A genome-wide association study of alloimmunization in the TOPMed OMG-SCD cohort identifies a locus on chromosome 12.

Autor: Sun Q; Department of Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA., Karafin MS; Department of Pathology and Laboratory Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA., Garrett ME; Duke Molecular Physiology Institute, Duke University Medical Center, Durham, North Carolina, USA., Li Y; Department of Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.; Department of Genetics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA., Ashley-Koch A; Duke Molecular Physiology Institute, Duke University Medical Center, Durham, North Carolina, USA., Telen MJ; Division of Hematology, Department of Medicine, Duke Comprehensive Sickle Cell Center, Duke University Medical Center, Durham, North Carolina, USA.
Jazyk: angličtina
Zdroj: Transfusion [Transfusion] 2024 Sep; Vol. 64 (9), pp. 1772-1783. Date of Electronic Publication: 2024 Jul 05.
DOI: 10.1111/trf.17944
Abstrakt: Background: Red cell alloimmunization after exposure to donor red cells is a very common complication of transfusion for patients with sickle cell disease (SCD), resulting frequently in accelerated donor red blood cell destruction. Patients show substantial differences in their predisposition to alloimmunization, and genetic variability is one proposed component. Although several genetic association studies have been conducted for alloimmunization, the results have been inconsistent, and the genetic determinants of alloimmunization remain largely unknown.
Study Design and Methods: We performed a genome-wide association study (GWAS) in 236 African American (AA) SCD patients from the Outcome Modifying Genes in Sickle Cell Disease (OMG-SCD) cohort, which is part of Trans-Omics for Precision Medicine (TOPMed), with whole-genome sequencing data available. We also performed sensitivity analyses adjusting for different sets of covariates and applied different sample grouping strategies based on the number of alloantibodies patients developed.
Results: We identified one genome-wide significant locus on chr12 (p = 3.1e-9) with no evidence of genomic inflation (lambda = 1.003). Further leveraging QTL evidence from GTEx whole blood and/or Jackson Heart Study PBMC RNA-Seq data, we identified a number of potential genes, such as ARHGAP9, STAT6, and ATP23, that may be driving the association signal. We also discovered some suggestive loci using different analysis strategies.
Discussion: We call for the community to collect additional alloantibody information within SCD cohorts to further the understanding of the genetic basis of alloimmunization in order to improve transfusion outcomes.
(© 2024 AABB.)
Databáze: MEDLINE
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