Xia Gibbs Syndrome - Causes, Diagnosis, and Treatment

Introduction:

XGS (Xia Gibbs syndrome) is a genetic disorder that rarely occurs due to a heterozygous mutation of the gene AHDC1. This gene helps encode the transcription factor that helps bind the DNA. It is characterized by the impairment of sensory and motor senses, developmental abnormalities of the brain, issues in feeding and sleep, delayed development, and short stature. It was discovered by Xia less than a decade ago, and hence, sufficient data is not available.

What Is Xia Gibbs Syndrome?

It is a disorder involving the neurological system that is characterized by decreased muscle tone, disability of intellectual property, and delay in development. Children with a diagnosis of this condition reach their milestones very late. Speaking the first word, which is a milestone in the life of every child, is achieved a year or two later, and sometimes the child can never learn to talk. Walking or crawling can also be delayed. The growth of an individual is impaired, and most of them appear shorter. Along with this, unusual facial features are also exhibited.

What Are the Causes of Xia Gibbs Syndrome?

Mutations in the AHDC1 gene lead to Xia-Gibbs syndrome. The basic gene involved in making a protein that binds to the DNA and controls other gene activities. Variations usually produce short proteins, and the effects of such changes are unclear. Shorter proteins can be broken down or can alter their function. Impairment of normal brain development can be seen, which leads to speech problems, intellectual disabilities, and other abnormal functions.

What Is the Frequency of Occurrence of Xia Gibbs Syndrome?

It is a rare disease whose prevalence is unknown. Most of the cases go underdiagnosed because the underlying cause determination for intellectual disability has never undergone genetic testing.

What Are the Clinical Features of Xia Gibbs Syndrome?

Behavioral Abnormalities:

1. Seizures (uncontrolled sudden electrical changes in the brain leading to rapid movements).

2. Autistic features (autism is a developmental disorder caused by genetic conditions).

3. Aggression.

4. Self-injurious behavior.

Brain Abnormalities

1. Corpus callosum dysgenesis or hypoplasia (birth defect of the brain).

2. Cystic lesions( a fluid-filled sac in the brain).

Movement Disorders

1. Tremors.

2. Ataxia ( disorders that affect balance, coordination, and speech).

3. Bradykinesia(decrease in the speed of movements).

4. Brachycephaly (short head).

5. Craniosynostosis(joining of bones in the skull at an early age in an infant).\

Other Symptoms

1. Unilateral scoliosis (curvature of the spinal cord in a lateral position).
2. Unilateral ptosis (upper eyelid drooping).
3. Deviated features including deviated nasal septum.
4. Slanting palpebral fissures.
5. Horizontal eyebrows.
6. Dysplastic dentition (lack of production of dentine in the teeth)
7. Micrognathia (small jaws).

In adults, the following are the clinical features of the syndrome.

• Most of the genetic disorders appear in young age and early childhood and only a few of them tend to appear in the third decade of life. Significant disturbance in balance and coordination exhibited by patients suffering from ataxia and frequent falls was seen to occur.
• Disruption of sleep was highly occurring along with rare findings of sleep apnea.

What Is the Diagnosis of Xia Gibbs Syndrome?

• The presence of particular features of a syndrome can help in establishing a proper diagnosis in the case of Down syndrome. On the other hand, rare syndromes with limited clinical findings pose difficulties in diagnosis.

• Any disorders related to genetic abnormalities can be detected by using gene testing. Genetic tests for confirmation of the diseases cannot be feasible due to high expenditure. The condition is either underdiagnosed or undiagnosed, which alters the understanding of the final condition of the syndrome.

• Lack of considering the symptoms at an early stage leads to a decrease in the probability of achieving maximum success in the treatment.

What Are the Management Steps for Xia Gibbs Syndrome?

• Physiotherapy can be the primary intervention that helps in achieving development and milestones along with neuronic development and sensory integration. Certain equipment, like a Swiss ball, was used to achieve milestones in kids. Extension of the trunk was practiced on the Swiss ball.

• Appropriate placement of the physician's hand was used as trunk stabilizing pressure input orthosis to help the child practice positions from supine to sit, sit to stand, and half kneel to stand.

What Is the Role of Growth Hormone Therapy?

Defects in the stature of an individual can be corrected by correcting the levels of growth hormone. Growth hormone therapy was used prior to genetic testing. Results were seen spreading a positive light in increasing the growth velocity of nearly 10 centimeters per year. No significant side effects were reported. The consistency in the effect of the treatment was also a major concern.

What Is the Role of Physiotherapeutic Intervention?

• Physiotherapy plays a crucial role in the treatment of delays in motor responses due to various causes. Regular physiotherapy sessions based on sensory integration principles along with neurodevelopment in treatment lead to major benefits and greater results in the treatment. In the case of a 2-year-old boy who was unable to sit when treated with physiotherapy could not only sit or stand but could do both without support at 3 years of age.

• Proprioception is given through weight-bearing exercises, joint compressions, and wheelbarrows.

• Deviations in the spine, known as scoliosis, were treated with rib cage mobilization and supportive hanging.

Conclusion:

Genetic variations and the characteristic appearance of the syndrome are then correlated to provide an unclear picture. It is still being investigated as a rare disease. Very limited information is available on the management of patients suffering from the syndrome. Although all physiotherapy and harmful replacement therapy are beneficial in individual cases, effective management for standardized rehabilitation with the help of a multidisciplinary team has yet to be documented. Genetic tests have to be performed to gain a proper diagnosis, and proper planning of the treatment can be done.