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Hereditary Diseases: Causes, Symptoms & Treatment

Hereditary diseases are genetically caused conditions that arise from changes in a person's DNA and can be passed from parents to their children.

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Things worth knowing about "Hereditary diseases"

Hereditary diseases are genetically caused conditions that arise from changes in a person's DNA and can be passed from parents to their children.

What are Hereditary Diseases?

Hereditary diseases (also called genetic disorders or inherited diseases) are conditions caused by changes in a person's genetic material – the DNA. These changes can be passed from one or both parents to their children, or they may occur spontaneously during cell division. Hereditary diseases can affect virtually any organ or bodily function and vary widely in severity.

Causes

Hereditary diseases are caused by genetic changes known as mutations. These can occur in several ways:

Monogenic disorders: A single change in one specific gene causes the disease (e.g., cystic fibrosis, phenylketonuria).
Chromosomal disorders: The number or structure of chromosomes is altered (e.g., Trisomy 21, also known as Down syndrome).
Polygenic and multifactorial disorders: Multiple genes combined with environmental factors play a role (e.g., certain forms of diabetes or heart disease).
Mitochondrial disorders: Changes in the DNA of the mitochondria, which are inherited exclusively through the mother.

Inheritance Patterns

Hereditary diseases follow different inheritance patterns that determine how likely it is for offspring to be affected:

Autosomal dominant: A mutation in one copy of a gene is sufficient to cause the disease (e.g., Huntington's disease).
Autosomal recessive: Both parents must pass on the altered gene for the child to be affected (e.g., cystic fibrosis, sickle cell anaemia).
X-linked: The mutated gene is located on the X chromosome. Males are more commonly affected as they carry only one X chromosome (e.g., haemophilia, Duchenne muscular dystrophy).

Symptoms

The symptoms of hereditary diseases vary greatly depending on the specific condition. They may include:

Physical malformations or developmental disorders
Intellectual disabilities or learning difficulties
Metabolic disorders (e.g., absent or reduced enzyme activity)
Muscle weakness or limited mobility
Diseases of the heart, lungs, kidneys, or other organs
Frequent infections due to a weakened immune system

Some hereditary diseases are evident at birth, while others may not become apparent until childhood, adulthood, or even later in life.

Diagnosis

Hereditary diseases are diagnosed using a variety of methods:

Genetic testing: Analysis of DNA for known mutations using a blood or saliva sample.
Chromosomal analysis (karyotyping): Examination of the number and structure of chromosomes under a microscope.
Prenatal diagnostics: Tests during pregnancy such as amniocentesis or chorionic villus sampling to detect genetic changes in the unborn child.
Newborn screening: A routine blood test performed a few days after birth to detect certain metabolic disorders early.
Family history: A detailed record of diseases within the family to identify hereditary risk factors.

Treatment

A complete cure is currently not possible for most hereditary diseases, as the genetic change is present in every cell of the body. Treatment therefore aims primarily at relieving symptoms and improving quality of life:

Drug therapy: Replacement of missing substances (e.g., enzyme replacement therapy) or management of symptoms.
Dietary therapy: Especially important in metabolic diseases such as phenylketonuria, where a special diet is essential.
Physiotherapy and rehabilitation: Support for motor impairments and physical limitations.
Gene therapy: A relatively new and promising field of research that attempts to repair or replace defective genes directly.
Stem cell transplantation: For certain immune system or blood disorders, a stem cell transplant may be beneficial.
Psychosocial support: Counselling and guidance for those affected and their families.

Genetic Counselling

People with a hereditary disease in the family or with an increased genetic risk can seek genetic counselling. Specialist geneticists explain inheritance risks, possible tests, and available options. This counselling is particularly recommended before a planned pregnancy.

References

World Health Organization (WHO) – Genomics and Health: Human Genomics in Global Health. Available at: https://www.who.int/genomics/en/
Strachan T, Read A – Human Molecular Genetics, 4th edition, Garland Science, 2011.
National Institutes of Health (NIH) – National Human Genome Research Institute: Genetic Disorders. Available at: https://www.genome.gov/For-Patients-and-Families/Genetic-Disorders

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