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Localization of an epithelial-specific receptor kinase (EDDR1) to chromosome 6q16
A N Shelling1, R Butler, T Jones
1ICRF Laboratories, Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, United Kingdom.
Abstract:
A protein receptor tyrosine kinase (EDDR1) has been isolated from a complementary DNA library of SKOV-3, an epithelial ovarian cancer cell line. The primary structure of the predicted amino acid sequence of the protein shows a novel N-terminal region that has homology to a factor VIII-like domain. The C-terminal catalytic domain has all of the canonical sequence motifs of a receptor tyrosine kinase with homology to the TRK-2H protein (49%), which suggests that it is a type II receptor. It is expressed in epithelial cells of several tissues. To determine the chromosomal localization of the gene, somatic cell hybrids were analyzed by PCR amplification using oligonucleotide primers specific for EDDR1. Segregation was observed to a hybrid containing human chromosome 6. Cosmids for EDDR1 were isolated from a human chromosome 6 cosmid library and were shown by fluorescence in situ hybridization to map to 6q16.
Insights
Researchers identified a novel receptor tyrosine kinase, EDDR1, in ovarian cancer cells. The EDDR1 gene was localized to chromosome 6q16, providing insights into its potential role in epithelial cancers.
Area of Science:
- Molecular Biology
- Genetics
- Oncology
Background:
- Ovarian cancer is a significant health concern, necessitating the identification of novel therapeutic targets.
- Receptor tyrosine kinases (RTKs) play crucial roles in cell signaling and are frequently implicated in cancer development.
Purpose of the Study:
- To isolate and characterize a novel receptor tyrosine kinase (EDDR1) from an epithelial ovarian cancer cell line.
- To determine the chromosomal localization of the EDDR1 gene.
Main Methods:
- Complementary DNA library screening of SKOV-3 cells.
- Amino acid sequence analysis to predict protein structure and homology.
- Polymerase Chain Reaction (PCR) amplification using somatic cell hybrids.
- Fluorescence in situ hybridization (FISH) for precise gene mapping.
Main Results:
- A novel receptor tyrosine kinase, EDDR1, was isolated and characterized.
- EDDR1 possesses a unique N-terminal domain with homology to Factor VIII and a C-terminal catalytic domain characteristic of type II RTKs, showing homology to TRK-2H.
- The EDDR1 gene was mapped to chromosome 6q16.
Conclusions:
- EDDR1 is a novel type II receptor tyrosine kinase expressed in epithelial cells.
- The specific chromosomal localization of EDDR1 to 6q16 provides a basis for further investigation into its function and potential role in ovarian cancer and other epithelial malignancies.