Identification of a novel nonsense ATP2A2 gene variant in a patient with Darier's disease flare following COVID-19 infection: A case report.

RATIONALE: Darier disease (DD) is a rare autosomal dominant disorder that primarily manifests as hyperkeratotic papules and itching. The underlying etiology of DD is pathogenic variation in the ATP2A2 gene. However, this disease has a high penetrance but variable expressivity, indicating that patients inheriting the genotype may have different manifestations due to exogenous factors. Meanwhile, a few reports have documented that COVID-19 may be implicated in the flare of DD. PATIENT CONCERNS: A 51-year-old man presented with keratotic papules and scaly erythematous rash on his trunk with pruritus after being infected with COVID-19. Laboratory test results were normal. Histological analysis revealed epidermal hyperkeratosis and intraepidermal lacunae containing dyskeratinized cells. Genetic analysis revealed a novel variant of ATP2A2 (c.815G>A, p.Trp272*), which was considered pathogenic in this case. DIAGNOSES: The patient was diagnosed as having DD. INTERVENTIONS: Oral acitretin and topical corticosteroid hormone ointments were used. OUTCOMES: The patient achieved complete resolution of symptoms during the 3-month follow-up period. LESSONS: We revealed the first novel ATP2A2 variant (c.815G>A, p.Trp272*) in the flare of DD following COVID-19 infection. Additionally, this pathogenic variant enriches the ATP2A2 gene mutation spectrum.

Persistent Cutaneous Lesions of Darier Disease and Second-Hit Somatic Variants in ATP2A2 Gene.

Importance: Darier disease (DD) is a rare genetic skin disorder caused by heterozygous variants in the ATP2A2 gene. Clinical manifestations include recurrent hyperkeratotic papules and plaques that occur mainly in seborrheic areas. Although some of the lesions wax and wane in response to environmental factors, others are severe and respond poorly to therapy. Objective: To investigate the molecular mechanism underlying the persistency of skin lesions in DD. Design, Setting, and Participants: In this case series, DNA was extracted from unaffected skin, transient and persistent lesional skin, and blood from 9 patients with DD. Genetic analysis was used using paired-whole exome sequencing of affected skin and blood or by deep sequencing of ATP2A2 of affected skin. Chromosomal microarray analysis was used to reveal copy number variants and loss of heterozygosity. All variants were validated by Sanger sequencing or restriction fragment length polymorphism. Interventions or Exposures: Paired whole-exome sequencing and deep sequencing of ATP2A2 gene from blood and skin samples isolated from persistent, transient lesions and unaffected skin in patients with DD. Main Outcomes and Measures: Germline and somatic genomic characteristics of persistent and transient cutaneous lesions in DD. Results: Of 9 patients with DD, all had heterozygous pathogenic germline variants in the ATP2A2 gene, 6 were female. Participant age ranged from 40 to 69 years on enrollment. All 11 persistent skin lesions were associated with second-hit somatic variants in the ATP2A2 gene. The somatic variants were classified as highly deleterious via combined annotation-dependent depletion (CADD) scores or affect splicing, and 3 of them had been previously described in patients with DD and acrokeratosis verruciformis of Hopf. Second-hit variants in the ATP2A2 gene were not identified in the transient lesions (n = 2) or the normal skin (n = 2). Conclusions and Relevance: In this study, persistent DD lesions were associated with the presence of second-hit somatic variants in the ATP2A2 gene. Identification of these second-hit variants offers valuable insight into the underlying mechanisms that contribute to the lasting nature of persistent DD lesions.

Clinicopathologic and trichoscopic features of keratosis follicularis spinulosa decalvans: A case series study.

Keratosis follicularis spinulosa decalvans (KFSD) is a rare X-linked hereditary disorder characterized by the triad of follicular hyperkeratosis-photophobia-alopecia. The clinical heterogeneity makes the diagnosis difficult. To investigate the clinicopathologic and trichoscopic features of KFSD and to further clarify the essential requisites for the diagnosis, we conducted a retrospective study of patients with KFSD. The clinical information, histologic features, and trichoscopic findings were evaluated. Eight patients were from seven separate families. Two females were mother and daughter from the same family and the other six patients were male and represented sporadic cases. The average age of onset of alopecia was 21.25 years. Involvement of the scalp hairs leading to progressive scarring alopecia on the midline of the scalp with variable degrees of inflammation was the pathognomonic feature. It typically began after puberty. Vellus hair-associated follicular hyperkeratosis affected all of the patients. However, photophobia was not a constant feature. Histopathologic examination revealed disorders of the hair follicle with an acute-chronic inflammatory response. Follicular changes including fused infundibulum, the protrusion of the outer root sheath into the follicular canal, and a dilatation of the follicles at the isthmus level caused by the occlusion of keratin were observed. The trichoscopic features included perifollicular scaling, tufted hairs, and loss of follicular openings. In conclusion, terminal hair involvement, either scalp hairs, eyebrows, or eyelashes, and the hyperkeratosis of the follicle of vellus hairs is the diagnostic basis of KFSD. We hypothesize that follicular changes in histopathology are the primary event that trigger variable inflammation and further follicular destruction.

