CN117778595A - 与绵羊产羔数性状相关的snp分子标记及其应用 - Google Patents
与绵羊产羔数性状相关的snp分子标记及其应用 Download PDFInfo
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Abstract
本发明公开了与绵羊产羔数性状相关的SNP分子标记及其应用,属于基因工程领域,SNP有两个,分别位于绵羊参考基因组Oar_v4.0的X染色体第60387291位点和第60388727位点,第60387291位点具有G/C多态性,第60388727位点具有G/A多态性。当X染色体第60387291位点基因型为GG或GC时,产羔数显著高于CC;当X染色体第60388727位点基因型为GG或GA时,产羔数显著高于AA;本发明利用重测序方法,结合绵羊产羔数性状,寻找到了与绵羊产羔数性状相关的FOXO4基因SNP标记,为绵羊产羔数性状的标记辅助选择提供新的标记资源。
Description
技术领域
本发明属于基因工程领域,具体涉及与绵羊产羔数性状相关的SNP分子标记及其应用。
背景技术
绵羊是相对多产的小型反刍动物,也是动物蛋白的重要来源(Goldansaz, SeyedAli et al. “Predictive blood biomarkers of sheep pregnancy and litter size.”Scientific reports vol. 12,1 10307. 20 Jun. 2022.)。产羔数性状是绵羊最重要的繁殖性状之一,具有巨大的经济效益。由于绵羊窝产羔数遗传力低,传统育种方法难以快速提高窝产羔数。因此,探索影响绵羊产羔数的候选基因及其各种遗传变异,并将这些变异用于绵羊的分子标记辅助选择(marker-assisted selection, MAS)育种,以增加窝产羔数同时提高规模化养殖的生产效率,是目前常用的研究手段(Abd El-Hack, Mohamed E et al.“The application of gene marker-assisted selection and proteomics for thebest meat quality criteria and body measurements in Qinchuan cattle breed.”Molecular biology reports vol. 45,5 (2018): 1445-1456)。
FOXO4(Forkhead box O4)基因是FOXO家族成员之一,在细胞代谢、细胞凋亡和细胞稳态调节等生物学过程中发挥着重要作用(Liu, Wen et al. “Current perspectiveon the regulation of FOXO4 and its role in disease progression.” Cellular and molecular life sciences : CMLS vol. 77,4 (2020): 651-663.)。研究表明,FOXO4在卵泡发育各个阶段在颗粒细胞中表达,并被认为在卵母细胞成熟、排卵和黄体化中发挥重要作用(Ting et al. “Characterization of FOXO1, 3 and 4 transcription factors inovaries of fetal, prepubertal and adult rhesus macaques.” Biology ofreproduction vol. 96,5 (2017): 1052-1059)。然而,在禁食条件下,FOXO4表达量逐步升高,过表达的FOXO4可下调mTORC1信号并抑制STAT1/3的激活,进而抑制辅助T细胞反应性,造成机体免疫功能的缺陷(Mandal, Raju et al. “FOXO4 interacts with p53 TAD andCRD and inhibits its binding to DNA.” Protein science : a publication of the Protein Society vol. 31,5 (2022): e4287)。机体免疫功能缺陷,可能会导致疾病发生与发展,最终产生一系列不良事件,例如流产等。研究结果表明,FOXO4基因在绵羊妊娠不同阶段,可以通过不同调节方式参与相关生理过程,但具体机制并未完全明确。
目前,FOXO4基因对于绵羊产羔数性状调控及其分子生物学调控机制并未报道。
发明内容
本发明所要解决的技术问题为:提供绵羊产羔数性状相关SNP分子标记及其应用。
本发明的技术方案为:一种辅助预测绵羊产羔数的方法,根据绵羊X染色体第60387291位点或/和第60388727位点的基因型进行判断:
当X染色体第60387291位点基因型为GG或GC时,产羔数显著高于CC;
当X染色体第60388727位点基因型为GG或GA时,产羔数显著高于AA;
参考基因组版本为Oar_v4.0。
检测SNP位点基因型的试剂在绵羊产羔数性状鉴定或辅助育种中的应用,所述SNP位点有两个,分别位于绵羊参考基因组Oar_v4.0 的X染色体第60387291位点和第60388727位点,第60387291位点具有G/C多态性,第60388727位点具有G/A多态性。
进一步地,所述试剂为两对引物组合,其中一对引物的核苷酸序列如SEQ ID No.3和SEQ ID No.4所示,另一对引物的核苷酸序列如SEQ ID No.5和SEQ ID No.6所示。
一种试剂盒,含有上述所述的两队引物组合。
