Vijay S Ganesh, Kevin Riquin, Nicolas Chatron, Kay-Marie Lamar, Miriam C Aziz, Pauline Monin, Melanie O'Leary, Julia K Goodrich, Kiran V Garimella, Eleina England, Esther Yoon, Ben Weisburd, Francois Aguet, Carlos A Bacino, David R Murdock, Hongzheng Dai, Jill A Rosenfeld, Lisa T Emrick, Shamika Ketkar, Yael Sarusi, Damien Sanlaville, Saima Kayani, Brian Broadbent, Bertrand Isidor, Alisée Pengam, Benjamin Cogné, Daniel G MacArthur, Igor Ulitsky, Gemma L Carvill, Anne O'Donnell-Luria
Genes encoding long non-coding RNAs (lncRNAs) comprise a large fraction of the human genome, yet haploinsufficiency of a lncRNA has not been shown to cause a Mendelian disease. CHASERR is a highly conserved human lncRNA adjacent to CHD2- a coding gene in which de novo loss-of-function variants cause developmental and epileptic encephalopathy. Here we report three unrelated individuals each harboring an ultra-rare heterozygous de novo deletion in the CHASERR locus. We report similarities in severe developmental delay, facial dysmorphisms, and cerebral dysmyelination in these individuals, distinguishing them from the phenotypic spectrum of CHD2 haploinsufficiency...
February 7, 2024: medRxiv