Dermoscopic findings and comparison of usefulness of longitudinal versus transversal sections in the histological diagnosis of alopecia X.

BACKGROUND: A combination of dermoscopic and histological findings may provide useful information for the diagnosis of hair follicle diseases. However, there are no studies on dermoscopic-histopathological correlations in dogs affected by alopecia X, and comparison of longitudinal versus transversal sectioning of skin biopsy specimens in the assessment of this hair loss disorder has not been thoroughly investigated. HYPOTHESIS/OBJECTIVES: The aim of this study was to correlate dermoscopic and histological features using both longitudinal and transversal sectioning of skin biopsy samples to gain additional information for the diagnosis of alopecia X. ANIMALS: Nineteen Pomeranian dogs affected by alopecia X and five healthy Pomeranians as controls. MATERIALS AND METHODS: Dermoscopic-histological correlation was performed within the diseased group, whereas histological comparisons against controls. The demographic and clinical characteristics also were related to the histological findings. RESULTS: The dermoscopic findings revealed scattered, thinned, short hairs mixed with amorphous keratoseborrhoeic-like material (follicular plugging), perifollicular and intrafollicular scaling, and hyperpigmentation varying from pinpoint black spots to a diffuse texture. Dermoscopic findings correlated with histological findings for selected qualitative and quantitative findings. The usefulness of transversal sections was demonstrated in accurately determining the hair follicular density and counts, growth arrest phases and in identifying mineralisation of hair follicle basement membrane when compared to the longitudinal. Conversely, no correlations between histological findings and demographic and clinical characteristics were detected. CONCLUSIONS AND CLINICAL RELEVANCE: These data provide evidence of the usefulness of dermoscopic evaluation as an accessory diagnostic tool and of transversal sections of skin biopsies as complementary to the diagnosis of alopecia X.

Th17-associated cytokines IL-17 and IL-23 in inflamed skin of Darier disease patients as potential therapeutic targets.

Darier disease (DD) is a rare, inherited multi-organ disorder associated with mutations in the ATP2A2 gene. DD patients often have skin involvement characterized by malodorous, inflamed skin and recurrent, severe infections. Therapeutic options are limited and inadequate for the long-term management of this chronic disease. The aim of this study was to characterize the cutaneous immune infiltrate in DD skin lesions in detail and to identify new therapeutic targets. Using gene and protein expression profiling assays including scRNA sequencing, we demonstrate enhanced expression of Th17-related genes and cytokines and increased numbers of Th17 cells in six DD patients. We provide evidence that targeting the IL-17/IL-23 axis in a case series of three DD patients with monoclonal antibodies is efficacious with significant clinical improvement. As DD is a chronic, relapsing disease, our findings might pave the way toward additional options for the long-term management of skin inflammation in patients with DD.

Keratosis Pilaris: Treatment Practices of Board-Certified Dermatologists.

Keratosis pilaris (KP) is a chronic disorder of follicular hyperkeratinization and perifollicular erythema with lesions affecting the extensor surfaces of arms, upper legs, and buttocks. While there is some evidence that laser therapies and topical therapies such as lactic acid reduce the follicular papules of KP, support is limited with respect to which topical treatments dermatologists utilize and their perception of efficacy. A 16-question survey was distributed to a random sampling of the ODAC Conference listserv to determine which topical treatments dermatologists utilize the most, the duration of therapy needed with various treatment modalities, and the effectiveness of topical and laser therapy for treating KP. Our study found topical lactic acid is the most used first-line therapy for KP (43.63% of survey respondents), followed by salicylic acid (20.72%). Laser therapy is only utilized by 8.76% of survey respondents, with a lack of insurance coverage and proper equipment limiting its use. KP is often recalcitrant to treatment, and our study demonstrated that over 60% of respondents found recurrence of KP lesions within three months of stopping salicylic acid treatment and OTC moisturizer treatment. The data herein can be used to better utilize the selection of topical and laser therapies for the treatment of KP. J Drugs Dermatol. 2023;22(10):985-989 doi:10.36849/JDD.7534.

