<b><i>Background:</i></b> Antibodies to human neutrophil alloantigens (HNA) are involved in the pathophysiology of several clinical conditions including transfusion-related acute lung injury (TRALI), alloimmune and autoimmune neutropenia, and febrile nonhemolytic transfusion reactions leading to neutropenia. The cognate antigens are polymorphic structures expressed on several glycoproteins on the neutrophils, i.e., antigens HNA-1a, -1b, -1c, and -1d on Fc-γ-receptor IIIb; HNA-2 on CD177; HNA-3a and -3b on choline transporter-like protein 2; HNA-4a and -4b on CD11b/αM subunit of the αMβ2-integrin (CD11b/CD18, Mac-1, CR3); and HNA-5a and -5b on αL-subunit (CD11a) of the αLβ2 integrin (CD11a/CD18), leukocyte function associated molecule (LFA)-1. Currently, there is a lacuna of diagnostic methods for detection of HNA in India. This study aimed to determine the HNA frequencies in Indians, estimate the risk of alloimmunization, and prepare typed neutrophil panels, which can be used to detect HNA antibodies in neutropenia cases. <b><i>Material and Methods:</i></b> EDTA blood samples were collected from random 1,054 blood donors. HNA-2 was phenotyped on fresh EDTA samples using FITC labelled monoclonal anti-CD177 by flowcytometry. HNA-1 (<i>FCGR3B</i>) genotyping was carried out by DNA sequencing and PCR-RFLP. Antigens of HNA-3 (<i>SLC44A2</i>) and HNA-5 (<i>ITGAL</i>) were genotyped by PCR-RFLP using <i>TaqαI</i> and <i>Bsp1286I</i> restriction enzymes, respectively, while HNA-4 (<i>ITGAM</i>) was genotyped by PCR-SSP. <b><i>Results:</i></b> Allele frequencies of <i>FCGR3B</i>*<i>01</i>, <i>FCGR3B</i>*<i>02</i>, and <i>FCGR3B</i>*<i>03</i> were found to be 0.433, 0.444, and 0.087, respectively. FCGR3B*01+*02+*03− was the most common genotype (33.78%). Ten individuals showed deficiency of FCGR3B individuals, while 23 showed hyperexpression, i.e., <i>FCGR3B</i>*<i>01+</i>*<i>02+</i>*<i>03+</i>. <i>FCGR3B</i>*<i>04</i>and *<i>05</i> occurred with a frequency of 0.002 and 0.024. HNA-2 was found to be a high frequency antigen occurring in 98.8% population. Four percent individuals showed atypical expression of CD177 on their neutrophils. Allele frequencies of <i>SLC44A2</i>*<i>01</i> and <i>SLC44A2</i>*<i>02</i>were 0.812 and 0.188, respectively, and that of <i>ITGAM</i>*<i>01</i>, <i>ITGAM</i>*<i>02</i>, <i>ITGAL</i>*<i>01</i>, and <i>ITGAL</i>*<i>02</i> were 0.9546, 0.0454, 0.2372, and 0.7628, respectively. <b><i>Conclusion:</i></b> This is the first study in India to report the frequencies of HNA among blood donors. Typed neutrophil panels identified in the present study will enable us to investigate suspected cases of immune neutropenia in future.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2025 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.