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  • 1
    Digitale Medien
    Digitale Medien
    Genomic Organization Around the Centromeric End of the HLA Class I Region: Large-Scale Sequence Analysis (1999)
    Springer
    Journal of molecular evolution 48 (1999), S. 317-327 
    Details
    ISSN: 1432-1432
    Schlagwort(e): Key words: HLA class I — Genome duplication — LINE — Gene hunting — Genome evolution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract. We previously sequenced two regions around the centromeric end of HLA class I and the boundary between class I and class III. In this paper we analyze the two regions of about 385 kb and confirm, giving a new line of evidence, that the following two pairs of the genomic segments were duplicated in evolution: (i) a 43-kb genomic segment including the HLA-B gene showing the highest polymorphism among the classical HLA class I loci (class Ia) and a 40-kb segment including the HLA-C locus showing the lowest polymorphism and (ii) a 52-kb segment including the MIC (MHC class I chain related gene) B and a 35-kb segment including MICA. We also found that repetitive elements such as SINEs, LINEs, and LTRs occupy as much as 47% of nucleotides in this 385-kb region. This unusually high content of repetitive elements indicates that repeat-mediated rearrangements have frequently occurred in the evolutionary history of the HLA class Ia region. Analysis of LINE compositions within the two pairs of duplicated segments revealed that (i) LINEs in these regions had been dispersed prior to both the duplication of the HLA-B and -C loci and the duplication of the MICB and MICA loci, and (ii) the divergence of the HLA-B and -C loci occurred prior to the duplication of the MICA and MICB loci. To find novel genes responsible for HLA class I-associated or other diseases, we performed computer analysis applying GenScan and GRAIL to GenBank's dbEST. As a result, at least five as yet uncharacterized genes were newly mapped on the HLA class I centromeric region studied. These novel genes should be analyzed further to determine their relationships to diseases associated with this region.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00006475
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  • 2
    Digitale Medien
    Digitale Medien
    Comparison Between Two Human Endogenous Retrovirus (HERV)-Rich Regions Within the Major Histocompatibility Complex (1999)
    Springer
    Journal of molecular evolution 48 (1999), S. 675-683 
    Details
    ISSN: 1432-1432
    Schlagwort(e): Key words: Human endogenous retrovirus — Duplications — Multicopy genes — Major histocompatibility complex
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract. Sixteen human endogenous retrovirus (HERV) sequences were detected within 656 kb of genomic sequence obtained from the alpha- and beta-block of the class I region of the major histocompatibility complex (MHC). The HERVs were identified and characterized as family members of HERV-16 (11 copies), HERV-L (1 copy), HERV-I (2 copies), HERV-K91 (1 copy), and HARLEQUIN (1 copy) by sequence comparison using CENSOR or Repeat Masker, BLAST searches, and dot plots. The 11 copies of HERV-16 arose as products of duplication of genomic segments containing HLA class I (HLAcI) and PERB11 (MIC) genes inter alia, whereas the other five HERVs arose after duplication probably as a consequence of single insertion events or translocations. HERV-L and HERV-I are located between the duplicated genes PERB11.2 (MICB) and PERB11.1 (MICA), and HLA-B and HLA-C, respectively, whereas HERV-K91 and HARLEQUIN are located telomeric of HLA-C. A highly fragmented copy of HERV-I was also found telomeric of PERB11.4. Structural analysis of open reading frames (ORFs) revealed the absence of intact coding sequence within the putative gag, pol, and env gene regions of all the HERVs with the exception of HERV-K91, which had two large ORFs within the region of the putative protease and pol genes. In addition, the 5′-LTR of HERV-L contained a 2.5-kb element that was AT-rich and large ORFs with putative amino acid sequences rich in tyrosines and isoleucines. HERV-I, HARLEQUIN, and at least four copies of HERV-16 appear to have been receptors for the insertion of other retrotransposons including Alu elements and fragments of L1 and THE1. Examination of flanking sequences suggests that HERV-I and HERV-L had occurred by insertion into ancient L1 fragments. This study has revealed that the alpha- and beta-block region within the MHC is rich in HERV sequences occurring at a much higher ratio (10 to 1) than normally observed in the human genome. These HERV sequences will therefore enhance further studies on disease associations and differences between human haplotypes and primates and their role in the evolution of class I genes in the MHC.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00006511
