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Darier disease
This condition results from changes in the ATP2A2 gene, affecting calcium signalling in skin cells. It leads to rough, warty patches and can impact quality of life, typically appearing in adolescence.
Overview
Darier disease, also known as keratosis follicularis, is a genetic skin condition that primarily affects the skin, nails, and sometimes the mucous membranes. It is characterised by the development of greasy, crusted, wart-like bumps and plaques, often in areas prone to friction such or where skin folds [PMID:33671887]. The condition typically emerges during adolescence, though it can appear earlier or later in life. Its severity can vary significantly among affected individuals, even within the same family [PMID:24074211].
The precise prevalence of Darier disease is not well established, but estimates suggest it affects approximately 1 in 30,000 to 1 in 100,000 people in the general population. It affects people of all sexes and ethnic backgrounds equally. The impact on daily life can range from mild cosmetic concerns to significant discomfort, including itching, pain, and a predisposition to skin infections.
Symptoms & clinical features
The main clinical features of Darier disease include characteristic skin lesions. These often begin as small, flesh-coloured or yellowish-brown bumps which can gradually become larger, rougher, and may merge into plaques. These lesions typically have a greasy or warty appearance and may be foul-smelling, particularly if they become infected [PMID:33671887]. Common sites for these lesions include the chest, back, neck, scalp, forehead, and areas with skin folds such as the armpits and groin.
Nail changes are also a common symptom, presenting as longitudinal streaks, splits, or V-shaped nicks at the end of the nails. Sometimes, punctate keratoses (small, hard bumps) can be found on the palms and soles. In some cases, white, cobblestone-like papules may develop on the mucous membranes, such as in the mouth or genital area. The symptoms tend to worsen with exposure to heat, humidity, sunlight, and friction.
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Affected organs
Darier disease predominantly affects the skin, where the primary lesions develop due to abnormal keratinocyte (skin cell) adhesion. The nails are almost universally affected, showing various characteristic changes. Oral and genital mucous membranes can also be involved, though this is less common than skin and nail manifestations. In rare instances, there might be associations with certain neurological or psychiatric conditions, though the direct causal link is still an area of research.
Risks & severity
The severity of Darier disease can vary widely, even among individuals with the same genetic change. Some people experience only mild symptoms with limited skin involvement, while others develop extensive and disfiguring lesions that can significantly impact their quality of life. Symptoms typically begin in adolescence or early adulthood, although onset can occur at any age from childhood to later in life.
Complications can include secondary bacterial or fungal infections of the skin lesions, which can lead to increased pain, itching, and malodour. In some individuals, the lesions may become more extensive or resistant to treatment over time. While not a life-threatening condition, chronic discomfort and cosmetic concerns can lead to psychological distress. There is no increased risk of skin cancer associated with Darier disease itself.
Genetic causes
Darier disease is caused by pathogenic variants in the ATP2A2 gene. This gene provides instructions for making a protein called sarco/endoplasmic reticulum calcium ATPase 2 (SERCA2). SERCA2 is a calcium pump, meaning it is responsible for transporting calcium ions within cells, particularly into a structure called the endoplasmic reticulum.
In skin cells (keratinocytes), proper calcium signalling is critical for cell-to-cell adhesion and the process of keratinisation, where cells mature and form the protective outer layer of the skin. Pathogenic changes in the ATP2A2 gene disrupt the function of the SERCA2 protein. This impaired calcium transport interferes with cell adhesion molecules and affects cellular processes, leading to the abnormal development and detachment of keratinocytes that is characteristic of Darier disease [PMID:24074211].
- ATP2A2 ATPase sarcoplasmic/endoplasmic reticulum Ca2+ transporting 2
Inheritance pattern
Darier disease is inherited in an autosomal dominant pattern. This means that an individual only needs one copy of the altered ATP2A2 gene to develop the condition. If a parent has Darier disease, there is a 50% chance with each pregnancy that their child will also inherit the condition, regardless of the child's sex. This is because the gene is located on a non-sex chromosome (autosome) and a single altered copy is sufficient to cause the disease. The condition can also result from a new (de novo) genetic change in individuals with no family history.
