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Expression and chromosomal localization of the Requiem gene
Abstract:
Apoptosis in murine myeloid cell lines requires the expression of the Requiem gene, which encodes a putative zinc finger protein. We detected the protein in both cytoplasmic and nuclear subcellular fractions of murine myeloid cells and human K562 leukemia cells, which suggests that the protein might have a function distinct from a transcription factor. This distribution did not alter upon apoptosis induction by IL-3 deprivation. As an approach to investigate its role in development, we determined the spatio-temporal expression pattern in the mouse. Expression was detected in various tissues in earlier gestational age; however, confined to testes, spleen, thymus, and part of the hippocampus in the adult mouse. The expression profile is consistent with a functional role during rapid growth and cell turnover, and in agreement with a regulatory function for hematopoietic cells. The human cDNA clone sequenced showed high homology to its murine counterpart and extended the open reading frame by 20 codons upstream. The gene is located in the proximal region of mouse Chromosome (Chr) 19. In the homologous human region at 11q13, it is located at about 150 kb centromeric from MLK3.
Insights
The Requiem gene is essential for apoptosis in myeloid cells. Its protein is found in the cytoplasm and nucleus, with expression patterns suggesting roles in development and hematopoietic cell regulation.
Area of Science:
- Molecular Biology
- Cell Biology
- Genetics
Background:
- Apoptosis is a critical process in multicellular organisms.
- The Requiem gene encodes a zinc finger protein involved in apoptosis.
- Understanding Requiem's function and expression is key to cell regulation.
Purpose of the Study:
- To investigate the subcellular localization and spatio-temporal expression of the Requiem protein.
- To explore the potential role of Requiem in cellular processes and development.
- To identify the chromosomal location of the Requiem gene in mice and humans.
Main Methods:
- Detection of Requiem protein in cytoplasmic and nuclear fractions.
- Analysis of Requiem expression patterns in various mouse tissues during development.
- Gene sequencing and chromosomal mapping of the Requiem gene.
Main Results:
- Requiem protein detected in both cytoplasmic and nuclear fractions of myeloid and leukemia cells.
- Expression pattern changes from widespread in early development to specific tissues (testes, spleen, thymus, hippocampus) in adult mice.
- High homology between human and murine Requiem cDNA; gene located on mouse Chr 19 and human 11q13.
Conclusions:
- Requiem protein's dual localization suggests functions beyond transcription factors.
- Expression profile supports a role in rapid cell turnover, development, and hematopoietic regulation.
- Comparative gene mapping provides insights into conserved functions and evolutionary relationships.