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[Modulation of the rate of mRNA poly(A)-segment shortening during embryonal and postnatal development]
Abstract:
A procedure for determination of the rate of poly(A) degradation based on a comparative analysis of poly(A)-segments of impulse-labelled mRNA under conditions of subsequent blocking of poly(A) synthesis by cordycepin was developed. The method described was used to analyze the rate of shorting of the poly(A)-segment of mRNA in the liver and brain cortex of the rat during the embryonic and postnatal development. It was shown that throughout ontogenesis the rate of poly(A) degradation in liver cells is significantly higher than in brain cortex cells for both types of polyribosomal mRNAs, the rate of poly(A) degradation within free polyribosomal mRNA being higher as compared to the membrane-bound mRNA for both tissues. On the 17th embryonic day the rate of poly(A) degradation is high in both polyribosomal types; it is decreased by the moment of birth and is either increased in the postnatal life or remains unchanged (free polyribosomes of the liver and membrane-bound polyribosomes of brain cortex).
Insights
This study developed a method to measure poly(A) tail shortening in mRNA. Liver cells show faster poly(A) degradation than brain cells across development.
Area of Science:
- Molecular Biology
- Developmental Biology
- Biochemistry
Context:
- Messenger RNA (mRNA) plays a crucial role in gene expression.
- The poly(A) tail of mRNA is a key regulatory element influencing mRNA stability and translation.
- Understanding poly(A) tail dynamics is essential for comprehending gene expression regulation during development.
Purpose:
- To develop and validate a novel method for quantifying the rate of poly(A) degradation in mRNA.
- To investigate the developmental changes in poly(A) tail shortening rates in rat liver and brain cortex.
- To compare poly(A) degradation rates between different cellular compartments (free vs. membrane-bound polyribosomes) and developmental stages.
Summary:
- A new procedure was established to determine poly(A) degradation rates by analyzing impulse-labeled mRNA poly(A) segments after blocking poly(A) synthesis with cordycepin.
- This method revealed significant differences in poly(A) degradation rates between rat liver and brain cortex during embryonic and postnatal development.
- Liver cells exhibited higher poly(A) degradation rates than brain cells, and within both tissues, free polyribosomal mRNA showed faster degradation than membrane-bound mRNA.
Impact:
- Provides a refined technique for studying mRNA decay dynamics.
- Offers new insights into tissue-specific and developmental regulation of mRNA stability.
- Highlights the differential regulation of poly(A) tail turnover in various cellular contexts, contributing to our understanding of gene expression control.