共查询到20条相似文献,搜索用时 15 毫秒
1.
Buitkamp J Kollers S Durstewitz G Welzel K Schäfer K Kellermann A Lehrach H Fries R 《Animal genetics》2000,31(6):347-351
A bovine genomic large-insert bacterial artificial chromosome (BAC) library has been constructed from leukocytes of a Holstein-Friesian male. Size fractionated DpnII-digested genomic DNA was ligated to the dephosphorylated BamH1 ends of a pBACe3.6 vector. Approximately 8.3 x 10(4) individual BAC clones were picked into 384-well plates. Two-hundred and sixty-seven randomly chosen clones were characterized by pulsed-field gel electrophoresis (PFGE). The average insert size was 104 kb with a frequency of clones without inserts of 5.5%. Thirty-four BAC clones were mapped by fluorescence in situ hybridization (FISH) to cattle chromosomes. Three showed signals at more than one location, one of them on the centromeric regions of all autosomes, indicating that the clone contains centromeric repeats. A subset of these BAC clones was used for the development of sequence tagged sites. Both subcloning and direct sequencing of the BACs were used for generating sequence tagged site information. The clones from the library were gridded onto high-density membranes, and PCR superpools were produced from the same set of clones. Membranes and superpools are available through the Resource Centre of the German Human Genome Project in Berlin (http:// www.rzpd.de). 相似文献
2.
Hong YS Hogan JR Wang X Sarkar A Sim C Loftus BJ Ren C Huff ER Carlile JL Black K Zhang HB Gardner MJ Collins FH 《Molecular genetics and genomics : MGG》2003,268(6):720-728
A Bacterial Artificial Chromosome (BAC) genomic DNA library of Anopheles gambiae, the major human malaria vector in sub-Saharan Africa, was constructed and characterized. This library (ND-TAM) is composed of 30,720 BAC clones in eighty 384-well plates. The estimated average insert size of the library is 133 kb, with an overall genome coverage of approximately 14-fold. The ends of approximately two-thirds of the clones in the library were sequenced, yielding 32,340 pair-mate ends. A statistical analysis (G-test) of the results of PCR screening of the library indicated a random distribution of BACs in the genome, although one gap encompassing the white locus on the X-chromosome was identified. Furthermore, combined with another previously constructed BAC library (ND-1), ~2,000 BACs have been physically mapped by polytene chromosomal in situ hybridization. These BAC end pair mates and physically mapped BACs have been useful for both the assembly of a fully sequenced A. gambiae genome and for linking the assembled sequence to the three polytene chromosomes. This ND-TAM library is now publicly available at both http://www.malaria.mr4.org/mr4pages/index.html/ and http://hbz.tamu.edu/, providing a valuable resource to the mosquito research community. 相似文献
3.
Construction and characterization of a bacterial artificial chromosome (BAC) library for the A genome of wheat. 总被引:24,自引:0,他引:24
A genomic bacterial artificial chromosome (BAC) library of the A genome of wheat has been constructed. Triticum monococcum accession DV92 was selected for this purpose because it is a cultivated diploid wheat and one of the parental lines used in the construction of a saturated genetic map. Leaves from this accession were used to isolate high-molecular-weight DNA from nuclei. This DNA was partially digested with restriction enzyme Hind III, subjected to double size selection, electroeluted and cloned into the pINDIGO451 BAC vector. The library consists of 276,480 clones with an average insert size of 115 kb. Excluding the 1.33% of empty clones and 0.14% of clones with chloroplast DNA, the coverage of this library is 5.6 genome equivalents. With this genome coverage the probability of having any DNA sequence represented in this library is higher than 99.6%. Clones were sorted in 720,384-well plates and blotted onto 15 high-density filters. High-density filters were screened with several single or low-copy clones and five positive BAC clones were selected for further analysis. Since most of the T. monococcum BAC ends included repetitive sequences, a modification was introduced into the classical end-isolation procedure to select low copy sequences for chromosome walking. 相似文献
4.
