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Updated: Jan 8, 2026

Quantitative Analysis of Protein Expression to Study Lineage Specification in Mouse Preimplantation Embryos

Quantitative Analysis of Protein Expression to Study Lineage Specification in Mouse Preimplantation Embryos

Published on: February 22, 2016

LYAR Regulates Ribosomal Genes to Impact the First Lineage Differentiation During Mouse Preimplantation Development.

Wenyao Zhou¹, Yuchen Sun¹, Xinglin Hu¹

¹Department of Histology and Embryology, Harbin Medical University, Harbin, China.

Anatomia, Histologia, Embryologia

|December 17, 2025

Summary

Nucleolar protein LYAR regulates ribosome biogenesis, impacting early mouse embryonic development. Knocking down LYAR affects the first lineage differentiation and inner cell mass formation, revealing a link between ribosome production and embryonic development.

Keywords:

ribosomal genes ribosome biogenesis the first lineage differentiation

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Loss- and Gain-of-function Approach to Investigate Early Cell Fate Determinants in Preimplantation Mouse Embryos

Published on: June 6, 2016

Area of Science:

Developmental Biology
Cell Biology
Molecular Biology

Background:

Ribosome biogenesis, including ribosomal gene transcription (rDNA) and precursor rRNA (pre-rRNA) processing, is essential for cell function.
The role of ribosome biogenesis in the initial lineage differentiation of early mouse embryonic development is not well understood.
Nucleolar protein LYAR (Ly-1 antibody reactive clone) is known to promote ribosome production by regulating rDNA transcription and pre-rRNA maturation.

Purpose of the Study:

To investigate the presence and localization of LYAR during early mouse embryonic development.
To determine the impact of LYAR on the first lineage differentiation and inner cell mass (ICM) formation.
To explore the relationship between LYAR-mediated ribosome biogenesis and early embryonic development.

Main Methods:

Immunofluorescence staining to detect LYAR localization and assess lineage differentiation.
Quantitative polymerase chain reaction (qPCR) to analyze rDNA transcription and pre-rRNA processing.
Microinjection of LYAR interference fragments or mRNA into mouse embryos at pronuclear and 2-cell stages.
EU staining to measure newly synthesized rRNA levels.

Main Results:

LYAR is present throughout preimplantation development, gradually localizing to the nucleolus as development progresses.
LYAR knockdown at the pronuclear stage reduces ICM numbers after the first lineage differentiation.
Modulating LYAR expression in individual blastomeres affects their contribution to the ICM, altering blastocyst cell composition.

Conclusions:

LYAR plays a significant role in early mouse embryonic development, particularly in the first lineage differentiation.
Ribosome biogenesis, influenced by LYAR, is linked to the formation of the inner cell mass and subsequent embryonic development.
This study provides insights into the molecular mechanisms governing early mouse embryogenesis and the role of ribosome biogenesis.