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Updated: Nov 23, 2025

Zebrafish Whole Mount High-Resolution Double Fluorescent In Situ Hybridization

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Published on: March 25, 2009

Ythdf m⁶A Readers Function Redundantly during Zebrafish Development.

Cassandra Kontur¹, Minsun Jeong², Daniel Cifuentes³

¹Department of Genetics, Yale University School of Medicine, New Haven, CT 06510, USA.

|December 30, 2020

Summary

This summary is machine-generated.

N6-methyladenosine (m6A) promotes maternal mRNA deadenylation during the maternal-to-zygotic transition. Redundant m6A readers and microRNA pathways cooperate to regulate maternal transcript clearance and developmental timing.

Keywords:

RNA modifications YTHDF readers deadenylation embryonic development m(6)A RNA methylation mRNA decay maternal transcript clearance maternal-to-zygotic transition zebrafish

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Area of Science:

Developmental Biology
RNA Biology
Molecular Genetics

Background:

The maternal-to-zygotic transition (MZT) requires precise control of maternal mRNA decay.
N6-methyladenosine (m6A) modification is implicated in mRNA decay, but its role in maternal transcript degradation is not fully understood.

Purpose of the Study:

To investigate the role of m6A in maternal mRNA deadenylation and clearance during MZT.
To elucidate the function of m6A readers (Ythdf2, Ythdf3) and their redundancy in zebrafish development.
To understand the interplay between m6A and microRNA pathways in regulating maternal mRNA stability.

Main Methods:

Utilized zebrafish as a model organism.
Generated genetic mutants for m6A readers (Ythdf2, Ythdf3).
Assessed maternal mRNA clearance, zygotic genome activation, and developmental progression.
Analyzed the impact of m6A and microRNA (miR-430) on common transcript targets.

Main Results:

m6A modification promotes maternal mRNA deadenylation.
Loss of Ythdf2 and Ythdf3 individually did not affect global maternal mRNA clearance or early development.
Ythdf proteins exhibit functional redundancy; double mutants impaired oogenesis, and triple mutants were lethal.
MicroRNA miR-430 acts additively with m6A to degrade shared transcript targets.

Conclusions:

m6A facilitates maternal mRNA deadenylation, contributing to maternal transcript clearance.
Multiple m6A readers function redundantly, and cooperate with microRNA pathways, to ensure proper RNA stability regulation during MZT.
These findings challenge the sole critical role of Ythdf2 in developmental timing and highlight a complex regulatory network for maternal mRNA metabolism.