Abstract Session I - MHC and Related Genes
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Genes and Immunity (2003) 4, S1–S75 & 2003 Nature Publishing Group All rights reserved 1466-4879/03 $25.00 www.nature.com/gene Abstract Session I - MHC and Related Genes 1 2 EVOLUTION OF THE KIR REGION IN THE GREAT APES KILLER IMMUNOGLOBULIN LIKE RECEPTOR 3DL2 ALLELE DIVERSITY IDENTIFIED BY PCR-SSOP Lisbeth A. Guethlein, Laurent Abi-Rached, Raja Rajalingam, and Peter Parham Fionnuala Williams, Carole Sleator, Ashley Meenagh, Derek Middleton. Stanford University, Stanford, CA, USA Histocompatibility & Immunogenetics Laboratory, City Hospital, Belfast, Northern Ireland. The killer cell immunoglobulin-like receptors (KIRs) comprise a gene family that is highly polymorphic and rapidly evolving. To aid in understanding the The killer immunoglobulin-like receptor (KIR) genes are a compact cluster evolutionary dynamics shaping this family, we have studied the genomic of genes located in human chromosome 19q13.4. Polymorphic variation organization of the KIR region in the chimpanzee and the orangutan. Previous within the known genes is now emerging, indicating allelic diversity for analysis of expressed KIR genes in these species has shown conservation of all each KIR gene. major KIR lineages although the number and nature of KIR within in each A method identifying KIR 3DL2 allele variation based on PCR-SSOP has lineage varies. been developed for the discrimination of 12 named 3DL2 alleles Analysis of two haplotypes each from chimpanzee and orangutan has revealed conservation of the flanking genes LILR (leukoctye immunglobulin-like (3DL2*001 - *012). Nucleotide sequence submissions, were retrieved from receptor) and FCAR (Fc alpha receptor) in both species. Additionally, all the GenBank databank (www.ncbi.nlm.nih.gov) and aligned to aid primer haplotypes appear to correspond to the centromeric half of the human KIR and probe selection. Two regions of the 3DL2 gene were specifically region, suggesting that this may be the ancestral organization of the region. The amplified in separate PCR products (approx. 1440 & 348 base pairs haplotypes in the orangutan and chimpanzee include orthologues for two of the respectively), the larger product containing exon 3 through to exon 4 of the three framework genes described in man. The first, KIR3DL3 (KIRCI), which is KIR 3DL2 gene, with the smaller product containing exon 8 through to exon adjacent to the LILR region, is found in a similar position in the orangutan and 9. The combined products were challenged with a total of twenty chimpanzee haplotypes. However, in both chimpanzee haplotypes studied, there digoxigenin labelled probes, designed from the amplified 3DL2 regions. is another KIR, Pt-KIR2DL5, that is located between the Pt-LILRs and Pt- Application of this method to a Northern Irish healthy control group KIRCI. The other framework gene, KIR2DL4, is found in the center of the (n=162), has shown good allele diversity within this gene with identification human KIR region. In both chimpanzee and orangutan KIR2DL4 is the penultimate gene in the complex with a KIR3DL gene located between it and of 10/12 alleles (3DL2*004 & *012 not identified). 3DL2*001 and *002 the FCAR gene. Our analysis has also verified conservation of the intron/exon were identified as the most common alleles in this Caucasian group, structure of these genes. Knowledge of the genomic structure, discovery of occurring at equal frequencies (20.3%). Three ambiguous heterozygous additional pseudogene sequence, and determination of intron sequence have combinations remain following SSOP typing (3DL2*001, *011 from *003, provided invaluable information for the phylogenetic reconstruction of the 3DL2*010; *001, *007 from *006, *010; 3DL2*003, *007 from *006, evolutionary history of the KIR region in the great apes. *011). Due to sequence complications these combinations would also be difficult to resolve using alternative methods such as SSP and SBT. The method has also been applied to the 13th IHW NK cell line panel (n=84), twelve CEPH families (n=48), also from the NK component of the 13th IHW, and eight Northern Irish families (n=42). The 3DL2 alleles segregated as expected within all family units. Investigation of 2 Northern Irish individuals and 4 cell lines, producing unusual SSOP patterns is currently underway. 34 NOVEL KIR GENE DUPLICATION IDENTIFIED THROUGH MOLECULAR CHARACTERIZATION OF RHESUS MONKEY PCR-SSOP DETECTION OF 2DL4 ALLELES MHC-DR REGION: FULL LENGTH CDRB/CDRA ANALYSIS Fionnuala Williams, Lynn D. Maxwell, Iris Halfpenny, Ashley Nanine de Groot, Gaby G.M. Doxiadis, Nel Otting, Natasja G. de Meenagh, Carole Sleator, Derek Middleton. Groot, Corrine M.C. Heijmans and Ronald E. Bontrop Histocompatibility & Immunogenetics Laboratory, City Hospital, Belfast. Department of Genetics and Refinement, Biomedical Primate In addition to the variable gene content observed within killer immunoglobulin-like Research Centre, Rijswijk, The Netherlands receptor (KIR) genes, significant allelic diversity is now emerging. A PCR-SSOP method identifying KIR 2DL4 allele variation has been developed. The rhesus macaque (Macaca mulatta) is an important animal model in studies PCR products (approx. 