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Related Concept Videos

Determination01:51

Determination

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During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In...
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Quantitative Analysis of Protein Expression to Study Lineage Specification in Mouse Preimplantation Embryos
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Expression patterns and biological function of Specc1 during mouse preimplantation development.

Seulah Lee1, Inchul Choi1

  • 1Division of Animal and Dairy Sciences, College of Agriculture and Life Sciences, Chungnam University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea.

Gene Expression Patterns : GEP
|June 24, 2021
PubMed
Summary

Sperm antigen with calponin homology and coiled-coil domains 1 (SPECC1) is crucial for mouse blastocyst development. Knockdown embryos showed reduced blastocyst formation and increased tight junction permeability, highlighting SPECC1's role in early embryonic development.

Keywords:
BlastocystMouse embryoPreimplantationSpecc1Tight junctions

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Genetics

Background:

  • Preimplantation embryo development involves critical events like cell adhesion, polarity establishment, and blastocoel formation.
  • Key genes regulating morula and blastocyst formation are largely unknown.
  • Sperm antigen with calponin homology and coiled-coil domains 1 (SPECC1) is known for roles in testis and tumor cells, but its function in early development is unclear.

Purpose of the Study:

  • To investigate the spatiotemporal expression of SPECC1 during mouse preimplantation development.
  • To elucidate the biological function of SPECC1 in early embryonic development, particularly in blastocyst formation.

Main Methods:

  • Quantitative reverse transcription PCR (qRT-PCR) and immunocytochemistry were used to analyze SPECC1 expression.
  • Small interfering RNA (siRNA) was injected into 1-cell zygotes to create SPECC1 knockdown (KD) embryos.
  • Blastocyst development and tight junction permeability (using FITC uptake) were assessed in KD and control embryos.

Main Results:

  • SPECC1 expression was detected throughout preimplantation development, increasing significantly from the morula stage onwards.
  • SPECC1 was predominantly localized in trophectoderm cells of blastocysts.
  • SPECC1 knockdown resulted in significantly reduced blastocyst development and increased tight junction permeability compared to controls.

Conclusions:

  • Elevated SPECC1 expression in morula and blastocyst stages is critical for proper blastocyst formation.
  • SPECC1 plays a vital role in establishing and maintaining the integrity of the tight junction complex during the morula to blastocyst transition.
  • SPECC1 is a key regulator of early mouse embryonic development, impacting blastocyst formation and barrier function.