A mutation in the SUV39H2 gene in Labrador Retrievers with hereditary nasal parakeratosis (HNPK) provides insights into the epigenetics of keratinocyte differentiation.

Abstract:

:Hereditary nasal parakeratosis (HNPK), an inherited monogenic autosomal recessive skin disorder, leads to crusts and fissures on the nasal planum of Labrador Retrievers. We performed a genome-wide association study (GWAS) using 13 HNPK cases and 23 controls. We obtained a single strong association signal on chromosome 2 (p(raw) = 4.4×10⁻¹⁴). The analysis of shared haplotypes among the 13 cases defined a critical interval of 1.6 Mb with 25 predicted genes. We re-sequenced the genome of one case at 38× coverage and detected 3 non-synonymous variants in the critical interval with respect to the reference genome assembly. We genotyped these variants in larger cohorts of dogs and only one was perfectly associated with the HNPK phenotype in a cohort of more than 500 dogs. This candidate causative variant is a missense variant in the SUV39H2 gene encoding a histone 3 lysine 9 (H3K9) methyltransferase, which mediates chromatin silencing. The variant c.972T>G is predicted to change an evolutionary conserved asparagine into a lysine in the catalytically active domain of the enzyme (p.N324K). We further studied the histopathological alterations in the epidermis in vivo. Our data suggest that the HNPK phenotype is not caused by hyperproliferation, but rather delayed terminal differentiation of keratinocytes. Thus, our data provide evidence that SUV39H2 is involved in the epigenetic regulation of keratinocyte differentiation ensuring proper stratification and tight sealing of the mammalian epidermis.

journal_name

PLoS Genet

journal_title

PLoS genetics

authors

Jagannathan V,Bannoehr J,Plattet P,Hauswirth R,Drögemüller C,Drögemüller M,Wiener DJ,Doherr M,Owczarek-Lipska M,Galichet A,Welle MM,Tengvall K,Bergvall K,Lohi H,Rüfenacht S,Linek M,Paradis M,Müller EJ,Roosje P,Leeb

doi

10.1371/journal.pgen.1003848

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

e1003848

issue

10

eissn

1553-7390

issn

1553-7404

pii

PGENETICS-D-13-01768

journal_volume

9

pub_type

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