COVID-19 infection- and vaccination-related exacerbation of Darier's disease in a single patient.

Darier's disease (DD) is a rare autosomal dominantly inherited disorder. DD patients usually present with widespread keratotic eruptions with itching in the seborrheic regions that are exacerbated by various factors, including heat, sweat, and physical trauma. The SARS-CoV-2 (COVID-19) pandemic has stirred confusion among the medical community, including dermatologists, as this infection has been implicated in various skin conditions. Only a handful of reports have documented DD associated with COVID-19. Here, we report a 30-year-old male with Darier's disease whose symptoms were exacerbated following both COVID-19 vaccination and COVID-19 infection. The patient had noticed slight eruptions 7 years prior, but was not particularly concerned. After COVID-19 vaccination and infection, he had erythematous maculopapular lesions in large areas of the trunk and extremities. The previously reported pathogenic variant c.2255_2257del (p.(Ile752_Tyr753delinsAsn)) in ATP2A2 was detected in the present patient. Oral etretinate greatly improved his DD manifestations. As far as we know, the present patient is the first genetically confirmed DD case who showed both COVID-19 infection- and vaccination-related DD exacerbations independently. We think that the further accumulation of DD cases exacerbated by COVID-19 infection/vaccination is needed to clarify the mechanisms of DD aggravation.

Exacerbation of Darier disease with lithium therapy.

Darier disease is an autosomal dominant blistering disorder linked to mutation of the endoplasmic reticulum calcium pump, SERCA2, which compromises keratinocyte adhesion and differentiation. Beyond the typical keratotic and eroded skin lesions, patients with Darier disease often present with psychiatric co-morbidities. Herein, we present a biopsy-confirmed case of Darier disease in a patient with bipolar disorder, whose cutaneous disease dramatically worsened upon initiation of lithium therapy. In consultation with the patient's psychiatrist, lithium was tapered, leading to rapid improvement in her skin. This case highlights the potential for lithium to complicate management of Darier disease and underscores the need for dermatologists to collaborate with psychiatrists to optimize both cutaneous and mental health in patients.

Darier Disease with Psoriasis.

Darier disease is an autosomal dominant disorder with dark crusty patches and is classified as hereditary acantholytic dermatosis. Keratotic papules and crust are often present on the scalp, forehead, chest, back, upper arms, elbows, groin, and behind the ears, predominantly in seborrheic areas. A 48-year-old male patient presented skin lesions with pruritus on the trunk and both upper and lower extremities. He first noticed the lesion 15 years before. On physical examination, there were multiple erythematous papules with crust on the trunk and red-brown colored keratotic plaque on both extremities. The suspected histopathological diagnosis was psoriasis vulgaris. The patient's skin lesions and pruritus were significantly improved after the psoriasis treatment. While continuing psoriasis treatment, the patient showed sudden worsening of the skin lesions on the scalp, abdomen, and fingernails (V-shaped nicks) with pruritus. Punch biopsy was performed on the abdominal lesion again and the final diagnosis was Darier disease. The patient was then treated using alitretinoin while maintaining the use of guselkumab for psoriasis. There are only a few cases that we found in which patients with Darier disease also had psoriasis. We report this rare case of Darier disease with psoriasis and propose that an additional biopsy might be necessary for accurate diagnosis and proper treatment.

A case of segmental form of type 1 mosaic Darier's disease.

Darier's disease is a rare genetic disorder with autosomal dominant inheritance. It is characterized by hyperkeratotic papules in seborrheic areas. Associated abnormalities include nail abnormalities and changes in the mucous membranes. Exacerbation of the disease occurs with exposure to high temperatures, sun, and sweating, resulting in a worsening clinical picture in summer months. The unilateral zosteriform pattern is a rare variant that is clinically manifested by a unilateral outbreak of erythematous keratotic papules without any other associated symptoms. Here we present a 52-year-old male with a zosteriform pattern of Darier's disease. We also discuss the most important clinical and pathohistological characteristics of the disease and various treatment options.

Whole-transcriptome sequencing identifies postzygotic ATP2A2 mutations in a patient misdiagnosed with herpes zoster, confirming the diagnosis of very late-onset segmental Darier disease.

