X-linked Ichthyosis Research Articles

Co-Occurrence of Autosomal Recessive Lamellar Ichthyosis and X-Linked Recessive Ichthyosis in a Consanguineous Pakistani Family.

Co-Occurrence of Autosomal Recessive Lamellar Ichthyosis and X-Linked Recessive Ichthyosis in a Consanguineous Pakistani Family.

Revealing the mysteries of X-linked recessive ichthyosis.

Revealing the mysteries of X-linked recessive ichthyosis.

A novel missense mutation of the STS gene in two siblings with X-linked ichthyosis, complicated by short stature, bone density reduction, epilepsy, and cryptorchidism

A novel missense mutation of the <i>STS</i> gene in two siblings with X-linked ichthyosis, complicated by short stature, bone density reduction, epilepsy, and cryptorchidism

Evidence of the high prevalence of neurological disorders in nonsyndromic X-linked recessive ichthyosis: a retrospective case series.

X-linked recessive ichthyosis (XLI) is a relatively common type of ichthyosis caused by a deficiency in the steroid sulfatase (STS) enzyme. It is the only type of ichthyosis that can be both syndromic and nonsyndromic. Typical clinical features include dark-brown scale of variable size favouring the extensor surfaces of the extremities. To characterize clinically nonsyndromic XLI, with a particular focus on extracutaneous manifestations. This was a multicentre retrospective review of clinical findings from a case series of patients with a clinical and genetic diagnosis of XLI. We identified 30 patients with XLI belonging to 25 different families carrying a deletion in the STS locus. All patients had dark scales of variable size on the extensor surfaces of the extremities. Lack of flexural involvement and pruritus were common but inconsistent findings, whereas palmoplantar hyperlinearity was absent in all but one patient. A history of orchiopexy was present in 10% and thus was more common than expected vs. the general population (3%). Neurological disorders including epilepsy (13%) and attention deficit hyperactivity disorder (ADHD; 30%) were over-represented in patients with XLI. This was a retrospective study with a limited number of patients. In the absence of confirmatory genetic testing and family history of the disease, dark-brown scale of the extensor surfaces and the absence of palmoplantar hyperlinearity appear to be the most reliable clinical findings supporting a diagnosis of XLI. Dermatologists should be aware of the high prevalence of ADHD and epilepsy in patients with nonsyndromic XLI.

Study of prevalence of different forms of ichthyosis in Kharkiv region

Ichthyosis is genetically and clinically heterogenic group of epidermis keratinization disorders. Its prevalence is geographically different. Aim. The aim of this research was to evaluate ichthyosis prevalence in Kharkiv region. Methods. The collection of clinical-genealogical history was carried out by the method of single registration of the proband on the basis of the Regional Clinical Dermatological and Venereological Health Center No. 1 and the Dermatovenerological Health Centers of the Kharkiv Region in 2017. Results. The ichthyosis prevalence in Kharkiv region was 2.5·10–4 in 2017. The ichthyosis prevalence varied from 6.7∙10‑5 in Krasnohrad district to 1.0∙10‑3 in Dvorichna district. The least prevalence was in the population of Vovchansk city (1.1∙10‑4) and the highest one was in the population of Dvorichna city (10.7∙10‑4). The differences between the prevalence of ichthyosis vulgaris in Kharkiv region in 2008-2017 were established. Conclusions. It was found that the decrease of ichthyosis prevalence in Kharkiv region was 1.6 times during last 10 years. This index for ichthyosis vulgaris was decreased 1.9 times at the same period. Monogenic dermatoses, as an example of ichthyosis, can be used both to monitor the burden of genetic disorders in the region and to solve the problems of general and personal genetic safety in the population.&#x0D; Keywords: ichthyosis vulgaris, X-linked recessive ichthyosis, prevalence.

X-linked ichthyosis: Clinical and molecular findings in 35 Italian patients.

Recessive X-linked ichthyosis (XLI), the second most common ichthyosis, is caused by mutations in the STS gene encoding the steroid sulfatase enzyme. A complete deletion of the STS gene is found in 85%-90% of cases. Rarely, larger deletions involving contiguous genes are detected in syndromic patients. We report the clinical and molecular genetic findings in a series of 35 consecutive Italian male patients. All patients underwent molecular testing by MLPA or aCGH, followed, in case of negative results, by next-generation sequencing analysis. Neuropsychiatric, ophthalmological and paediatric evaluations were also performed. Our survey showed a frequent presence of disease manifestations at birth (42.8%). Fold and palmoplantar surfaces were involved in 18 (51%) and 7 (20%) patients, respectively. Fourteen patients (42%) presented neuropsychiatric symptoms, including attention-deficit hyperactivity disorder and motor disabilities. In addition, two patients with mental retardation were shown to be affected by a contiguous gene syndrome. Twenty-seven patients had a complete STS deletion, one a partial deletion and 7 carried missense mutations, two of which previously unreported. In addition, a de novo STS deletion was identified in a sporadic case. The frequent presence of palmoplantar and fold involvement in XLI should be taken into account when considering the differential diagnosis with ichthyosis vulgaris. Our findings also underline the relevance of involving the neuropsychiatrist in the multidisciplinary management of XLI. Finally, we report for the first time a de novo mutation which shows that STS deletion can also occur in oogenesis.

