A nonsense variant in the C-terminal transactivation domain of the EBF3 gene in an individual with intellectual disability and behavioural disorder: case report and literature review.

Heterozygous variants in the Early B cell factor 3 (EBF3) have been reported in individuals presenting with hypotonia, ataxia and delayed development syndrome (HADDS) (MIM#617330). However, individuals with pathogenic variants in EBF3 show phenotypic heterogeneity and very few variants in the C-terminal domain have been described. We report on a heterozygous de-novo variant in the EBF3 gene in an individual with neurodevelopmental delay and behavioural problems.

SMAD4 Pathogenic Variants in Seven New Brazilian Individuals With Myhre Syndrome Including a New Family.

Myhre syndrome is a rare disorder caused by pathogenic gain-of-function variants in the SMAD4 gene. Most of the patients have had de novo variants. There are several instances of autosomal dominant inheritance, and penetrance appears to be complete.

Multiple Aneuploidy: First Report of a Patient Presenting with a Karyotype 45,X/48,XXX,+21.

Introduction: The dual diagnosis of Down syndrome and Turner syndrome in the same patient was clinically identified in the early 1950s before the development of karyotyping techniques. After that, several authors reported anecdotal patients and/or reviewed series of Down-Turner double aneuploidies due to a regular 46,X,+21 constitution or different combinations of abnormal cell lines. In such cases, the most typical presentation encompasses the female sex, Down syndrome phenotype, and chromosomal mosaicism.