DDX41 Gene Variants Linked to Severe Retinal Dystrophy

Researchers have identified a direct link between biallelic germline variants in the DDX41 gene and a previously unrecognized form of early-onset severe retinal dystrophy. Published in Genome Medicine, the study demonstrates that disruptions in this gene, which is primarily known for its role in hematologic malignancy predisposition, cause significant visual dysfunction through the dysregulation of retinal homeostasis. This finding expands the clinical spectrum of DDX41-related disease beyond blood disorders, indicating that individuals carrying two pathogenic variants may present with severe visual impairment at an early age.

The DDX41 gene encodes a DEAD-box ATPase RNA helicase, a protein essential for critical cellular processes including RNA splicing, innate immune signaling, and hematopoiesis. While monoallelic germline variants in DDX41 are recognized as the most common inherited predisposition to adult-onset myeloid malignancies, their potential role in retinal disorders had remained unexplored until now. The study addresses this gap by investigating the molecular and physiological consequences of biallelic loss of function in the retina, providing a mechanistic basis for the observed clinical phenotype.

Using next-generation sequencing, the research team identified nine distinct germline DDX41 variants in biallelic combinations across ten families with inherited retinal disease. This cohort included one family previously reported by Diness et al. in 2018, in whom retinal involvement had not been recognized at the time.

To understand the cellular impact of these mutations, the researchers analyzed patient fibroblasts homozygous for the missense variant c.1187T > C (p.I396T) and Ddx41I396T/I396T mouse retinas. Electroretinography further demonstrated early and severe visual dysfunction in these models, establishing a direct requirement for DDX41 in maintaining normal retinal physiology and visual function.

Subcellular localization studies revealed that DDX41 is present in the nuclei of all major retinal cell types and specifically localized to photoreceptor synapses. Biochemical assays showed that the disease-associated variants disrupted RNA binding through misfolding and aggregation, leading to a loss of function.

Transcriptomic and proteomic profiling of mutant retinas provided a detailed map of the dysregulated pathways. The analysis revealed significant disruptions in pathways involved in photoreceptor maintenance, RNA processing, immune signaling, and adherens junctions.

Retinal interactome analysis further characterized DDX41-associated protein networks, showing enrichment in synaptic function, RNA processing, and membrane trafficking pathways. The study underscores the essential role of RNA helicases in neural tissue integrity, highlighting that disruption of DDX41 impairs retinal homeostasis and visual function through multiple interconnected mechanisms.

These findings identify DDX41 deficiency as a previously unrecognized cause of early-onset severe retinal dystrophy.

Subject of Research: Genetic basis of retinal dystrophy associated with DDX41 variants

Article Title: Biallelic germline variants in the hematologic malignancy predisposition gene DDX41 cause retinal dystrophy through dysregulation of retinal homeostasis

Article References: Mars, Z., Zanetti, A., Kaminska, K., Miyagawa, T., Liu, D., Antonio, A., Arno, G., Audo, I., Ayuso, C., Hussain, H. M. J., Bao, X., Barberán-Martínez, P., Bocquet, B., Boguszewska-Chachulska, A., Condroyer, C., David, P., Dollfus, H., Fares-Taie, L., Fernández-Caballero, L., … Perrault, I. (2026). Biallelic germline variants in the hematologic malignancy predisposition gene DDX41 cause retinal dystrophy through dysregulation of retinal homeostasis. Genome Medicine. https://doi.org/10.1186/s13073-026-01824-6

Image Credits: AI Generated

DOI: 10.1186/s13073-026-01824-6

Keywords: DDX41, Retinal Dystrophy, Genetics, Ophthalmology, RNA Helicase, Genome Medicine, Inherited Disease, Molecular Biology, Biallelic, germline, variants, hematologic