Skeletal dysplasia

Gene: DDX41

Red List (low evidence)

1 patient with acromesomelic dysplasia (short stature, premature closure of epiphyses of hands/feet), chronic ichthyotic-like skin changes, joint pain, facial dysmorphism, dental crowding, difficulty in swallowing, hyperinsulinism, and absent breast development.. WES identified compound heterozygous DDX41 variants (p.Met155Ile and p.Glu345Lys). Parents confirmed carriers of single variant.

DDX41 (DEAD‑box helicase 41) is a member of the largest family of RNA helicases. The DEAD-box RNA helicases regulate all aspects of RNA metabolism. DDX41 acts as a sensor of viral DNA and activates the STING-TBK1-IRF3-type I IFN signaling pathway. Functional analyses of the patient-derived dermal fibroblasts revealed a reduced abundance of DDX41 and abrogated activation of the IFN genes through the STING-type I interferon pathway. Genome-wide transcriptome analyses in the patient's fibroblasts revealed significant gene dysregulation and changes in the RNA splicing events. The patient's fibroblasts also displayed upregulation of periostin mRNA expression. Using an RNA binding protein assay, they identified DDX41 as a novel regulator of periostin expression.
Sources: Literature

Created: 27 Oct 2024, 9:41 p.m.

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
Bone dysplasia, ichthyosis, and dysmorphism

Publications

• PMID: 39453476