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MHC Ⅱ类区域与绵羊对肠道寄生虫的抗性。

The MHC class II region and resistance to an intestinal parasite in sheep.

机构信息

McMaster Laboratory, CSIRO Division of Animal Health, Private Bag 1, Glebe, NSW, Australia. Dept. Animal Science, University of Sydney, NSW, Australia. Pastoral Research Laboratory, CSIRO Division of Animal Health, Armidale, NSW, Australia.

出版信息

J Anim Breed Genet. 1993 Jan 12;110(1-6):459-72. doi: 10.1111/j.1439-0388.1993.tb00758.x.

DOI:10.1111/j.1439-0388.1993.tb00758.x
PMID:21395744
Abstract

RFLP analysis was used to investigate the effect of genetic variation in the Major Histocompatibility Complex (MHC) class II region on resistance of sheep to the intestinal parasite Trichostrongylus colubriformis, using faecal egg count (fec) as the measure of resistance. RFLP analysis of DNA from 335 sheep with the restriction enzymes TaqI, PvuII and HindIII, and DRB, DQA and DQB human class II MHC cDNA clones, revealed 238 bands, of which 233 were polymorphic. Sixteen bands were associated with a significant effect on fec, when analysed using a mixed model, best linear unbiased prediction statistical methods. However, when p values were corrected for the number of bands tested the associations were no longer significant. While no individual band had a significant effect on fec, Fisher's X(2) test of the distribution of p-values showed that RFLP bands, when considered together, do account for a significant proportion of variation in fec. One hundred and thirteen offspring from 11 halb-sib families were classified according to which MHC haplotype they had inherited from their sire. While there was overall no convincing statistical evidence of an effect of MHC haplotype on resistance, results in one family showed evidence for a repeatable MHC effect. ZUSAMMENFASSUNG: Die MHC-Klasse II Region und Resistenz gegenüber Darmparasiten beim Schaf RFLP Analyse betrifft die Auswirkung genetischer Unterschiede im Haupthistokompatibilitäts-Komplex (MHC) Klasse II Region auf Resistenz von Schafen gegen den Darmparasiten Trichostrongylus colubriformis, wobei die fäkale Eizahl (fec) als Maß der Resistenz verwendet worden ist. Die RFLP-Analyse der DNA von 335 Schafen mit Restriktionsenzymen TaqI, PvuII und HndIII und DRB, DQA und DQB menschlicher Klasse II MHC cDNA Klone ergab 238 Bande, wovon 233 polymorph waren. 16 Bande waren mit einer signifikanten Wirkung auf fec verbunden, wobei zur Analyse das gemischte Modell der BLUP verwendet worden ist. Allerdings, nach Korrektur der p-Werte für die Zahl der geprüften Bande zeigt sich die Assoziation nicht länger als signifikant. Während kein individuelles Band eine signifikante Wirkung auf FEC zeigte, ergab Fisher's test hinsichtlich Verteilung der p-Werte Signifikanz bei Gesamtbetrachtung. 113 Nachkommen von 11 Halbgeschwister-Familien wurden nach dem MHC Haplotyp des Vatertieres klassifiziert. Es ergab sich kein insgesamt überzeugender statistischer Hinweis auf Wirkung der MHC Haplotypen, doch in einer Familie Hinweis auf wiederholbare MHC Effekte.

摘要

RFLP 分析用于研究主要组织相容性复合体(MHC)Ⅱ类区域遗传变异对绵羊抗肠道寄生虫旋毛虫抗性的影响,以粪便卵计数(fec)作为抗性的衡量标准。使用 TaqI、PvuII 和 HindIII 限制酶和 DRB、DQA 和 DQB 人类Ⅱ类 MHC cDNA 克隆对 335 只绵羊的 DNA 进行 RFLP 分析,共检测到 238 个带,其中 233 个为多态性。当使用混合模型、最佳线性无偏预测统计方法进行分析时,16 个带与 fec 有显著关联。然而,当校正所测试的带数的 p 值时,关联不再显著。虽然没有单个带对 fec 有显著影响,但 Fisher's X(2)检验表明,当考虑到 RFLP 带时,它们确实可以解释 fec 变化的很大一部分。从 11 个半同胞家系的 113 只后代中,根据它们从父亲那里继承的 MHC 单倍型进行分类。虽然没有令人信服的统计证据表明 MHC 单倍型对抗性有影响,但在一个家系中,结果表明 MHC 效应具有可重复性。

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