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Goltz syndrome (focal dermal hypoplasia)
This complex condition typically affects multiple body systems, leading to distinctive skin changes, bone and limb abnormalities, and eye problems. It is more commonly observed in females, often due to its X-linked dominant inheritance pattern.
Overview
Goltz syndrome, sometimes called focal dermal hypoplasia, is a rare genetic disorder affecting the development of tissues throughout the body [PMID:33678096]. It is named after Dr. Robert Goltz, who first described the condition in detail. The syndrome is characterised by a wide range of signs and symptoms, which can vary significantly between individuals. Key features typically involve the skin, bones, and eyes, but other organs can also be affected [PMID:31536779].
This condition is part of a group of disorders known as ectodermal dysplasias, which affect tissues that develop from the embryonic ectoderm (the outermost layer of cells in the early embryo). These tissues include the skin, hair, teeth, nails, and sweat glands, as well as some parts of the nervous system and eyes. Because Goltz syndrome affects multiple systems, a coordinated approach to care is generally needed.
Symptoms & clinical features
The symptoms of Goltz syndrome are diverse and can affect various parts of the body. Skin manifestations are a hallmark of the condition: individuals often have areas where the skin is thin, resembling parchment, or has not developed fully (dermal hypoplasia). These affected areas may appear as yellow-pink lesions or streaks, and fat can bulge through the thinned skin, creating a 'hernial' appearance [PMID:31536779]. Some individuals also experience growths of fatty tissue that feel like soft bumps under the skin.
Skeletal abnormalities are common and can include missing fingers or toes (oligodactyly), fusion of digits (syndactyly), or bone asymmetry. Spinal curvature (scoliosis) and changes in collarbone or skull development may also be present. Dental problems are frequent, such as missing teeth (agenesis), small teeth (microdontia), or unusually shaped teeth. Eye abnormalities can range from small or missing eyes (microphthalmia/anophthalmia), colobomas (gaps in structures of the eye), to issues with tear ducts, which can affect vision. Other potential features include hair abnormalities like sparse or brittle hair, and occasionally, heart or kidney issues.
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Affected organs
Goltz syndrome predominantly affects tissues derived from the ectoderm and mesoderm, leading to a broad spectrum of involvement across body systems. The skin is typically affected, with areas of focal dermal hypoplasia, fat herniation, and pigment changes. The skeletal system often shows significant involvement, including abnormalities of the limbs, spine, and ribs. The eyes are frequently affected, with potential for colobomas, strabismus, and microphthalmia.
Teeth are also commonly involved, with observations such as abnormal shape, size, or number. Hair may be sparse or subject to abnormal growth patterns. While less common, internal organs such as the heart, kidneys, and gastrointestinal tract can also be affected in some individuals, underscoring the systemic nature of the condition.
Risks & severity
The severity of Goltz syndrome can vary significantly, even within the same family. Some individuals may have mild symptoms, while others experience more severe and widespread health challenges. Due to the wide range of possible manifestations, the lifetime risks associated with Goltz syndrome are diverse. For example, severe eye involvement can lead to significant visual impairment, and extensive skeletal abnormalities may impact mobility and physical development.
Certain complications, such as cardiac or renal anomalies, can lead to more serious health concerns requiring specialised medical attention. The age of onset for symptoms is generally at birth or in early childhood, as many features are congenital. However, some aspects, like dental issues or progressive skeletal changes, may become more apparent as a child grows.
Genetic causes
Goltz syndrome is caused by pathogenic changes in the PORCN gene. The PORCN gene provides instructions for making a protein called Porcupine O-acyltransferase. This protein plays a crucial role in a cell signalling pathway known as the Wnt pathway [PMID:33678096]. The Wnt pathway is essential for normal embryonic development, influencing how cells grow, divide, and differentiate into specific tissues.
Pathogenic variants in PORCN disrupt the normal function of the Porcupine protein, leading to malfunctioning Wnt signalling. This disruption in signalling during development is thought to underlie the wide range of abnormalities seen in the skin, bones, eyes, and other organs in individuals with Goltz syndrome. The exact severity and combination of symptoms depend on how profoundly the Wnt pathway is affected by the specific genetic change.
Inheritance pattern
Goltz syndrome follows an X-linked dominant inheritance pattern. This means the gene responsible (PORCN) is located on the X chromosome, and only one copy of a pathogenic variant is sufficient to cause the condition. Since females have two X chromosomes, and males have one X and one Y chromosome, this inheritance pattern affects genders differently.
Females with a pathogenic variant on one X chromosome typically show the full range of symptoms, though sometimes their symptoms can be more variable due to a process called X-inactivation. For males, having only one X chromosome means a single pathogenic variant usually leads to more severe symptoms and can often be lethal during embryonic development, which is why most affected individuals who survive are female. Rarely, males can survive with Goltz syndrome, often due to mosaicism, where only some cells carry the pathogenic variant. An affected parent has a 50% chance of passing the pathogenic variant to each child.
