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Mutations in SULT2B1 Cause Autosomal-Recessive Congenital Ichthyosis in Humans

Heinz, Lisa ; Kim, Gwang Jin ; Marrakchi, Slaheddine ; Christiansen, Julie ; Turki, Hamida ; Rauschendorf, Marc Alexander ; Lathrop, Mark ; Hausser, Ingrid ; Zimmer, Andreas D. and Fischer, Judith (2017) In American Journal of Human Genetics 100(6). p.926-939
Abstract

Ichthyoses are a clinically and genetically heterogeneous group of genodermatoses associated with abnormal scaling of the skin over the whole body. Mutations in nine genes are known to cause non-syndromic forms of autosomal-recessive congenital ichthyosis (ARCI). However, not all genetic causes for ARCI have been discovered to date. Using whole-exome sequencing (WES) and multigene panel screening, we identified 6 ARCI-affected individuals from three unrelated families with mutations in Sulfotransferase family 2B member 1 (SULT2B1), showing their causative association with ARCI. Cytosolic sulfotransferases form a large family of enzymes that are involved in the synthesis and metabolism of several steroids in humans. We identified four... (More)

Ichthyoses are a clinically and genetically heterogeneous group of genodermatoses associated with abnormal scaling of the skin over the whole body. Mutations in nine genes are known to cause non-syndromic forms of autosomal-recessive congenital ichthyosis (ARCI). However, not all genetic causes for ARCI have been discovered to date. Using whole-exome sequencing (WES) and multigene panel screening, we identified 6 ARCI-affected individuals from three unrelated families with mutations in Sulfotransferase family 2B member 1 (SULT2B1), showing their causative association with ARCI. Cytosolic sulfotransferases form a large family of enzymes that are involved in the synthesis and metabolism of several steroids in humans. We identified four distinct mutations including missense, nonsense, and splice site mutations. We demonstrated the loss of SULT2B1 expression at RNA and protein levels in keratinocytes from individuals with ARCI by functional analyses. Furthermore, we succeeded in reconstructing the morphologic skin alterations in a 3D organotypic tissue culture model with SULT2B1-deficient keratinocytes and fibroblasts. By thin layer chromatography (TLC) of extracts from these organotypic cultures, we could show the absence of cholesterol sulfate, the metabolite of SULT2B1, and an increased level of cholesterol, indicating a disturbed cholesterol metabolism of the skin upon loss-of-function mutation in SULT2B1. In conclusion, our study reveals an essential role for SULT2B1 in the proper development of healthy human skin. Mutation in SULT2B1 leads to an ARCI phenotype via increased proliferation of human keratinocytes, thickening of epithelial layers, and altered epidermal cholesterol metabolism.

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author
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publishing date
type
Contribution to journal
publication status
published
subject
keywords
3D skin tissue culture model, autosomal-recessive congenital ichthyosis, cholesterol sulfate cycle, epidermal differentiation, epidermal proliferation, epidermis, exome sequencing, ichthyosis, skin permeability barrier, SULT2B1
in
American Journal of Human Genetics
volume
100
issue
6
pages
14 pages
publisher
Cell Press
external identifiers
  • scopus:85020073373
  • pmid:28575648
ISSN
0002-9297
DOI
10.1016/j.ajhg.2017.05.007
language
English
LU publication?
no
id
57ac9afe-78ac-4d6a-8c79-9f58d2a0b4f4
date added to LUP
2020-04-23 09:01:42
date last changed
2020-11-24 02:12:52
@article{57ac9afe-78ac-4d6a-8c79-9f58d2a0b4f4,
  abstract     = {<p>Ichthyoses are a clinically and genetically heterogeneous group of genodermatoses associated with abnormal scaling of the skin over the whole body. Mutations in nine genes are known to cause non-syndromic forms of autosomal-recessive congenital ichthyosis (ARCI). However, not all genetic causes for ARCI have been discovered to date. Using whole-exome sequencing (WES) and multigene panel screening, we identified 6 ARCI-affected individuals from three unrelated families with mutations in Sulfotransferase family 2B member 1 (SULT2B1), showing their causative association with ARCI. Cytosolic sulfotransferases form a large family of enzymes that are involved in the synthesis and metabolism of several steroids in humans. We identified four distinct mutations including missense, nonsense, and splice site mutations. We demonstrated the loss of SULT2B1 expression at RNA and protein levels in keratinocytes from individuals with ARCI by functional analyses. Furthermore, we succeeded in reconstructing the morphologic skin alterations in a 3D organotypic tissue culture model with SULT2B1-deficient keratinocytes and fibroblasts. By thin layer chromatography (TLC) of extracts from these organotypic cultures, we could show the absence of cholesterol sulfate, the metabolite of SULT2B1, and an increased level of cholesterol, indicating a disturbed cholesterol metabolism of the skin upon loss-of-function mutation in SULT2B1. In conclusion, our study reveals an essential role for SULT2B1 in the proper development of healthy human skin. Mutation in SULT2B1 leads to an ARCI phenotype via increased proliferation of human keratinocytes, thickening of epithelial layers, and altered epidermal cholesterol metabolism.</p>},
  author       = {Heinz, Lisa and Kim, Gwang Jin and Marrakchi, Slaheddine and Christiansen, Julie and Turki, Hamida and Rauschendorf, Marc Alexander and Lathrop, Mark and Hausser, Ingrid and Zimmer, Andreas D. and Fischer, Judith},
  issn         = {0002-9297},
  language     = {eng},
  number       = {6},
  pages        = {926--939},
  publisher    = {Cell Press},
  series       = {American Journal of Human Genetics},
  title        = {Mutations in SULT2B1 Cause Autosomal-Recessive Congenital Ichthyosis in Humans},
  url          = {http://dx.doi.org/10.1016/j.ajhg.2017.05.007},
  doi          = {10.1016/j.ajhg.2017.05.007},
  volume       = {100},
  year         = {2017},
}