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Molecular cloning, chromosomal mapping, and developmental expression of a novel protein tyrosine phosphatase-like
D A Uwanogho1, Z Hardcastle, P Balogh
1Department of Craniofacial Development, Kings College at Guy's Hospital, London.
Abstract:
Protein tyrosine phosphatases (PTPs) mediate the dephosphorylation of phosphotyrosine. PTPs are known to be involved in many signal transduction pathways leading to cell growth, differentiation, and oncogenic transformation. We have cloned a new family of novel protein tyrosine phosphatase-like genes, the Ptpl (protein tyrosine phosphatase-like; proline instead of catalytic arginine) gene family. This gene family is composed of at least three members, and we describe here the developmental expression pattern and chromosomal location for one of these genes, Ptpla. In situ hybridization studies revealed that Ptpla expression was first detected at embryonic day 8.5 in muscle progenitors and later in differentiated muscle types: in the developing heart, throughout the liver and lungs, and in a number of neural crest derivatives including the dorsal root and trigeminal ganglia. Postnatally Ptpla was expressed in a number of adult tissues including cardiac and skeletal muscle, liver, testis, and kidney. The early expression pattern of this gene and its persistent expression in adult tissues suggest that it may have an important role in the development, differentiation, and maintenance of a number of different tissue types. The human homologue of Ptpla (PTPLA) was cloned and shown to map to 10p13-p14.
Insights
A new protein tyrosine phosphatase-like (Ptpl) gene family was identified. The Ptpla gene shows early expression in developing tissues and persists in adult organs, suggesting a crucial role in tissue development and maintenance.
Area of Science:
- Molecular Biology
- Genetics
- Developmental Biology
Background:
- Protein tyrosine phosphatases (PTPs) are key regulators of signal transduction pathways.
- Dysregulation of PTPs is implicated in cell growth, differentiation, and cancer.
- A novel PTP-like gene family, Ptpl, has been identified.
Purpose of the Study:
- To characterize the developmental expression pattern of a novel gene, Ptpla.
- To determine the chromosomal location of the Ptpla gene and its human homologue.
Main Methods:
- Cloning of the Ptpl gene family.
- In situ hybridization to analyze gene expression patterns during development.
- Chromosomal mapping of the human PTPLA gene.
Main Results:
- Ptpla expression was detected starting at embryonic day 8.5 in muscle progenitors.
- Ptpla expression was observed in developing heart, liver, lungs, and neural crest derivatives.
- Postnatal expression included cardiac and skeletal muscle, liver, testis, and kidney.
- The human homologue, PTPLA, was mapped to chromosome 10p13-p14.
Conclusions:
- The Ptpl gene family represents a novel class of PTP-like genes.
- Ptpla's early and persistent expression suggests a significant role in tissue development, differentiation, and maintenance.
- The localization of PTPLA provides a basis for further investigation into its function and potential involvement in human diseases.