绵羊产羔数性状SNP分子标记组合,所述SNP分子标记组合有两个,核苷酸序列分别如SEQ ID No.1和SEQ ID No.2所示,其中,SEQ ID No.1所示核苷酸序列的第355位具有G/C多态性,SEQ ID No.2所示核苷酸序列的第274位具有G/A多态性。
与现有技术相比,本发明具有以下有益效果:
本发明利用重测序方法,结合绵羊产羔数性状,寻找到了与绵羊产羔数性状相关的FOXO4基因SNP标记,为绵羊产羔数性状的标记辅助选择提供新的标记资源。
附图说明
图1 中国地方绵羊品种选择信号定位分析;
图2 FOXO4基因分型结果图;
图3 FOXO4基因SNP位点不同基因型对应产羔数性状,A和图B分别为两个SNP位点对应的GEBV值和产羔数结果;
图4 包含FOXO4基因SNP位点的结果图,A分别为FOXO4基因中包含SNP位点的PCR产物核酸电泳结果图,B为sanger测序结果图,红框所示处为SNP位点。
具体实施方式
下述实施例中的实验方法,如无特殊说明,均为常规方法。下述实施例中所用的试验材料,如无特殊说明,均为从商业渠道购买得到的。
实施例1 产羔数SNP分子标记的挖掘
前期通过对23个绵羊品种共计508只个体进行了10x重测序,针对繁殖能力将绵羊品种分为两组,通过全基因组选择信号的方法,发现高繁殖力组绵羊除了在其他染色体存在信号外,在27号染色体上也受到强烈选择,该区段包括了FOXO4基因(图1)。针对该区段内SNP位点,利用大群再次分型验证。
利用200只湖羊和200只呼伦贝尔羊全血DNA样本针对重测序获得的SNP位点进行基因分型,并结合相应个体的产羔数性状进行关联分析,发现绵羊FOXO4基因的2个SNP位点与绵羊产羔数显著相关(图2,图3,表1),两个SNP位点均位于绵羊X染色体(NC_019484.2,参考基因组版本:Oar_v 4.0)。
我们首先利用产羔数存在显著差别的两个群体湖羊(产羔数高)和呼伦贝尔羊(产羔数低)群体进行分型验证,如表1所示,对于Chr X_60387291 G>C位点,湖羊GG基因型频率为0.64,均高于湖羊GC基因型频率(0.30)和CC基因型频率(0.06),而呼伦贝尔羊的GG基因型频率(0.12)则低于GC基因型频率(0.33)和CC基因型频率(0.55)。卡方检验结果表明,两种绵羊基因型频率呈现显著相反变化(p<0.01)。同样,对于Chr X_60388727 G>A位点,湖羊和呼伦贝尔羊基因型变化也存在相似现象,湖羊GG基因型频率(0.63)高于GA基因型频率(0.31)和AA基因型频率(0.06),而呼伦贝尔羊的GG基因型频率(0.13)则低于GA基因型频率(0.32)和AA基因型频率(0.54),卡方检验结果显示两个品种绵羊基因型频率存在显著差异( p<0.01 )。
表1 绵羊FOXO4基因的基因型频率和等位基因频率
其次,利用前期收集的湖羊群体中多个个体的产羔数记录进行SNP位点与产羔数性状的关联分析,其中一个SNP位于X染色体第60387291的位置,此位点具有G/C多态性,当该位点基因型为GG或GC时,产羔数显著高于CC。另一个SNP位于X染色体第60388727的位置,此位点具有G/A多态性,当该位点基因型为GG或GA时,产羔数显著高于AA。且两个SNP位点是连锁的,当第60387291位由GG突变成GC时,第60388727位也会由GG突变成GA;当第60387291位由GG突变成CC时,第60388727位也会由GG突变成AA。因此根据其中一个SNP位点的基因型或结合两个SNP位点的基因型均可判断产羔数的高低。
表2 200只湖羊的基因型和GEBV数据
样本编号 | LS(产羔数)GEBV | LA(产活羔数)GEBV | X_60387291 | X_60388727 |
HY3200080 | -0.1069506 | -0.11858973 | G | G |
HY3200082 | -0.12567467 | -0.11669102 | GC | GA |
HY3200086 | -0.06509748 | -0.01363025 | G | G |
HY3200090 | 0.39598156 | 0.44038838 | GC | GA |
HY3200098 | -0.06156299 | -0.02327923 | GC | GA |
HY3200100 | -0.41602199 | -0.36905344 | C | A |
HY3200122 | -0.08272359 | -0.01113913 | G | G |
HY3200124 | -0.28014799 | -0.2305908 | GC | GA |
HY3200128 | 0.41927436 | 0.26465279 | G | G |
HY3200130 | 0.28220694 | 0.2616104 | G | G |
HY3200132 | -0.32724332 | -0.2656765 | GC | GA |
HY3200134 | 0.30609505 | 0.33922767 | GC | GA |
HY3200146 | 0.5009378 | 0.52473401 | GC | GA |
HY3200150 | -0.04404611 | -0.14829535 | GC | GA |
HY3200154 | -0.07722645 | -0.04355139 | G | G |
HY3200156 | -0.1084163 | -0.09815375 | G | G |
HY3200160 | -0.37156861 | -0.31246786 | G | G |
HY3200164 | 0.05527866 | 0.11479065 | G | G |
HY3200168 | 0.41775018 | 0.43148215 | G | G |