Genetic testing and prenatal diagnosis of X-linked ichthyosis in two pedigrees

Objective To analyze genetic testing and prenatal diagnosis of two pedigrees with X-linked ichthyosis. Methods Karyotyping, bacterial artificial chromosomes-on-BeadsTM (BoBs), fluorescence in situ hybridization (FISH) and single nucleotide polymorphism array (SNP-array) were used to detect amniotic fluid and peripheral blood specimens of two pedigrees, one with and one without known family history of ichthyosis. Clinical data was collected and analyzed as well. Results (1) The pedigree without known family history: Prenatal BoBs showed that the XC1 probe of fetusⅣ-12 was from 0.36 to 0.50, suggesting the presence of microdeletion. SNP-array analysis of gravidaⅢ-13 showed a 1.68 Mb copy number deletion at Xp22.31 and four missing Online Mendelian Inheritance in Man (OMIM) genes (HDHD1, STS, VCX and PNPLA4). Fetal SNP-array revealed a deletion of arr[hg19] Xp22.31 (6 455 151-8 135 644)×0, indicating a maternally inherited one. FISH analysis verified the deletion in STS gene in fetus Ⅳ-12, whose karyotype was 46, XY. The gravida's female cousin (Ⅲ-21) and nephew (Ⅳ-14) also had STS gene deletion, which size was the same as that from the gravida and the fetus. Fetus (Ⅳ-12) was delivered at term by cesarean section with normal skin, but an extensive white scales appeared on the abdomen one week after birth and the symptom was aggravated when the weather was dry. The infant was followed up to eight months old and no other clinical symptoms were found. (2) The pedigree with known family history: SNP-array revealed that a 1.2 Mb copy number deletion at Xp22.31 and four missing OMIM genes (HDHD1, STS, VCX and PNPLA4) were detected in pregnant women (Ⅲ-21), proband (Ⅳ-16) and fetus (Ⅳ-17). FISH analysis of the fetus verified the deletion in STS gene. The karyotype of the fetus was 46, XY. FetusⅣ-17 was delivered at term by cesarean section with normal skin, but white scales widely appeared on the abdomen ten days after birth. The infant was followed up to four months old and no other clinical symptoms were found. Conclusion Molecular genetic techniques such as BoBs, FISH and SNP-array are used in combination in this study to provide genetic testing and prenatal diagnosis to two XLI pedigrees, which is helpful for clinical diagnosis and genetic counseling. Key words: Ichthyosis, X-linked; Pedigree; Steryl-sulfatase; Prenatal diagnosis; Genetic testing

Neurological manifestations of X-linked ichthyosis: case report and review of the literature (P3.337)

Neurological manifestations of X-linked ichthyosis: case report and review of the literature (P3.337)

Whole-exome sequencing for diagnosis of hereditary ichthyosis.

Hereditary ichthyosis constitutes a diverse group of cornification disorders. Identification of the molecular cause facilitates optimal patient care. We wanted to estimate the diagnostic yield of applying whole-exome sequencing (WES) in the routine genetic workup of inherited ichthyosis. During a 3-year-period, all ichthyosis patients, except X-linked and mild vulgar ichthyosis, consecutively admitted to a university hospital clinic were offered WES with subsequent analysis of ichthyosis-related genes as a first-line genetic investigation. Clinical and molecular data have been collected retrospectively. Genetic variants causative for the ichthyosis were identified in 27 of 34 investigated patients (79.4%). In all, 31 causative mutations across 13 genes were disclosed, including 12 novel variants. TGM1 was the most frequently mutated gene, accounting for 43.7% of patients suffering from autosomal recessive congenital ichthyosis (ARCI). Whole-exome sequencing appears an effective tool in disclosing the molecular cause of patients with hereditary ichthyosis seen in clinical practice and should be considered a first-tier genetic test in these patients.

SULFATION PATHWAYS: Alternate steroid sulfation pathways targeted by LC-MS/MS analysis of disulfates: application to prenatal diagnosis of steroid synthesis disorders.

