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Geometric Morphometrics on Gene Expression Patterns Within Phenotypes: A Case Example on Limb Development.

Neus Martínez-Abadías1, Roger Mateu1, Martina Niksic1

  • 1EMBL-CRG Systems Biology Program, Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader 88, 08003 Barcelona, Spain; Universitat Pompeu Fabra (UPF), Barcelona, Spain;

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Summary
This summary is machine-generated.

This study introduces a new method combining molecular biology and shape analysis to link gene expression changes to limb morphology development. The findings reveal distinct gene expression patterns for Hoxa11 and Hoxa13, impacting limb bud shape differently.

Keywords:
Elliptical Fourier analysisHoxa genesProcrustes-based semilandmarkgene domainlimb morphogenesiswhole-mount in situ hybridization

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Area of Science:

  • Developmental Biology
  • Evolutionary Biology
  • Morphometrics

Background:

  • Understanding the genotype-phenotype map is crucial for evolutionary studies.
  • Linking gene expression dynamics to morphological changes during development remains a challenge.

Purpose of the Study:

  • To develop and validate a novel approach for assessing the association between gene expression patterns and morphological changes.
  • To analyze the spatiotemporal dynamics of gene expression domains and their covariation with limb bud shape.

Main Methods:

  • Integration of whole-mount in situ hybridization with Geometric Morphometrics (Elliptical Fourier and Procrustes analyses).
  • Development of a multiple thresholding method for semiautomatic segmentation of gene expression domains.
  • Analysis of limb bud shape and gene expression patterns (Hoxa11, Hoxa13) in mouse embryos.

Main Results:

  • The morphometric approach accurately quantifies spatiotemporal gene expression dynamics.
  • Distinct, non-random, and gene-specific variation in Hoxa11 and Hoxa13 expression patterns was observed.
  • These genes show different dynamic patterns and associate differently with limb bud shape, despite paralogy.

Conclusions:

  • The developed morphometric approach is a powerful tool for studying developmental processes regulating morphogenesis.
  • This method advances understanding of the genotype-phenotype map, particularly in systems with limited molecular data.
  • The findings provide insights into how evolutionary changes in developmental patterns generate morphological diversity.