Katagiri T Asakawa S Hirono I Aoki T Shimizu N 《Marine biotechnology (New York, N.Y.)》2000,2(6):571-576
We have constructed a genomic bacterial artificial chromosome (BAC) library from homozygous cloned Japanese flounder Paralichthys olivaceus using the pBAC-lac vector. This BAC library consists of about 49,100 clones and is deposited in 128 microtiter plates with 384 wells. The average
size of inserted DNA was calculated to be 165 kb. The BAC library was determined to cover 9 times the Japanese flounder haploid
genome. The Japanese flounder genomic BAC library will be useful for gene isolation as well as quantitative trait loci (QTL)
analysis.
Received March 1, 2000; accepted May 29, 2000. 相似文献
5.
Chinese pangolins as a representative species in the order Pholidota have highly specified morphological characters and occupy an important place in the mammalian phylogenetic tree. To obtain genomic data for this species, we have constructed a bacterial artificial chromosome (BAC) library of Chinese pangolin. The library contains 208,272 clones with an average insert size of 122.1 kb and represents approximately eight times the Chinese pangolin haploid genome (if we assume that the Chinese pangolins have a genome size similar to human). One hundred and twenty randomly-selected BAC clones were mapped onto Chinese pangolin chromosomes by fluorescence in situ hybridization (FISH), showing a largely unbiased chromosomal distribution. Several clones containing repetitive DNA and ribosomal DNA genes were also found. The BAC library and FISH mapped BAC clones are useful resources for comparative genomics and cytogenetics of mammals and in particular, the ongoing genome sequencing project of Chinese pangolins. 相似文献
6.
Jamsari A Nitz I Reamon-Büttner SM Jung C 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2004,108(6):1140-1146
A HindIII BAC (bacterial artificial chromosome) library of asparagus (Asparagus officinalis L.) was established from a single male plant homozygous for the male flowering gene (MM). The library represents approximately 5.5 haploid genome equivalents with an average insert size of 82 kb. A subset of the library (2.6 haploid genome equivalents) was arranged into DNA pools. Using nine sex-linked amplified fragment length polymorphism (AFLP) and two sequence-tagged site (STS) markers, 13 different BAC clones were identified from this part of the library. The BACs were arranged into a first-generation physical map around the sex locus. Four PCR-derived markers were developed from the BAC ends, one of which could be scored in a co-dominant way. Using a mapping population of 802 plants we mapped the BAC-derived markers to the same position close to the M gene as the corresponding AFLP and STS markers. The markers are useful for further chromosome walking studies and as diagnostic markers for selecting male plants homozygous for the M gene.Communicated by G. Wenzel 相似文献
7.
Jian-Mei Yin Wang-Zhen Guo Tian-Zhen Zhang 《植物学报(英文版)》2006,48(2):219-222
A bacterial artificial chromosome (BAC) library containing a large genomlc DNA insert is an important tool for genome physical mapping, map-based cloning, and genome sequencing. To Isolate genes via a map-based cloning strategy and to perform physical mapping of the cotton genome, a high-quality BAC library containing large cotton DNA Inserts Is needed. We have developed a BAC library of the restoring line 0-613-2R for Isolating the fertility restorer (Rf1) gene and genomic research in cotton (Gossypium hirsutum L.). The BAC library contains 97 825 clones stored In 255 pieces of a 384-well mlcrotiter plate. Random samples of BACs digested with the Notl enzyme Indicated that the average Insert size Is approximately 130 kb, with a range of 80-275 kb, and 95.7% of the BAC clones in the library have an average insert size larger than 100 kb. Based on a cotton genome size of 2 250 Mb, library coverage is 5.7 × haploid genome equivalents. Four clones were selected randomly from the library to determine the stability of the BAC clones. There were no different fingerprints for 0 and 100 generations of each clone digested with Notl and Hlndiii enzymes. Thus, the atabiiity of a single BAC clone can be sustained at iesat for 100 generations. Eight simple sequence repeat (SSR) markers flanking the Rf; gene were chosen to screen the BAC library by pool using PCR method and 25 positive clones were identified with 3.1 positive clones per SSR marker. 相似文献
8.
S. Zhu C. A. Saski H. R. Boerma J. P. Tomkins J. N. All W. A. Parrott 《Plant Molecular Biology Reporter》2009,27(2):229-235
Positional cloning of an insect-resistance quantitative trait locus (QTL) requires the construction of a large-insert genomic
DNA library from insect-resistant genotypes. To facilitate cloning of a major defoliating insect-resistance QTL on linkage
group M of the soybean genetic map, a bacterial artificial chromosome (BAC) library for PI 229358 was constructed and characterized.