The steroid disulfates (aka bis-sulfates) are a significant but minor fraction of the urinary steroid metabolome that have not been widely studied because major components are not hydrolyzed by the commercial sulfatases commonly used in steroid metabolomics. In early studies, conjugate fractionation followed by hydrolysis using acidified solvent (solvolysis) was used for the indirect detection of this fraction by GC-MS. This paper describes the application of a specific LC-MS/MS method for the direct identification of disulfates in urine, and their use as markers for the prenatal diagnosis of disorders causing reduced estriol production: STSD (steroid sulfatase deficiency), SLOS (Smith-Lemli-Opitz syndrome) and PORD (P450 oxidoreductase deficiency). Disulfates were detected by monitoring a constant ion loss (CIL) from the molecular di-anion. While focused on disulfates, our methodology included an analysis of intact steroid glucuronides and monosulfates because steroidogenic disorder diagnosis usually requires an examination of the complete steroid profile. In the disorders studied, a few individual steroids (as disulfates) were found particularly informative: pregn-5-ene-3β,20S-diol, pregn-5-ene-3β,21-diol (STSD, neonatal PORD) and 5α-pregnane-3β,20S-diol (pregnancy PORD). Authentic steroid disulfates were synthesized for use in this study as aid to characterization. Tentative identification of 5ξ-pregn-7-ene-3ξ,20S-diol and 5ξ-pregn-7-ene-3ξ,17,20S-triol disulfates was also obtained in samples from SLOS affected pregnancies. Seven ratios between the detected metabolites were applied to distinguish the three selected disorders from control samples. Our results show the potential of the direct detection of steroid conjugates in the diagnosis of pathologies related with steroid biosynthesis.

Complex care of individuals with multiple sulfatase deficiency: Clinical cases and consensus statement

Multiple sulfatase deficiency (MSD) is an ultra-rare neurodegenerative disorder that results in defective sulfatase post-translational modification. Sulfatases in the body are activated by a unique protein, formylglycine-generating enzyme (FGE) that is encoded by SUMF1. When FGE is absent or insufficient, all 17 known human sulfatases are affected, including the enzymes associated with metachromatic leukodystrophy (MLD), several mucopolysaccharidoses (MPS II, IIIA, IIID, IVA, VI), chondrodysplasia punctata, and X-linked ichthyosis. As such, individuals demonstrate a complex and severe clinical phenotype that has not been fully characterized to date. In this report, we describe two individuals with distinct clinical presentations of MSD. Also, we detail a comprehensive systems-based approach to the management of individuals with MSD, from the initial diagnostic evaluation to unique multisystem issues and potential management options. As there have been no natural history studies to date, the recommendations within this report are based on published studies and consensus opinion and underscore the need for future research on evidence-based outcomes to improve management of children with MSD.

Ocular complications of lamellar ichthyosis

Ichthyosis is a rare heterogeneous cutaneous disorder characterized by hyperkeratinization of the skin. They may be inherited or acquired following malnutrition, malignancy, or autoimmune disorders. Common forms of ichthyosis include lamellar ichthyosis (LI), X-linked ichthyosis, bullous ichthyosiform erythroderma, and ichthyosis vulgaris. LI may be associated with ectropion and eclabion and if poorly managed could result in vision loss. The case of a 7-month-old girl who presented with bilateral keratitis, panophthalmitis, and perforated right cornea is reported in this communication.

Increased Prevalence of Filaggrin Deficiency in 51 Patients with Recessive X-Linked Ichthyosis Presenting for Dermatological Examination

Abstract X-linked ichthyosis (XLI) is a keratinization disorder caused by deficient activity of steroidsulfatase. In contrast, ichthyosis vulgaris is due to semidominant mutations of the filaggrin gene ( FLG ). In view of phenotypic variations of these ichthyoses we speculated that XLI may be influenced by additional FLG mutations in a significant number of patients. We characterized a group of 51 patients with XLI and systematically analyzed them for additional FLG mutations (R501X, 2282del4, R2447X, S3247X). The study was complemented by morphological analyses. Full FLG sequencing for rare mutations was performed in special cases. Interestingly, prevalence of FLG mutations was significantly increased compared to a population-based control cohort of 1,377 individuals (17.6% vs. 8.4%, p=0.038). Palmoplantar hyperlinearity was significantly associated with the FLG mutation status. Ichthyosis severity score seemed to be increased in XLI with FLG mutations, but the difference was not significant (p=0.124). To our surprise, percentages of atopic manifestations were highly prevalent in both subgroups, 40% and 33% in XLI without and with filaggrin deficiency, respectively. Of note, reduction of filaggrin staining or keratohyalin could not be explained by FLG mutations in all patients. However, we conclude that FLG mutations represent a significant genetic modifier of XLI. [196 words]

Kallmann syndrome and ichthyosis: a case of contiguous gene deletion syndrome.

