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Abstract:

Background: Subtractive hybridization methods are valuable tools for identifying differentially regulated genes in a given tissue avoiding redundant sequencing of clones representing the same expressed genes, maximizing detection of low abundant transcripts and thus, affecting the efficiency and cost effectiveness of small scale cDNA sequencing projects aimed to the specific identification of useful genes for breeding purposes. The objective of this work is to evaluate alternative strategies to high-throughput sequencing projects for the identification of novel genes differentially expressed in sunflower as a source of organ-specific genetic markers that can be functionally associated to important traits. Results: Differential organ-specific ESTs were generated from leaf, stem, root and flower bud at two developmental stages (R1 and R4). The use of different sources of RNA as tester and driver cDNA for the construction of differential libraries was evaluated as a tool for detection of rare or low abundant transcripts. Organ-specificity ranged from 75 to 100% of non-redundant sequences in the different cDNA libraries. Sequence redundancy varied according to the target and driver cDNA used in each case. The R4 flower cDNA library was the less redundant library with 62% of unique sequences. Out of a total of 919 sequences that were edited and annotated, 318 were non-redundant sequences. Comparison against sequences in public databases showed that 60% of non-redundant sequences showed significant similarity to known sequences. The number of predicted novel genes varied among the different cDNA libraries, ranging from 56% in the R4 flower to 16 % in the R1 flower bud library. Comparison with sunflower ESTs on public databases showed that 197 of non-redundant sequences (60%) did not exhibit significant similarity to previously reported sunflower ESTs. This approach helped to successfully isolate a significant number of new reported sequences putatively related to responses to important agronomic traits and key regulatory and physiological genes. Conclusions: The application of suppressed subtracted hybridization technology not only enabled the cost effective isolation of differentially expressed sequences but it also allowed the identification of novel sequences in sunflower from a relative small number of analyzed sequences when compared to major sequencing projects. © 2003 Fernández et al; licensee BioMed Central Ltd.

Registro:

Documento: Artículo
Título:Differential representation of sunflower ESTs in enriched organ-specific cDNA libraries in a small scale sequencing project
Autor:Fernández, P.; Paniego, N.; Lew, S.; Hopp, H.E.; Heinz, R.A.
Filiación:Unidad Integrada de Investigacion, Instituto de Biotecnologia, CICVyA-INTA Casterlar, 1712 Castelar, Buenos Aires, Argentina
Depto. de Fisiol. Biol. Molec./Cell., Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Palabras clave:EST; Helianthus annuus; Organ-specific transcripts; SSH; Sunflower; complementary DNA; RNA; complementary DNA; agronomic trait; article; breeding; controlled study; cost effectiveness analysis; developmental stage; DNA library; DNA sequence; expressed sequence tag; flower; gene expression; gene function; gene identification; gene isolation; gene sequence; genetic association; genetic regulation; genetic trait; genetic transcription; marker gene; molecular cloning; nonhuman; nucleotide sequence; plant genetics; plant leaf; plant root; plant stem; prediction; redundancy analysis; regulator gene; sequence analysis; sequence database; sequence homology; subtractive hybridization; sunflower; tissue specificity; chemistry; comparative study; expressed sequence tag; gene expression profiling; gene expression regulation; gene library; genetics; growth, development and aging; methodology; nucleic acid hybridization; reproducibility; sensitivity and specificity; sunflower; Helianthus; Helianthus annuus; DNA, Complementary; Expressed Sequence Tags; Flowers; Gene Expression Profiling; Gene Expression Regulation, Developmental; Gene Expression Regulation, Plant; Gene Library; Helianthus; Nucleic Acid Hybridization; Plant Leaves; Plant Roots; Plant Stems; Reproducibility of Results; Sensitivity and Specificity; Sequence Analysis, DNA
Año:2003
Volumen:4
DOI: http://dx.doi.org/10.1186/1471-2164-4-40
Título revista:BMC Genomics
Título revista abreviado:BMC Genomics
ISSN:14712164
CODEN:BGMEE
CAS:RNA, 63231-63-0; DNA, Complementary
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_14712164_v4_n_p_Fernandez.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14712164_v4_n_p_Fernandez

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Citas:

---------- APA ----------
Fernández, P., Paniego, N., Lew, S., Hopp, H.E. & Heinz, R.A. (2003) . Differential representation of sunflower ESTs in enriched organ-specific cDNA libraries in a small scale sequencing project. BMC Genomics, 4.
http://dx.doi.org/10.1186/1471-2164-4-40
---------- CHICAGO ----------
Fernández, P., Paniego, N., Lew, S., Hopp, H.E., Heinz, R.A. "Differential representation of sunflower ESTs in enriched organ-specific cDNA libraries in a small scale sequencing project" . BMC Genomics 4 (2003).
http://dx.doi.org/10.1186/1471-2164-4-40
---------- MLA ----------
Fernández, P., Paniego, N., Lew, S., Hopp, H.E., Heinz, R.A. "Differential representation of sunflower ESTs in enriched organ-specific cDNA libraries in a small scale sequencing project" . BMC Genomics, vol. 4, 2003.
http://dx.doi.org/10.1186/1471-2164-4-40
---------- VANCOUVER ----------
Fernández, P., Paniego, N., Lew, S., Hopp, H.E., Heinz, R.A. Differential representation of sunflower ESTs in enriched organ-specific cDNA libraries in a small scale sequencing project. BMC Genomics. 2003;4.
http://dx.doi.org/10.1186/1471-2164-4-40