X-linked dominant: all daughters of an affected father inherit the altered X and are affected. Sons receive the father's Y and are unaffected.
Diagnosis & testing
Diagnosing Goltz syndrome typically begins with a clinical evaluation based on the distinctive physical features, particularly the characteristic skin, skeletal, and eye abnormalities. However, since the symptoms can vary, genetic testing is often used to confirm the diagnosis. Genetic testing for Goltz syndrome involves looking for pathogenic variants in the PORCN gene.
Referral to a clinical genetics service is the common pathway for individuals suspected of having Goltz syndrome. Genetic testing for this condition in the UK would typically fall under the NHS National Genomic Test Directory, potentially aligning with relevant R-codes for rare disease testing. A clinical geneticist or genetic counsellor would arrange appropriate testing and discuss the implications of a diagnosis for the individual and their family.
Management & lifestyle
Managing Goltz syndrome generally involves a multidisciplinary approach due to the varied and systemic nature of the condition. Treatment focuses on addressing specific symptoms and improving quality of life, as there is currently no cure. This may include regular monitoring by specialists such as dermatologists for skin issues, orthopaedic surgeons for skeletal abnormalities, and ophthalmologists for eye problems.
Dental care is often a significant part of management, addressing issues like missing or malformed teeth. Physical therapy and occupational therapy may be recommended to help with mobility and daily living. Individuals and their families receive support from clinical genetics teams and genetic counsellors, who provide information about the condition, discuss inheritance patterns, and help coordinate care. All management decisions are made in consultation with healthcare professionals to best suit the individual's needs.
UK care pathway
In the UK, individuals suspected of having Goltz syndrome would typically be referred to a Clinical Genetics service. This service can provide a comprehensive assessment, arrange appropriate genetic testing through the NHS Genomic Medicine Service (GMS), and offer genetic counselling. The tests performed would be aligned with the NHS National Genomic Test Directory, which uses specific R-codes for different conditions, ensuring an evidence-based approach to genomic diagnosis. Genetic counsellors play a vital role in explaining the condition, its inheritance, and the implications of a diagnosis for the wider family.
Frequently asked questions
Is Goltz syndrome more common in boys or girls?
Goltz syndrome is much more commonly observed in females. This is because it is an X-linked dominant condition, and severe forms can often be lethal for males during development, with most surviving males being mosaic for the condition.
What kind of doctor treats Goltz syndrome?
Managing Goltz syndrome typically requires a team of specialists, including dermatologists for skin issues, orthopaedic surgeons for bone problems, ophthalmologists for eye care, and dentists. A clinical geneticist often coordinates care.
Can Goltz syndrome be passed down in families?
Yes, Goltz syndrome is a genetic condition that follows an X-linked dominant inheritance pattern. An affected parent has a 50% chance of passing the genetic change to each of their children.
Are there support groups for people with Goltz syndrome?
While Goltz syndrome is rare, patient support organisations focusing on rare diseases or ectodermal dysplasias may offer resources and connections for affected individuals and their families. Your genetic counsellor might be able to suggest specific groups.
What is the long-term outlook for someone with Goltz syndrome?
The long-term outlook varies greatly depending on the severity of symptoms in each individual. With appropriate multidisciplinary care focused on managing specific symptoms, many individuals can lead fulfilling lives. Regular medical follow-ups are important.
References
- Happle R. Goltz syndrome and PORCN: A view from Europe. American journal of medical genetics. Part C, Seminars in medical genetics. 2016. PMID: 26799923
- Duggal R, Butcher CJ, Fete MD. Ectodermal dysplasia and cholesteatoma: A cross-sectional analysis of otologic issues. International journal of pediatric otorhinolaryngology. 2024. PMID: 39025035
- Tenkir A, Teshome S. Goltz syndrome (focal dermal hypoplasia) with unilateral ocular, cutaneous and skeletal features: case report. BMC ophthalmology. 2010. PMID: 21092077
- Ko CJ, Antaya RJ, Zubek A. Revisiting histopathologic findings in Goltz syndrome. Journal of cutaneous pathology. 2016. PMID: 26956940
- Lasocki AL, Stark Z, Orchard D. A case of mosaic Goltz syndrome (focal dermal hypoplasia) in a male patient. The Australasian journal of dermatology. 2011. PMID: 21332693
- Krishnan D, Choo KE. Goltz syndrome: focal dermal hypoplasia. The Journal of the Singapore Paediatric Society. 1983. PMID: 6632814
- Boothroyd AE, Hall CM. The radiological features of Goltz syndrome: focal dermal hypoplasia. A report of two cases. Skeletal radiology. 1988. PMID: 3201278
- Seven M, Suyugül Z, Yüksel A. A family presenting Goltz syndrome (focal dermal hypoplasia) in three generations. The Turkish journal of pediatrics. 1998. PMID: 10028871