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What is the prevalence of Allan-Herndon-Dudley Syndrome?

How many people does Allan-Herndon-Dudley Syndrome affect? Does it have the same prevalence in men and women? And in the different countries?

Prevalence of Allan-Herndon-Dudley Syndrome

Allan-Herndon-Dudley Syndrome is a rare genetic disorder that primarily affects males. It is caused by mutations in the SLC16A2 gene, which is responsible for transporting thyroid hormones into cells. The prevalence of this syndrome is extremely low, estimated to be less than 1 in 100,000 individuals worldwide. Due to its rarity, it is considered an orphan disease. Symptoms include intellectual disability, muscle weakness, and impaired speech. Early diagnosis and management are crucial for individuals with Allan-Herndon-Dudley Syndrome to optimize their quality of life.



Allan-Herndon-Dudley Syndrome (AHDS) is an extremely rare genetic disorder that primarily affects males. It is caused by mutations in the SLC16A2 gene, which is responsible for producing a protein called monocarboxylate transporter 8 (MCT8). This protein plays a crucial role in transporting thyroid hormones into cells throughout the body.


The prevalence of AHDS is difficult to determine due to its rarity and the lack of comprehensive data. However, it is estimated to affect approximately 1 in 40,000 to 60,000 individuals worldwide. The syndrome is more commonly observed in certain populations, such as those with a high degree of consanguinity.


Individuals with AHDS typically experience severe intellectual disability, delayed development, muscle weakness, and abnormal muscle tone. They may also exhibit neurological symptoms such as poor coordination, spasticity, and impaired speech. The severity of symptoms can vary, with some individuals being more severely affected than others.


Given the rarity of AHDS, it is crucial to raise awareness about the syndrome among healthcare professionals and the general public. Early diagnosis and appropriate management can help improve the quality of life for individuals living with AHDS and their families.


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