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Rare genetic diseases: invisible challenges for medicine and the family
What are rare genetic diseases?
Rare (orphan) genetic diseases are diseases that occur in less than 1 in 2,000 people. Most of them have hereditary character and manifest themselves from childhood, although some may remain unnoticed until adulthood.
Despite the low prevalence of each individual pathology, the total number of patients with rare diseases in the world is millions. In more than 80% such cases, the cause is genetic mutations.
How do these diseases occur?
Genetic changes can be:
inherited from parents — when both carry the mutant gene (for example, in autosomal recessive inheritance)
de novo mutations — that arise spontaneously in the embryo
as a result of chromosomal rearrangements or point mutations
Even a single mutation can alter protein synthesis, leading to dysfunction of cells, tissues, and entire systems.
Examples of rare genetic diseases
| Disease name | Main manifestations |
|---|---|
| Cystic fibrosis | Respiratory problems, frequent infections, digestive problems |
| Rett syndrome | Loss of language and motor skills in girls after 6 months of age |
| Phenylketonuria | Amino acid metabolism disorders, mental retardation without treatment |
| Duchenne muscular dystrophy | Progressive muscle weakness in boys |
| Gaucher disease | Enlarged liver and spleen, bone disorders |
| Prader-Willi syndrome | Excessive appetite, developmental delay, decreased muscle tone |
How to detect a rare disease?
Diagnosis is usually complex and takes months or even years. The main stages are:
clinical suspicion based on symptoms, family history, physical examination
molecular genetic tests (sequencing, gene panels, exome or whole genome sequencing)
biochemical markers — in cases of metabolic disorders
neonatal screening — allows you to detect some conditions even in the maternity hospital
Why is early diagnosis critical?
Prevents irreversible complication
Gives the opportunity start treatment or supportive therapy
Allows genetic counseling for the family
Gives time for adaptation and psychological support
Modern treatment: what is real?
Treatment depends on the specific pathology. In some cases, the following is used:
Replacement therapy (e.g. enzymes for mucopolysaccharidosis)
Dietary therapy (for phenylketonuria)
Gene therapy and RNA drugs — for a number of orphan diseases (e.g. Zolgensma for SMA)
Physical and rehabilitation assistance — to maintain quality of life
Symptomatic treatment — reduction of pain, cramps, breathing problems
How do patients live?
Patients with rare genetic diseases often need:
constant medical support
multidisciplinary approach (neurologist, geneticist, pediatrician, psychologist, speech therapist)
social and educational support
An important role is played by patient organizations, which help families find resources, information, specialized centers, and communication.
Can I warn you?
Yes. Genetic counseling and prenatal diagnosis allow:
assess the risks for future children
to perform screening when planning pregnancy
determine the carrier status of certain pathologies in a couple
