A milieu of regulatory elements in the epidermal differentiation complex syntenic block: implications for atopic dermatitis and psoriasis.

Abstract:

:Two common inflammatory skin disorders with impaired barrier, atopic dermatitis (AD) and psoriasis, share distinct genetic linkage to the Epidermal Differentiation Complex (EDC) locus on 1q21. The EDC is comprised of tandemly arrayed gene families encoding proteins involved in skin cell differentiation. Discovery of semi-dominant mutations in filaggrin (FLG) associated with AD and a copy number variation within the LCE genes associated with psoriasis provide compelling evidence for the role of EDC genes in the pathogenesis of these diseases. To date, little is known about the potentially complex regulatory landscape within the EDC. Here, we report a computational approach to identify conserved non-coding elements (CNEs) in the EDC queried for regulatory function. Coordinate expression of EDC genes during mouse embryonic skin development and a striking degree of synteny and linearity in the EDC locus across a wide range of mammalian (placental and marsupial) genomes suggests an evolutionary conserved regulatory milieu in the EDC. CNEs identified by comparative genomics exhibit dynamic regulatory activity (enhancer or repressor) in differentiating or proliferating conditions. We further demonstrate epidermal-specific, developmental in vivo enhancer activities (DNaseI and transgenic mouse assays) in CNEs, including one within the psoriasis-associated deletion, LCE3C_LCE3B-del. Together, our multidisciplinary study features a network of regulatory elements coordinating developmental EDC gene expression as an unexplored resource for genetic variants in skin diseases.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

de Guzman Strong C,Conlan S,Deming CB,Cheng J,Sears KE,Segre JA

doi

10.1093/hmg/ddq019

subject

Has Abstract

pub_date

2010-04-15 00:00:00

pages

1453-60

issue

8

eissn

0964-6906

issn

1460-2083

pii

ddq019

journal_volume

19

pub_type

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