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Differential expression of four human dynamin-like protein variants in brain tumors
C H Chen1, S L Howng, S L Hwang
1Graduate Institute of Biochemistry, Kaohsiung Medical College, Taiwan, ROC.
Abstract:
Dynamin-like protein, a large GTP-binding protein, has recently been cloned, and studies have suggested that it is involved in the formation of coated vesicles. In this report, the differential expression of four human dynamin-like protein splice variants (HdynIV-wildtype [WT], -11, -26, and -37) from various brain tumors was identified by reverse transcription/polymerase chain reaction (RT-PCR). One novel variant (HdynIV-11), not described previously, was identified. The four alternatively spliced variants exhibited tissue specificity in normal tissues. The HdynIV-WT was strongly expressed in the brain, whereas HdynIV-37 was expressed in all tissues examined. Moreover, HdynIV-26 was dominant in the liver and apparently overexpressed in all astrocytomas and most meningiomas and adenomas. This report suggests that HdynIV-26 may cause aberrant protein trafficking and alter vesicle formation in brain tumors. Our results also suggest that dynamin-like protein is associated with various brain tumors and, more importantly, that aberrant expression of the HdynIV-26 variant may play a role in brain tumorigenesis.
Insights
Researchers identified four human dynamin-like protein splice variants in brain tumors. Aberrant expression of the HdynIV-26 variant may contribute to brain tumor development by affecting protein trafficking and vesicle formation.
Area of Science:
- Molecular Biology
- Oncology
- Cell Biology
Background:
- Dynamin-like protein (DLP) is a large GTP-binding protein implicated in coated vesicle formation.
- Alternative splicing generates multiple DLP splice variants with potentially distinct functions.
Purpose of the Study:
- To investigate the differential expression of human dynamin-like protein (HdynIV) splice variants in brain tumors.
- To identify novel HdynIV splice variants and assess their tissue-specific expression patterns.
Main Methods:
- Reverse transcription/polymerase chain reaction (RT-PCR) was employed to analyze HdynIV splice variant expression.
- Expression levels were examined in various normal tissues and human brain tumors, including astrocytomas, meningiomas, and adenomas.
Main Results:
- Four HdynIV splice variants (HdynIV-wildtype [WT], -11, -26, and -37) were identified, including a novel variant (HdynIV-11).
- Distinct tissue-specific expression patterns were observed for the variants in normal tissues.
- HdynIV-26 showed dominant expression in the liver and was overexpressed in astrocytomas, meningiomas, and adenomas.
Conclusions:
- Dynamin-like protein is associated with various brain tumors.
- Aberrant expression of the HdynIV-26 variant may play a role in brain tumorigenesis, potentially by disrupting protein trafficking and vesicle formation.