The HindIII BAC library contains 55,296 clones with an average insert size 131 kb. This library represents a 6-fold soybean haploid
genome equivalents, allowing a 99.8% probability of recovering any specific sequence of interest in soybean. BAC filters were
screened with a genomic DNA probe Sat_258sc2 obtained through genome walking from flanking sequences of a simple sequence
repeat (SSR) marker, Sat_258, which links to the insect-resistance QTL. Thirteen BAC clones were identified positive for Sat_258sc2,
and two of them were confirmed to carry Sat_258. The results suggest that this library is useful in positional cloning of
the major insect-resistance QTL, and the approach presented here can be used to screen a BAC library for a SSR marker without
requiring the creation of BAC pools. 相似文献
9.
苏云金芽胞杆菌大质粒pBMB165的克隆与分析 总被引:1,自引:0,他引:1
以pBeloBAC11为载体,成功构建了苏云金芽胞杆菌YBT-1765的基因组人工染色体(BAC)文库和质粒BAC文库.根据已克隆的包含复制子ori165在内的3.6kb片段中编码复制蛋白Rep165的核苷酸序列设计探针,通过染色体步移方式,对质粒文库和基因组文库进行筛选,得到13个覆盖YBT-1765菌株中质粒pBMB165不同区域的克隆子.通过Hind Ⅲ和BamH Ⅰ酶切分析,建立了质粒pBMB165的物理图谱和线状重叠连锁图,并测算出该质粒的大小为82kb.根据部分核苷酸序列初步统计了pBMB165上转座因子的存在机率.YBT-1765菌株基因组文库的构建和物理图谱的绘制为克隆苏云金芽胞杆菌大质粒提供了一套可行的方案,成功解决了大质粒难克隆的问题. 相似文献
10.
Laurent Schibler Daniel Vaiman Anne Oustry Nathalie Guinec Anne-Laure Dangy-Caye Alain Billault Edmond P. Cribiu 《Mammalian genome》1998,9(2):119-124
A goat Bacterial Artificial Chromosome (BAC) library of 61,440 independent clones was constructed and characterized. The
average size of the inserts was estimated at 153 kilobases by analyzing almost 500 clones using Not1 digestion followed by FIGE (Field Inverted Gel Electrophoresis) analysis. The library represents about three genome equivalents,
which yields a theoretical probability of 0.95 of isolating a particular DNA sequence. After individual growth, the clones
were arrayed in 40 superpools, which were organized in three dimension pools. A rapid technique for pool DNA preparation by
microwave treatment was set up. This technique was compatible with PCR analysis. Primer pairs from 166 sequences (microsatellites,
coding sequences from goat, and conserved Expressed Sequence Tags (ESTs) from humans) enabled the library to be successfully
searched in 165 cases, with an average of 3.52 positive superpools. Only one sequence could not be found. The degree of chimerism
was evaluated by FISH analysis with DNA from over 110 clones and was estimated at 4%. This BAC library will constitute an
invaluable tool for positional cloning in ruminants, as well as for more general comparative mapping studies in mammals.
Received: 2 July 1997 / Accepted: 13 September 1997 相似文献
11.
BAC contig development by fingerprint analysis in soybean. 总被引:11,自引:0,他引:11
We constructed a soybean bacterial artificial chromosome (BAC) library suitable for map-based cloning and physical mapping in soybean. This library consists of approximately 40 000 clones (4-5 genome equivalents) stored individually in 384-well microtiter dishes. A random sampling of 224 clones yielded an average insert size of 150 kb, giving a 98% probability of recovering any specific sequence. We screened the library for seven single or very low copy genie or genomic sequences using the polymerase chain reaction (PCR) and found between one and seven BACs for each of the seven sequences. When testing the library with a portion of the soybean psbA chloroplast gene, we found less than 1% chloroplast DNA representation. We also screened the library for eight different classes of disease resistance gene analogs (RGAs) and identified BACs containing all RGAs except class 8. We arranged nine of the class 1 RGA BACs and six of the class 3 RGA BACs into individual contigs based on fingerprint patterns observed after Southern probing of restriction digests of the member BACs with a class-specific sequence. This resulted in the partial localization of the different multigene family sequences without precise definition of their exact positions. Using PCR-based end rescue techniques and RFLP mapping of BAC ends, we mapped individual BACs of each contig onto linkage group J of the soybean public map. The class 1 contig mapped to the region on linkage group J that contains several disease resistance genes. The class 1 contig extended approximately 400 kb. The arrangement of the BACs within this contig has been confirmed using PCR. One end of the class 1 contig core BAC mapped to two positions on linkage group J and cosegregated with two class 1 RGA loci, suggesting that this segment is within an area of regional duplication. 相似文献
12.
