It is shown that independent patient-derived mutations impair splicing of SMARCAD1-s, the skin-specific short isoform of the ATP-dependent chromatin remodeller SMARCAD1, resulting in intron retention, providing evidence for a threshold-dependent haploinsufficiency model of disease.
A homozygous synonymous NPR2 variant is identified in an individual with AMDM and aberrant splicing induced by a synonymous variant as a disease-causing mechanism affecting a core developmental signaling pathway is established.
N. B. Acikgoz, Hasan Basri Kılıç, Gizem Urel Demir et al.· Differentiation; research in...· 0 citations
ASXL3 patient truncations in neurodevelopmental condition Bainbridge-Ropers syndrome are shown to mediates gain-of-function (GOF) by escaping nonsense-mediated decay and Cullin 4-dependent degradation, resulting in aberrant protein accumulation, widespread transcriptional dysregulation, and altered chromatin accessibility.
Y. Nakamura, T. Nguyen, N. Mor et al.· medRxiv· 0 citations
The discovery of a family with six affected members carrying a heterozygous loss- of-function variant in INTS6 highlights the critical role of INTS6 in transcriptional regulation of human neurodevelopment and reinforces its association with NDDs.
Nelli Jalkanen, K. Trontti, Antto J. Norppa et al.· bioRxiv· 0 citations
It is demonstrated that FMRP deficiency drives the aberrant translational upregulation of core m6A writers, a causal relationship definitively validated using CGG-corrected isogenic control lines and suggest a promising avenue for m6A-targeted therapies.
Lu Lu, Avijite Kumer Sarkar, Lan Dao et al.· Molecular Psychiatry· 0 citations
Functional modelling in zebrafish confirms a loss‑of-function mechanism and highlights species‑dependent differences specifically in the impact of the missense variant on protein function, and provides a cautionary tale about overreliance on animal models as a screening tool for variant classification.
H. Shamseldin, Dana Marafi, Mohammed A Al-Muhaizea et al.· Scientific Reports· 0 citations
The Tbx1 gene is haploinsufficient in mice and in humans, where it causes a DiGeorge syndrome phenotype characterized by developmental deficits of the pharyngeal apparatus. TBX1 plays a critical role in the differentiation and regionalization of the cardiopharyngeal mesoderm lineage and its derivatives. Nevertheless, its regulation is incompletely understood. Here we used a combination of computational and wet-lab approaches to identify regulatory sequences of the Tbx1 gene, and we use single-cell molecular analysis as a read-out and to establish the consequences of their deletion. Results revealed a cluster of regulatory sequences with at least three distinct elements. Elimination of the entire cluster caused a near shut down of the gene, while individual deletions had milder, quantitative effects. Transcriptomic analyses of the deletion mutants revealed the down regulation of genes related to cardiopharyngeal lineage specification and, more surprisingly, up regulation and anteriorization of genes related to embryonic patterning, thereby providing a rationale for the severe dysmorphogenesis of the posterior pharyngeal apparatus observed in Tbx1 mutant mice.
S. Allegretti, O. Lanzetta, M. Bilio et al.· bioRxiv· 0 citations
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