HY3200170 | 0.24022926 | 0.26311739 | G | G |
HY3200172 | 0.16191147 | 0.04373154 | G | G |
HY3200174 | 0.04289762 | 0.08406176 | G | G |
HY3200180 | -0.1815955 | -0.2234421 | G | G |
HY3200182 | -0.14529081 | -0.11301186 | G | G |
HY3200184 | -0.22261379 | -0.17610262 | G | G |
HY3200190 | -0.01460945 | 0.03328773 | G | G |
HY3200194 | 0.39757694 | 0.42599389 | G | G |
HY3200196 | -0.20344193 | -0.16841279 | G | G |
HY3200208 | 0.09422272 | 0.14576567 | G | G |
HY3200212 | -0.08404773 | -0.04707368 | C | A |
HY3200214 | -0.02460939 | 0.00555301 | GC | GA |
HY3200218 | -0.02271576 | 0.01066999 | GC | GA |
HY3200222 | -0.25589824 | -0.07213945 | GC | GA |
HY3200232 | -0.04833786 | 0.02495408 | G | G |
HY3200258 | 0.07091485 | 0.13112683 | G | G |
HY3200264 | -0.15203465 | -0.13508362 | GC | GA |
HY3200270 | 0.12115251 | 0.15029448 | C | A |
HY3200274 | 0.262737 | 0.22810163 | G | G |
HY3200276 | 0.14495041 | 0.18441712 | G | G |
HY3200280 | -0.03218648 | -0.00800727 | G | G |
HY3200282 | 0.21007846 | 0.183941 | GC | GA |
HY3200288 | -0.24463475 | -0.18485438 | G | G |
HY3200290 | -0.29433532 | -0.22074679 | C | A |
HY3200292 | -0.20420613 | -0.13276676 | C | A |
HY3200296 | -0.04053021 | -0.03443958 | G | G |
HY3200298 | 0.16496193 | 0.11145472 | G | G |
HY3200300 | 0.11162433 | 0.14399504 | G | G |
HY3200316 | 0.15640435 | -0.01532218 | GC | GA |
HY3200320 | -0.23403228 | -0.22514842 | G | G |
HY3200328 | 0.111111 | 0.09703873 | GC | GA |
HY3200332 | 0.05634868 | 0.09286837 | GC | GA |
HY3200340 | 0.12179924 | 0.16242309 | G | G |
HY3200342 | -0.25404244 | -0.21084424 | C | A |
HY3200344 | -0.10012455 | -0.08245806 | G | G |
HY3200352 | 0.01157787 | -0.2264748 | G | G |
HY3200356 | -0.49182312 | -0.44857372 | G | G |
HY3200358 | -0.4597632 | -0.40673562 | G | G |
HY3200362 | 0.4138204 | 0.32077471 | G | G |
HY3200364 | 0.44181203 | 0.30038175 | G | G |
HY3200366 | 0.06143335 | 0.08352554 | G | G |
HY3200368 | -0.1767449 | -0.2327257 | GC | GA |
HY3200370 | -0.34761926 | -0.40137145 | GC | GA |
HY3200374 | -0.0193319 | -0.03081193 | G | G |
HY3200378 | -0.3122836 | -0.2675826 | G | G |
HY3200380 | -0.5883627 | -0.53061869 | GC | GA |
HY3200382 | 0.09019896 | 0.12518766 | G | G |
HY3200384 | -0.16732932 | -0.1190001 | G | G |
HY3200386 | 0.11348666 | 0.13701593 | G | G |
HY3200388 | -0.18516835 | -0.1454131 | G | G |
HY3200390 | -0.33198769 | -0.30338365 | G | G |
HY3200394 | 0.02277578 | 0.03055144 | G | G |
