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Temperature may influence and regulate NF-YB expression in toad oocyte.

Shan Yan1, Jiake Tso

  • 1Shanghai Medical College, Fudan University, Shanghai 200032, PR China. yanshan007@yahoo.com.cn

Biochemical and Biophysical Research Communications
|December 31, 2003
PubMed
Summary
This summary is machine-generated.

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Researchers discovered that temperature changes affect the expression of the NF-YB gene in toad oocytes, which influences their ability to mature. By comparing oocytes kept at cold versus warm temperatures, the study identified specific gene variants that may control meiosis.

Area of Science:

  • Developmental biology research within NF-YB gene regulation studies
  • Reproductive physiology of amphibians

Background:

No prior work had resolved how environmental thermal conditions dictate the developmental potential of amphibian gametes. It was already known that oocytes require specific molecular signals to initiate maturation processes. That uncertainty drove interest in identifying genes that respond to thermal shifts. Prior research has shown that cold exposure often triggers physiological adaptations in ectothermic organisms. This gap motivated an investigation into the molecular mechanisms underlying temperature-dependent maturation competence. Scientists previously established that fully grown oocytes from certain toads fail to progress when held at elevated temperatures. Understanding these regulatory pathways remains a challenge in reproductive biology. The current study addresses this by examining gene expression profiles in toad oocytes under varying thermal regimes.

Purpose Of The Study:

The aim of this study was to investigate how temperature influences and regulates NF-YB expression in toad oocytes. Researchers sought to understand the molecular basis for the observed differences in meiotic competence between thermal groups. They hypothesized that specific genes respond to environmental temperature shifts to control developmental progression. The study addressed the problem of why oocytes maintained at high temperatures fail to mature. By comparing cold-treated and warm-treated samples, the team aimed to identify differentially expressed genetic markers. This investigation was motivated by the need to clarify the link between external thermal conditions and internal gene regulation. The researchers focused on characterizing the full-length gene and its various spliced forms. Ultimately, the work intended to provide evidence for a temperature-dependent regulatory mechanism in amphibian gametes.

Keywords:
amphibian developmentthermal regulationgene splicingmeiosis competence

Frequently Asked Questions

The researchers propose that temperature regulates NF-YB expression, which subsequently affects the CCAAT-binding activity of the NF-Y complex. This molecular shift is linked to the ability of oocytes to resume meiosis, a process that occurs in cold-treated but not warm-treated cells.

The study identified three alternatively spliced transcripts, labeled tNF-YB1, tNF-YB2, and tNF-YB3. These variants were isolated using Rapid Amplification of cDNA Ends (RACE) after initial screening via suppression subtractive hybridization.

Suppression subtractive hybridization was necessary to isolate 18 expressed sequence tags that showed preferential expression in cold-treated oocytes. This technique allowed the researchers to compare gene activity between the two thermal groups effectively.

The researchers utilized expressed sequence tags to identify candidate genes that respond to thermal stress. These sequences served as the foundation for cloning the full-length toad NF-YB gene and characterizing its alternative splicing patterns.

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Main Methods:

The research team utilized suppression subtractive hybridization to isolate genes showing differential expression patterns. They compared fully grown oocytes maintained at four degrees Celsius against those kept at twenty-eight degrees Celsius. Rapid Amplification of cDNA Ends served as the primary tool for cloning the full-length genetic sequences. The investigators identified three distinct alternatively spliced transcripts through this cloning process. They performed transcriptional and translational analyses to assess the activity of the target gene. The study also monitored the expression levels of cyclin B2 under these specific thermal conditions. This approach allowed for a direct comparison of molecular profiles between the two experimental groups. The researchers synthesized these observations to determine how thermal environments impact gene regulation during development.

Main Results:

The strongest finding indicates that NF-YB expression is differentially regulated by temperature in toad oocytes. Cold-treated oocytes acquired maturation competence, whereas those kept at high temperatures failed to reach this developmental stage. The researchers successfully cloned the full-length toad gene and identified three distinct alternatively spliced transcripts. These transcripts were assigned GenBank accession numbers AY442015, AY442016, and AY442017. The study observed that NF-YB transcription and translation levels varied significantly between the two thermal groups. This differential expression likely results in altered CCAAT-binding activity for the NF-Y complex. Additionally, the team found that cyclin B2 transcription is also sensitive to these thermal fluctuations. These results provide the first evidence that temperature influences the expression of this specific transcription factor.

Conclusions:

The authors propose that thermal conditions modulate the transcriptional activity of the NF-YB gene in toad oocytes. This study provides the initial evidence that environmental temperature influences the expression of this specific transcription factor. The researchers suggest that differential splicing of the gene transcripts may alter CCAAT-binding capabilities. These findings imply that temperature-sensitive gene regulation plays a role in acquiring maturation competence. The data indicate that cyclin B2 expression also fluctuates in response to thermal changes. The authors conclude that these molecular shifts likely contribute to the observed differences in meiotic progression. This work highlights a potential link between external environmental factors and internal genetic control mechanisms. Future investigations could clarify the precise signaling pathways connecting temperature sensing to these observed transcriptional changes.

The study measured the differential transcription and translation of NF-YB in oocytes kept at 4 degrees Celsius versus 28 degrees Celsius. These measurements revealed that temperature dictates the levels of these gene products.

The authors propose that the differential expression of NF-YB and cyclin B2 provides a molecular basis for the observed differences in maturation competence between the two temperature groups. This suggests a direct link between environmental thermal history and gamete development.