scholarly journals Type I interferonopathies with novel compound heterozygous TREX1 mutations in two siblings with different symptoms responded to tofacitinib

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Shiyu Zhang ◽  
Jiaxing Song ◽  
Yuyan Yang ◽  
Huilei Miao ◽  
Lu Yang ◽  
...  
Keyword(s):  
Mutation Screening ◽  
Missense Variant ◽  
Skin Lesions ◽  
Chinese Family ◽  
Compound Heterozygous ◽  
Therapeutic Effects ◽  
Type I ◽  
Her Family ◽  
Compound Heterozygous Variants ◽  
Type I Interferonopathies

Abstract Background Type I interferonopathies are a group of rare autoimmune diseases characterised by excessive activation of type I interferon that leads to disturbances in immune function. Three prime repair exonuclease 1 (TREX1) is an important exonuclease and plays an important role in DNA damage repair. TREX1 mutations are associated with many type I interferonopathies. Studies have been published on the effectiveness of tofacitinib in the treatment of type I interferonopathies. The aim of this study is to identify the pathogenic variation in a Chinese family with type I interferonopathies and to observe the therapeutic effects of tofacitinib. Methods A Chinese family with two members with type I interferonopathies was investigated. Whole exome sequencing and Sanger sequencing were applied for mutation screening using peripheral blood DNA of the patient and her family members. Sequencing results were analysed using bioinformatics software tools including VarCards and PolyPhen-2. Close clinical follow-up and observation were used to record changes in the disease before and after treatment with tofacitinib. Results Compound heterozygous variants of TREX1 were observed in the patient’s genome. One was a missense variant (NM_016381; c.C227T; p.Ala76Val) from the patient’s father, and the other was a frameshift variant (NM_016381; c.458dupA; p.Gln153Glnfs*3) from the patient’s mother. One of the proband’s elder brothers with similar skin lesions also carried these two variants. This brother of the proband had more serious cutaneous involvement with the comorbidity of cerebral palsy. These TREX1 variants have not been reported in previous studies and are predicted to be highly pathogenic. The proband was given tofacitinib that led to a marked improvement. Conclusions We identified two novel complex heterozygous variants in the TREX1 gene, which may underlie the molecular pathogenesis of the type I interferonopathies observed in members of this family. Tofacitinib could be an alternative treatment for this disease.

scholarly journals Novel compound heterozygous EYS variants may be associated with arRP in a large Chinese pedigree

2020 ◽  
Vol 40 (6) ◽  
Author(s):  
Chunli Wei ◽  
Ting Xiao ◽  
Jingliang Cheng ◽  
Jiewen Fu ◽  
Qi Zhou ◽  
...  
Keyword(s):  
Novel Mutation ◽  
Gene Mutations ◽  
Chinese Family ◽  
Compound Heterozygous ◽  
Missense Mutations ◽  
The Novel ◽  
Pathogenic Variants ◽  
Pathogenic Genes ◽  
Compound Heterozygous Variants ◽  
Normal Controls

Abstract As a genetically heterogeneous ocular dystrophy, gene mutations with autosomal recessive retinitis pigmentosa (arRP) in patients have not been well described. We aimed to detect the disease-causing genes and variants in a Chinese arRP family. In the present study, a large Chinese pedigree consisting of 31 members including a proband and another two patients was recruited; clinical examinations were conducted; next-generation sequencing using a gene panel was used for identifying pathogenic genes, and Sanger sequencing was performed for verification of mutations. Novel compound heterozygous variants c.G2504A (p.C835Y) and c.G6557A (p.G2186E) for the EYS gene were identified, which co-segregated with the clinical RP phenotypes. Sequencing of 100 ethnically matched normal controls didn’t found these mutations in EYS. Therefore, our study identified pathogenic variants in EYS that may cause arRP in this Chinese family. This is the first study to reveal the novel mutation in the EYS gene (c.G2504A, p.C835Y), extending its mutation spectrum. Thus, the EYS c.G2504A (p.C835Y) and c.G6557A (p.G2186E) variants may be the disease-causing missense mutations for RP in this large arRP family. These findings should be helpful for molecular diagnosis, genetic counseling and clinical management of arRP disease.

scholarly journals Novel MFSD8 Variants in a Chinese Family with Nonsyndromic Macular Dystrophy

2021 ◽  
Vol 2021 ◽  
pp. 1-5
Author(s):  
Qin Xiang ◽  
Yanna Cao ◽  
Hongbo Xu ◽  
Zhijian Yang ◽  
Liang Tang ◽  
...  
Keyword(s):  
Family Members ◽  
Major Facilitator Superfamily ◽  
Chinese Family ◽  
Macular Dystrophy ◽  
Compound Heterozygous ◽  
The Novel ◽  
Pathogenic Variants ◽  
Compound Heterozygous Variants ◽  
Major Facilitator ◽  
Mfsd8 Gene