A major quantitative trait loci (QTL) conditioning common bacterial blight (CBB) resistance in common bean (Phaseolus vulgaris L.) lines HR45 and HR67 was derived from XAN159, a resistant line obtained from an interspecific cross between common bean
lines and the tepary bean (P. acutifolius L.) line PI319443. This source of CBB resistance is widely used in bean breeding. Several other CBB resistance QTL have been
identified but none of them have been physically mapped. Four molecular markers tightly linked to this QTL have been identified
suitable for marker assisted selection and physical mapping of the resistance gene. A bacterial artificial chromosome (BAC)
library was constructed from high molecular weight DNA of HR45 and is composed of 33,024 clones. The size of individual BAC
clone inserts ranges from 30 kb to 280 kb with an average size of 107 kb. The library is estimated to represent approximately
sixfold genome coverage. The BAC library was screened as BAC pools using four PCR-based molecular markers. Two to seven BAC
clones were identified by each marker. Two clones were found to have both markers PV-tttc001 and STS183. One preliminary contig
was assembled based on DNA finger printing of those positive BAC clones. The minimum tiling path of the contig contains 6
BAC clones spanning an estimated size of 750 kb covering the QTL region. 相似文献
13.
Tao Q Wang A Zhang HB 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2002,105(6-7):1058-1066
We report one large-insert BIBAC library and three BAC libraries for japonica rice cv Nipponbare. The BIBAC library was constructed in the HindIII site of a plant-transformation-competent binary vector (pCLD04541) and the three BAC libraries were constructed in the BamHI, HindIII and EcoRI sites of a BAC vector (pECBAC1), respectively. Each library contains 23,040 clones, has an average insert size of 130 kb, 170 kb, 150 kb and 156 kb, and covers 6.7x, 8.7x, 7.7x and 8.0 x rice haploid genomes, respectively. The combined libraries contain 92,160 clones in total, covering 31.1 x rice haploid genomes. To demonstrate their utility, we screened the libraries with 55 DNA markers mapped to chromosome 8 of the rice genetic maps and analyzed a number of clones by the restriction fingerprinting and contig assembly method. The results indicate that the libraries completely cover the rice genome and, thus, are well-suited for genome research in rice and other gramineous crops. The BIBAC library represents the first plant-transformation-competent large-insert DNA library for rice, which will streamline map-based cloning, functional analysis of the rice genome sequence and molecular breeding in rice and other grass species. These libraries are being used in the development of a whole-genome, BAC/BIBAC-based, integrated physical, genetic and sequence map of rice and in the research of genome-wide comparative genomics of grass species. 相似文献
14.
Construction and characterization of a bacterial artificial chromosome library of maize inbred line 77Ht2 总被引:1,自引:1,他引:0
Maize inbred line 77Ht2 contains agriculturally important genes and has been widely used in corn breeding in China. A bacterial
artificial chromosome (BAC) library of 77Ht2 has been constructed in order to identify useful genes and to facilitate the
study of the maize genome. The library contains 175104 clones with an average insert size of 57 kb and represents about 4
maize haploid genome equivalents. Characterization of the library showed less than 0.5% of clones to not contain large inserts.
Significant contamination of chloroplast and mitochondria DNA was not detected. BAC clones (152 arrays) were stored in 96
microtiter plates, with each well containing 12 clones. This is the first maize BAC library constructed in China. It is well
suited for map-based cloning of maize genes and genome physical mapping. 相似文献
15.
