scholarly journals Meta-Analysis of Mutations in ALOX12B or ALOXE3 Identified in a Large Cohort of 224 Patients

Genes ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 80
Author(s):  
Alrun Hotz ◽  
Julia Kopp ◽  
Emmanuelle Bourrat ◽  
Vinzenz Oji ◽  
Katalin Komlosi ◽  
...  
Keyword(s):  
Autosomal Recessive ◽  
Meta Analysis ◽  
Large Cohort ◽  
Epidermal Differentiation ◽  
Novel Mutations ◽  
Pathogenic Mutations ◽  
Recurrent Mutations ◽  
Harlequin Ichthyosis ◽  
12 Lipoxygenase ◽  
Congenital Ichthyosiform Erythroderma

The autosomal recessive congenital ichthyoses (ARCI) are a nonsyndromic group of cornification disorders that includes lamellar ichthyosis, congenital ichthyosiform erythroderma, and harlequin ichthyosis. To date mutations in ten genes have been identified to cause ARCI: TGM1, ALOX12B, ALOXE3, NIPAL4, CYP4F22, ABCA12, PNPLA1, CERS3, SDR9C7, and SULT2B1. The main focus of this report is the mutational spectrum of the genes ALOX12B and ALOXE3, which encode the epidermal lipoxygenases arachidonate 12-lipoxygenase, i.e., 12R type (12R-LOX), and the epidermis-type lipoxygenase-3 (eLOX3), respectively. Deficiency of 12R-LOX and eLOX3 disrupts the epidermal barrier function and leads to an abnormal epidermal differentiation. The type and the position of the mutations may influence the ARCI phenotype; most patients present with a mild erythrodermic ichthyosis, and only few individuals show severe erythroderma. To date, 88 pathogenic mutations in ALOX12B and 27 pathogenic mutations in ALOXE3 have been reported in the literature. Here, we presented a large cohort of 224 genetically characterized ARCI patients who carried mutations in these genes. We added 74 novel mutations in ALOX12B and 25 novel mutations in ALOXE3. We investigated the spectrum of mutations in ALOX12B and ALOXE3 in our cohort and additionally in the published mutations, the distribution of these mutations within the gene and gene domains, and potential hotspots and recurrent mutations.

scholarly journals Novel Mutations and Mutation Combinations ofTMPRSS3Cause Various Phenotypes in One Chinese Family with Autosomal Recessive Hearing Impairment

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Xue Gao ◽  
Yong-Yi Yuan ◽  
Guo-Jian Wang ◽  
Jin-Cao Xu ◽  
Yu Su ◽  
...  
Keyword(s):  
Hearing Impairment ◽  
Autosomal Recessive ◽  
Novel Mutation ◽  
Chinese Family ◽  
Compound Heterozygous ◽  
Novel Mutations ◽  
Pathogenic Mutations ◽  
Compound Heterozygous Mutations

Autosomal recessive hearing impairment with postlingual onset is rare. Exceptions are caused by mutations in theTMPRSS3gene, which can lead to prelingual (DFNB10) as well as postlingual deafness (DFNB8).TMPRSS3mutations can be classified as mild or severe, and the phenotype is dependent on the combination ofTMPRSS3mutations. The combination of two severe mutations leads to profound hearing impairment with a prelingual onset, whereas severe mutations in combination with milderTMPRSS3mutations lead to a milder phenotype with postlingual onset. We characterized a Chinese family (number FH1523) with not only prelingual but also postlingual hearing impairment. Three mutations inTMPRSS3, one novel mutation c.36delC [p.(Phe13Serfs⁎12)], and two previously reported pathogenic mutations, c.916G>A (p.Ala306Thr) and c.316C>T (p.Arg106Cys), were identified. Compound heterozygous mutations of p.(Phe13Serfs⁎12) and p.Ala306Thr manifest as prelingual, profound hearing impairment in the patient (IV: 1), whereas the combination of p.Arg106Cys and p.Ala306Thr manifests as postlingual, milder hearing impairment in the patient (II: 2, II: 3, II: 5), suggesting that p.Arg106Cys mutation has a milder effect than p.(Phe13Serfs⁎12). We concluded that different combinations ofTMPRSS3mutations led to different hearing impairment phenotypes (DFNB8/DFNB10) in this family.

