Discovery of differentially expressed genes in human breast cancer using subtracted cDNA libraries and cDNA microarrays.

Abstract:

:Identifying novel and known genes that are differentially expressed in breast cancer has important implications in understanding the biology of breast tumorigenesis and developing new diagnostic and therapeutic agents. In this study we have combined two powerful technologies, PCR-based cDNA subtraction and cDNA microarray, as a high throughput methodology designed to identify cDNA clones that are breast tumor- and tissue-specific and are overexpressed in breast tumors. Approximately 2000 cDNA clones generated from the subtracted breast tumor library were arrayed on the microarray chips. The arrayed target cDNAs were then hybridized with 30 pairs of fluorescent-labeled cDNA probes generated from breast tumors and normal tissues to determine the tissue distribution and tumor specificity. cDNA clones showing overexpression in breast tumors by microarray were further analysed by DNA sequencing, GenBank and EST database searches, and quantitative real time PCR. We identified several known genes, including mammaglobin, cytokeratin 19, fibronectin, and hair-specific type II keratin, which have previously been shown to be overexpressed in breast tumors and may play an important role in the malignance of breast. We also discovered B726P which appears to be an isoform of NY-BR-1, a breast tissue-specific gene. Two additional clones discovered, B709P and GABA(A) receptor pi subunit, were not previously described for their overexpression profile in breast tumors. Thus, combining PCR-based cDNA subtraction and cDNA microarray allowed for an efficient way to identify and validate genes with elevated mRNA expression levels in breast cancer that may potentially be involved in breast cancer progression. These differentially expressed genes may be of potential utility as therapeutic and diagnostic targets for breast cancer.

journal_name

Oncogene

journal_title

Oncogene

authors

Jiang Y,Harlocker SL,Molesh DA,Dillon DC,Stolk JA,Houghton RL,Repasky EA,Badaro R,Reed SG,Xu J

doi

10.1038/sj.onc.1205278

subject

Has Abstract

pub_date

2002-03-28 00:00:00

pages

2270-82

issue

14

eissn

0950-9232

issn

1476-5594

journal_volume

21

pub_type

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