目的通过分析罗氏Cobas s 201的血液核酸检测(NAT)结果评估其对HBV的检测效果。方法将检测结果根据酶联免疫吸附试验(ELISA)和NAT混合检测(MP)、NAT单样本检测(ID)以及重复NAT单样本检测(rID)分组,分为ELISA+/NAT(ID)+、ELISA+/NAT(rID)...目的通过分析罗氏Cobas s 201的血液核酸检测(NAT)结果评估其对HBV的检测效果。方法将检测结果根据酶联免疫吸附试验(ELISA)和NAT混合检测(MP)、NAT单样本检测(ID)以及重复NAT单样本检测(rID)分组,分为ELISA+/NAT(ID)+、ELISA+/NAT(rID)+、ELISA-/NAT(ID)+、ELISA-/NAT(rID)+4组进行统计分析,探讨重复NAT对反应性结果的检出是否存在差异,对于不同ELISA结果的NAT反应性标本的循环阈值(cycle threshold,Ct)与核酸检出率的关联性。再通过补充试验,包括其他方法学的NAT系统和化学发光血清学标志物检测,进一步分析献血者的真实感染情况。结果766293份献血者标本中共有1691组HBV NAT(MP)+,其中1418组(83.86%)检出反应性结果(1418份HBV NAT+,7090份NAT-),仍有273组(16.14%)经重复检测仍未检出[共计1638份NAT-,Ct(MP):39.49±3.62]。HBV NAT+中,881份(62.13%)ELISA+/NAT(ID)+,19份(1.34%)ELISA+/NAT(rID)+,451份(31.81%)ELISA-/NAT(ID)+,67份(4.72%)ELISA-/NAT(rID)+。对于不同ELISA结果的标本,重复NAT对HBV的检出存在差异(P<0.05)。各组间Ct(ID)值仅ELISA+/NAT(rID)+和ELISA-/NAT(ID)+、ELISA+/NAT(rID)+和ELISA-/NAT(rID)+2组比较无差异(P>0.05),其余各组间两两比较,均有差异(P<0.05)。对228份ELISA-/NAT(MP)+(ID)-进行补充试验,有56份(24.56%)经化学发光检测HBsAg+和7份(3.07%)经其他NAT系统检出反应性。剩余221份(96.93%)NAT-标本中,53份(23.98%)HBsAg+的献血者可能存在慢性感染,40份(18.10%)抗-HBe+和(或)抗-HBc+的献血者可能存在既往感染,其余128份(57.92%)均无反应性的献血者为NAT(MP)假反应性,且各组间抗-HBs含量差异较大(P<0.05)。结论重复NAT对不同反应性类别或不同血清学结果的献血者标本存在差异性检出,尤其在一定区间范围内,对于ELISA-标本进行重复NAT可明显提高检出率。Ct值可辅助评估NAT系统的稳定性和准确性。对于ELISA-/NAT(MP)+(ID)-献血者,结合其他高灵敏度的检测手段可降低病毒残余风险,保障临床用血安全。展开更多
The pedigrees of three sequenced rice cultivars were analyzed to show that a majority of the genetic composition of 'Nipponbare' originates from japonica cultivars while the minority originates from indica cul...The pedigrees of three sequenced rice cultivars were analyzed to show that a majority of the genetic composition of 'Nipponbare' originates from japonica cultivars while the minority originates from indica cultivars. In contrast, '93-11' is derived mainly from indica cultivars with a smaller contribution from japonica cultivars. All ancestors of 'Guang lu ai 4' appeared to be indica lines. A set of molecular markers (46 InDels and 53 SSRs) polymorphic between 'Nipponbare' and '93-11' were examined in 46 typical indica and 47 typical japonica cultivars selected from 443 accessions according to Cheng's index. All cultivars were divided into indica and japonica groups without overlapping when clustered by Cheng's index, InDels and SSRs. Much higher InDel and SSR diversity between groups than within groups implies that the marker polymorphisms between 'Nipponbare' and '93-11' represent a large proportion of inter-subspecific diversity. About 85% of indica cultivars and more than 90% of japonica cultivars were confirmed to have the same PCR banding patterns as '93-11' and 'Nipponbare', respectively. Some polymorphic loci between 'Nipponbare' and '93-11' cannot be validated in other indica and japonica cultivars, either as subspecies-specific but not predominant alleles, or alleles not specific between the two groups. It was concluded that molecular markers developed from sequence polymorphism between 'Nipponbare' and '93-11' often represent inter-subspecific diversity, although some exceptions were sensitive to either particular marker loci or particular cultivars.展开更多
基金Supported by Shanghai Municipal Science and Technology Commission (Grant Nos. 03DJ14014 and 05DJ14008)Chinese Ministry of Agriculture (948 plan) (Grant Nos. 2001-101 and 2006-G-1)Chinese Ministry of Science and Technology (Grant No. 2004CB117204)
文摘The pedigrees of three sequenced rice cultivars were analyzed to show that a majority of the genetic composition of 'Nipponbare' originates from japonica cultivars while the minority originates from indica cultivars. In contrast, '93-11' is derived mainly from indica cultivars with a smaller contribution from japonica cultivars. All ancestors of 'Guang lu ai 4' appeared to be indica lines. A set of molecular markers (46 InDels and 53 SSRs) polymorphic between 'Nipponbare' and '93-11' were examined in 46 typical indica and 47 typical japonica cultivars selected from 443 accessions according to Cheng's index. All cultivars were divided into indica and japonica groups without overlapping when clustered by Cheng's index, InDels and SSRs. Much higher InDel and SSR diversity between groups than within groups implies that the marker polymorphisms between 'Nipponbare' and '93-11' represent a large proportion of inter-subspecific diversity. About 85% of indica cultivars and more than 90% of japonica cultivars were confirmed to have the same PCR banding patterns as '93-11' and 'Nipponbare', respectively. Some polymorphic loci between 'Nipponbare' and '93-11' cannot be validated in other indica and japonica cultivars, either as subspecies-specific but not predominant alleles, or alleles not specific between the two groups. It was concluded that molecular markers developed from sequence polymorphism between 'Nipponbare' and '93-11' often represent inter-subspecific diversity, although some exceptions were sensitive to either particular marker loci or particular cultivars.