scholarly journals Evaluation of the Genetic Variation Spectrum Related to Corneal Dystrophy in a Large Cohort

2021 ◽  
Vol 9 ◽  
Author(s):  
Wei Li ◽  
Ning Qu ◽  
Jian-Kang Li ◽  
Yu-Xin Li ◽  
Dong-Ming Han ◽  
...  
Keyword(s):  
Transforming Growth Factor Beta ◽  
Transforming Growth Factor ◽  
Eye Diseases ◽  
Large Cohort ◽  
Missense Mutations ◽  
High Quality ◽  
Specific Level ◽  
Ethnic Chinese ◽  
Pathogenic Mutations ◽  
Recurrent Mutations

AimsTo characterize the genetic landscape and mutation spectrum of patients with corneal dystrophies (CDs) in a large Han ethnic Chinese Cohort with inherited eye diseases (IEDs).MethodsRetrospective study. A large IED cohort was recruited in this study, including 69 clinically diagnosed CD patients, as well as other types of eye diseases patients and healthy family members as controls. The 792 genes on the Target_Eye_792_V2 chip were used to screen all common IEDs in our studies, including 22 CD-related genes.ResultsWe identified 2334 distinct high-quality variants on 22 CD-related genes in a large IEDs cohort. A total of 21 distinct pathogenic or likely pathogenic mutations were identified, and the remaining 2313 variants in our IED cohort had no evidence of CD-related pathogenicity. Overall, 81.16% (n = 56/69) of CD patients received definite molecular diagnoses, and transforming growth factor-beta-induced protein (TGFBI), CHTS6, and SLC4A11 genes covered 91.07, 7.14, and 1.79% of the diagnosed cases, respectively. Twelve distinct disease-associated mutations in the TGFBI gene were identified, 11 of which were previously reported and one is novel. Four of these TGFBI mutations (p.D123H, p.M502V, p.P501T, and p.P501A) were redefined as likely benign in our Han ethnic Chinese IED cohort after performing clinical variant interpretation. These four TGFBI mutations were detected in asymptomatic individuals but not in CD patients, especially the previously reported disease-causing mutation p.P501T. Among 56 CD patients with positive detected mutations, the recurrent TGFBI mutations were p.R124H, p.R555W, p.R124C, p.R555Q, and p.R124L, and the proportions were 32.14, 19.64, 14.29, 10.71, and 3.57%, respectively. Twelve distinct pathogenic or likely pathogenic mutations of CHTS6 were detected in 28 individuals. The recurrent mutations were p.Y358H, p.R140X, and p.R205W, and the proportions were 25.00, 21.43, and 14.29%, respectively. All individuals associated with TGFBI were missense mutations; 74.19% associated with CHTS6 mutations were missense mutations, and 25.81% were non-sense mutations. Hot regions were located in exons 4 and 12 of TGFBI individuals and located in exon 3 of CHTS6 individuals. No de novo mutations were identified.ConclusionFor the first time, our large cohort study systematically described the variation spectrum of 22 CD-related genes and evaluated the frequency and pathogenicity of all 2334 distinct high-quality variants in our IED cohort. Our research will provide East Asia and other populations with baseline data from a Han ethnic population-specific level.

