA-I.Materials and methods: A non-consanguineous Chinese family was diagnosed with GA-I by Sanger sequencing. PGT-M and prenatal diagnosis (PND) were performed for the carrier. 5 blastocysts were used for the trophectoderm biopsy. After Whole-Genome Amplification (WGA), the WGA products were used for Sanger sequencing, NGS-based PGT-M and PGT-A. Sanger sequencing-based PND was performed in second trimester to confirm the results of PGT-M.Results: A compound heterozygous mutation was diagnosed in the GCDH gene with co-segregation. One is [c.533G>A (p.G178E)] and another is [c.914C>T (p.S305L)]. 2 blastocysts were diagnosed as normal and one of them was transferred into the mother’s uterus. Finally, a healthy female was born 39 weeks after transplantation.Conclusion: Our study successfully applied NGS-based PGT-M to avoid GA-I and highlights the efficiency of genetic diagnoses. It has significant implications on genetic counseling and genetic diagnosis for GA-I.

scholarly journals Novel compound heterozygous mutation in the CNGA1 gene underlie autosomal recessive retinitis pigmentosa in a Chinese family

2016 ◽  
Vol 36 (1) ◽  
Author(s):  
Xin Jin ◽  
Ling-Hui Qu ◽  
Bao-Ke Hou ◽  
Hai-Wei Xu ◽  
Xiao-Hong Meng ◽  
...  
Keyword(s):  
Retinitis Pigmentosa ◽  
Autosomal Recessive ◽  
Protein Product ◽  
Compound Heterozygous Mutation ◽  
Chinese Family ◽  
Heterozygous Mutation ◽  
Compound Heterozygous ◽  
Rod Photoreceptors ◽  
Gene Coding ◽  
Compound Mutation

A novel compound mutation in CNGA1 gene, coding for the cGMP-gated ion channel protein, results in a protein product that is not targeted to the plasma membrane, which would be deleterious to rod photoreceptors leading to retinitis pigmentosa (RP).

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