- How They Develop
- Jacobsen Syndrome
- Causes & Risk Factors
- What are the treatment options for Jacobsen syndrome?
- What are the treatment options for Noonan syndrome?
- What are the treatment options for Barber-Say syndrome?
- What are the treatment options for orbital hypertelorism?
- What are the treatment options for Moebius syndrome?
- What are the treatment options for wide eyes?
- Noonan Syndrome
- Barber-Say Syndrome
- Orbital Hypertelorism
- Moebius Syndrome
Wide eyes, also referred to as telecanthus, can be caused by a variety of factors, such as genetic disorders, neurological conditions, or craniofacial abnormalities. In addition, it can be caused by certain medical conditions or medications or even be a temporary side effect of certain emotions or situations.
The most common causes of telecanthus are birth defects and genetic disorders. The common birth defects that cause wide eyes include:
- Jacobsen syndrome
- Noonan syndrome
- Barber-Say syndrome
- Orbital hypertelorism
- Moebius syndrome
When referring to wide eyes, it typically means that the distance between the inner corners of the eyes (the medial canthi) is more than normal.
How do wide eyes develop?
During normal development, the inner corners of the eyes (medial canthi) are brought closer by the development of the frontonasal prominence.
- It is a protrusion at the front of the skull that forms the bridge of the nose.
- In various conditions, the frontonasal prominence does not form properly, resulting in the distance between the inner corners of the eyes (the medial canthi) being greater than normal, giving the appearance of the eyes being farther apart or more open than usual.
Also known as partial monosomy 11q or 11q deletion syndrome, it is a rare genetic disorder caused by partial deletion of the long arm of chromosome 11. This deletion results in the loss of several important genes for normal development and growth.
Jacobsen syndrome is characterized by a range of physical, developmental, and intellectual disabilities. Deletion affects many genes in Jacobsen syndrome; it can cause wide-set eyes (telecanthus) because of abnormal development of the skull.
What are the symptoms of Jacobsen syndrome?
Jacobsen syndrome leads to various developmental abnormalities and the most distinctive features are wide eyes, a small head (microcephaly), a small jaw (micrognathia), a long face, and a curved fifth finger.
Other abnormalities include:
- Droopy eyes
- Thin upper lip
- Skeletal abnormalities
- Short stature caused by a delay in the growth of the long bones
- Broad nasal bridge
- Congenital heart defects
- Septal defect
- Valvular disease
- Blocked blood vessel
- Bleeding problems
- Heavy menstrual periods
- Developmental delays
- Cognitive impairment
- Learning difficulties
- Blurred vision or vision loss
- Small, low-set ears
- Hearing loss
- Kidney problems
- Behavioral and psychological issues
What are the causes and risk factors for Jacobsen syndrome?
Jacobsen syndrome, also known as 11q deletion syndrome, is caused by partial deletion of the long arm of chromosome 11. Several genes that are crucial for normal development and growth are lost.
The deletion typically occurs as a random event during the formation of eggs or sperm and is usually not an inherited condition. Individuals with Jacobsen syndrome have one normal copy and one deleted copy of the affected chromosome in each cell.
Risk factors for Jacobsen syndrome
There is no specific risk factor linked to Jacobsen syndrome; it is a sporadic disorder (occurs infrequently and irregularly). Jacobsen syndrome is a rare disorder, and having a family history or being of certain ethnicity does not necessarily mean that the person will develop the disorder.
What are the treatment options for Jacobsen syndrome?
There is no cure for Jacobsen syndrome, and treatment differs depending on the needs of the individual and is specific to the symptoms. Treatment may involve a combination of different specialists.
The following treatment options may be considered:
- Cardiology-related treatments: Individuals with Jacobsen syndrome often have congenital heart defects, and treatment may include surgery, medication, or other interventions to correct or manage these defects.
- Growth hormone therapy: May be given to some children to help increase their height.
- Physical therapy: May be recommended to help develop motor skills and facial muscle strengthening and prevent or correct scoliosis.
- Hearing aids or cochlear implants: If an individual has hearing loss, they may be fitted with hearing aids or a cochlear implant to improve hearing.
- Speech therapy: Is recommended to help with speech development and to correct a cleft palate.
- Genetic counseling: This can help individuals and families understand the inheritance pattern of Jacobsen syndrome and the risks of passing the disorder on to future generations.
- Medications: Some individuals may need to take blood-thinning medications to prevent blood clots and bleeding problems.