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  • 3
    Digitale Medien
    Digitale Medien
    The Evolution of MHC Diversity by Segmental Duplication and Transposition of Retroelements (1997)
    Springer
    Journal of molecular evolution 45 (1997), S. 599-609 
    Details
    ISSN: 1432-1432
    Schlagwort(e): Key words: Retroelements — Segmental duplication — MHC — Diversity — Alu
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract. Sequence analysis of a 237 kb genomic fragment from the central region of the MHC has revealed that the HLA-B and HLA-C genes are contained within duplicated segments peri-B (53 kb) and peri-C (48 kb), respectively, and separated by an intervening sequence (IF) of 30 kb. The peri-B and peri-C segments share at least 90% sequence homology except when interrupted by insertions/deletions including Alu, L1, an endogenous retrovirus, and pseudogenes. The sequences of peri-B, IF, and peri-C were searched for the presence of Alu elements to use as markers of evolution, chromosomal rearrangements, and polymorphism. Of 29 Alu elements, 14 were identified in peri-B, 11 in peri-C, and 4 in IF. The Alu elements in peri-B and peri-C clustered phylogenetically into two clades which were classified as ``preduplication'' and ``postduplication'' clades. Four Alu J elements that are shared by peri-B and peri-C and are flanked by homologous sequences in their paralogous locations, respectively, clustered into a ``preduplication'' clade. By contrast, the majority of Alu elements, which are unique to either peri-B or peri-C, clustered into a postduplication clade together with the Alu consensus subfamily members ranging from platyrrhine-specific (Spqxcg) to catarrhine-specific Alu sequences (Y). The insertion of platyrrhine-specific Alu elements in postduplication locations of peri-B and peri-C implies that these two segments are the products of a duplication which occurred in primates prior to the divergence of the New World primate from the human lineage (35–44 mya). Examination of the paralogous Alu integration sites revealed that 9 of 14 postduplication Alu sequences have produced microsatellites of different length and sequence within the Alu 3′-poly A tail. The present analysis supports the hypothesis that HLA-B and HLA-C genes are products of an extended segmental duplication between 44 and 81 million years ago (mya), and that subsequent diversification of both genomic segments occurred because of the mobility and mutation of retroelements such as Alu repeats.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00006264
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  • 4
    Digitale Medien
    Digitale Medien
    The Evolution of MHC Diversity by Segmental Duplication and Transposition of Retroelements (1998)
    Springer
    Journal of molecular evolution 46 (1998), S. 734-734 
    Details
    ISSN: 1432-1432
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00006355
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  • 5
    Digitale Medien
    Digitale Medien
    Physical mapping of the retinoid X receptorB gene in mouse and human (1995)
    Springer
    Immunogenetics 41 (1995), S. 83-90 
    Details
    ISSN: 1432-1211
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract Retinoid X receptors (RXRs) are zinc finger-containing nuclear transcription factors. They belong to the nuclear receptor superfamily that contains retinoid receptors, vitamin D receptors, thyroid hormone receptors, and steroid hormone receptors as well as the so-called orphan receptors. We previously mapped all three RXR genes on mouse chromosomes, using a panel of Mus spretus-Mus musculus interspecific backcross mice: Namely, the RXRA- gene (Rxra) on Chr 2 near the centromere, the RXRB gene (Rxrb) on Chr 17 in the H2 region, and the RXRG gene (Rxrg) on distal Chr 1. Using cosmid clones that cover the major histocompatibility complex (MHC) region, we determined the precise physical map positions of the gene encoding mouse and human RXRB, respectively. The mouse gene (Rxrb) maps between H2-Ke4 and H2-Ke5: namely, immediately telomeric to H2-Ke4 which encodes a histidine-rich transmembrane protein, and 12 kilobases centromeric to H2-Ke5 which is expressed in lymphoid tissues. Rxrb and H2-Ke4 are transcribed into opposite directions from a CpG-rich promoter of about 250 base pairs. This gene organization is well conserved also in the human genome at the HLA-DP subregion of CHr 6p, underscoring the strong conservation of the gene organization in the MHC region between the two mammals.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00182317