HY3200404 | -0.19972701 | -0.1663796 | GC | GA |
HY3200408 | 0.24297792 | 0.25652275 | G | G |
HY3200410 | -0.47370217 | -0.42825015 | GC | GA |
HY3200416 | -0.43054688 | -0.37865892 | G | G |
HY3200420 | -0.011019 | 0.02116706 | G | G |
HY3200422 | -0.39054679 | -0.35280503 | GC | GA |
HY3200424 | -0.1815344 | -0.21989166 | C | A |
HY3200428 | -0.24665257 | -0.19339748 | G | G |
HY3200430 | -0.16512732 | -0.14852122 | G | G |
HY3200438 | -0.26751191 | -0.24078204 | GC | GA |
HY3200440 | -0.02798406 | -0.01624159 | G | G |
HY3200442 | -0.05307959 | -0.07483563 | GC | GA |
HY3200444 | -0.07853676 | -0.05868525 | G | G |
HY3200446 | 0.03514342 | 0.0528577 | G | G |
HY3200448 | -0.58116567 | -0.57320655 | G | G |
HY3200454 | -0.16425894 | -0.25363744 | G | G |
HY3200456 | -0.56963198 | -0.51761458 | G | G |
HY3200458 | -0.31698077 | -0.26479864 | GC | GA |
HY3200460 | -0.42486987 | -0.35748296 | GC | GA |
HY3200464 | 0.15247523 | 0.1579343 | G | G |
HY3200472 | 0.17041045 | 0.05947061 | G | G |
HY3200476 | 0.27456273 | 0.10262351 | G | G |
HY3200480 | 0.16007788 | 0.19247087 | GC | GA |
HY3200482 | -0.00510464 | 0.03346583 | G | GA |
HY3200484 | -0.23605783 | -0.23786842 | G | G |
HY3200486 | 0.25746948 | 0.27047752 | G | G |
HY3200490 | 0.34374756 | 0.33009772 | G | G |
HY3200492 | -0.35073232 | -0.32685736 | G | G |
HY3200494 | -0.19416773 | -0.18213868 | GC | GA |
HY3200498 | -0.10580463 | -0.07122091 | G | G |
HY3200502 | -0.19421072 | -0.17109424 | GC | GA |
HY3200504 | -0.31433181 | -0.39055557 | C | A |
HY3200506 | 0.23279808 | 0.24152841 | C | A |
HY3200510 | -0.40113263 | -0.38403886 | G | G |
HY3200512 | -0.31350605 | -0.3175681 | G | G |
HY3200516 | 0.17603741 | 0.20504234 | GC | GA |
HY3200520 | 0.24169972 | 0.06083459 | GC | GA |
HY3200528 | 0.24233984 | 0.32248672 | G | G |
HY3200536 | 0.20906399 | 0.19315286 | G | G |
HY3200542 | 0.0424043 | 0.02342533 | G | G |
HY3200550 | 0.37316173 | 0.29823488 | GC | GA |
HY3200552 | 0.19395469 | 0.20671326 | GC | GA |
HY3200560 | 0.23554044 | 0.15412089 | G | G |
HY3200562 | 0.18230338 | 0.09639609 | G | G |
HY3200568 | -0.14859005 | -0.15568273 | G | G |
HY3200574 | 0.01173127 | 0.03086759 | G | G |
HY3200576 | -0.00906912 | -0.0011977 | G | G |
HY3200580 | -0.23694371 | -0.21613616 | GC | GA |
HY3200584 | 0.18620657 | 0.08348582 | C | A |
HY3200588 | 0.26846569 | 0.32765323 | G | G |
HY3200596 | -0.26085551 | -0.20318807 | G | G |
HY3200598 | -0.09392115 | -0.04531874 | GC | GA |
