Estimation of German KIR Allele Group Haplotype Frequencies

The impact of the highly polymorphic Killer-cell immunoglobulin-like receptor ( ) gene cluster on the outcome of hematopoietic stem cell transplantation (HCST) is subject of current research. To further understand the involvement of this gene family into Natural Killer (NK) cell-mediated graft-versu...

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Published inFrontiers in immunology Vol. 11; p. 429
Main Authors Solloch, Ute V., Schefzyk, Daniel, Schäfer, Gesine, Massalski, Carolin, Kohler, Maja, Pruschke, Jens, Heidl, Annett, Schetelig, Johannes, Schmidt, Alexander H., Lange, Vinzenz, Sauter, Jürgen
Format Journal Article
LanguageEnglish
Published Switzerland Frontiers Media S.A 12.03.2020
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ISSN1664-3224
1664-3224
DOI10.3389/fimmu.2020.00429

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Abstract The impact of the highly polymorphic Killer-cell immunoglobulin-like receptor ( ) gene cluster on the outcome of hematopoietic stem cell transplantation (HCST) is subject of current research. To further understand the involvement of this gene family into Natural Killer (NK) cell-mediated graft-versus-leukemia reactions, knowledge of haplotype structures, and allelic linkage is of importance. In this analysis, we estimate population-specific haplotype frequencies at allele group resolution in a cohort of = 458 German families. We addressed the polymorphism of the gene complex and phasing ambiguities by a combined approach. Haplotype inference within first-degree family relations allowed us to limit the number of possible diplotypes. Structural restriction to a pattern set of 92 previously described copy number haplotypes further reduced ambiguities. haplotype frequency estimation was finally accomplished by means of an expectation-maximization algorithm. Applying a resolution threshold of ½ , we were able to identify a set of 551 allele group haplotypes, representing 21 copy number haplotypes. The haplotype frequencies allow studying linkage disequilibrium in two-locus as well as in multi-locus analyses. Our study reveals associations between haplotype structures and allele group frequencies, thereby broadening our understanding of the gene complex.
AbstractList The impact of the highly polymorphic Killer-cell immunoglobulin-like receptor (KIR) gene cluster on the outcome of hematopoietic stem cell transplantation (HCST) is subject of current research. To further understand the involvement of this gene family into Natural Killer (NK) cell-mediated graft-versus-leukemia reactions, knowledge of haplotype structures, and allelic linkage is of importance. In this analysis, we estimate population-specific KIR haplotype frequencies at allele group resolution in a cohort of n = 458 German families. We addressed the polymorphism of the KIR gene complex and phasing ambiguities by a combined approach. Haplotype inference within first-degree family relations allowed us to limit the number of possible diplotypes. Structural restriction to a pattern set of 92 previously described KIR copy number haplotypes further reduced ambiguities. KIR haplotype frequency estimation was finally accomplished by means of an expectation-maximization algorithm. Applying a resolution threshold of ½ n, we were able to identify a set of 551 KIR allele group haplotypes, representing 21 KIR copy number haplotypes. The haplotype frequencies allow studying linkage disequilibrium in two-locus as well as in multi-locus analyses. Our study reveals associations between KIR haplotype structures and allele group frequencies, thereby broadening our understanding of the KIR gene complex.
The impact of the highly polymorphic Killer-cell immunoglobulin-like receptor (KIR) gene cluster on the outcome of hematopoietic stem cell transplantation (HCST) is subject of current research. To further understand the involvement of this gene family into Natural Killer (NK) cell-mediated graft-versus-leukemia reactions, knowledge of haplotype structures, and allelic linkage is of importance. In this analysis, we estimate population-specific KIR haplotype frequencies at allele group resolution in a cohort of n = 458 German families. We addressed the polymorphism of the KIR gene complex and phasing ambiguities by a combined approach. Haplotype inference within first-degree family relations allowed us to limit the number of possible diplotypes. Structural restriction to a pattern set of 92 previously described KIR copy number haplotypes further reduced ambiguities. KIR haplotype frequency estimation was finally accomplished by means of an expectation-maximization algorithm. Applying a resolution threshold of ½ n, we were able to identify a set of 551 KIR allele group haplotypes, representing 21 KIR copy number haplotypes. The haplotype frequencies allow studying linkage disequilibrium in two-locus as well as in multi-locus analyses. Our study reveals