Geleophysic dysplasia

What it is, symptoms and effects

From: MedlinePlus Genetics, National Library of Medicine

Geleophysic dysplasia is an inherited condition that is characterized by short stature, thickened skin, joint abnormalities, distinctive facial features, and heart (cardiac) problems. The features and the severity of geleophysic dysplasia can vary among affected individuals.

People with geleophysic dysplasia have short stature with especially small hands and feet. A thickening of the skin combined with joint deformities (contractures) can limit movement in the joints, especially in the fingers and wrists. Contractures in the legs and hips may cause people with geleophysic dysplasia to walk on their toes. The joint abnormalities seen in affected individuals typically worsen over time.

Geleophysic dysplasia gets its name from the Greek words for happy ("gelios") and nature ("physis") and is derived from the good-natured facial appearance seen in many affected individuals. The distinctive facial features that are associated with this condition include a round face with full cheeks, a small nose with upturned nostrils, a broad nasal bridge, a thin upper lip, upturned corners of the mouth, and a flattened area between the upper lip and the nose (philtrum).

People with geleophysic dysplasia often have cardiac problems. Abnormalities of the valves that control the flow of blood through the heart (cardiac valves) are especially common. In affected individuals, the cardiac valves may thicken, which can block blood flow and increase pressure in the heart. These cardiac valve problems can worsen over time. In some cases, people with geleophysic dysplasia have a narrowing of the artery from the heart to the lungs (pulmonary stenosis) or a hole between the two upper chambers of the heart (atrial septal defect).

Approximately one third of individuals with geleophysic dysplasia have an abnormality of the windpipe (trachea) or voice box (larynx) that can cause serious breathing problems. These airway problems can also worsen over time. Some affected individuals have recurrent respiratory infections. About one third of people with geleophysic dysplasia do not survive past early childhood due to serious cardiac or respiratory problems.

Other features of geleophysic dysplasia can include an enlarged liver (hepatomegaly) and recurrent ear infections, which can lead to hearing loss in some affected individuals.

Causes and biological mechanisms

From: MedlinePlus Genetics, National Library of Medicine

Variants (also called mutations) in multiple genes can cause geleophysic dysplasia. Variants in the ADAMTSL2 and FBN1 genes are the most common causes of this condition.

The ADAMTSL2 and FBN1 genes provide instructions for making proteins that are found in the extracellular matrix, which is the intricate lattice of proteins and other molecules that forms in the spaces between cells. Within the extracellular matrix, the ADAMTSL2 and FBN1 proteins appear to be involved with the microfibrillar network, which is an organized arrangement of thread-like filaments (microfibrils) that allows tissues to be strong and flexible.

Although the exact function of the ADAMTSL2 protein is unclear, studies suggest that it may help the FBN1 protein maintain the microfibrillar network. These proteins also appear to regulate the availability of certain growth factor proteins within the microfibrillar network. These growth factors play a key role in cell growth and division (proliferation), the process by which cells mature to carry out specific functions (differentiation), and cell survival.

Variants in the ADAMTSL2 and FBN1 genes cause cells to produce proteins that do not function properly. Through a poorly understood process, these altered proteins disrupt the organization of the microfibrillar network in various tissues, which impairs normal cell functioning. The altered proteins also impair the activity of certain growth factors. Researchers are working to learn exactly how variants in these two genes lead to the specific signs and symptoms seen in people with geleophysic dysplasia.

Inheritance and family implications

From: MedlinePlus Genetics, National Library of Medicine

Geleophysic dysplasia is inherited in different ways depending on the particular gene involved.

When geleophysic dysplasia is caused by variants in the FBN1 gene, it is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder. Some cases of geleophysic dysplasia result from new (de novo) variants in the gene that occur during the formation of reproductive cells (eggs or sperm) in an affected individual's parent or during early embryonic development.

When geleophysic dysplasia is caused by variants in the ADAMTSL2 gene, it is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell must have a variant to cause the disorder. The parents of an individual with an autosomal recessive condition each carry one copy of the altered gene, but they typically do not show signs and symptoms of the condition.

How common is it?

From: MedlinePlus Genetics, National Library of Medicine

Geleophysic dysplasia is a rare disorder. Although the exact number of people with this condition is unknown, more than 100 affected individuals have been reported in the medical literature.

Reported clinical features and what the terms mean

The following findings are associated with this condition in Orphanet. They are not a checklist for diagnosing yourself, and they do not all occur in every affected person. Some are examination, imaging or laboratory findings that cannot be recognised at home.

The frequency labels describe how often a finding was reported among people with the condition in the source. They do not give the chance that a person with that symptom has the condition. Definitions below reproduce HPO terminology; they explain the term, not the likely severity in an individual.