- Behavioral and psychological therapy: Some individuals may benefit from behavioral and psychological therapy to manage symptoms such as attention deficit hyperactivity disorder, autism, or anxiety disorder.
Noonan syndrome is a genetic disorder that affects many parts of the body. It is characterized by distinctive facial features, short stature, heart defects, and bleeding problems.
It is caused by mutations in several genes and is inherited in an autosomal dominant pattern, which means that an individual needs to inherit only one copy of the gene mutation from one parent to develop the condition. It can also occur due to a spontaneous mutation, which means no family history is involved.
One of the common features of Noonan syndrome is wide-set eyes (telecanthus), which are caused by abnormal development of the skull, particularly the bones around the eyes.
What are the symptoms of Noonan syndrome?
Noonan syndrome affects many parts of the body and its symptoms can vary widely, but common features include:
- Distinctive facial features
- A wide forehead
- A high and broad nasal bridge
- Down-slanting eyes
- Micrognathia (small jaws)
- Crooked teeth
- Arched palate
- The deep groove between the nose and mouth
- Short stature
- Short neck with excess skin folds
- The lower hairline at the back of the head
- Structural heart defects
- Bleeding issues
- Valve disorders
- Low birth weight
- Deformities of the spine, such as scoliosis
- Wide-set nipples
- Cognitive impairment
- Intellectual disability
- Skin that gets thinner with age
- Genitourinary abnormalities
- Undescended testicles
- Delayed puberty in both men and women
- Kidney issues
What are the causes and risk factors for Noonan syndrome?
Noonan syndrome is caused by mutations in several genes, which are inherited in an autosomal dominant pattern, which means the inheritance of only one copy of the gene mutation from one parent is enough to develop the condition. Moreover, Noonan syndrome can occur as a new mutation.
The most common genetic cause of Noonan syndrome is a mutation in the PTPN11 gene, which provides instructions for making a protein called SHP-2. This protein plays a role in cell signaling and growth, and the mutations in this gene can affect the normal functioning of this protein.
Other genes that have been identified as causes of Noonan syndrome include KRAS, RAF1, SOS1, CBL, NRAS, SHOC2, and MAP2K1. Mutations in these genes can affect the normal functioning of cell signaling pathways critical for normal development and growth.
Risk factors for Noonan syndrome
- Family history: Individuals who have a parent or sibling with Noonan syndrome have an increased risk of inheriting the disorder.
- New mutation: In some cases, Noonan Syndrome can occur as a new mutation, and there is no family history of the disorder.
- Gender: It is slightly more common in men.
- Ethnicity: This syndrome has been reported more in individuals of European descent.
What are the treatment options for Noonan syndrome?
The treatment options for Noonan syndrome can include the following:
- Correction of cardiac defects through surgery, medications, or other interventions
- Growth hormone therapy for children with short stature to improve height
- Hearing aids or cochlear implants to improve hearing
- Speech therapy
- Genetic counseling
- Physical therapy
- Medications, such as blood thinning agents to prevent bleeding issues
- Behavioral and psychological therapy to manage symptoms such as attention deficit hyperactivity disorder, autism, or anxiety disorder
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Barber-Say syndrome (BSS) is a rare genetic disorder that can be inherited in either an autosomal dominant or autosomal recessive pattern. In autosomal recessive inheritance, individuals inherit only one copy of the mutation. They do not develop the disorder but can pass the mutation on to their offspring, so they are known as carriers.
It affects the development of the craniofacial bones and the eyes. One of the common features of BSS is wide-set eyes (telecanthus), which is caused by abnormal development of the skull, particularly the bones around the eyes.
It also presents with facial asymmetry and a small lower jaw (micrognathia). The condition is caused by mutations in the TWIST2 gene, which is responsible for the production of a protein that plays a role in the development of the bones and muscles of the face and skull.
What are the symptoms of Barber-Say syndrome?
Barber-Say syndrome (BSS) is a rare genetic disorder characterized by a combination of craniofacial, dental, and skeletal abnormalities.
The symptoms of BSS can vary widely but common features include:
- Craniofacial abnormalities
- Microcephaly (a small head)
- Telecanthus (wide-set eyes)
- A triangular-shaped face
- Micrognathia (a small jaw)
- A high forehead
- Dental abnormalities
- Missing or abnormally shaped teeth
- Malocclusion (misalignment of the upper and lower jaws)
- Skeletal abnormalities
- Short stature
- Scoliosis (a curved spine)
- Abnormally shaped bones of the hands and feet
- Hearing loss caused by abnormal development of the inner ear
- Cleft palate
- Developmental delays
What are the causes and risk factors for Barber Say syndrome?