S. M. B. Cação N. V. Silva D. S. Domingues L. G. E. Vieira L. E. C. Diniz F. Vinecky G. S. C. Alves A. C. Andrade V. Carpentieri-Pipolo L. F. P. Pereira 《Genetica》2013,141(4-6):217-226
Most of the world’s coffee production originates from Coffea arabica, an allotetraploid species with low genetic diversity and for which few genomic resources are available. Genomic libraries with large DNA fragment inserts are useful tools for the study of plant genomes, including the production of physical maps, integration studies of physical and genetic maps, genome structure analysis and gene isolation by positional cloning. Here, we report the construction and characterization of a Bacterial Artificial Chromosome (BAC) library from C. arabica Timor Hybrid CIFC 832/2, a parental genotype for several modern coffee cultivars. The BAC library consists of 56,832 clones with an average insert size of 118 kb, which represents a dihaploid genome coverage of five to sixfold. The content of organellar DNA was estimated at 1.04 and 0.5 % for chloroplast and mitochondrial DNA, respectively. The BAC library was screened for the NADPH-dependent mannose-6-phosphate reductase gene (CaM6PR) with markers positioned on four linkage groups of a partial C. arabica genetic map. A mixed approach using PCR and membrane hybridization of BAC pools allowed for the discovery of nine BAC clones with the CaM6PR gene and 53 BAC clones that were anchored to the genetic map with simple sequence repeat markers. This library will be a useful tool for future studies on comparative genomics and the identification of genes and regulatory elements controlling major traits in this economically important crop species. 相似文献
16.
Naxin Huo Yong Q Gu Gerard R Lazo John P Vogel Devin Coleman-Derr Ming-Cheng Luo Roger Thilmony David F Garvin Olin D Anderson 《Génome》2006,49(9):1099-1108
Brachypodium is well suited as a model system for temperate grasses because of its compact genome and a range of biological features. In an effort to develop resources for genome research in this emerging model species, we constructed 2 bacterial artificial chromosome (BAC) libraries from an inbred diploid Brachypodium distachyon line, Bd21, using restriction enzymes HindIII and BamHI. A total of 73,728 clones (36,864 per BAC library) were picked and arrayed in 192,384-well plates. The average insert size for the BamHI and HindIII libraries is estimated to be 100 and 105 kb, respectively, and inserts of chloroplast origin account for 4.4% and 2.4%, respectively. The libraries individually represent 9.4- and 9.9-fold haploid genome equivalents with combined 19.3-fold genome coverage, based on a genome size of 355 Mb reported for the diploid Brachypodium, implying a 99.99% probability that any given specific sequence will be present in each library. Hybridization of the libraries with 8 starch biosynthesis genes was used to empirically evaluate this theoretical genome coverage; the frequency at which these genes were present in the library clones gave an estimated coverage of 11.6- and 19.6-fold genome equivalents. To obtain a first view of the sequence composition of the Brachypodium genome, 2185 BAC end sequences (BES) representing 1.3 Mb of random genomic sequence were compared with the NCBI GenBank database and the GIRI repeat database. Using a cutoff expectation value of E<10-10, only 3.3% of the BESs showed similarity to repetitive sequences in the existing database, whereas 40.0% had matches to the sequences in the EST database, suggesting that a considerable portion of the Brachypodium genome is likely transcribed. When the BESs were compared with individual EST databases, more matches hit wheat than maize, although their EST collections are of a similar size, further supporting the close relationship between Brachypodium and the Triticeae. Moreover, 122 BESs have significant matches to wheat ESTs mapped to individual chromosome bin positions. These BACs represent colinear regions containing the mapped wheat ESTs and would be useful in identifying additional markers for specific wheat chromosome regions. 相似文献
17.
Laurent Schibler Anne Roig Marie-Fran?oise Mahé Jean-Claude Save Mathieu Gautier Sead Taourit Didier Boichard André Eggen Edmond P Cribiu 《遗传、选种与进化》2004,36(1):105-122
A first generation clone-based physical map for the bovine genome was constructed combining, fluorescent double digestion fingerprinting and sequence tagged site (STS) marker screening. The BAC clones were selected from an Inra BAC library (105 984 clones) and a part of the CHORI-240 BAC library (26 500 clones). The contigs were anchored using the screening information for a total of 1303 markers (451 microsatellites, 471 genes, 127 EST, and 254 BAC ends). The final map, which consists of 6615 contigs assembled from 100 923 clones, will be a valuable tool for genomic research in ruminants, including targeted marker production, positional cloning or targeted sequencing of regions of specific interest. 相似文献
18.