Short stature · Very frequent (99-80%)

A height below that which is expected according to age and gender norms. Although there is no universally accepted definition of short stature, many refer to "short stature" as height more than 2 standard deviations below the mean for age and gender (or below the 3rd percentile for age and gender dependent norms).

Airway obstruction · Frequent (79-30%)

Obstruction of conducting airways of the lung.

Anteverted nares · Frequent (79-30%)

Anteriorly-facing nostrils viewed with the head in the Frankfurt horizontal and the eyes of the observer level with the eyes of the subject. This gives the appearance of an upturned nose (upturned nasal tip).

Asthma · Frequent (79-30%)

Asthma is characterized by increased responsiveness of the tracheobronchial tree to multiple stimuli, leading to narrowing of the air passages with resultant dyspnea, cough, and wheezing.

Brachydactyly · Frequent (79-30%)

Digits that appear disproportionately short compared to the hand/foot. The word brachydactyly is used here to describe a series distinct patterns of shortened digits (brachydactyly types A-E). This is the sense used here.

Conductive hearing impairment · Frequent (79-30%)

An abnormality of vibrational conductance of sound to the inner ear leading to impairment of sensory perception of sound.

Delayed skeletal maturation · Frequent (79-30%)

A decreased rate of skeletal maturation. Delayed skeletal maturation can be diagnosed on the basis of an estimation of the bone age from radiographs of specific bones in the human body.

Elevated pulmonary artery pressure · Frequent (79-30%)

An abnormally elevated blood pressure in the circulation of the pulmonary artery.

Other findings in the same source

From: Orphanet

Additional reported features include Increased size of nasopharyngeal adenoids (Frequent (79-30%)); Intrauterine growth retardation (Frequent (79-30%)); Joint contracture (Frequent (79-30%)); Limitation of joint mobility (Frequent (79-30%)); Long philtrum (Frequent (79-30%)); Phalangeal cone-shaped epiphyses (Frequent (79-30%)); Polyhydramnios (Frequent (79-30%)); Recurrent ear infections (Frequent (79-30%)); Round face (Frequent (79-30%)); Short fetal femur length (Frequent (79-30%)). This is a selected summary, not a complete description of the condition.

Which doctor should you see?

The suggested department for discussing Geleophysic dysplasia is Orthopaedics, with a orthopaedic specialist as the relevant type of clinician. General physician / Family Medicine; paediatrician for children. Referral depends on symptoms.

Additional services that may be relevant, depending on the findings, include: Clinical Genetics.

This is an editorial referral starting point. The appropriate clinic depends on the person’s age, symptoms, previous diagnosis and local services. The first clinician can decide whether another specialty or a team is needed; a department label does not confirm the diagnosis.

How to prepare for an assessment

Bring a short timeline of the main symptoms: when they first appeared, whether they are constant or episodic, what seems to change them, and how they affect daily activities. Include previous reports, discharge summaries, current medicines and supplements, allergies, and any relevant family history. A dated record is more useful than trying to match every feature in an online article.

Ask the clinician what is already established and what remains uncertain. If a test is suggested, ask what question it answers, what its limitations are and how the result would change the next step. The information here is not an instruction to arrange every possible test. In children, bring growth, developmental and school information if it is relevant to the concern.

• What explains the change in pain, movement or function?
• Which activities need adjustment while the diagnosis is being clarified?
• What are the roles of rehabilitation, observation and surgery in this situation?

Treatment discussions and follow-up

The material gathered for this draft does not provide a complete condition-specific treatment pathway for Geleophysic dysplasia. That gap does not mean that treatment is unavailable. A clinician needs to establish the diagnosis and review current guidance before recommending medicines, procedures, rehabilitation or other support.

Before leaving the appointment, clarify the next review date, who will communicate results, and whom to contact if the situation changes. Discuss difficulties with sleep, work, school, mobility, eating or emotional wellbeing when these are relevant. Practical support may require coordination between the treating clinician and other services.

The collected references do not establish a complete prevention or long-term outlook section for this entry. Missing information should not be interpreted as proof that prevention is impossible or that a particular outcome is inevitable. Ask what is known for the exact subtype, stage and personal circumstances, and which uncertainties remain.

When to seek emergency help

Severe breathing difficulty, collapse, new stroke-like symptoms, a seizure that is prolonged or repeated without recovery, uncontrolled major bleeding, or an immediate risk of self-harm require emergency help. In India, call 112 or reach the nearest emergency department. This is a general, non-exhaustive warning list; it is not a condition-specific triage tool.