Investigación sobre el Síndrome ReNU

Summary: Groundbreaking discovery: biallelic (recessive) variants in RNU4-2 cause a second neurodevelopmental syndrome, distinct from dominant ReNU, with distinct white matter changes. The study identifies 38 individuals with homozygous or compound heterozygous variants in RNU4-2, greatly expanding the disease spectrum linked to this gene.

Summary: Saturation editing study of RNU4-2 revealing two distinct disorders: one dominant (ReNU) and one recessive. Systematically maps functional consequences of every possible variant in the spliceosomal snRNA, identifying critical positions and providing molecular basis to distinguish and understand both syndromes.

Summary: Systematic analysis of snRNA genes revealing frequent RNU2-2 variants in dominant and recessive developmental and epileptic encephalopathies. The study broadens understanding of snRNA roles in rare neurological diseases and opens new diagnostic perspectives for undiagnosed patients.

Summary: Italian study — with participation of Dr. Donatella Milani, President of the Scientific Committee of Sindrome ReNU Italia — describing longitudinal behavioral traits of RNU4-2 Syndrome. Characteristic behaviors are identified with implications for clinical management: happy mood, seeking physical contact, brief agitation episodes. One of the first longitudinal studies on the behavioral phenotype.

Summary: Summary of the inaugural ReNU Hope Conference (July 2025, New York), bringing together researchers, families, clinicians and therapy developers worldwide. Key themes: advances in RNU4-2 research, new diagnostic approaches, therapy development, family support and international patient registry creation.

Summary: Japanese study analyzing monoallelic and biallelic RNU4-2 variants in a cohort of unresolved neurodevelopmental disorder cases. Confirms prevalence of de novo variants in the critical T-loop region, characterizes the mutational spectrum and provides epidemiological data on Asian populations, contributing to global understanding of the syndrome.

Summary: First study on prenatal evaluation of RNU4-2 variants in fetuses with central nervous system anomalies. Congenital brain anomalies are among the most common malformations but prenatal genetic diagnostic yield remains below 40%. This study demonstrates the value of RNU4-2 sequencing in prenatal diagnosis of brain anomalies, paving the way for earlier diagnoses.

Summary: The landmark study that discovered ReNU Syndrome. Analyzing 47,606 individuals across 34 international cohorts, authors identified de novo variants in RNU4-2 as the cause of a frequent neurodevelopmental syndrome. Estimated prevalence ~1:35,000 live births. The syndrome — named ReNU — includes severe psychomotor delay, hypotonia, epilepsy, microcephaly, facial dysmorphisms and structural brain anomalies.

Summary: Study characterizing in detail the RNU4-2-related neurodevelopmental disorder with focus on severe intellectual disability. Includes analysis of global developmental delay, epilepsy, microcephaly, short stature and hypotonia. Contributes to defining clinical diagnostic criteria and stratifying patients by phenotype severity, with implications for management and support.