The citrus tristeza virus resistance gene (Ctv) is a single dominant gene in Poncirus trifoliata, a sexually compatible relative of citrus. To clone this gene, a bacterial artificial chromosome (BAC) library has been constructed from an individual plant that was homozygous for Ctv. This library contains 45,696 clones with an average insert size of 80 kb, corresponding to 9.6 genome equivalents. Screening of the BAC library with five chloroplast DNA probes indicated that 0.58% of the BAC clones contained chloroplast-derived inserts. The chromosome walk across the Ctv locus was initiated using three closely linked genetic markers: C19, AD8, and Z16. The walk has been completed and a contig of ca. 1.2 Mb was constructed. Based on new data, the genetic map in the Ctv region was revised, with Ctv being located between AD8-Z16 and C19 at distances of 1.2 and 0.6 cM, respectively. Utilizing DNA fragments isolated from the contig as RFLP markers, the Ctv locus was further mapped to a region of ca. 300 kb. This contig contains several putative disease-resistance genes similar to the rice Xa21 gene, the tomato Cf-2 gene, and the Arabidopsis thaliana RPS2 gene. This library will therefore allow cloning of Ctv and other putative disease-resistance genes. 相似文献
19.
A maize bacterial artificial chromosome (BAC) library from the European flint inbred line F2 总被引:2,自引:0,他引:2
D. M. O’Sullivan P. J. Ripoll M. Rodgers K. J. Edwards 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2001,103(2-3):425-432
We report here the construction and characterisation of a BAC library from the maize flint inbred line F2, widely used in
European maize breeding programs. The library contains 86,858 clones with an average insert size of approximately 90 kb, giving
approximately 3.2-times genome coverage. High-efficiency BAC cloning was achieved through the use of a single size selection
for the high-molecular-weight genomic DNA, and co-transformation of the ligation with yeast tRNA to optimise transformation
efficiency. Characterisation of the library showed that less than 0.5% of the clones contained no inserts, while 5.52% of
clones consisted of chloroplast DNA. The library was gridded onto 29 nylon filters in a double-spotted 8 × 8 array, and screened
by hybridisation with a number of single-copy and gene-family probes. A 3-dimensional DNA pooling scheme was used to allow
rapid PCR screening of the library based on primer pairs from simple sequence repeat (SSR) and expressed sequence tag (EST)
markers. Positive clones were obtained in all hybridisation and PCR screens carried out so far. Six BAC clones, which hybridised
to a portion of the cloned Rp1-D rust resistance gene, were further characterised and found to form contigs covering most of this complex resistance locus.
Received: 30 August 2000 / Accepted: 6 December 2000 相似文献
20.
Construction of a swine BAC library: application to the characterization and mapping of porcine type C endoviral elements. 总被引:16,自引:0,他引:16
C Rogel-Gaillard N Bourgeaux A Billault M Vaiman P Chardon 《Cytogenetics and cell genetics》1999,85(3-4):205-211
A porcine bacterial artificial chromosome (BAC) library was constructed using the pBeloBAC11 vector. It comprised 107,520 clones with an average insert size of 135 kb, representing an almost fivefold coverage of the swine haploid genome. Screening of the library allowed recovery of one to eight clones for 142 unique markers located all over the genome, while it failed for only one marker. About 4% chimeric clones were found. The library was also screened for the protease gene of type C porcine endoviral sequences (PERVs), and 62 clones were recovered, all but two of which contained one protease gene. We found 20 protease sequences (PERV-1 to PERV-20) which, despite differing by point mutations, were all coding sequences. The most frequent sequence, PERV-2, was 100% similar to a protease sequence expressed in the porcine PK-15 cell line. Most of the clones harbored envelope genes. Thirty-three BAC clones were mapped by fluorescence in situ hybridization to 22 distinct locations on 14 chromosomes, including the X and Y chromosomes. These overall results indicate that there is generally one PERV copy per integration site. Although PERV sequences were not tandemly arranged, clusters of integration sites were observed at positions 3p1.5 and 7p1.1. Southern blot experiments revealed 20-30 PERV copies in the Large White pig genome studied here, and variations in PERV content among pigs of different breeds were observed. In conclusion, this BAC collection represents a significant contribution to the swine large genomic DNA cloned insert resources and provides the first detailed map of PERV sequences in the swine genome. This work is the first step toward identification of potential active sites of PERV elements. 相似文献