Barber-Say syndrome (BSS) is a rare genetic disorder caused by mutations in the TWIST2 gene.
The TWIST2 gene provides instructions for making a protein called twist-related protein 2 which plays a role in the development of the face, skull, and bones. The TWIST2 gene mutations can reduce the production of the protein or produces a nonfunctional protein. This results in abnormal development of the skull, face, teeth, jaw, bones, and other structures.
Risk factors for Barber Say syndrome
- Family history: Individuals with a parent or sibling with BSS have an increased risk of inheriting the disorder.
- Consanguinity: Individuals born to closely related parents (such as first cousins) have an increased risk of inheriting the disorder.
- Ethnicity: Individuals of Arabic descent are often reported with this syndrome.
- New mutation: In some cases, there is no family history of the disorder, and it occurs due to a new mutation.
What are the treatment options for Barber-Say syndrome?
There is no cure for Barber-Say syndrome (BSS) and the treatment provided is symptomatic.
The following treatment options may be considered:
- Craniofacial surgery: Surgery may be required to correct craniofacial abnormalities, such as a small jaw, a high forehead, or wide-set eyes. Surgery can also help improve breathing and speech.
- Dental treatment: This can include orthodontic treatment to correct malocclusion and dental surgery to restore missing teeth or correct abnormally shaped teeth.
- Physical therapy: This therapy may be recommended to help with the development of motor skills and to prevent or correct scoliosis.
- Hearing aids or cochlear implants: Individuals with hearing loss may be fitted with hearing aids or a cochlear implant to improve hearing.
- Speech therapy: This is recommended to help with speech development and to correct a cleft palate.
- Genetic counseling: This can help individuals and families understand the inheritance pattern of BSS and the risks of passing the disorder on to future generations.
Orbital hypertelorism is a condition in which the eyes are positioned farther apart than normal. This occurs because of the increased distance between the orbits, which are the bony cavities in the skull that contain the eyes). The lack of normal movement of the eye muscles causes the eyes to be held in a fixed position. This can give the appearance of wide-set eyes and can be caused by various factors.
Hypertelorism can be caused by either congenital or acquired causes.
- Congenital hypertelorism: This condition is present at birth and can be caused by several genetic disorders, including craniofacial dysostosis, Apert syndrome, and Crouzon syndrome. It can also be caused by chromosomal abnormalities, such as trisomy 9 or trisomy 13.
- Acquired hypertelorism: This condition can occur later in life and can be caused by various factors such as tumors, trauma, or inflammation.
Orbital hypertelorism can cause several issues, including visual disturbances, problems with the symmetry of the face, and breathing and eating difficulties.
What are the symptoms of orbital hypertelorism?
The primary symptoms of orbital hypertelorism are wide-set eyes and visual disturbances, such as double vision or focus issues. However, symptoms can vary depending on the underlying cause and severity of the condition.
Some common symptoms include:
- Asymmetry of the face
- Breathing and eating difficulties as the eyes may be pushed into the nasal cavity
If a tumor causes orbital hypertelorism, the person may experience the following symptoms:
- Changes in vision
- Changes in cognitive function
What are the causes and risk factors for orbital hypertelorism?
Various factors can cause orbital hypertelorism. These can be classified as either congenital or acquired causes.
Various genetic disorders affect the development of the skull and face and cause wide eyes.
Some of the most common congenital causes of hypertelorism include:
- Craniofacial dysostosis: Mutations in various genes can cause craniofacial dysostosis. Hypertelorism is one of its distinguishing features.
- Apert syndrome: Mutation in the FGFR2 gene causes Apert syndrome, which may be presented as hypertelorism.
- Crouzon syndrome: This genetic condition is caused by mutations in the FGFR2 gene. One of the distinguishing features of Crouzon syndrome is hypertelorism.
- Chromosomal abnormalities: Chromosomal abnormalities, such as trisomy 9 or trisomy 13, can cause hypertelorism. Trisomy 9 is a chromosomal disorder caused by an extra copy of chromosome 9, and trisomy 13 is a chromosomal disorder caused by an extra copy of chromosome 13.
