Conservation of Mhc Class III Region Synteny Between Zebrafish and Human as Determined by Radiation Hybrid Mapping1

Conservation of Mhc Class III Region Synteny Between Zebrafish and Human as Determined by Radiation Hybrid Mapping1
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通过辐射杂交作图确定斑马鱼和人类之间 Mhc III 类区域同线性的保守性1

DOI:
10.4049/jimmunol.165.12.6984
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发表时间:
2000
期刊:
The Journal of Immunology
影响因子:
--
通讯作者:
J. Klein
J. Klein
中科院分区:
--
文献类型:
--
作者:
H. Sültmann;A. Sato;B. W. Murray;N. Takezaki;R. Geisler;Gerd;J. Klein

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在人类白细胞抗原、H2和其他哺乳动物MHC中,I类和II类基因由所谓的III类区域分隔,该区域由∼60基因组成,这些基因在功能上和进化上与I/II类基因无关。为了探索这一位于19个HLAIII类基因同源基因中间的无关基因岛的起源,我们在斑马鱼中鉴定了19个HLAIII类基因的同源基因以及另外21个非I/II类HLA同源基因,并通过测试94个斑马鱼-仓鼠辐射杂交细胞系对它们进行了定位。在19个连锁群中,发现6个HLAIII类和8个侧翼同源物与斑马鱼I类(而不是II类)基因座连锁,其余同源基因座分布在14个斑马鱼连锁群中。19号连锁群包含至少25个基因(不包括I类基因),这些基因也是人类6号染色体上的同线基因。这种基因组合可能代表了I/II类基因出现之前存在的前MHC。MHC前病毒可能不包含补体和其他参与免疫反应的III类基因。
In the HLA, H2, and other mammalian Mhc, the class I and II loci are separated by the so-called class III region comprised of ∼60 genes that are functionally and evolutionarily unrelated to the class I/II genes. To explore the origin of this island of unrelated loci in the middle of the Mhc 19 homologues of HLA class III genes, we identified 19 homologues of HLA class III genes as well as 21 additional non-class I/II HLA homologues in the zebrafish and mapped them by testing a panel of 94 zebrafish-hamster radiation hybrid cell lines. Six of the HLA class III and eight of the flanking homologues were found to be linked to the zebrafish class I (but not class II) loci in linkage group 19. The remaining homologous loci were found to be scattered over 14 zebrafish linkage groups. The linkage group 19 contains at least 25 genes (not counting the class I loci) that are also syntenic on human chromosome 6. This gene assembly presumably represents the pre-Mhc that existed before the class I/II genes arose. The pre-Mhc may not have contained the complement and other class III genes involved in immune response.
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