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Review
. 2019 Sep 11:10:2111.
doi: 10.3389/fimmu.2019.02111. eCollection 2019.

Flow Cytometry for Diagnosis of Primary Immune Deficiencies-A Tertiary Center Experience From North India

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Review

Flow Cytometry for Diagnosis of Primary Immune Deficiencies-A Tertiary Center Experience From North India

Amit Rawat et al. Front Immunol. .

Abstract

Flow cytometry has emerged as a useful technology that has facilitated our understanding of the human immune system. Primary immune deficiency disorders (PIDDs) are a heterogeneous group of inherited disorders affecting the immune system. More than 350 genes causing various PIDDs have been identified. While the initial suspicion and recognition of PIDDs is clinical, laboratory tools such as flow cytometry and genetic sequencing are essential for confirmation and categorization. Genetic sequencing, however, are prohibitively expensive and not readily available in resource constrained settings. Flow cytometry remains a simple, yet powerful, tool for multi-parametric analysis of cells. While it is confirmatory of diagnosis in certain conditions, in others it helps in narrowing the list of putative genes to be analyzed. The utility of flow cytometry in diagnosis of PIDDs can be divided into four major categories: (a) Enumeration of lymphocyte subsets in peripheral blood. (b) Detection of intracellular signaling molecules, transcription factors, and cytokines. (c) Functional assessment of adaptive and innate immune cells (e.g., T cell function in severe combined immune deficiency and natural killer cell function in familial hemophagocytic lymphohistiocytosis). (d) Evaluation of normal biological processes (e.g., class switching in B cells by B cell immunophenotyping). This review focuses on use of flow cytometry in disease-specific diagnosis of PIDDs in the context of a developing country.

Keywords: clinical applications; flow cytometry; immune deficiencies; immune dysregulation; primary immunodefciencies; recent advances.

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Figures

Figure 1
Figure 1
An overview of development of flow cytometry services for PIDs at our center. (A) Timeline showing the establishment of flow cytometry tests in the laboratory. (B) Timeline showing the increase in manpower and support for the laboratory services. (C) Bar graph showing the number of flow cytometry tests for PIDs performed in our laboratory in the last 5 years (#Data available from August 2015 to December 2015/*Data available from January 2019 to July 2019).

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