Kallmann syndrome is a genetically heterogeneous form of hypogonadotropic hypogonadism caused by gonadotropin-releasing hormone deficiency and characterized by anosmia or hyposmia due to hypoplasia of the olfactory bulbs; osteoporosis and metabolic syndrome can develop due to longstanding untreated hypogonadism. Kallmann syndrome affects 1 in 10 000 men and 1 in 50 000 women. Defects in 17 genes, including KAL1, have been implicated. Kallmann syndrome can be associated with X-linked ichthyosis, a skin disorder characterized by early onset dark, dry, irregular scales affecting the limb and trunk, caused by a defect of the steroid sulfatase gene (STS). Both KAL1 and STS are located in the Xp22.3 region; therefore, deletions in this region cause a contiguous gene syndrome. We report the case of a 32-year-old man with ichthyosis referred for evaluation of excessive height (2.07 m) and weight (BMI: 29.6 kg/m2), microgenitalia and absence of secondary sex characteristics. We diagnosed Kallmann syndrome with ichthyosis due to a deletion in Xp22.3, a rare phenomenon. Learning points: Kallmann syndrome is a genetically heterogeneous disease characterized by hypogonadotropic hypogonadism with anosmia or hyposmia associated with defects in the production or action of gonadotropin-releasing hormone (GnRH) and hypoplasia of the olfactory bulbs. Several genes have been implicated in Kallmann syndrome, including KAL1, located in the Xp22.3 region, which is responsible for X-linked Kallmann syndrome. KAL1 encodes the protein anosmin-1. X-linked ichthyosis is caused by deficiency of the steroid sulfatase enzyme, encoded by STS, which is also located in the Xp22.3 region. Deletions involving this region can affect both genes and result in contiguous gene syndromes. Phenotype can guide clinicians toward suspicion of a specific genetic mutation. KAL1 mutations are mostly related to microgenitalia, unilateral renal agenesis and synkinesia, although patients need not present all these abnormalities. Longstanding untreated hypogonadism is associated with poor sexual health, osteoporosis and metabolic syndrome with the concomitant risk of developing type 2 diabetes mellitus and obesity. Treatment aims to promote the development of secondary sex characteristics, build and sustain normal bone and muscle mass and restore fertility. Treatment can also help minimize some psychological consequences. Treatments available for patients with congenital GnRH deficiency such as Kallmann syndrome include gonadal steroid hormones, human gonadotropins and GnRH. The choice of therapy depends on the goal or goals.

X-linked ichthyosis associated with psychosis and behavioral abnormalities: a case report

BackgroundX-linked ichthyosis is a dermatological condition caused by deficiency for the enzyme steroid sulfatase. Previously, X-linked ichthyosis/steroid sulfatase deficiency has been associated with developmental and neurological phenotypes. Here, we show for the first time, that X-linked ichthyosis may be comorbid with an additional psychiatric phenotype (psychosis).Case presentationWe report the case of an 11-year-old Saudi Arabian boy with X-linked ichthyosis associated with psychosis, mental retardation, autism spectrum disorder, inattentive attention deficit hyperactivity disorder, and epilepsy. Genetic analysis revealed a 1.68 Mb deletion encompassing STS in 95% of cells while biochemical analysis revealed correspondingly low steroid sulfatase activity consistent with a diagnosis of X-linked ichthyosis. The psychotic symptoms could be reasonably well controlled by administration of an atypical antipsychotic.ConclusionsThis report describes a case of comorbid X-linked ichthyosis and psychosis (most closely corresponding to early-onset schizophrenia) for the first time, and suggests that deficiency for steroid sulfatase and contiguous genes may increase vulnerability to psychosis as well as other psychological disorders.

Concurrent Chondrodysplasia Punctata Type 2 (Conradi–Hunermann–Happle Syndrome) and Ichthyosis Vulgaris in Teenaged Twin Girls

We present concurrent X-linked chondrodysplasia punctata and ichthyosis vulgaris in adolescent fraternal twin girls, notable for initial presentation with dry skin in adolescence, characterized by dark-brown scale typical of ichthyosis vulgaris and blaschkolinear, atrophic, scaly plaques. This constellation of findings prompted further genetic investigation. Using a multigene approach to examine 39 genes associated with congenital ichthyosis, next-generation sequencing revealed a novel heterozygous missense mutation at a mutational hotspot in the EBP gene c.439C>T (p.R147C) in conjunction with a single nonsense mutation in the FLG gene (p.R501X) in both sisters. These individuals highlight the clinical variability of Conradi-Hunermann-Happle syndrome, illustrate the possibility of co-occurrence of rare and common forms of ichthyosis, and demonstrate the utility of multigene analysis.

