Fruit Fly Heart Platform Pinpoints Best Segment for Modeling Cardiomyopathy

Researchers have built a standardized framework for measuring heart function in fruit flies, and used it to create precise laboratory models of two major human heart muscle diseases. The platform, described in Cell & Bioscience, is called Segmental Cardiac Output and Performance Evaluation, or SCOPE, and it integrates established cardiac imaging approaches into a single quantitative system for studying the fly heart segment by segment.

Cardiomyopathies are major causes of heart failure and sudden cardiac death, yet the functional consequences of many disease-associated genes and variants remain poorly defined. The team behind the new work argues that a scalable in vivo system for quantitative cardiac phenotyping could help close that gap by allowing systematic functional testing of candidate genes and variants in a living animal.

To establish a reliable measurement site, the researchers systematically compared cardiac function across the abdominal segments of the Drosophila heart. This analysis identified segment A3 as the dominant pumping region. Segment A3 showed the largest systolic and diastolic diameters, the highest fractional shortening, and the greatest cardiac output of any segment examined, making it an optimal and reproducible site for functional assessment.

With that benchmark in place, the team generated genetically defined models of the two cardiomyopathy subtypes by silencing specific genes in the fly heart.

Silencing LamC produced hallmark features of dilated cardiomyopathy. The flies developed chamber dilation, lost cardiomyocytes, showed reduced contractility, and had decreased cardiac output. These structural and functional changes mirror the core characteristics of the dilated form of the disease in human patients.

Silencing bt, by contrast, induced hypertrophic remodeling. The affected flies showed increased heart wall thickness together with impaired cardiac performance, recapitulating key features of hypertrophic cardiomyopathy. According to the authors, the two models together capture the defining structural and functional signatures of the human disease subtypes they are meant to represent.

The work positions the fly as a practical system for precision modeling of cardiomyopathy subtypes. Because the platform is segment-resolved and standardized, the researchers say it can support precise disease modeling, systematic functional validation of candidate genes and variants, and future screens for genetic and pharmacologic modifiers of heart function.

The study is published as peer-reviewed, accepted research shared early for faster access, carrying a permanent DOI ahead of the final version of record.

Subject of Research: A segment-based Drosophila platform for quantitative cardiac phenotyping and modeling of dilated and hypertrophic cardiomyopathy

Article Title: A scalable segment-based in vivo platform for precision modeling of dilated and hypertrophic cardiomyopathies in Drosophila

Article References: Zhu, J.-Y., Seah, H., Lee, H., & Han, Z. (2026). A scalable segment-based in vivo platform for precision modeling of dilated and hypertrophic cardiomyopathies in Drosophila. Cell & Bioscience. https://doi.org/10.1186/s13578-026-01650-8

Image Credits: AI Generated

DOI: 10.1186/s13578-026-01650-8

Keywords: Drosophila, cardiomyopathy, SCOPE, LMNA, MYBPC3, cardiac output, dilated cardiomyopathy, hypertrophic cardiomyopathy, heart segments, in vivo modeling, Cell & Bioscience, scalable