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. 2024 Feb 26;70(2):e20230872.
doi: 10.1590/1806-9282.20230872. eCollection 2024.

Association of NK cell subsets and cytotoxicity with FCGR3A gene polymorphism in functional NK cell deficiency

Mehmet Ali Karaselek  1 , Ercan Kurar  1 , Sevgi Keleş  2 , Şükrü Nail Güner  2 , İsmail Reisli  2
Affiliations

Association of NK cell subsets and cytotoxicity with FCGR3A gene polymorphism in functional NK cell deficiency

Mehmet Ali Karaselek et al. Rev Assoc Med Bras (1992). .

Abstract

Objective: The purpose of this study was to assess the association between clinical, laboratory, and functional analyses and polymorphism in the FCGR3A gene in individuals with functional NK cell deficiency.

Methods: A total of 15 functional NK cell deficiency patients and 10 age-matched healthy controls underwent NK cell subgroup, cytotoxicity, and FCGR3A whole-exome analysis with next-generation sequencing.

Results: Three different NK cell subsets (CD56brightCD16neg, CD56brightCD16int, and CD56dimCD16hi) were identified. No statistically significant difference was found in the ratio of CD56brightCD16neg cells between patients and controls. CD56brightCD16int and CD56dimCD16hi ratios were found to be significantly lower in patients. As a result of NK cell cytotoxicity analysis, a proportional decrease of K562 amount between patients and controls was found to be statistically significant (p<0.001). In the FCGR3A whole-exome analysis, all patients were found to be homozygous mutant for the c.526G > T (p.V176F) in exon 4, while three patients were homozygous wild type and 12 patients were heterozygous for the c.197T>A (p.L66H) in exon 3.

Conclusion: In this study, a group of pediatric patients with suspected functional NK cell deficiency were evaluated and the findings indicated that NK subsets, cytotoxicity results, and FCGR3A gene polymorphism were found to be correlated with the clinical features. We conclude that this kind of study might contribute to follow-up the patients in time.

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Conflict of interest statement

Conflicts of interest: the authors declare there is no conflicts of interest

Figures

Figure 1.
Figure 1.. Presentation of the detailed data interpretation and analysis.
Figure 2.
Figure 2.. (A) Distribution of NK subgroups in patients and controls. (B) Variation of different ratios in target cell amount in NK cell cytotoxicity analysis (*statistically significant; E:T: effector: target cell ratio).
See this image and copyright information in PMC

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