Author/Editor		Bowden, PE; Haley, JL; Kansky, A; Rothnagel, JA; Jones, DO; Turner, RJ
Title		Mutation of a type II keratin gene (K6a) in pachyonychia congenita
Type		članek
Source		Nat Genet
Vol. and No.		Letnik 10, št. 3
Publication year		1995
Volume		str. 363-5
Language		eng
Abstract		Pachyonychia congenita (PC) is a rare autosomal dominant condition characterized by multiple ectodermal abnormalities. Patients with Jadassohn-Lewandowsky Syndrome (MIM :167200; PC-1) have nail defects (onchyogryposis), palmoplantar hyperkeratosis, follicular hyperkeratosis and oral leukokeratosis. Those with the rarer Jackson-Lawler Syndrome (MIM :167210; PC-2) lack oral involvement but have natal teeth and cutaneous cysts. Ultra-structural studies have identified abnormal keratin tonofilaments and linkage to the keratin gene cluster on chromosome 17 has been found in PC families. 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 expression. Furthermore, mutations in K16 and K17 have recently been identified in some PC patients. 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 (delta N170) from position 8 of the 1A helical domain (delta N8). 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.
Descriptors		KERATIN KERATODERMA, PALMOPLANTAR SEQUENCE DELETION AMINO ACID SEQUENCE BASE SEQUENCE DNA GENES, DOMINANT HETEROZYGOTE KERATODERMA, PALMOPLANTAR LEUKOPLAKIA MOLECULAR SEQUENCE DATA NAILS, MALFORMED PEDIGREE SYNDROME