Two novel mutations in TMEM38B result in rare autosomal recessive osteogenesis imperfecta

2016 ◽  
Vol 61 (6) ◽  
pp. 539-545 ◽  
Author(s):  
Fang Lv ◽  
Xiao-jie Xu ◽  
Jian-yi Wang ◽  
Yi Liu ◽  
Asan ◽  
...  
Keyword(s):  
Osteogenesis Imperfecta ◽  
Autosomal Recessive ◽  
Novel Mutations

THE ICHTHYOSIFORM DERMATOSES

PEDIATRICS ◽  
1968 ◽  
Vol 42 (6) ◽  
pp. 990-1004
Author(s):  
Nancy B. Esterly
Keyword(s):  
Autosomal Recessive ◽  
Autosomal Dominant ◽  
Clinical Investigation ◽  
Correct Diagnosis ◽  
Associated Anomalies ◽  
Dominant Trait ◽  
Autosomal Dominant Trait ◽  
Clinical Variants ◽  
Congenital Ichthyosiform Erythroderma ◽  
Mode Of Inheritance

The Term ichthyosis describes a group of heritable disorders which are characterized by cutaneous scaling. The visible scale differentiates these disorders from xeroderma in which the skin is dry but does not visibly desquamate. Many classifications of the ichthyoses have been proposed, but most are descriptive and contribute little to an understanding of etiology and pathogenesis. Often clinical variants or patients with minor associated anomalies have been categorized separately on an empirical basis and, in some cases, several names have been used for one entity to indicate severity of involvement. The most useful classification appears to be that of Wells and Kerr,1 who segregated the various types by their pattern of inheritance and retained the nomenclature in common usage. Differences in clinical features and histologic patterns also correlate with these genetically distinguishable types. Thus, with careful attention to the distribution and type of scale, family history, and skin histology, the physician will be able to classify patients in a meaningful way. Such an approach is helpful for several reasons. The prognosis, troublesome features, and degree of handicapping differ for the various ichthyoses. Sensible genetic counseling, an important part of the management of such patients, is possible only with the correct diagnosis. Moreover, clinical investigation of affected individuals will be further confused unless the entity under study is well defined. The need for an understanding of the physiologic and biochemical defects of ichthvotic skin is underscored by the limitations of currently available therapy. The four major types of ichthyosis include: (1) ichthyosis vulgaris, transmitted as an autosomal dominant trait; (2) sexlinked ichthyosis, transmitted as an Xlinked trait; (3) bullous congenital ichthyosiform erythroderma (CIE), inherited as an autosomal dominant trait; and (4) nonbulbus congenital ichthyosiform erythroderma, autosomal recessive mode of inheritance (Table I).

scholarly journals Targeted Next-Generation Sequencing of a Deafness Gene Panel (MiamiOtoGenes) Analysis in Families Unsuitable for Linkage Analysis

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Haiqiong Shang ◽  
Denise Yan ◽  
Naeimeh Tayebi ◽  
Kolsoum Saeidi ◽  
Afsaneh Sahebalzamani ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Linkage Analysis ◽  
Autosomal Recessive ◽  
Target Sequence ◽  
Novel Mutations ◽  
Nonsyndromic Deafness ◽  
Targeted Next Generation Sequencing ◽  
Deafness Gene ◽  
Comprehensive Diagnosis ◽  
Generation Sequencing

Hearing loss (HL) is a common sensory disorder in humans with high genetic heterogeneity. To date, over 145 loci have been identified to cause nonsyndromic deafness. Furthermore, there are countless families unsuitable for the conventional linkage analysis. In the present study, we used a custom capture panel (MiamiOtoGenes) to target sequence 180 deafness-associated genes in 5 GJB2 negative deaf probands with autosomal recessive nonsyndromic HL from Iran. In these 5 families, we detected one reported and six novel mutations in 5 different deafness autosomal recessive (DFNB) genes (TRIOBP, LHFPL5, CDH23, PCDH15, and MYO7A). The custom capture panel in our study provided an efficient and comprehensive diagnosis for known deafness genes in small families.

scholarly journals Netherton’s Syndrome: A Case of Two Male Siblings Diagnosed in Adulthood

2020 ◽  
Vol 12 (1) ◽  
pp. 64-69
Author(s):  
Akshay Flora ◽  
Annika Smith
Keyword(s):  
Genetic Disease ◽  
Sanger Sequencing ◽  
Autosomal Recessive ◽  
Correct Diagnosis ◽  
Hair Shaft ◽  
Cutaneous Inflammation ◽  
Erythrodermic Psoriasis ◽  
Timely Fashion ◽  
Congenital Ichthyosiform Erythroderma

