AQP5 MUTATION AS A CAUSE OF PALMOPLANTAR KERATODERMA IN A RUSSIAN FAMILY
https://doi.org/10.25557/2073-7998.2018.07.46-51
Abstract
Hereditary palmoplantar keratoderma (PPK) is characterized by hyperkeratosis of the skin of palms and soles. PPK type Bothnia was described as having a high prevalence in the 2 northernmost provinces of Sweden, situated to the west and the northwest of the Gulf of Bothnia. In Swedish families with dominant PPK researchers established that the phenotype had been linked to the most frequent locus 12q13, but no mutations were found in KRT1. Various missense AQP5-mutations were found in all cases. A three-generation family of Chinese Han ethnicity with AQP5-PPK was described later. In a five-generations Russian PPK family the cause of the disease was searched using the linkage analysis, Senger sequencing, MPS (IlluminaTruSeq® ExomeKit). We found a linkage to locus 12q13. The maximum Lod score of 3.69 was observed on D12S368 (52 631 kb). The area was limited within D12S1661 (48 607kb): Lod - 2.61 = 0 and D12S1586 (54 146 kb): Lod - 3.66 = 0. However, no mutation in KRT1 and over KRT’s genes of this region was revealed. We performed an exome analysis in one of the patients and identified three heterozygous variants in the target region. Two variants in CELA1 and OR8S1 genes did not segregate with the disease in the family and only one AQP5 c.369C>G(p.Asn123Lys) substitution could be a root of the PPC in this family (Lod max — 3.71 = 0.00). We confirmed that the cause of PPK could be mutations in the water-channel aquaporin-5 gene. Our findings have shown that AQP5-PPK can be found in different ethnic groups, not only in Bothnia region.
About the Authors
O. A. ShchaginaRussian Federation
V. P. Fedotov
Russian Federation
Voronezh.
T. V. Fedotova
Russian Federation
Voronezh.
A. V. Polyakov
Russian Federation
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Review
For citations:
Shchagina O.A., Fedotov V.P., Fedotova T.V., Polyakov A.V. AQP5 MUTATION AS A CAUSE OF PALMOPLANTAR KERATODERMA IN A RUSSIAN FAMILY. Medical Genetics. 2018;17(7):46-51. (In Russ.) https://doi.org/10.25557/2073-7998.2018.07.46-51