Protocadherin 19

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Protocadherin 19 is a protein belonging to the protocadherin family, which is part of the large cadherin superfamily of cell-adhesion proteins. The PCDH19 gene encoding the protein is located on the long arm of the X chromosome.

Contents

Clinical significance

Mutations of the PCDH19 gene cause epilepsy-intellectual disability in females. According to a review published in 2021, PCDH19 was one of the six genes most often affected in genetic epilepsies. [1]

History

The PCDH19 gene that encodes the protein was first cloned in 2000 by Nagase et al. [2] In 2008, PCDH19 was identified as the gene responsible for the development of epilepsy-intellectual disability in females, and in the years that have passed since, rare cases were found of males affected by this disease. [3]

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Epilepsy-intellectual disability in females also known as PCDH19 gene-related epilepsy or epileptic encephalopathy, early infantile, 9 (EIEE9), is a rare type of epilepsy that affects predominately females and is characterized by clusters of brief seizures, which start in infancy or early childhood, and is occasionally accompanied by varying degrees of cognitive impairment. The striking pattern of onset seizures at a young age, genetic testing and laboratory results, potential developmental delays or developmental regression and associated disorders, eases diagnosis.

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References

  1. Dell'Isola GB, Vinti V, Fattorusso A, Tascini G, Mencaroni E, Di Cara G, Striano P, Verrotti A (2021). "The Broad Clinical Spectrum of Epilepsies Associated With Protocadherin 19 Gene Mutation". Frontiers in Neurology. 12: 780053. doi: 10.3389/fneur.2021.780053 . PMC   8801579 . PMID   35111125.
  2. Nagase T, Kikuno R, Ishikawa KI, Hirosawa M, Ohara O (February 2000). "Prediction of the coding sequences of unidentified human genes. XVI. The complete sequences of 150 new cDNA clones from brain which code for large proteins in vitro". DNA Research. 7 (1): 65–73. doi: 10.1093/dnares/7.1.65 . PMID   10718198.
  3. Kolc KL, Sadleir LG, Scheffer IE, Ivancevic A, Roberts R, Pham DH, Gecz J (February 2019). "A systematic review and meta-analysis of 271 PCDH19-variant individuals identifies psychiatric comorbidities, and association of seizure onset and disease severity". Molecular Psychiatry. 24 (2): 241–251. doi:10.1038/s41380-018-0066-9. PMC   6344372 . PMID   29892053.