Related Experiment Video
Updated: Jun 27, 2026
Silencing of BRCA2 to Identify Novel BRCA2-regulated Biological Functions in Cultured Human Cells
Published on: August 12, 2015
Allele dependent silencing of COL1A2 using small interfering RNAs
Katarina Lindahl1, Carl-Johan Rubin, Andreas Kindmark
1Dept. of Medical Sciences, Uppsala University, Uppsala, Sweden.
Abstract:
Osteogenesis imperfecta (OI) is generally caused by a dominant mutation in Collagen I, encoded by the genes COL1A1 and COL1A2. To date there is no satisfactory therapy for OI, but inactivation of the mutant allele through small interfering RNAs (siRNA) is a promising approach, as siRNAs targeting each allele of a polymorphism could be used for allele-specific silencing irrespective of the location of the actual mutations. In this study we examined the allele dependent effects of several tiled siRNAs targeting a region surrounding an exonic COL1A2 T/C polymorphism (rs1800222) in heterozygous primary human bone cells. Relative abundances of COL1A2 alleles were determined by cDNA sequencing and overall COL1A2 abundance was analyzed by quantitative PCR. One of the siRNAs decreased overall COL1A2 abundance by 71% of which 75% was due to silencing of the targeted T-allele. In conclusion, allele-preferential silencing of Collagen type I genes may be a future therapeutic approach for OI.
Insights
Small interfering RNAs (siRNAs) show promise for treating Osteogenesis Imperfecta (OI) by silencing mutant Collagen I genes. This study demonstrates allele-specific silencing of COL1A2, a key gene in OI.
Area of Science:
- Genetics
- Molecular Biology
- Biochemistry
Background:
- Osteogenesis Imperfecta (OI) is a genetic disorder caused by dominant mutations in Collagen I genes (COL1A1, COL1A2).
- Current therapies for OI are limited, necessitating novel treatment strategies.
- Small interfering RNAs (siRNAs) offer a potential therapeutic avenue for allele-specific gene silencing.
Purpose of the Study:
- To investigate the allele-dependent effects of siRNAs targeting a COL1A2 polymorphism (rs1800222) in heterozygous human bone cells.
- To evaluate the efficacy of allele-specific silencing for potential OI therapy.
Main Methods:
- Utilized primary human bone cells heterozygous for a COL1A2 T/C polymorphism (rs1800222).
- Designed and applied tiled siRNAs targeting the polymorphic region.
- Quantified relative COL1A2 allele abundances using cDNA sequencing.
- Assessed overall COL1A2 gene expression via quantitative PCR.
Main Results:
- One siRNA demonstrated significant allele-preferential silencing, reducing overall COL1A2 abundance by 71%.
- This silencing was predominantly due to the inactivation of the targeted T-allele (75% contribution).
Conclusions:
- Allele-specific silencing of Collagen type I genes using siRNAs is a viable strategy.
- This approach holds potential as a future therapeutic strategy for Osteogenesis Imperfecta.
Related Concept Videos
02:15Experimental RNAi
02:30siRNA - Small Interfering RNAs
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
01:23RNA Interference
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
02:30Small interfering RNAs (siRNA)
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
01:22MicroRNAs
01:22MicroRNAs