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Whole exome sequencing identifies LRP1 as a pathogenic gene in autosomal recessive keratosis pilaris atrophicans
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medicinsk genetik och genomik. Uppsala University, Science for Life Laboratory, SciLifeLab.ORCID iD: 0000-0003-4185-7409
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medicinsk genetik och genomik. Uppsala University, Science for Life Laboratory, SciLifeLab.ORCID iD: 0000-0002-4383-9880
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2015 (English)In: Journal of Medical Genetics, ISSN 0022-2593, E-ISSN 1468-6244, Vol. 52, no 9, 599-606 p.Article in journal (Refereed) Published
Abstract [en]

Background Keratosis pilaris atrophicans (KPA) is a group of rare genodermatoses characterised by perifollicular keratosis and inflammation that progresses to atrophy and scars of the facial skin. Keratosis pilaris of extensor areas of limbs is a common associated finding. Most cases with KPA are sporadic and no consistent inheritance pattern has been documented.

Methods A large consanguineous Pakistani pedigree segregating autosomal recessive KPA of a mixed type was subject to autozygosity mapping and whole exome sequencing. Quantification of mRNA and protein levels was performed on fibroblasts from affected individuals. Cellular uptake of the low-density lipoprotein (LDL) receptor-related protein 1 (LRP1) ligand alpha 2-macroglobulin (alpha M-2) was quantified using fluorescence confocal microscopy.

Results Genetic analyses identified a unique homozygous missense variant (K1245R) in the LRP1 in all affected family members. LRP1 encodes the LRP1, a multifunctional cell surface receptor with endocytic functions that belongs to the LDL receptor family. The LRP1 mRNA and LRP1 protein levels in fibroblasts of affected individuals were markedly reduced when compared with controls. Similarly, the LRP1-mediated cellular uptake of alpha M-2 was reduced in patient fibroblasts.

Conclusions This is the first report on LRP1 as a pathogenic gene for autosomal recessive KPA and keratosis pilaris. The inflammatory characteristics of the KPA entity in our family suggest a link to the immune-regulatory functions of LRP1.

Place, publisher, year, edition, pages
2015. Vol. 52, no 9, 599-606 p.
National Category
Medical Genetics
Identifiers
URN: urn:nbn:se:uu:diva-262413DOI: 10.1136/jmedgenet-2014-102931ISI: 000359997600005PubMedID: 26142438OAI: oai:DiVA.org:uu-262413DiVA: diva2:855150
Funder
Swedish Research Council, K2013-66X-10829-20-3Swedish Society for Medical Research (SSMF)
Note

De två första författarna delar förstaförfattarskapet.

Available from: 2015-09-18 Created: 2015-09-15 Last updated: 2017-12-05Bibliographically approved

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Klar, JoakimSchuster, JensForsberg, Lars A.Dahl, Niklas

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Medicinsk genetik och genomikScience for Life Laboratory, SciLifeLabDepartment of Immunology, Genetics and Pathology
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