HY3200602 | -0.14678979 | -0.10743268 | GC | GA |
HY3200604 | -0.0136451 | 0.06194221 | G | G |
HY3200620 | 0.07795985 | 0.09681492 | GC | GA |
HY3200622 | 0.29123041 | 0.27232735 | GC | GA |
HY3200626 | 0.32183513 | 0.34218025 | G | G |
HY3200634 | 0.16574094 | 0.06292791 | G | G |
HY3200636 | 0.14540149 | 0.05104993 | G | G |
HY3200638 | -0.10292257 | -0.08959262 | G | G |
HY3200642 | 0.18600288 | 0.00577694 | G | G |
HY3200650 | -0.01275404 | -0.01401712 | G | G |
HY3200652 | -0.01321871 | -0.01446818 | G | G |
HY3200658 | -0.22320839 | -0.23368196 | GC | GA |
HY3200660 | -0.16476849 | -0.18607131 | GC | GA |
HY3200662 | -0.37434851 | -0.34083125 | GC | GA |
HY3200666 | 0.3612711 | 0.39554706 | G | G |
HY3200668 | 0.53510115 | 0.43048428 | G | G |
HY3200672 | -0.08668192 | -0.06329203 | C | A |
HY3200674 | 0.11955632 | 0.14805082 | G | G |
HY3200676 | -0.18297441 | -0.15870357 | G | G |
HY3200684 | 0.38641018 | 0.31557926 | GC | GA |
HY3200690 | -0.18571805 | -0.16094309 | G | G |
HY3200694 | 0.49225991 | 0.52179537 | G | G |
HY3200696 | 0.20231041 | 0.20609037 | G | G |
HY3200698 | -0.39550269 | -0.32686341 | G | G |
HY3200704 | -0.13091723 | -0.06867106 | GC | GA |
HY3200706 | -0.35822852 | -0.33957502 | C | A |
HY3200708 | 0.03745789 | -0.02279116 | GC | GA |
HY3200718 | -0.0715698 | -0.05924824 | GC | GA |
HY3200724 | -0.2252657 | -0.17933459 | GC | GA |
HY3200726 | 0.09856739 | -0.00122737 | G | G |
HY3200728 | 0.14400842 | 0.0642588 | G | G |
HY3200732 | -0.20149687 | -0.18084992 | GC | GA |
HY3200736 | 0.03237174 | -0.03176897 | G | G |
HY3200744 | 0.126011 | 0.15292918 | GC | GA |
HY3200746 | 0.02174527 | 0.05379518 | G | G |
HY3200748 | 0.2218005 | 0.23558738 | G | G |
HY3200754 | -0.39205942 | -0.37259563 | G | G |
HY3200758 | -0.17490657 | -0.15182493 | G | G |
HY3200760 | -0.16128847 | -0.12188625 | C | A |
HY3200762 | 0.00541539 | 0.03509441 | G | G |
HY3200766 | -0.07055339 | -0.01479696 | GC | GA |
HY3200774 | 0.1523557 | 0.18311073 | G | G |
HY3200776 | 0.45910691 | 0.45937087 | GC | GA |
HY3200778 | 0.18488515 | 0.18272815 | G | G |
HY3200782 | -0.22688659 | -0.1976301 | GC | GA |
HY3200786 | -0.1451446 | -0.11226748 | GC | GA |
HY3200790 | -0.10352645 | -0.05107446 | G | G |
HY3200796 | -0.12531763 | -0.08339918 | G | G |
HY3200800 | 0.13863815 | 0.16643866 | G | G |
HY3200802 | -0.0576306 | -0.03711895 | G | G |
HY3200804 | 0.14721702 | 0.1643438 | GC | GA |
HY3200806 | 0.20138861 | 0.23302363 | G | G |
