Skip to main content

Posts

Adenosine deaminase (ADA)

 Adenosine deaminase (ADA) Overview Adenosine deaminase (ADA) deficiency is a rare, autosomal recessive metabolic disorder that impairs lymphocyte development and causes severe combined immunodeficiency (SCID). Without the ADA enzyme, toxic metabolites (such as dATP) accumulate, destroying T, B, and NK cells. Untreated ADA-SCID is typically fatal in infancy. Symptoms The signs and symptoms of ADA deficiency generally fall into three categories :1. Severe Immune Deficiency (ADA-SCID)Around 80% of cases are severe and appear within the first 6 months of life. Without treatment, these are usually fatal within the first or second year. Recurrent Infections: Frequent, persistent, or unusual cases of pneumonia, chronic diarrhea, thrush (oral yeast), and skin rashes. Failure to Thrive: Severely slow growth in height and weight, often resulting in developmental delays. No Functional Immunity : A near-complete lack of T-cells, B-cells, and natural killer (NK) cells. 2. Skeletal & Non-...
Recent posts

Autosomal Dominant Hyper IgE Syndrome

Autosomal Dominant Hyper IgE Syndrome Overview Autosomal dominant hyper IgE syndrome (AD-HIES) is a rare multisystem primary immunodeficiency disorder. Symptoms often become apparent early during infancy or childhood. The disorder is characterized by repeated bacterial infections of the skin and lungs (pneumonia), skeletal abnormalities, and characteristic facial features. The first symptom is often the development of a dry, red flaky skin rash (eczema) at birth or early during infancy. Researchers have discovered that mutations in the STAT3 gene cause AD-HIES in over 60% of the patients. Most cases of AD-HIES occur as the result of a new mutation in this gene. There are two main forms of hyper IgE syndrome – one inherited in an autosomal dominant pattern and one in an autosomal recessive pattern. Both involve defects of the immune system and elevated levels of immunoglobulin E (hyper IgE) in the blood. For years, researchers considered them different expressions of the same disorder, ...

Anauxetic dysplasia

Anauxetic dysplasia Overview Anauxetic dysplasia is an extremely rare, severe form of skeletal dysplasia. Meaning "not growing" in Greek, it is characterized by profound prenatal-onset dwarfism (resulting in an adult height of less than 85 cm), joint hypermobility, distinctive facial features, and mild intellectual disability. Symptoms Anauxetic dysplasia is an extremely rare, genetic form of dwarfism. The condition is primarily characterized by severe prenatal-onset short stature, disproportionately short limbs, joint hypermobility, distinct facial features, and mild intellectual disability. The key symptoms and physical characteristics associated with the condition include: Extreme short stature: Affected individuals typically have an adult height of less than one meter. Disproportionate limbs: Arms and legs are unusually short relative to the torso, present even before birth. Spinal issues: Abnormal curvature of the upper and lower spine (kyphoscoliosis and hyperlordosis...

Peroxisomal acyl-CoA oxidase deficiency

Peroxisomal acyl-CoA oxidase deficiency Overview Peroxisomal acyl-CoA oxidase deficiency is a rare inherited disorder that causes severe neurodegeneration, weak muscle tone, and seizures starting in infancy. Caused by mutations in the \(ACOX1\) gene, it leads to a toxic accumulation of very long-chain fatty acids and is typically fatal in early childhood. Symptoms Peroxisomal acyl-CoA oxidase deficiency is a rare, inherited neurodegenerative disorder. It primarily presents in infancy with weak muscle tone (hypotonia), recurrent seizures, and distinctive facial features (such as widely spaced eyes and a low nasal bridge). While some developmental milestones are initially achieved, a devastating loss of skills typically follows. A structured breakdown of the symptoms includes: Early / Neonatal Symptoms (From Birth) Neurological: Severe neonatal hypotonia (weak muscle tone) and neonatal seizures. Facial Dysmorphism: Distinct features like a depressed/low nasal bridge, widely spaced eyes ...

Bilateral canal atresia

Bilateral canal atresia Overview Bilateral canal atresia (aural atresia) is the congenital absence or underdevelopment of the external ear canals in both ears. It is frequently associated with microtia and causes bilateral conductive hearing loss. Immediate aural rehabilitation is critical to ensure normal speech, language, and cognitive development Symptoms  Hearing Loss: Bilateral moderate-to-severe conductive hearing loss prevents adequate sound from naturally reaching the brain. Without early intervention, it can lead to speech and language delay's. Microtia : The outer ear (pinna) is typically underdeveloped. It may be completely absent or appear small and peanut-shaped. Associated Craniofacial Anomalies : Atresia can occur as part of a genetic syndrome (e.g., Treacher Collins or Crouzon syndrome), which may involve jaw or facial nerve abnormalities'. Drainage and Infections: If the canal is partially narrowed (stenosis) rather than completely closed, it can trap debris ...

Acute necrotizing encephalopathy type 1

Acute necrotizing encephalopathy type 1 Overview Acute necrotizing encephalopathy type 1 (ANE1) is a rare, severe brain disease usually triggered by viral infections like the flu or SARS-CoV-2. Characterized by a rapid onset of seizures and coma, it is driven by an extreme immune response ("cytokine storm") that causes symmetrical lesions and tissue damage in the brain. Symptoms 1. Prodromal (Viral) Phase Before the brain is affected, the patient generally shows typical symptoms of a viral infection for a few days: Fever  Cough  Nasal congestion Vomiting  Diarrhea 2. Acute Encephalopathy (Neurological) Phase Shortly after the viral symptoms, the condition rapidly affects the brain and central nervous system. Key signs include: Rapidly altered consciousness (ranging from confusion and lethargy to a coma) Seizures Ataxia (difficulty coordinating movements) Abnormal muscle tone (dystonia or rigidity) Hallucinations 3. Systemic and Associated Symptoms ANE1 can affect the rest...

Cytogenetically normal acute myeloid leukemia (CN-AML)

Cytogenetically normal acute myeloid leukemia (CN-AML) Overview Cytogenetically normal acute myeloid leukemia (CN-AML) is a common subtype of AML where bone marrow cells show normal chromosomes under a microscope, despite the presence of leukemia. Because standard chromosomal tests appear normal, diagnosis relies heavily on molecular genetic testing to identify specific gene mutations that guide treatment and prognosis. Symptoms Cytogenetically normal acute myeloid leukemia (CN-AML) symptoms result from a rapid overproduction of abnormal, immature white blood cells in the bone marrow, which crowds out healthy blood cells. The most common indicators are fatigue, increased susceptibility to infections, easy bruising or bleeding, fever, and unexplained weight loss. Because healthy blood cell production is disrupted, the signs and symptoms of CN-AML manifest in three main categories: 1. Low Red Blood Cells (Anemia)Extreme tiredness and weakness Pale skin and lips Shortness of breath, even ...