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Alternative Splicing of RAD6B and Not RAD6A is Selectively Increased in Melanoma: Identification and Functional
Ambikai Gajan1,2, Carly E Martin3,4, Seongho Kim5,6
1Karmanos Cancer Institute, Detroit, MI 48201, USA. gajana@karmanos.org.
Cells
|November 6, 2019
Summary
Rad6B, crucial for melanoma progression, shows distinct gene expression and splice variants in tumors compared to normal cells. These functional Rad6B variants highlight melanoma
Area of Science:
- Molecular Biology
- Cancer Research
- Genetics
Background:
- Rad6B is a key protein in DNA repair and Wnt signaling, vital for melanoma development.
- Human Rad6 is encoded by two genes: UBE2A (RAD6A) and UBE2B (RAD6B).
Purpose of the Study:
- To compare the expression of RAD6A and RAD6B in melanomas versus normal melanocytes.
- To investigate the role of RAD6B splice variants in melanoma pathogenesis.
Main Methods:
- Gene expression analysis of RAD6A and RAD6B in melanoma cell lines and patient samples.
- Characterization of RAD6B splice variants, including identification and functional assessment of specific isoforms (RAD6BΔexon4, RAD6Bintron5ins).
- Whole exome sequencing of patient-derived melanomas to analyze RAD6B variant coexpression.
Main Results:
- RAD6B is significantly more expressed in melanomas than RAD6A.
- Melanomas exhibit diverse RAD6B splice variants, including functional RAD6BΔexon4 and RAD6Bintron5ins, which are absent in normal melanocytes.
- RAD6B variants are coexpressed with wild-type RAD6B in all analyzed melanomas and constitute the majority of the RAD6B transcriptome.
Conclusions:
- The expression of functional RAD6B variants is specific to melanomas, indicating molecular heterogeneity.
- RAD6B variants are strongly associated with melanoma pathogenesis and progression.
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