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  • 6
    Digitale Medien
    Digitale Medien
    Isolation and characterization of cDNA clones for Japanese quail (Coturnix japonica) major histocompatibility complex (MhcCoja) class I molecules (1995)
    Springer
    Immunogenetics 42 (1995), S. 213-216 
    Details
    ISSN: 1432-1211
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00191227
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  • 7
    Digitale Medien
    Digitale Medien
    Nucleotide sequence of the human MHC class I MICA gene (1996)
    Springer
    Immunogenetics 44 (1996), S. 80-81 
    Details
    ISSN: 1432-1211
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002510050092
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  • 8
    Digitale Medien
    Digitale Medien
    Allelic repertoire of the human MHC class I MICA gene (1996)
    Springer
    Immunogenetics 44 (1996), S. 351-357 
    Details
    ISSN: 1432-1211
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract  The hallmark of the classical major histocompatibility complex (MHC) class I molecules is their astonishing level of polymorphism, a characteristic not shared by the nonclassical MHC class I genes. A distinct family of MHC class I genes has been recently identified within the human MHC class I region. The MICA (MHC class I chain-related A) gene in this family is a highly divergent member of the MHC class I family and has a unique pattern of tissue expression. We have sequenced exons encoding the extracellular α1, α2, and α3 domains of the MICA gene from twenty HLA homozygous typing cell lines and four unrelated individuals. We report the identification of eleven new alleles defined by a total of twenty-two amino acid substitutions. Thus, the total number of MICA alleles is sixteen. Interestingly, a tentative superimposition of MICA variable residues on the HLA-A2 structure reveals a unique pattern of distribution, concentrated primarily on the outer edge of the MICA putative antigen binding cleft, apparently bordering an invariant ligand binding site.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002510050136
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  • 9
    Digitale Medien
    Digitale Medien
    Allelic repertoire of the human MICB gene (1997)
    Springer
    Immunogenetics 46 (1997), S. 434-436 
    Details
    ISSN: 1432-1211
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002510050299
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  • 10
    Digitale Medien
    Digitale Medien
    MIC-A polymorphism in Japanese and a MIC-A-MIC-B null haplotype (1999)
    Springer
    Immunogenetics 49 (1999), S. 620-628 
    Details
    ISSN: 1432-1211
    Schlagwort(e): Key words MIC-A polymorphism ; PCR-SSCP ; HLA association ; Deletion ; Null haplotype
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract  A polymorphic gene, MIC-A, is one of the MIC family of genes which is composed of a group of homologous genes interspersed in the class III and class I regions of the major histocompatibility complex. MIC-A is located 46 kilobases (kb) centromeric of HLA-B, and is preferentially expressed in the epithelial cells and intestinal mucosa. Recently, MIC-A and the closely related MIC-B were reported as the molecules that conferred specificity in the recognition by the Vδ1γδT cells. In the present study, polymorphic exons 2, 3, and 4 of the MIC-A gene were analyzed using the polymerase chain reaction-single-strand conformation polymorphism method. The number of patterns found in exons 2, 3, and 4 were 5, 6, and 4, respectively, in 114 healthy Japanese subjects. Eight MIC-A alleles were observed in Japanese individuals, among which one, tentatively named MIC-AMW, has not previously been reported. There was a strong linkage disequilibrium between MIC-A and HLA-B loci: each MIC-A allele showed strong association with a particular HLA-B group. In contrast, B*3901 showed association with multiple MIC-A alleles. Furthermore, the existence of a MIC-A-MIC-B null haplotype, which is associated with HLA-B*4801, was identified. In this haplotype, a large-scale deletion (of approximately 100 kb) including the entire MIC-A gene was indicated and the MIC-B gene possessed a stop codon.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002510050658
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