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Genetic control over biogenic crystal morphogenesis in zebrafish.

Rachael Deis¹, Tali Lerer-Goldshtein¹, Olha Baiko¹

¹Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel.

Nature Chemical Biology

|August 30, 2024

Summary

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Zebrafish iridophores control intracellular crystal shape by genetically regulating the ratio of guanine and hypoxanthine. This mechanism explains the diversity of biogenic crystals and inspires new biomaterials.

Area of Science:

Biochemistry
Developmental Biology
Materials Science

Background:

Organisms utilize biogenic crystals for diverse functions like vision and camouflage.
The precise mechanisms governing the formation and diversity of intracellular crystals are not fully understood.

Purpose of the Study:

To elucidate the biochemical control over crystal morphogenesis in zebrafish iridophores.
To identify the genetic and compositional factors influencing crystal shape.

Main Methods:

Analysis of crystal chemical composition in zebrafish iridophores.
Investigation of genetic control through tissue-specific gene expression.
Examination of substrate selectivity of specialized paralogs.

Main Results:

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Crystal shape is determined by chemical composition, specifically the ratio of guanine to hypoxanthine.
Genetic control via tissue-specific expression of paralogs with high substrate selectivity dictates composition.
This leads to a wide spectrum of crystal morphologies.

Conclusions:

A biochemical mechanism for generating diverse biogenic crystal morphologies is revealed.
Findings suggest a model for the functional diversity of biogenic crystals.
Potential applications in developing genetically designed biomaterials and therapeutics.