Netherton’s syndrome (NS) is a rare autosomal recessive genetic disease caused by a germline mutation in the SPINK5 gene. It is most commonly diagnosed in neonates due to the presence of congenital ichthyosiform erythroderma. Affected individuals will typically also develop a hair shaft abnormality known as trichorrhexis invaginata, severe atopy, and a migratory rash known as ichythyosis linearis circumflexa. The chronicity and severity of NS adversely affects a patient’s quality of life to a large extent. It Is therefore important that this condition is identified early, and treatment to reduce cutaneous inflammation is initiated in a timely fashion. However, due to this condition being relatively rare, a lack of awareness may lead clinicians to misdiagnose it as atopic dermatitis or undifferentiated psoriasis. Clinicians should therefore be aware of the peripheral stigmata that this disease may present as in adulthood, so that a correct diagnosis can be made if it was previously missed. Here we present a case of two male siblings from Jordon who were misdiagnosed since childhood as having erythrodermic psoriasis. Clinical examination of one of the siblings, as an adult, revealed multiple peripheral features associated with NS. Genetic analysis through sanger sequencing was also able to identify a mutation in the SPINK5 gene, confirming the diagnosis.

Novel mutations of TGM1 in a child with congenital ichthyosiform erythroderma

2001 ◽  
Vol 144 (2) ◽  
pp. 401-407 ◽  
Author(s):  
M. Akiyama ◽  
Y. Takizawa ◽  
T. Kokaji ◽  
H. Shimizu
Keyword(s):  
Novel Mutations ◽  
Congenital Ichthyosiform Erythroderma

Novel truncating and missense mutations of the KCC3 gene associated with Andermann syndrome

Neurology ◽  
2006 ◽  
Vol 66 (7) ◽  
pp. 1044-1048 ◽  
Author(s):  
G. Uyanik ◽  
N. Elcioglu ◽  
J. Penzien ◽  
C. Gross ◽  
Y. Yilmaz ◽  
...  
Keyword(s):  
Missense Mutation ◽  
Autosomal Recessive ◽  
Sensory Neuropathy ◽  
Variable Degree ◽  
Missense Mutations ◽  
Novel Mutations ◽  
The Third ◽  
Truncating Mutation ◽  
Cerebral Mri ◽  
Different Types

Background: Andermann syndrome (OMIM 218000) is an autosomal recessive motor-sensory neuropathy associated with developmental and neurodegenerative defects. The cerebral MRI reveals a variable degree of agenesis of the corpus callosum. Recently, truncating mutations of the KCC3 gene (also known as SLC12A6) have been associated with Andermann syndrome.Methods: The authors assessed clinically and genetically three isolated cases from Germany and Turkey with symptoms consistent with Andermann syndrome.Results: The authors detected four novel mutations within the KCC3 gene in their patients: two different truncating mutations in the first patient, a homozygous truncating mutation in the second, and a homozygous missense mutation in the third patient. In contrast to the classic phenotype of the Andermann syndrome linked to truncating KCC3 mutations the phenotype and the course of the disease linked to the missense mutation appeared to be different (i.e., showing additional features like diffuse and widespread white matter abnormalities).Conclusions: Not only truncating but also missense mutations of the KCC3 gene are associated with Andermann syndrome. Different types of KCC3 mutations may determine different clinical phenotypes.

scholarly journals Autosomal recessive retinal dystrophy associated with two novel mutations in the RPE65 gene

1998 ◽  
Vol 6 (5) ◽  
pp. 527-531 ◽  
Author(s):  
Françoise Marlhens ◽  
Jean-Michel Griffoin ◽  
Corinne Bareil ◽  
Bernard Arnaud ◽  
Mireille Claustres ◽  
...  
Keyword(s):  
Autosomal Recessive ◽  
Retinal Dystrophy ◽  
Novel Mutations
Sign in / Sign up

Export Citation Format

Share Document