Purpose. To identify the molecular etiology of a Chinese family with nonsyndromic macular dystrophy. Methods. Ophthalmic examinations were performed, and genomic DNA was extracted from available family members. Whole exome sequencing of two members (the proband and her unaffected mother) and Sanger sequencing in available family members were performed to screen potential pathogenic variants. Results. Novel compound heterozygous variants, c.1066C>T (p.Pro356Ser) and c.1102+2T>C, in the major facilitator superfamily domain containing 8 gene (MFSD8) were suspected to be involved in this family’s macular dystrophy phenotype. The novel c.1066C>T variant in the MFSD8 gene probably resulted in substitution of serine for proline at the 356th residue and was predicted to be “uncertain significance” through in silico analyses. The novel c.1102+2T>C variant in the MFSD8 gene was likely to affect the splicing form and predicted to be “pathogenic.” Conclusion. The novel compound heterozygous variants, c.1066C>T (p.Pro356Ser) and c.1102+2T>C, in the MFSD8 gene are likely responsible for the isolated macular dystrophy phenotype in this family. This study enlarged the MFSD8 gene mutant spectrum and might provide more accurate genetic counseling for this family.

scholarly journals Compound heterozygous inheritance of two novel COQ2 variants results in familial coenzyme Q deficiency

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Aliaa H. Abdelhakim ◽  
Avinash V. Dharmadhikari ◽  
Sara D. Ragi ◽  
Jose Ronaldo Lima de Carvalho ◽  
Christine L. Xu ◽  
...  
Keyword(s):  
Coenzyme Q ◽  
Clinical Manifestations ◽  
Missense Variant ◽  
Neurological Involvement ◽  
Cone Dystrophy ◽  
Compound Heterozygous ◽  
Pathogenic Variants ◽  
Whole Exome ◽  
Compound Heterozygous Variants ◽  
End Stage

Abstract Background Primary coenzyme Q10 deficiency is a rare disease that results in diverse and variable clinical manifestations. Nephropathy, myopathy and neurologic involvement are commonly associated, however retinopathy has also been observed with certain pathogenic variants of genes in the coenzyme Q biosynthesis pathway. In this report, we describe a novel presentation of the disease that includes nephropathy and retinopathy without neurological involvement, and which is the result of a compound heterozygous state arising from the inheritance of two recessive potentially pathogenic variants, previously not described. Materials and methods Retrospective report, with complete ophthalmic examination, multimodal imaging, electroretinography, and whole exome sequencing performed on a family with three affected siblings. Results We show that affected individuals in the described family inherited two heterozygous variants of the COQ2 gene, resulting in a frameshift variant in one allele, and a predicted deleterious missense variant in the second allele (c.288dupC,p.(Ala97Argfs*56) and c.376C > G,p.(Arg126Gly) respectively). Electroretinography results were consistent with rod-cone dystrophy in the affected individuals. All affected individuals in the family exhibited the characteristic retinopathy as well as end-stage nephropathy, without evidence of any neurological involvement. Conclusions We identified two novel compound heterozygous variants of the COQ2 gene that result in primary coenzyme Q deficiency. Targeted sequencing of coenzyme Q biosynthetic pathway genes may be useful in diagnosing oculorenal clinical presentations syndromes not explained by more well known syndromes (e.g., Senior-Loken and Bardet-Biedl syndromes).

scholarly journals DNAH11 compound heterozygous variants cause heterotaxy and congenital heart disease

PLoS ONE ◽  
2021 ◽  
Vol 16 (6) ◽  
pp. e0252786
Author(s):  
Hong Xia ◽  
Xiangjun Huang ◽  
Sheng Deng ◽  
Hongbo Xu ◽  
Yan Yang ◽  
...  
Keyword(s):  
Congenital Heart Disease ◽  
Heart Disease ◽  
Exome Sequencing ◽  
Sanger Sequencing ◽  
Congenital Heart ◽  
Chinese Family ◽  
Compound Heterozygous ◽  
Internal Organs ◽  
Pathogenic Variants ◽  
Compound Heterozygous Variants