HY3200812 | -0.01069226 | 0.0312826 | G | G |
HY3200816 | 0.20524246 | 0.23201352 | G | G |
HY3200822 | -0.15125405 | -0.11369953 | GC | GA |
HY3200826 | 0.03771562 | 0.00503947 | GC | GA |
HY3200830 | -0.28178976 | -0.25157967 | C | A |
HY3200832 | -0.35392488 | -0.31194065 | G | G |
HY3200834 | 0.45097241 | 0.47591679 | GC | GA |
HY3200836 | 0.2621843 | 0.28325486 | GC | |
HY3200840 | 0.21902817 | 0.19133332 | G | G |
HY3200842 | 0.45891917 | 0.47530916 | G | G |
HY3200862 | 0.11152747 | 0.16438781 | G | G |
HY3200868 | 0.10701189 | 0.12055701 | G | G |
HY3200876 | 0.32548753 | 0.35321069 | G | G |
HY3200882 | 0.26356796 | 0.27471424 | GC | GA |
HY3200884 | 0.15958655 | 0.17746053 | C | A |
HY3200894 | 0.29885333 | 0.31056157 | GC | GA |
HY3200908 | 0.06852593 | 0.11603212 | G | G |
HY3200910 | 0.27981456 | 0.32029846 | GC | GA |
HY3200914 | 0.08470921 | 0.12370889 | GC | GA |
HY3200924 | 0.18299016 | 0.23687884 | GC | GA |
HY3200928 | -0.00269753 | 0.04290573 | G | G |
HY3200934 | 0.00000739 | -0.01093414 | G | G |
HY3200936 | -0.18136534 | -0.19755944 | C | A |
HY3200938 | -0.13346108 | -0.10537459 | G | G |
HY3200942 | 0.13701704 | 0.14769546 | G | G |
表3 不同基因型与湖羊产羔数关联分析
实施例2 SNP位点基因型的检测
1.根据两个SNP位点上下游序列信息(第一个SNP定位于SEQ ID No.1所示核苷酸序列的第355位,第二个SNP定位于SEQ ID No.2所示核苷酸序列的第274位),设计扩增SNP分子标记的特异性引物,引物序列如下所示:
上游引物F1:5’-TCTGCAAATCCTGTAGAGTGCCAG-3’
下游引物R1:5’-ACCAGGAGCTCTTGCCAGTA-3’
上游引物F2:5’-CTCCTACTGAAGCTCCAAGCCA-3’
下游引物R2:5’-CACGCCTGGTTCTGTCTCTGAA-3’
2.利用以上引物序列对SNP分子标记进行扩增,具体步骤为:
(1)采集湖羊抗凝血液,利用天根全血/细胞/组织基因组DNA提取试剂盒提取DNA样品,采用擎科T5 DNA Polymeras和上述引物对进行PCR扩增反应扩增目的序列。
反应体系为:25μL总反应体系,DNA总量为1μg,引物终浓度为0.5μM。
PCR扩增程序为:98℃、3min,34×[98℃、10s,61℃、10s,72℃、30s],72℃、5min,4℃保存。引物对F1/R1扩增序列长度为674bp,引物对F2/R2扩增序列长度为527bp。
(2)将步骤(1)中最终所获得的PCR扩增产物通过琼脂糖凝胶电泳检测,选择目的条带清晰的样品通过Sanger测序得到包含绵羊FOXO4基因SNP位点的序列信息(图4)。
Claims (5)
1.一种辅助预测绵羊产羔数的方法,其特征在于,根据绵羊X染色体第60387291位点或/和第60388727位点的基因型进行判断:
当X染色体第60387291位点基因型为GG或GC时,产羔数显著高于CC;
当X染色体第60388727位点基因型为GG或GA时,产羔数显著高于AA;
参考基因组版本为Oar_v4.0。
2. 检测SNP位点基因型的试剂在绵羊产羔数性状预测或辅助育种中的应用,所述SNP位点有两个,分别位于绵羊参考基因组Oar_v4.0 的X染色体第60387291位点和第60388727位点,第60387291位点具有G/C多态性,第60388727位点具有G/A多态性。
3. 根据权利要求2所述的应用,其特征在于,所述试剂为两对引物组合,其中一对引物的核苷酸序列如SEQ ID No.3和SEQ ID No.4所示,另一对引物的核苷酸序列如SEQ IDNo.5和SEQ ID No.6所示。
4.一种试剂盒,含有权利要求3所述的两对引物组合。
5. 绵羊产羔数性状SNP分子标记组合,其特征在于,所述SNP分子标记组合有两个,核苷酸序列分别如SEQ ID No.1和SEQ ID No.2所示,其中,SEQ ID No.1所示核苷酸序列的第355位具有G/C多态性,SEQ ID No.2所示核苷酸序列的第274位具有G/A多态性。
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