Gordon Holmes syndrome

What it is, symptoms and effects

From: MedlinePlus Genetics, National Library of Medicine

Gordon Holmes syndrome is a rare condition characterized by reproductive and neurological problems. One of the key features of the condition is reduced production of hormones that direct sexual development (hypogonadotropic hypogonadism). Many affected individuals have a delay in development of the typical signs of puberty, such as the growth of facial hair and deepening of the voice in males, and the start of monthly periods (menstruation) and breast development in females. Some never undergo puberty. While some people with Gordon Holmes syndrome seem to have normal puberty, they develop other problems with the reproductive system later in life.

In early adulthood, individuals with Gordon Holmes syndrome develop neurological problems, usually beginning with speech difficulties (dysarthria). As the condition worsens, affected individuals have problems with balance and coordination (cerebellar ataxia), often leading to difficulties with activities of daily living and a need for wheelchair assistance. Some affected individuals also develop memory problems and a decline in intellectual function (dementia).

Causes and biological mechanisms

From: MedlinePlus Genetics, National Library of Medicine

Gordon Holmes syndrome can be caused by mutations in the RNF216 or PNPLA6 gene. Some people with the condition do not have mutations in these genes, indicating that mutations in other genes are likely involved in the condition.

The protein produced from the RNF216 gene is involved in a cellular process, called ubiquitination, by which unneeded proteins are tagged with a molecule called ubiquitin. The ubiquitin tag signals for the protein to be broken down. One of several proteins tagged by RNF216 is a protein found in nerve cells (neurons) that plays a role in a process called synaptic plasticity. Synaptic plasticity is the ability of the connections between neurons (synapses) to change and adapt over time in response to experience. This process is critical for learning and memory.

RNF216 gene mutations impair the ability of the RNF216 protein to tag unneeded proteins to be broken down. Impaired breakdown of the neuronal protein disrupts normal synaptic connections and plasticity, which likely contributes to dementia in people with Gordon Holmes syndrome. It is unclear how a lack of RNF216 protein function causes hypogonadotropic hypogonadism or cerebellar ataxia.

The PNPLA6 gene provides instructions for making a protein called neuropathy target esterase (NTE), which helps regulate the amount of certain fats (lipids) that make up the outer membrane surrounding cells. The correct levels of these lipids are critical to the stability and function of cell membranes. NTE is found most abundantly in the nervous system and is thought to help maintain the stability of membranes surrounding neurons. NTE is also thought to play a role in the release of hormones from the pituitary gland, a process that requires particular changes in the cell membrane. The pituitary gland is located at the base of the brain and produces several hormones, including those that help direct sexual development and growth.

PNPLA6 gene mutations are thought to impair NTE's function. Researchers speculate that such an impairment alters the balance of lipids in the cell membrane. This imbalance may damage neurons in the brain, causing cerebellar ataxia, and impair the pituitary gland's release of hormones involved in sexual development, leading to hypogonadotropic hypogonadism. Individuals with Gordon Holmes syndrome caused by PNPLA6 gene mutations do not appear to develop dementia.

Inheritance and family implications

From: MedlinePlus Genetics, National Library of Medicine

This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.

How common is it?

From: MedlinePlus Genetics, National Library of Medicine

Gordon Holmes syndrome is a rare condition. Its prevalence is unknown.

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.

Abnormal electroretinogram · Very frequent (99-80%)

Any abnormality of the electrical responses of various cell types in the retina as measured by electroretinography.

Abnormality of retinal pigmentation · Very frequent (99-80%)

Any deviation from the normal pigmentation of the retina.

Abnormality of speech or vocalization · Very frequent (99-80%)

An abnormality in the sound (volume) or cadence (rate) of speech.

Abnormality of the hypothalamus-pituitary axis · Very frequent (99-80%)

Abnormality of the pituitary gland (also known as hypophysis), which is an endocrine gland that protrudes from the bottom of the hypothalamus at the base of the brain. The pituitary gland secretes the hormones ACTH, TSH, PRL, GH, endorphins, FSH, LH, oxytocin, and antidiuretic hormone. The secretion of hormones from the anterior pituitary is under the strict control of hypothalamic hormones, and the posterior pituitary is essentially an extension of the hypothalamus, so that hypothalamus and pituitary gland may be regarded as a functional unit.

Ataxia · Very frequent (99-80%)

Ataxia refers to impaired coordination of voluntary muscle movement. Cerebellar ataxia refers to ataxia due to dysfunction of the cerebellum. This causes a variety of elementary neurological deficits including asynergy (lack of coordination between muscles, limbs and joints), dysmetria (lack of ability to judge distances that can lead to under- or overshoot in grasping movements), and dysdiadochokinesia (inability to perform rapid movements requiring antagonizing muscle groups to be switched on and off repeatedly).

Gynecomastia · Very frequent (99-80%)

Abnormal development of large mammary glands in males resulting in breast enlargement.

Hypogonadism · Very frequent (99-80%)

A decreased functionality of the gonad.

Hypogonadotropic hypogonadism · Very frequent (99-80%)

Hypogonadotropic hypogonadism is characterized by reduced function of the gonads (testes in males or ovaries in females) and results from the absence of the gonadal stimulating pituitary hormones: follicle stimulating hormone (FSH) and luteinizing hormone (LH).

Other findings in the same source

From: Orphanet

Additional reported features include Nystagmus (Very frequent (99-80%)); Optic atrophy (Very frequent (99-80%)); Decreased fertility (Very frequent (99-80%)); Hemiplegia/hemiparesis (Frequent (79-30%)); Hypotonia (Frequent (79-30%)); Atypical behavior (Occasional (29-5%)); Brachycephaly (Occasional (29-5%)); Clinodactyly of the 5th finger (Occasional (29-5%)); Dementia (Occasional (29-5%)); Personality changes (Occasional (29-5%)). This is a selected summary, not a complete description of the condition.

Which doctor should you see?

The suggested department for discussing Gordon Holmes syndrome is Neurology, with a neurologist 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.

• Which nervous-system findings help explain the symptoms?
• Would an assessment of walking, communication or daily function be helpful?
• Are rehabilitation or other specialist services relevant?

Treatment discussions and follow-up

The material gathered for this draft does not provide a complete condition-specific treatment pathway for Gordon Holmes syndrome. 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.