Heterotaxy (HTX), a condition characterized by internal organs not being arranged as expected relative to each other and to the left-right axis, is often accompanied with congenital heart disease (CHD). The purpose was to detect the pathogenic variants in a Chinese family with HTX and CHD. A non-consanguineous Han Chinese family with HTX and CHD, and 200 unrelated healthy subjects were enlisted. Exome sequencing and Sanger sequencing were applied to identify the genetic basis of the HTX family. Compound heterozygous variants, c.3426-1G>A and c.4306C>T (p.(Arg1436Trp)), in the dynein axonemal heavy chain 11 gene (DNAH11) were identified in the proband via exome sequencing and further confirmed by Sanger sequencing. Neither c.3426-1G>A nor c.4306C>T variant in the DNAH11 gene was detected in 200 healthy controls. The DNAH11 c.3426-1G>A variant was predicted as altering the acceptor splice site and most likely affecting splicing. The DNAH11 c.4306C>T variant was predicted to be damaging, which may reduce the phenotype severity. The compound heterozygous variants, c.3426-1G>A and c.4306C>T, in the DNAH11 gene might be the pathogenic alterations resulting in HTX and CHD in this family. These findings broaden the variant spectrum of the DNAH11 gene and increase knowledge used in genetic counseling for the HTX family.

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 PRPF3-Associated Autosomal Dominant Retinitis Pigmentosa and CYP4V2-Associated Bietti’s Crystalline Corneoretinal Dystrophy Coexist in a Multigenerational Chinese Family

2017 ◽  
Vol 2017 ◽  
pp. 1-10
Author(s):  
Xiaohong Meng ◽  
Qiyou Li ◽  
Hong Guo ◽  
Haiwei Xu ◽  
Shiying Li ◽  
...  
Keyword(s):  
Missense Mutation ◽  
Clinical Features ◽  
Sanger Sequencing ◽  
Mutation Screening ◽  
Retinal Dystrophy ◽  
Family Members ◽  
Large Family ◽  
Chinese Family ◽  
Compound Heterozygous ◽  
Genetic Characteristics

Purpose. To characterize the clinical and molecular genetic characteristics of a large, multigenerational Chinese family showing different phenotypes. Methods. A pedigree consisted of 56 individuals in 5 generations was recruited. Comprehensive ophthalmic examinations were performed in 16 family members affected. Mutation screening of CYP4V2 was performed by Sanger sequencing. Next-generation sequencing (NGS) was performed to capture and sequence all exons of 47 known retinal dystrophy-associated genes in two affected family members who had no mutations in CYP4V2. The detected variants in NGS were validated by Sanger sequencing in the family members. Results. Two compound heterozygous CYP4V2 mutations (c.802-8_810del17insGC and c.992A>C) were detected in the proband who presented typical clinical features of BCD. One missense mutation (c.1482C>T, p.T494M) in the PRPF3 gene was detected in 9 out of 22 affected family members who manifested classical clinical features of RP. Conclusions. Our results showed that two compound heterozygous CYP4V2 mutations caused BCD, and one missense mutation in PRPF3 was responsible for adRP in this large family. This study suggests that accurate phenotypic diagnosis, molecular diagnosis, and genetic counseling are necessary for patients with hereditary retinal degeneration in some large mutigenerational family.

scholarly journals Two Decades after Mandibuloacral Dysplasia Discovery: Additional Cases and Comprehensive View of Disease Characteristics

Genes ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1508
Author(s):  
Isabelle Jéru ◽  
Amira Nabil ◽  
Gehad El-Makkawy ◽  
Olivier Lascols ◽  
Corinne Vigouroux ◽  
...  
Keyword(s):  
Phenotypic Variability ◽  
Genetic Disorders ◽  
Autosomal Recessive Disorder ◽  
Missense Variant ◽  
Compound Heterozygous ◽  
Partial Lipodystrophy ◽  
Mandibular Hypoplasia ◽  
Pathogenic Variants ◽  
Compound Heterozygous Variants ◽  
Mandibuloacral Dysplasia

Pathogenic variants in the LMNA gene cause a group of heterogeneous genetic disorders, called laminopathies. In particular, homozygous or compound heterozygous variants in LMNA have been associated with “mandibuloacral dysplasia type A” (MADA), an autosomal recessive disorder, characterized by mandibular hypoplasia, growth retardation mainly postnatal, pigmentary skin changes, progressive osteolysis of the distal phalanges and/or clavicles, and partial lipodystrophy. The detailed characteristics of this multisystemic disease have yet to be specified due to its rarity and the limited number of cases described. Here, we report three unrelated Egyptian patients with variable severity of MAD features. Next-generation sequencing using a gene panel revealed a homozygous c.1580G>A-p.Arg527His missense variant in LMNA exon 9 in an affected individual with a typical MADA phenotype. Another homozygous c.1580G>T-p.Arg527Leu variant affecting the same amino acid was identified in two additional patients, who both presented with severe manifestations very early in life. We combined our observations together with data from all MADA cases reported in the literature to get a clearer picture of the phenotypic variability in this disease. This work raises the number of reported MADA families, argues for the presence of the founder effect in Egypt, and strengthens genotype–phenotype correlations.

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