Down Syndrome Overview

Down syndrome is a genetic disorder caused by the presence of an extra copy of chromosome 21. Distinctive physical features, developmental delays, and intellectual disabilities characterize it.

Individuals with Down syndrome may also have various health issues, such as

Heart defects,
Gastrointestinal problems,
Vision or hearing impairments.

While there is no cure for Down syndrome, early intervention, therapies, and support services can help individuals with the condition lead fulfilling lives and reach their full potential.

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Types of Down syndrome

There are three types

Trisomy 21
Translocation Down syndrome
Mosaic Down syndrome

Down Syndrome Symptoms

Distinctive facial features, such as
- Small head
- Flattened face
- Short neck
- Protruding tongue
- Palpebral fissures - Upward slanting eye lids
Congenital heart defects
- Atrioventricular septal defect (AVSD)
- Ventricular septal defect (VSD)
- Secundum atrial defect
- Tetralogy of Fallot
- Isolated PDA
Gastrointestinal (GI) abnormalities
- Hirschsprung disease
- Intestinal obstruction
- Duodenal atresia
- Imperforate anus
- Gastroesophageal reflux (GERD)
Hematological disorders
- Transient abnormal myelopoiesis (TAM) or transient leukaemia
- Neutrophilia
- Thrombocytopenia
- polycythemia

Neurologic Disorders
- Intellectual disability
- Less concentration
- Seizures
- Myoclonic seizures
- Lennox-Gastaut syndrome
- Dementia
Endocrinological Disorders
- Thyroid gland dysfunction
- Hypothyroidism
- Hyperthyroidism (rare)
- Delayed puberty
- Primary hypogonadism (in girls)
- Cryptorchidism, micropenis, ambiguous genitalia, small testes, low sperm count and less pubic hair. (in boys)
Musculoskeletal Disorders
- Hypotonia (decreased muscle tone)
- Decreased bone mass leads to an increased risk of fractures.
- Vitamin D deficiency
- Growth retardation
- Short height
- Broad, short hands
- Short fingers and small hands and feet
Refractive Errors and Visual Abnormalities
Otorhinolaryngological ( ENT) Disorders

What Causes Down Syndrome?

A child gets genetic material from its parents in the form of 46 chromosomes, mostly 23 from the father and 23 from the mother. Often, in Down syndrome, a baby inherits an extra chromosome 21, resulting in a total of 47 chromosomes instead of 46. In a few cases, the extra chromosome 21 gets attached to another chromosome.

This additional genetic material causes distinctive physical features and developmental disabilities in Down syndrome individuals. The characteristics are the same if the extra chromosome is by itself or attached to another one. Any one of the below-given genetic variations can have Down syndrome.

Trisomy 21
Mosaic Down syndrome
Translocation Down syndrome

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Risk Factors of Down Syndrome

Advancing maternal age: Women above 35 years of age possess a higher risk of giving birth to a child with Down syndrome.
Being a carrier of the Down syndrome genetic translocation: Both father and mother can pass on the genetic translocation for Down syndrome to their kids.
Having a first child with Down syndrome: Parents who already have one child with it and parents who have translocation Down syndrome themselves have a higher chance of having another child with the same condition.

Diagnosis of Down Syndrome

Pregnant women of all ages should undergo screening tests and diagnostic tests to diagnose Down syndrome

Screening tests: These tests can indicate the possibility that a mother is carrying a child with Down syndrome. The screening tests can't accurately show whether the baby has Down syndrome.
Screening tests during pregnancy: Screening tests are used to identify the risk of carrying a Down syndrome baby. These tests can help to make decisions about other, more specific diagnostic tests.
Screening tests include :
- Nuchal translucency testing
- The triple screen or quadruple screen (multiple marker test)
- Integrated screen
- An ultrasound
- Cell-free fetal DNA analysis
Diagnostic tests include :
- Chorionic villus sampling (CVS)
- Amniocentesis
- Percutaneous umbilical blood sampling (PUBS) or cordocentesis

Down Syndrome Treatment

Down syndrome cannot be cured but can be managed with a multidimensional approach.
Newborns suspected of Down syndrome should undergo karyotyping for diagnosis confirmation.
Genetic testing and counseling for both parents are recommended.
Early therapies focus on improving motor, speech, coordination, and educational skills.
Proper treatment and support enable individuals with Down syndrome to lead happy and productive lives.

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Frequently Asked Questions

1. What is life expectancy for Down Syndrome?

The life expectancy for individuals with Down syndrome has increased significantly in recent years and now averages around 60 years, with many living into their 60s and beyond, thanks to advances in medical care and support services.

2. What are people with Down syndrome like?

People with Down syndrome have unique abilities, personalities, and interests, just like anyone else. They may have intellectual disabilities, but they also have strengths and talents, and they can lead fulfilling lives with appropriate support and opportunities.

3. Is Down syndrome curable?

Down syndrome is a genetic condition caused by the presence of an extra chromosome 21 and currently has no cure. However, medical advancements and early interventions can help manage associated health issues and support individuals in reaching their full potential.

4. What medical conditions are common in Down syndrome?

Individuals with Down syndrome may be at higher risk for certain medical conditions, including congenital heart defects, hearing and vision problems, thyroid disorders, and gastrointestinal issues. Regular medical screenings and interventions can help manage these conditions effectively.

5. What causes down syndrome?

Down syndrome is caused by the presence of an extra copy of chromosome 21, typically occurring randomly during cell division. This extra genetic material leads to the physical and developmental characteristics associated with the condition.

6. What is the best treatment for Down syndrome?

Treatment for Down syndrome focuses on managing symptoms and supporting development. Early intervention therapies, educational programs, and medical care tailored to individual needs are key in down syndrome treatment.

7. What are the three types of Down syndrome?

The three types of Down syndrome are Trisomy 21 (the most common), Translocation Down syndrome, and Mosaic Down syndrome. Each type results from a different genetic variation causing types of down syndrome.

8. What are 4 physical symptoms of Down syndrome?

Common physical symptoms of Down syndrome include low muscle tone (hypotonia), upward slanting eyes, a single crease across the palm (simian crease), and a smaller-than-average head size. These are physical symptoms of down syndrome.