TRIPLE X SYNDROME (TRISOMY X)

Medicover Genetics Editorial Team |
February 17, 2025

Scientifically reviewed | Last updated
For more information see our editorial policy

XXX

Category: Tag:

Triple X syndrome is characterized by a trisomy of the X chromosome. Apart from an above-average height, patients may not show any significant physical symptoms.

 

Also called

Triple X syndrome is also known as:

 

  • 47,XXX syndrome
  • Triplo X syndrome
  • Trisomy X
  • XXX syndrome

 

Symptoms

The main symptom is above-average height.

 

Approximately 70% of women are fertile, but some have menstrual irregularities and premature menopause. Intelligence may be 10–15 points below the family average. There may be a delay in speech development. No increased risk of gonosomal aneuploidies has been described for offspring of triple X women.

 

 

Frequency

The prevalence of triple X syndrome is reported to be approximately 1:1,000 in female newborns.

 

Cause

Triple X syndrome is caused by an extra X chromosome. In 98% of patients, trisomy X is found in all cells, while 2% show mosaicism (extra X chromosome is only in some cells).

 

Inheritance

Triple X syndrome is usually not inherited.

 

Diagnosis

The clinical effects are highly variable, and any women with triple X are never diagnosed. Diagnosis is confirmed by karyotype or chromosomal microarray.

 

References

Ogata et al. 2001, J Med Genet 38:1 / Müller-Henbach et al. 1977, Am J Obstet Gynecol 127:211

GENES
XXX
HOW CAN YOU GET TESTED?
Step 1: Visit healthcare professional
Step 2: Sample collection (blood or buccal swab)
Step 3: Sequencing performed at our accredited laboratory
Step 4: Medical report
Step 5: Genetic counselling
FAQ

Can people with triple X syndrome have children? 

How common is triple X syndrome? 

What are the symptoms of triple X syndrome? 

CONTACT US

Please get in touch with us for any questions, inquiries, feedback or with any comments you might have.

LATEST ARTICLES

The Human Genome Project, created to determine the sequence of the human genome, was one of the most important biomedical research projects of the 20...

Read more

The endometrial microbiome is increasingly recognized as a factor in reproductive health, and imbalances in microbial composition have been linked to...

Read more

Spinal muscular atrophy is a rare genetic condition that weakens muscles by affecting the motor nerve cells in the spinal cord. It is a leading genet...

Read more

Summer encourages people to spend more time outdoors, soaking in the sun and enjoying the season’s warm weather. While sunlight can have beneficial...

Read more

We're thrilled to share the results of Medicover Genetics essay competition for high school students as well as the two winning essays. This competit...

Read more

Cystic fibrosis (CF) is a life-threatening, progressive, inherited condition that causes severe damage to the body, primarily affecting the organs of...

Read more

Down syndrome is a genetic condition caused by the presence of an extra copy of chromosome 21. It affects physical growth, facial features, and cogni...

Read more

Every year on April 25th, DNA Day celebrates the discovery of DNA’s double helix and the advances we’ve made in understanding genetics. D...

Read more

Neurodevelopmental disorders (NDDs) have diverse genetic origins, making diagnosis challenging. A new study analyzing over 1,100 pediatric patients f...

Read more

Colorectal cancer (CRC) remains one of the most prevalent and deadly cancers worldwide, with a significant number of cases presenting at an advanced ...

Read more