An 82-year-old female patient presented with a recent onset of painful skin lesions in unilateral distribution on the abdominal area following the lines of Blaschko; the initial diagnosis of Varicella-Zoster infection was made. However, because the individual lesions appeared as hyperkeratotic papules and were unresponsive to antiviral therapy, a skin biopsy was performed, which revealed hyperkeratosis, suprabasal acantholysis and dyskeratosis with corps ronds and grains, consistent with acantholytic dyskeratotic acanthoma. Since this entity has been associated with Darier disease, whole-transcriptome sequencing by RNA-Seq was performed on RNA isolated from a lesion and from adjacent normal appearing skin, and a recently developed bioinformatics pipeline that can identify both genomic sequence variants and the presence of any of 926 viruses was applied. Two pathogenic missense mutations in the ATP2A2 gene were identified in the lesional but not in normal appearing skin, and no evidence of Varicella-Zoster infection was obtained. These findings confirm the diagnosis of segmental Darier disease due to postzygotic mutations in the ATP2A2 gene, and attest to the power of a novel single-step application of RNA-Seq in providing correct diagnosis in this rare genodermatosis.

Localized Darier disease: three cases of Type 1 segmental mosaicism.

Darier disease (DD) is an autosomal dominant acantholytic dermatosis with an estimated prevalence of 1 in 30 000-100 000. A localized form of DD was first described by Kreibich in 1906 and is thought to account for 10% of all cases. A number of clinical variants have been reported including: unilateral, linear, segmental or zosteriform DD. We present a case series of three patients with localized DD.

A detailed regimen of isotretinoin for the successful treatment of severe keratosis pilaris.

Although a well-known recommended treatment option, there are currently no studies that describe the detailed regimen of isotretinoin for the treatment of primary keratosis pilaris. Based on previous studies involving other hyperkeratotic disorders, this report describes a safe and effective treatment course of isotretinoin for severe keratosis pilaris.

Dermoscopy of Zosteriform and Swirling Pattern Type 1 Segmental Darier Disease.

Dear Editor, Segmental Darier disease (DD) is a rare disease with around 40 described English literature cases. It is hypothesized that one of the causes of the disease is a post-zygotic somatic mutation for the calcium ATPase pump, only present in lesional skin. There are two types of segmental DD: type 1, where lesions follow Blaschko's lines unilaterally, and type 2, characterized by focal areas of increased severity in patients with generalized DD (1). Type 1 segmental DD is not easily diagnosed due to the lack of positive family history, the late onset of the disease in the third or fourth decade of life, and lack of DD-associated features. The differential diagnosis of type 1 segmental DD includes acquired papular dermatoses distributed in linear or zosteriform fashion, such as lichen planus, psoriasis, lichen striatus, or linear porokeratosis (2). We report two cases of segmental DD, of which the first case was a 43-year-old woman who presented with pruritic skin changes five years in duration and a history of seasonal aggravation. On examination, light brownish to reddish keratotic small papules were observed on the left abdomen and inframammary area, arranged in a swirling pattern (Figure 1, a). Dermoscopy showed polygonal or roundish yellowish/brown areas surrounded with whitish structureless areas (Figure 1, b). The histopathological correlations for dermoscopic brownish polygonal or round areas are hyperkeratosis, parakeratosis, and dyskeratotic keratinocytes, which were present in the biopsy specimen (Figure 1, c). The patient was prescribed 0.1% tretinoin gel, which led to marked improvement (Figure 1, d). The second case was a 62-year-old woman who presented with a flare of small red-brown papules, eroded papules, and some yellowish crusts arranged in a zosteriform pattern on the right side of the upper abdomen (Figure 2, a). Dermoscopy showed polygonal, roundish, yellowish areas surrounded with whitish and reddish structureless areas (Figure 2, b). Histopathology mainly revealed compact orthokeratosis and small foci of parakeratosis, marked granular layer with dyskeratotic keratinocytes, and foci of suprabasal acantholysis consistent with the diagnosis of DD (Figure 2, d, d). The patient was prescribed topical steroid cream and 0.1% adapalene cream, which also led to improvement. In both of our cases, a final diagnosis of type 1 segmental DD was established based on clinico-histopathologic correlation, since acantholytic dyskeratotic epidermal nevus could not have been ruled out only based on the histopathology report as it is clinically and histologically indistinguishable from segmental DD. However, the late age of onset and aggravation resulting from external factors such as heat, sunlight, and sweat supported the diagnosis of segmental DD. Although the final diagnosis of type 1 segmental DD is typically established based on clinico-histopathological correlation, we find dermoscopy particularly useful in aiding the diagnosis by eliminating differential diagnoses and being aware of their well-known dermoscopic patterns.

A Case of Segmental Darier Disease.