1440 base pairs) containing the D0 and D2 domains of the KIR on chronic and infectious diseases. In contrast to humans, sequence analysis of 2DL4 gene were specifically generated with primers flanking this region. Sixteen exon 2 of Mamu-DRB genes from pedigreed rhesus macaques showed a high digoxigenin labelled probes were designed to provide distinct discrimination of 10 degree of polymorphism regarding number and content of -DRB genes per possible 2DL4 variant alleles. haplotype. However, little is known about the expression or functionality of The application of the 2DL4 allele system has identified individuals (n=11) these genes. Until now, only three cDRB sequences have been published and the possessing three alleles of this gene. This event has been confirmed by isolating three cDRA gene was thought to be monomorpic. Therefore, Mamu-cDRA sequences distinct allele clones in each individual, which sequenced as the alleles identified by were analysed in B-cell lines of 12 consanguinious, as well as homozygous and SSOP. Investigation of the full KIR types of these individuals reveals a common heterozygous rhesus macaques with known Mhc haplotypes. A total of at least 8 connection with respect to our previously reported 3DS1/3DL1 three allele event1. It is different cDRA alleles could be distinguished, resulting in 4 distinct gene our assumption that a cross over event has occurred between differing KIR haplotypes products. The amino acid differences have been found in the leader peptide and resulting in the duplication of the 2DL4, 3DS1/3DL1 genes, and others, on the newly in the cytoplasmatic tail, whereas the alpha 1 domain with the antigen-binding formed haplotype. Interestingly, the 2DL4 type of child within a 13th IHW CEPH positions remains invariant. Furthermore, from 10 B-cell lines of family did not initially agree with family inheritance. DNA cloning and sequencing consanguinious, as well as homozygous and heterozygous rhesus macaques, 19 was performed, confirming the SSOP type. Three 2DL4 alleles have now been distinct cDRB alleles have been determinend. This indicates that the analysed identified in the mother of this child - SSOP identified two of these alleles with the rhesus macaques express one, two, or three –DRB genes per haplotype. These third allele hidden within the SSOP pattern. The presence of three maternal alleles full length cDRA and cDRB sequences are needed to construct various explains the typing of the offspring. This highlights a problem when typing for 2DL4 tetrameric recombinant Mhc class II-peptide complexes as well as to establish alleles - the gene duplication occurs in 1% of individuals tested and the third allele transfectant cell lines, which are useful for HIV/SHIV and autoimmune disease may not always be apparent with SSOP typing alone. studies. The typing method was applied to a Northern Irish healthy control group (n=162), identifying only five of the ten alleles (2DL4*00201, *00202, *005, *006 & *007). The same five alleles were again observed as the only 2DL4 alleles present within the 13th IHW NK cell line panel (n=84), twelve 13th IHW CEPH families (n=48) and forty Northern Irish families (n=220). The five alleles segregated as expected within all family units. The remaining 2DL4 alleles were not detected in various other population groups studied (Omani, Hong Kong, Cuban Mulatto, South African Xhosa). Therefore it seems likely that the other five allele sequences not detected in this study represent rare alleles or sequence artefacts. 1Crum et al., 2000, Tissue Antigens 56: 313 - 326. Abstracts S2 5 6 EVOLUTIONARY STABILITY OF MHC CLASS II THE “NON-CLASSICAL” MIC GENE IN CHIMPANZEES HAPLOTYPES IN DIFFERENT RHESUS MACAQUE SHOWS REDUCED EXON/INTRON VARIATION AS POPULATIONS COMPARED TO HUMANS Gaby G.M. Doxiadis, Nel Otting, Natasja G. de Groot, Annemiek Natasja G. de Groot1, Christian A. Garcia2, Gaby G.M. Doxiadis1, Rouweler, Nanine de Groot, Riet Noort, Ernst Verschoor and Ronald Steven G.E. Marsh2 and Ronald E. Bontrop1 E. Bontrop 1Biomedical Primate Research Centre, Department of Genetics and Department of Genetics and Refinement, Biomedical Primate Refinement, Lange Kleiweg 139, Rijswijk, The Netherlands, 2Royal Research Centre, Rijswijk, The Netherlands Free Hospital, Pont Street, Hampstead, London NW3 3QG, UK Exon 2 of the polymorphic Mamu -DPB1, -DQA1, -DQB1 and -DRB loci has In humans the Major Histocompatibility Complex class I chain related gene been analysed from 173 pedigreed rhesus macaques from the BPRC’s breeding (MIC) is a multicopy gene family showing similarity to HLA-A, -B and -C. colony. Most of the animals or their ancestors originate from India. The panel Only the MICA and MICB genes have a functional transcript in humans. In also includes animals from Burma, China, and even some of unknown origin, chimpanzees only one MIC gene is expressed, and the corresponding and mixed breeds. MtDNA variation appears to correlate with the above- phylogenetic tree of the exons reflects an intermediate character between the described geographic origin.