- Nager syndrome: It is characterized by malformations of the ears, jaws, and limbs and is caused by a mutation in the SF3B4 gene.
Acquired hypertelorism is a condition that can occur later in life and can be caused by various factors.
Some of the most common acquired causes of hypertelorism include:
- Tumors: Craniopharyngiomas, meningiomas, and pituitary adenomas can cause the eyes to be positioned farther apart as they grow and compress surrounding structures.
- Trauma: Trauma to the face or skull can cause hypertelorism. For example, fractures to the bones of the face or skull can cause the eyes to be positioned farther apart.
- Inflammation: Inflammation in the structures surrounding the eyes, such as the sinuses or orbit, can cause hypertelorism. For example, orbital cellulitis, a severe infection of the eye socket, can cause the eyes to be positioned farther apart.
- Other acquired disorders: Some acquired disorders can cause hypertelorism, such as congenital fibrosis of the extraocular muscles, a disorder that affects the muscles that control eye movement.
- Infections: Some infections such as congenital rubella, toxoplasmosis, and cytomegalovirus, can cause hypertelorism in newborns.
The causes of orbital hypertelorism may not be identified and the condition is considered idiopathic. Additionally, in some cases, multiple factors may be involved in the development of the disorder.
Risk factors for orbital hypertelorism
The risk factors for orbital hypertelorism vary depending on whether the condition is congenital or acquired.
For congenital hypertelorism, the risk factors include:
- Family history of the disorder
- Advanced maternal age
- Certain genetic disorders and chromosomal abnormalities
For acquired hypertelorism, the risk factors include:
- Tumors in the brain or surrounding structures
- Trauma to the face or skull
- Inflammation in the structures surrounding the eyes, such as the sinuses or orbit
Most cases of congenital hypertelorism occur spontaneously and are not inherited. The causes are not well understood and most cases are multifactorial, meaning that a combination of genetic and environmental factors contributes to the development of the disorder.
What are the treatment options for orbital hypertelorism?
Proper treatment can give relief from the condition but some cases of orbital hypertelorism may not be treatable or may require lifelong management.
The treatment options for orbital hypertelorism vary depending on the underlying cause and the severity of the condition.
Some common treatment options include:
- Surgery: This may be an option to correct the position of the eyes, improve the symmetry of the face and alleviate symptoms such as visual disturbances or difficulty breathing or eating.
- The type of surgery will depend on the underlying cause and can include:
- Orbital decompression
- Craniofacial surgery
- Removal of tumors
- The type of surgery will depend on the underlying cause and can include:
- Orthodontic treatment: May be needed to correct jaw misalignment and bite problems caused by orbital hypertelorism.
- Physical therapy: Can help improve muscle strength and range of motion in the face and limbs when necessary.
- Radiation therapy: High-frequency radiation may be used to shrink or eliminate tumors causing hypertelorism.
- Medications: May be used to manage symptoms such as headaches, changes in vision, or cognitive function caused by tumors or other underlying conditions.
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Moebius syndrome is a rare congenital disorder that affects the nerves that control facial muscles, causing facial paralysis and wide eyes. The condition is caused by a congenital absence or underdevelopment of the sixth and seventh cranial nerves, which control the movements of the muscles of the face, eyes, and eyelids.
- When these nerves are affected, the muscles that control the eyes and eyelids do not function properly and lose the ability to move the eyes outwards and give the appearance of a staring or surprised look.
- It also restricts side-to-side movements of the eyes, resulting in a characteristic wide-eyed appearance.
Other symptoms of Moebius syndrome can include a small or missing tongue, a small jaw, and malformed or missing ears.
What are the symptoms of Moebius syndrome?
Moebius syndrome is characterized by wide-set eyes. Additionally, it can cause various other neurological defects ranging from mild to severe.
Some of the most common symptoms include:
- Facial paralysis
- Difficulty smiling
- Difficulty frowning or making other facial expressions
- Difficulty swallowing
- Slurred speech or difficulty making certain sounds
- Muscle spasms
- Small or missing tongue
- Small jaw
- Malformed or missing ears
- Limb malformations
- Missing fingers or toes
- Webbed fingers or toes
- Breathing difficulties
- Developmental delays
What are the causes and risk factors for Moebius syndrome?
The exact cause of Moebius syndrome is not known, but it is believed to be a congenital disorder that occurs during early fetal development.