associations between KIR haplotype structures and allele group frequencies, thereby broadening our understanding of the KIR gene complex.The impact of the highly polymorphic Killer-cell immunoglobulin-like receptor (KIR) gene cluster on the outcome of hematopoietic stem cell transplantation (HCST) is subject of current research. To further understand the involvement of this gene family into Natural Killer (NK) cell-mediated graft-versus-leukemia reactions, knowledge of haplotype structures, and allelic linkage is of importance. In this analysis, we estimate population-specific KIR haplotype frequencies at allele group resolution in a cohort of n = 458 German families. We addressed the polymorphism of the KIR gene complex and phasing ambiguities by a combined approach. Haplotype inference within first-degree family relations allowed us to limit the number of possible diplotypes. Structural restriction to a pattern set of 92 previously described KIR copy number haplotypes further reduced ambiguities. KIR haplotype frequency estimation was finally accomplished by means of an expectation-maximization algorithm. Applying a resolution threshold of ½ n, we were able to identify a set of 551 KIR allele group haplotypes, representing 21 KIR copy number haplotypes. The haplotype frequencies allow studying linkage disequilibrium in two-locus as well as in multi-locus analyses. Our study reveals associations between KIR haplotype structures and allele group frequencies, thereby broadening our understanding of the KIR gene complex.
The impact of the highly polymorphic Killer-cell immunoglobulin-like receptor ( ) gene cluster on the outcome of hematopoietic stem cell transplantation (HCST) is subject of current research. To further understand the involvement of this gene family into Natural Killer (NK) cell-mediated graft-versus-leukemia reactions, knowledge of haplotype structures, and allelic linkage is of importance. In this analysis, we estimate population-specific haplotype frequencies at allele group resolution in a cohort of = 458 German families. We addressed the polymorphism of the gene complex and phasing ambiguities by a combined approach. Haplotype inference within first-degree family relations allowed us to limit the number of possible diplotypes. Structural restriction to a pattern set of 92 previously described copy number haplotypes further reduced ambiguities. haplotype frequency estimation was finally accomplished by means of an expectation-maximization algorithm. Applying a resolution threshold of ½ , we were able to identify a set of 551 allele group haplotypes, representing 21 copy number haplotypes. The haplotype frequencies allow studying linkage disequilibrium in two-locus as well as in multi-locus analyses. Our study reveals associations between haplotype structures and allele group frequencies, thereby broadening our understanding of the gene complex.
Author Schäfer, Gesine
Schefzyk, Daniel
Massalski, Carolin
Lange, Vinzenz
Pruschke, Jens
Solloch, Ute V.
Sauter, Jürgen
Kohler, Maja
Heidl, Annett
Schmidt, Alexander H.
Schetelig, Johannes
AuthorAffiliation 1 DKMS , Tübingen , Germany
3 University Hospital Carl Gustav Carus , Dresden , Germany
2 DKMS Life Science Lab , Dresden , Germany
AuthorAffiliation_xml – name: 2 DKMS Life Science Lab , Dresden , Germany
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Copyright © 2020 Solloch, Schefzyk, Schäfer, Massalski, Kohler, Pruschke, Heidl, Schetelig, Schmidt, Lange and Sauter. 2020 Solloch, Schefzyk, Schäfer, Massalski, Kohler, Pruschke, Heidl, Schetelig, Schmidt, Lange and Sauter
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Keywords immunogenetics
donor selection
KIR
HSCT
haplotype frequency
Language English
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This article was submitted to Alloimmunity and Transplantation, a section of the journal Frontiers in Immunology
Edited by: Martin Maiers, National Marrow Donor Program, United States
Reviewed by: Lisbeth Guethlein, Stanford University, United States; Carlos Vilches, Hospital Universitario Puerta de Hierro Majadahonda, Spain; Lihua Hou, Georgetown University, United States
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Snippet The impact of the highly polymorphic Killer-cell immunoglobulin-like receptor ( ) gene cluster on the outcome of hematopoietic stem cell transplantation (HCST)...
The impact of the highly polymorphic Killer-cell immunoglobulin-like receptor (KIR) gene cluster on the outcome of hematopoietic stem cell transplantation...
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SubjectTerms Alleles
Cohort Studies
donor selection
European Continental Ancestry Group - genetics
Gene Frequency
Germany
haplotype frequency
Haplotypes
HSCT
Humans
immunogenetics
Immunology
KIR
Receptors, KIR - genetics
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Title Estimation of German KIR Allele Group Haplotype Frequencies
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