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Open Access Research article

Gene expression profile of the skin in the 'hairpoor' (HrHp) mice by microarray analysis

Bong-Kyu Kim1, In-Cheol Baek1, Hwa-Young Lee1, Jeong-Ki Kim1, Hae-Hiang Song2 and Sungjoo K Yoon1*

Author Affiliations

1 Department of Biomedical Sciences, The Catholic University of Korea, 505 Banpo-dong, Seoul 137-701, Korea

2 Division of Biostatistics and Department of Medical Life science, The Catholic University of Korea, 505 Banpo-dong, Seoul 137-701, Korea

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BMC Genomics 2010, 11:640  doi:10.1186/1471-2164-11-640

Published: 18 November 2010

Abstract

Background

The transcriptional cofactor, Hairless (HR), acts as one of the key regulators of hair follicle cycling; the loss of function mutations is the cause of the expression of the hairless phenotype in humans and mice. Recently, we reported a new Hr mutant mouse called 'Hairpoor' (HrHp). These mutants harbor a gain of the function mutation, T403A, in the Hr gene. This confers the overexpression of HR and HrHp is an animal model of Marie Unna hereditary hypotrichosis in humans. In the present study, the expression profile of HrHp/HrHp skin was investigated using microarray analysis to identify genes whose expression was affected by the overexpression of HR.

Results

From 45,282 mouse probes, differential expressions in 43 (>2-fold), 306 (>1.5-fold), and 1861 genes (>1.2-fold) in skin from HrHp/HrHp mice were discovered and compared with skin from wild-type mice. Among the 1861 genes with a > 1.2-fold increase in expression, further analysis showed that the expression of eight genes known to have a close relationship with hair follicle development, ascertained by conducting real-time PCR on skin RNA produced during hair follicle morphogenesis (P0-P14), indicated that four genes, Wif1, Casp14, Krt71, and Sfrp1, showed a consistent expression pattern with respect to HR overexpression in vivo.

Conclusion

Wif1 and Casp14 were found to be upregulated, whereas Krt71 and Sfrp1 were downregulated in cells overexpressing HR in transient transfection experiments on keratinocytes, suggesting that HR may transcriptionally regulate these genes. Further studies are required to understand the mechanism of this regulation by the HR cofactor.