Chronic Mucocutaneous Candidiasis: characterisation of a family with STAT1 gain-of-function and development of an ex vivo assay for Th17 deficiency of diagnostic utility.

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Chronic Mucocutaneous Candidiasis: characterisation of a family with STAT1 gain-of-function and development of an ex vivo assay for Th17 deficiency of diagnostic utility.

Clin Exp Immunol. 2015 Dec 1;

Authors: Dhalla F, Fox H, Davenport EE, Sadler R, Anzilotti C, van Schouwenburg PA, Ferry B, Chapel H, Knight JC, Patel SY

Abstract
Chronic mucocutaneous candidiasis (CMC) is characterised by recurrent and persistent superficial infections with Candida albicans affecting the mucous membranes, skin and nails. It can be acquired or caused by primary immune deficiencies, particularly those that impair IL-17 and IL-22 immunity. We describe a single kindred with CMC and the identification of a STAT1 GOF mutation by whole exome sequencing (WES). We show how detailed clinical and immunological phenotyping of this family in the context of WES has enabled revision of disease status and clinical management. Together with analysis of other CMC cases within our cohort of patients, we used knowledge arising from the characterisation of this family to develop a rapid ex vivo screening assay for the detection of Th17 deficiency better suited to the routine diagnostic setting than established in vitro techniques, such as intracellular cytokine staining and ELISA using cell culture supernatants. We demonstrate that cell surface staining of unstimulated whole blood for CCR6+CXCR3-CCR4+CD161+ T-helper cells generates results that correlate with intracellular cytokine staining for IL-17A, and is able to discriminate between patients with molecularly defined CMC and healthy controls with 100% sensitivity and specificity within the cohort tested. Furthermore, removal of CCR4 and CD161 from the antibody staining panel did not affect assay performance, suggesting that the enumeration of CCR6+CXCR3- CD4+ T-cells is sufficient for screening for Th17 deficiency in patients with CMC and could be used to guide further investigation aimed at identifying the underlying molecular cause. This article is protected by copyright. All rights reserved.

PMID: 26621323 [PubMed - as supplied by publisher]