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First female with Allan-Herndon-Dudley syndrome and partial deletion of X-inactivation center


Allan-Herndon-Dudley is an X-linked recessive syndrome caused by pathogenic variants in the SLC16A2 gene. Clinical manifestations are a consequence of impaired thyroid metabolism and aberrant transport of thyroid hormones to the brain. Carrier females are generally asymptomatic and may show subtle symptoms of the disease. We describe a female with a complete Allan-Herndon-Dudley phenotype, carrying a de novo 543-kb deletion of the X chromosome. The deletion encompasses exon 1 of the SLC16A2 gene and JPX and FTX genes; it is known that the latter two genes participate in the X-inactivation process upregulating XIST gene expression. Subsequent studies in the patient demonstrated the preferential expression of the X chromosome with the JPX and FTX deletion.

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Correspondence to Juan F. Quesada-Espinosa or Lucía Garzón-Lorenzo.

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Quesada-Espinosa, J.F., Garzón-Lorenzo, L., Lezana-Rosales, J.M. et al. First female with Allan-Herndon-Dudley syndrome and partial deletion of X-inactivation center. Neurogenetics 22, 343–346 (2021).

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  • Allan-Herndon-Dudley syndrome
  • SLC16A2
  • X chromosome inactivation
  • JPX
  • FTX