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Cloning and functional analysis of cDNAs with open reading frames for 300 previously undefined genes expressed in
1Shanghai Institute of Hematology (SIH), Rui Jin Hospital affiliated with Shanghai Second Medical University, Shanghai 200025, China.
Insights
Researchers identified 300 novel genes from hematopoietic stem/progenitor cells (HSPCs). This comprehensive catalog aids in understanding gene function in blood development and differentiation.
Area of Science:
- Genomics
- Molecular Biology
- Hematopoiesis
Background:
- Hematopoietic stem/progenitor cells (HSPCs) are crucial for blood cell formation.
- Identifying novel genes within HSPCs is essential for understanding hematopoiesis.
- Existing gene catalogs may not fully represent the diversity of genes in HSPCs.
Purpose of the Study:
- To identify and characterize novel genes from CD34+ HSPCs.
- To analyze the sequence, structure, and homology of these newly identified genes.
- To investigate the expression patterns of these genes in various hematopoietic cell lines.
Main Methods:
- Expressed Sequence Tag (EST) cataloging, sequencing, in silico cloning, and rapid amplification of cDNA ends (RACE).
- Public database searches for sequence similarity and homology analysis to identify structural motifs/domains.
- Integration of cDNA data with genome sequence information for exon-intron organization.
- Electronic and radiation hybrid (RH) mapping for chromosomal localization.
- Macroarray technique for screening gene expression patterns.
Main Results:
- 300 cDNAs with putative full open reading frames (ORFs) were identified.
- 225 cDNAs showed sequence similarity to known genes, revealing 50 structural motifs/domains.
- Genomic organization was determined for 243 genes, and chromosomal localizations for 230 genes.
- A novel gene, HSPC070, was identified with a unique 3' UTR sequence shared with the RAF gene.
- Differential gene expression was observed in five hematopoietic cell lines.
Conclusions:
- This study provides a valuable resource of novel genes from HSPCs.
- The findings contribute to expression genomics and genomic DNA sequence annotation.
- The identified genes offer insights into the molecular mechanisms of hematopoietic development and differentiation.
Abstract:
Three hundred cDNAs containing putatively entire open reading frames (ORFs) for previously undefined genes were obtained from CD34+ hematopoietic stem/progenitor cells (HSPCs), based on EST cataloging, clone sequencing, in silico cloning, and rapid amplification of cDNA ends (RACE). The cDNA sizes ranged from 360 to 3496 bp and their ORFs coded for peptides of 58-752 amino acids. Public database search indicated that 225 cDNAs exhibited sequence similarities to genes identified across a variety of species. Homology analysis led to the recognition of 50 basic structural motifs/domains among these cDNAs. Genomic exon-intron organization could be established in 243 genes by integration of cDNA data with genome sequence information. Interestingly, a new gene named as HSPC070 on 3p was found to share a sequence of 105bp in 3' UTR with RAF gene in reversed transcription orientation. Chromosomal localizations were obtained using electronic mapping for 192 genes and with radiation hybrid (RH) for 38 genes. Macroarray technique was applied to screen the gene expression patterns in five hematopoietic cell lines (NB4, HL60, U937, K562, and Jurkat) and a number of genes with differential expression were found. The resource work has provided a wide range of information useful not only for expression genomics and annotation of genomic DNA sequence, but also for further research on the function of genes involved in hematopoietic development and differentiation.