Each child has a 50% chance of inheriting the pathogenic variant, regardless of sex.
Diagnosis & testing
Diagnosis of Darier disease is primarily based on characteristic clinical findings of the skin and nail changes. A skin biopsy, where a small tissue sample is taken and examined under a microscope, can confirm the diagnosis by revealing typical microscopic features, such as suprabasal acantholysis (loss of cohesion between skin cells) and dyskeratosis (abnormal keratinisation).
Genetic testing for pathogenic variants in the ATP2A2 gene can confirm the diagnosis, especially in atypical cases or when there is uncertainty. Genetic testing for Darier disease falls under the NHS Genomic Medicine Service (GMS) pathways, referenced by related R-codes. Referral to a clinical genetics service is typically made by a dermatologist if a genetic diagnosis is required. Genetic counsellors can provide further information about the inheritance pattern and implications for family members.
Management & lifestyle
While there is currently no cure for Darier disease, various treatments aim to manage symptoms and improve quality of life. Treatment strategies are tailored to the individual and depend on the severity of symptoms. Topical treatments, such as moisturisers, corticosteroids, and retinoids (e.g., tazarotene or adapalene), can help to soften lesions, reduce inflammation, and normalise skin cell growth [PMID:33671887].
For more severe cases, systemic medications like oral retinoids (e.g., acitretin or isotretinoin) may be prescribed, which can be effective but require careful monitoring due to potential side effects. Antibiotics or antifungal medications may be used to treat secondary infections. Avoiding triggers like heat, humidity, and excessive sun exposure can also help to minimise flare-ups. Regular follow-up with a dermatologist is typically part of the management plan.
UK care pathway
In the UK, individuals with suspected genetic conditions like Darier disease are typically referred to specialist services within the NHS. This often begins with assessment by a dermatologist who may then recommend a referral to a clinical genetics service. These services offer genetic testing, counselling, and help in navigating the Genomic Medicine Service (GMS) pathways, which include specific R-codes for genetic testing panels. Genetic counsellors play a vital role in providing information about the condition, its inheritance, and support for affected individuals and their families.
Frequently asked questions
Is Darier disease contagious?
No, Darier disease is a genetic condition caused by an altered gene, not by an infection. It cannot be passed from person to person through contact.
Can Darier disease symptoms get worse over time?
The severity of Darier disease can vary throughout an individual's life. Symptoms may worsen in response to certain triggers like heat, humidity, or friction, and the overall extent of lesions can sometimes progress.
Are there specific triggers I should avoid with Darier disease?
Many individuals with Darier disease find that their symptoms are aggravated by heat, humidity, sun exposure, and friction. Avoiding these triggers where possible, and using sun protection, may help manage the condition.
If I have Darier disease, will my children get it?
Darier disease is inherited in an autosomal dominant pattern. This means if you have the condition, each of your children has a 50% chance of inheriting the altered gene and developing Darier disease.
Will diet changes help improve Darier disease?
Currently, there is no strong evidence to suggest that specific diet changes can cure or significantly improve Darier disease. However, maintaining a generally healthy lifestyle is always recommended for overall well-being.
References
- Redondo Mateo J. On Darier Disease: A Case Series of 20 Patients and Review of the Literature. Actas dermo-sifiliograficas. 2022. PMID: 35623738
- Takagi A, Kamijo M, Ikeda S. Darier disease. The Journal of dermatology. 2016. PMID: 26945535
- Schmieder SJ, Sathe NC, Rosario-Collazo JA. Darier Disease. 2023. PMID: 30137841
- Korman AM, Milani-Nejad N. Darier Disease. JAMA dermatology. 2020. PMID: 32785629
- Lee RRS, Cai SCS, Chia HY. Persistent perianal "warts". JAAD case reports. 2022. PMID: 35242960
- McKinley TD, Maroon M. Linear Darier's Disease. The New England journal of medicine. 2021. PMID: 34890176
- Bachar-Wikström E, Wikström JD. Darier Disease - A Multi-organ Condition? Acta dermato-venereologica. 2021. PMID: 33606037
- Thomas EW. Darier's Disease. Proceedings of the Royal Society of Medicine. 1944. PMID: 19992871