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How rice plants tell head from toe during early growth

A team of scientists from Tokyo Metropolitan University discovered how fertilized rice seeds begin to divide and establish their body axis. They found that the process involves radical steps different from Arabidopsis, with cells acting collectively to allow axis development despite apparent randomness.

Hitting reset to start a new embryo

Researchers identified OBOX genes as master regulators of zygote genome activation, enabling the newly formed embryo to develop according to its own genetic program. The study found that these genes facilitate Pol II locating to the correct genes, allowing for the activation of transcription factors and subsequent development.

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Errors at the start of life

Scientists discovered that errors often occur when genetic material from each parent combines immediately after fertilization, leading to incorrect numbers of chromosomes. This process is surprisingly inefficient and can result in developmental defects and miscarriage.

Challenging the totipotency of a zygote

Researchers propose a revised alternative model of mammalian cellular totipotency, highlighting the distinction between genetic and epigenetic aspects. The study's findings suggest that while zygotes are genetically totipotent, they lack epigenetic totipotency and can reprogram to a totipotent state.

Spatial DNA organization forms first, then the rest

Researchers discovered that DNA in early zygote is organized into Lamina Associated Domains (LADs) before gene activation, revealing a fundamental mechanism behind cell type identity. This discovery provides new insights into the development of an entire organism from a single fertilized oocyte.

Cell polarity -- an aurora over the pole

Researchers identify Aurora-A kinase as the master switch that triggers symmetry breaking and establishes cell polarity in nematode worm zygotes. The protein regulates actomyosin contractions, creating a two-stage process to establish front-rear asymmetry and lock polarity regulators in place.

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A molecular rivet for long-range force transmission

Researchers discovered that plastin, an actin-bundling protein, plays a crucial role in facilitating polarisation and cytokinesis in embryonic cells. The study revealed that plastin functions as a molecular rivet, enabling the cell cortex to withstand forces generated during filament contraction.

Maternal and paternal cooperation

A study by Prof. Dr. Thomas Laux and colleagues reveals that plants employ an intracellular signal pathway activated by sperm to activate gene transcription in zygotes. This collaboration between paternal and maternal factors enables the regulation of embryogenesis in plants, challenging the traditional parental conflict theory.

Plant's parent genes cooperate in shaping their child

Researchers at Nagoya University have discovered how plant parent genes cooperate to develop their offspring. The study shows that maternal and paternal factors work together to control the asymmetric division of the zygote, leading to the formation of roots or leaves.

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The earliest stages of embryogenesis have been studied

Researchers developed a new technique to study three-dimensional genome organization in individual cells, revealing differences between maternal and paternal genomes. The study provides insights into the earliest stages of embryogenesis and may help understand totipotency and reprogramming of somatic cells.

Live cell imaging of asymmetric cell division in fertilized plant cells

Researchers at Nagoya University have successfully visualized asymmetric cell division in fertilized plant cells using live cell imaging. The study reveals how the direction of this division determines the body axis of flowering plants, with a small cell forming on top and a large cell at the bottom.

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Reproduction without fertilization?

Researchers have identified a key molecular cue regulating zygotic genome activation in green algae Chlamydomonas. The abnormal expression of the mt+ gamete-specific gene gsp1 induces zygote development without fertilization. This finding opens up new avenues for understanding zygotic genome activation in higher organisms.