Steroid sulfatase and filaggrin mutations in a boy with severe ichthyosis, elevated serum IgE level and moyamoya syndrome

X-linked ichthyosis (XLI) is a relatively common, recessive condition caused by mutations in the steroid sulfatase (STS) gene. Common loss-of-function mutations in the filaggrin gene (FLG) cause ichthyosis vulgaris and predispose individuals to atopic eczema. We report a case of a 6-year-old boy who presented with unusually severe XLI, an increased serum immunoglobulin E level (2120IU/ml) and moyamoya angiopathy. Whole-exome sequencing identified a gross deletion encompassing the STS in Xp22.31 and the p.K4022X FLG mutation. The deletion is at least 1.6Mb in size in the proband, based on real-time quantitative polymerase chain reaction results. No other genetic mutations related to ichthyosis, moyamoya or hyper-immunoglobulin E syndrome were detected. Furthermore, his mother's brothers suffered from mild XLI and only had a deletion encompassing the STS. Additionally, his father and older sister suffered from mild ichthyosis vulgaris and had the p.K4022X FLG mutation. We report the first case of XLI with concurrent moyamoya syndrome. Moreover, an IgE-mediated immune response may have triggered the moyamoya signaling cascade in this patient with ichthyosis. Furthermore, our study strengthens the hypothesis that filaggrin defects can synergize with an STS deficiency to exacerbate the ichthyosis phenotype in an ethnically diverse population.

In vivo confocal microscopy of pre-Descemet corneal dystrophy associated with X-linked ichthyosis: a case report

BackgroundPre-Descemet corneal dystrophy (PDCD) is characterized by the presence of numerous, tiny, polymorphic opacities immediately anterior to Descemet membrane, which is a rare form of corneal stromal dystrophy and hard to be diagnosed. In vivo confocal microscopy (IVCM) is a useful tool to examine the minimal lesions of the cornea at the cellular level. In this article, we report a rare case of PDCD associated with X-linked ichthyosis and evaluate IVCM findings.Case presentationWe present a 34-year-old male Chinese patient with PDCD associated with X-linked ichthyosis. Slit-lamp biomicroscopy showed the presence of tiny and pleomorphic opacities in the posterior stroma immediately anterior to Descemet membrane bilaterally. IVCM revealed regular distributed hyperreflective particles inside the enlarged and activated keratocytes in the posterior stroma. Hyperreflective particles were also observed dispersedly outside the keratocytes in the anterior stroma. Dermatological examination revealed that the skin over the patient’s entire body was dry and coarse, with thickening and scaling of the skin in the extensor side of the extremities. PCR results demonstrated that all ten exons and part flanking sequences of STS gene failed to produce any amplicons in the patient.ConclusionsIVCM is useful for analyzing the living corneal structural changes in rare corneal dystrophies. We first reported the IVCM characteristics of PDCD associated with X-linked ichthyosis, which was caused by a deletion of the steroid sulfatase (STS) gene, confirmed by gene analysis.

Psychological phenotypes associated with the rare skin disease x-linked Ichthyosis

Psychological phenotypes associated with the rare skin disease x-linked Ichthyosis

Clinico-epidemiological Study of Congenital Ichthyosis in a Tertiary Care Center of Eastern India.

Background:Congenital ichthyoses comprises various specific genetic diseases and can range from mild to very severe presentation. Furthermore, these may be associated with various syndromes. There is scanty data regarding the demographic profile and clinical features of patients with congenital ichthyosis in India.Aims and Objectives:The aim is to evaluate the epidemiology and clinical characteristics of various types of congenital ichthyoses.Materials and Methods:The study was conducted for 1 year from April 2013 to March 2014. Patients were evaluated for epidemiological profile and clinical features.Results:During the study of 1 year, 106 patients of congenital ichthyoses were identified. The most common of the various ichthyoses was ichthyosis vulgaris, followed by lamellar ichthyosis, X-linked recessive ichthyosis. One case of Netherton syndrome and one of ichthyosis hystrix were also identified.Conclusion:Various types of congenital ichthyoses present with different clinical features which range from mild to severe. These present with significant psychological stress to both patients and their families. Furthermore, all these diseases have significant implications of transmission to their offspring.