Darier disease (DD), also known as Darier-White disease, follicular keratosis, or dyskeratosis follicularis, is an uncommon autosomal dominant genodermatosis with complete penetrance and variable expressivity. This disorder is caused by mutations in the ATP2A2 gene and affects the skin, nails, and mucous membranes (1,2). A 40-year-old woman, without comorbidities, presented with pruritic, unilateral skin lesions on the trunk since she was 37 years old. Lesions had remained stable since onset, with physical examination revealing tiny scattered erythematous to light brown keratotic papules beginning at the patient's abdominal midline, extending over her left flank and onto her back (Figure 1, a, b). No other lesions were observed, and family history was negative. Skin punch biopsy revealed parakeratotic and acanthotic epidermis with foci of suprabasilar acantholysis and corps ronds in the stratum spinosum (Figure 2, a, b, c). Based on these findings, the patient was diagnosed with segmental DD - localized form type 1. DD usually develops between the ages of 6 and 20 and is characterized by keratotic, red to brown, sometimes yellowish, crusted, pruritic papules in a seborrheic distribution (3,4). Nail abnormalities, alternating red and/or white longitudinal bands, fragility, and subungual keratosis can be present. Mucosal whitish papules and palmoplantar keratotic papules are also frequently observed. Insufficient function of the ATP2A2 gene that encodes for the sarco/endoplasmic reticulum Ca2+ ATPase type 2 (SERCA2) leads to calcium dyshomeostasis, loss of cellular adhesion, and characteristic histological findings of acantholysis and dyskeratosis. The main pathological finding is the presence of two types of dyskeratotic cells, "corps ronds", present in the Malpighian layer, and "grains", mostly located in the stratum corneum (1). Approximately 10% of cases present as the localized form of disease, with two phenotypes of segmental DD having been observed. The more common, type 1, is characterized by a unilateral distribution along Blaschko's lines with normal surrounding skin, whereas the type 2 variant presents with generalized disease and localized areas of increased severity. Although generalized DD is associated with nail and mucosal involvement, as well as positive family history, these findings are rarely seen in localized forms (1). Family members with identical ATP2A2 mutations may have notable differences in clinical manifestations of the disease (5). DD is usually a chronic disease with reccurent exacerbations. Exacerbating factors include sun exposure, heat, sweat, and occlusion (2). Infection is a common complication (1). Associated conditions include neuropsychiatric abnormalities and squamous cell carcinoma (6,7). Increased risk of heart failure has also been observed (8). Type 1 segmental DD may be clinically and histologically hard to distinguish from acantholytic dyskeratotic epidermal nevus (ADEN). Age of onset plays an important role in differentiation, as ADEN is often congenital (3). However, some studies suggest ADEN is a localized form of DD (1). Other differential diagnoses include herpes zoster, lichen striatus, lichen planus (4), severe seborrheic dermatitis, and Grover disease. Our patient was treated with a topical retinoid, for the first two weeks in combination with a topical corticosteroid. She was advised on the use of proper daily skincare with antimicrobial cleansers and emollients, as well as behavioral measures such as avoiding triggering factors and wearing light clothing, resulting in substantial clinical improvement (Figure 1, c, d) and amelioration of pruritus. Other treatment options include salicylic and lactic acid as well as topical 5-fluorouracil, while oral retinoids are reserved for more severe disease (1-3). Doxycycline and pulsed dye laser have also been reported to be effective (2,9). One in vitro study showed that COX-2 inhibitors may reinstitute the dysregulated ATP2A2 gene (4). In summary, DD is a rare keratinization disorder that can present in a generalized or localized pattern. Although uncommon, segmental DD should be included in the differential diagnosis of dermatoses that follow Blaschko's lines. Treatment options include various topical and oral treatments, depending on disease severity.

Darier disease, radiation therapy, and herpesvirus -- an unfortunate triad.

Darier disease (DD) is a rare autosomal dominant keratinizing disorder often characterized by brown scaly pruritic papules over the face, neck, and trunk. Herein is reported a patient who developed secondary cutaneous herpes simplex virus (HSV) following exacerbation of his DD as a result of radiation therapy. In November 2020, a 78-year-old man presented to clinic for a pruritic rash on his back consistent with DD. He had developed the rash after the conclusion of chemoradiation therapy for recently diagnosed urothelial carcinoma of the bladder with squamous differentiation. However, he returned two weeks later complaining of a marked worsening of the rash associated with a pain and burning sensations. Histopathology was non-conclusive, but the lesions were found to be positive for HSV-1 by PCR. The patient recovered without complication over a period of two weeks following a course of valacyclovir. There is precedent in the literature for ionizing radiation inducing flares of DD lesions in overlying skin. In addition, DD has been shown to put a patient at increased risk for secondary infections such as HSV. This case report demonstrates that HSV could pose a significant risk to those with DD receiving radiation therapy and thus could warrant prophylactic treatment.