Several factors have been proposed as possible causes, including:
- Genetic factors: Some researchers suggest that Moebius syndrome may be inherited in an autosomal recessive pattern, which means that the disorder is caused by mutations in two copies of a gene.
- Environmental factors: Some studies report that exposure to certain toxins, such as pesticides or infections during pregnancy, may increase the risk of Moebius syndrome.
- Chromosomal abnormalities: Some cases of Moebius syndrome have been linked to chromosomal abnormalities, such as deletions or translocations of certain genes.
- Teratogens: Exposure to teratogens can cause malformations during fetal development. Teratogens such as alcohol, certain medications, or radiation, can cause Moebius syndrome.
- Idiopathic: In some cases, the cause of Moebius syndrome is unknown (idiopathic), and it is thought to be due to a combination of genetic and environmental factors.
Risk factors for Moebius syndrome
The risk factors for Moebius syndrome are not well understood, but some factors that may increase the risk of the condition include:
- Family history: People with a family history of Moebius syndrome may be at an increased risk of developing the condition.
- Maternal age: There may be an increased risk of Moebius syndrome in babies born to older mothers.
- Exposure to hazards during pregnancy: Exposure to certain toxins, such as pesticides or certain infections during pregnancy, may increase the risk of Moebius syndrome.
- Exposure to teratogens during pregnancy: Exposure to alcohol, certain medications, or radiation during fetal development may increase the risk of Moebius syndrome.
Moebius syndrome can occur spontaneously and is not always inherited. Most cases are multifactorial, meaning that a combination of genetic and environmental factors contributes to the development of the disorder.
What are the treatment options for Moebius syndrome?
The management of Moebius syndrome is multidisciplinary and involves a team of specialists. The treatment options for Moebius syndrome vary depending on the individual case and the specific symptoms present.
Some common treatment options
- Physical therapy: Can help improve muscle strength and range of motion in the face and limbs.
- Occupational therapy: This can help improve their ability to perform daily activities such as eating and dressing.
- Speech therapy: This can help improve speech and communication skills.
- Surgery: This may be an option for some individuals to improve the function of the facial muscles and improve their appearance.
- Orthodontic treatment: May be needed to correct jaw and bite problems caused by Moebius syndrome.
- Assistive devices: Tools such as communication devices and adaptive equipment can be helpful for individuals with Moebius syndrome.
- Medication: Some medications can be used to help manage some Moebius syndrome symptoms, such as drooling and muscle spasms.
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What are the treatment options for wide eyes?
Wide-set eyes, also known as telecanthus, are caused by various genetic conditions. The treatment depends on the severity of the condition, the individual's age, and overall health.
An ophthalmologist specializing in treating eye disorders determines the best treatment plan for each individual. Irrespective of the underlying cause, the treatment for wide eyes is usually similar in most cases, with some additional individual treatments.
Some common treatment options for wide eyes include:
- Surgery: Craniofacial surgery may be used to correct the underlying cause of the wide-set eyes by bringing the inner corners of the eyes closer to each other. This surgery is typically performed by a plastic surgeon or a craniofacial surgeon, and it may involve repositioning the bones around the eyes or the eyelid.
- Eye patching: In some cases, an eye patch may be placed over one eye to encourage the brain to use the other eye more, which can improve the alignment of the eyes over time.
- Eye muscle surgery: May be performed to correct any misalignment of the eye muscles contributing to the wide-set eyes.
- Eyeglasses or contact lenses: May be prescribed to correct any vision problems related to wide-set eyes.
- Orthopedic surgery: May be necessary to correct the underlying problem causing the wide-set eyes.
- Botulinum toxin injection: This toxin can be injected into the eyelid muscles to improve eyelid closure and prevent corneal dryness or ulceration.
- Artificial tears: These drops may be used to lubricate the eyes and prevent dryness.
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Jacobsen Syndrome: https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/jacobsen-syndrome
Noonan Syndrome: https://www.ncbi.nlm.nih.gov/books/NBK1124/
Barber Say Syndrome: https://my.clevelandclinic.org/health/diseases/23270-barber-say-syndrome#:~:text=Barber%20Say%20syndrome%20is%20a,internal%20defects%20or%20intellectual%20disabilities.
Orbital Hypertelorism: https://www.chop.edu/conditions-diseases/orbital-hypertelorism
What is Moebius syndrome? https://moebiussyndrome.org/about-moebius-syndrome/what-is-moebius-syndrome/
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