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Mutation of a type II keratin gene (K6a) in pachyonychia congenita

Bowden, Paul Edward, Haley, Joanne L., Kansky, Aleksej, Rothnagel, Joseph A., Jones, David O. and Turner, Richard J. 1995. Mutation of a type II keratin gene (K6a) in pachyonychia congenita. Nature Genetics 10 (3) , pp. 363-365. 10.1038/ng0795-363

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Pachyonychia congenita (PC) is a rare autosomal dominant condition characterized by multiple ectodermal abnormalities1−3. Patients with Jadassohn-Lewandowsky Syndrome (MIM sharp167200; PC-1) have nail defects (onchyogryposis), palmoplantar hyperkeratosis, follicular hyperkeratosis and oral leukokeratosis4. Those with the rarer Jackson-Lawler Syndrome (MIM sharp167210; PC-2) lack oral involvement but have natal teeth and cutaneous cysts5. Ultra-structural studies have identified abnormal keratin tonofilaments6 and linkage to the keratin gene cluster on chromosome 17 has been found in PC families7. Keratins are the major structural proteins of the epidermis and associated appendages and the nail, hair follicle, palm, sole and tongue are the main sites of constitutive K6, K16 and K17 expression8−10. Furthermore, mutations in K16 and K17 have recently been identified in some PC patients11. Although we did not detect K16 or K17 mutations in PC families from Slovenia, we have found a heterozygous deletion in a K6 isoform (K6a) in the affected members of one family. This 3 bp deletion (AAC) in exon 1 of K6a removes a highly conserved asparagine residue (DeltaN170) from position 8 of the 1A helical domain (DeltaN8). This is the first K6a mutation to be described and this heterozygous K6a deletion is sufficient to explain the pathology observed in this PC-1 family.

Item Type: Article
Status: Published
Schools: Medicine
Subjects: R Medicine > R Medicine (General)
ISSN: 1061-4036
Last Modified: 12 Jun 2019 02:22

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