IBIDS syndrome

IBIDS syndrome, also known as Tay syndrome or trichothiodystrophy with ichthyosis, is a rare autosomal recessive disorder belonging to the trichothiodystrophy (TTD) spectrum. The acronym IBIDS stands for Ichthyosis, Brittle hair, Impaired intelligence, Decreased fertility, and Short stature, which represent the cardinal features of the condition. It is caused by mutations in genes involved in nucleotide excision repair and transcription, most commonly the ERCC2 (XPD) gene, and less frequently ERCC3 (XPB) or GTF2H5 (TTDA). These genes encode components of the TFIIH transcription/repair complex, and their dysfunction leads to defective DNA repair and transcriptional abnormalities. The condition affects multiple body systems. The hair is characteristically brittle, sparse, and sulfur-deficient, showing a distinctive 'tiger tail' pattern under polarized light microscopy due to alternating light and dark bands. The skin manifests congenital ichthyosis (fish-scale-like dry skin), and patients may also have nail dystrophy. Neurological involvement includes intellectual disability of variable severity, and affected individuals typically exhibit short stature and decreased fertility. Unlike the related PIBIDS variant, classic IBIDS syndrome does not include photosensitivity, though some overlap exists within the TTD spectrum. There is currently no cure for IBIDS syndrome. Management is supportive and multidisciplinary, focusing on symptomatic treatment of ichthyosis with emollients and keratolytic agents, developmental support and special education for intellectual disability, and monitoring of growth. Genetic counseling is recommended for affected families. Prognosis varies depending on the severity of neurological and systemic involvement, and some patients may have a reduced lifespan due to recurrent infections or other complications.

Common questions about IBIDS syndrome