<scp><i>GGPS1</i></scp>‐associated muscular dystrophy with and without hearing loss
Rauan Kaiyrzhanov, Luke Perry, Clarissa Rocca, Maha S. Zaki, Heba Hosny, Cristiane Araújo Martins Moreno, Rahul Phadke, Irina Zaharieva, Clara Camelo Gontijo, Christian Beetz, Veronica Pini, Mojtaba Movahedinia, Edmar Zanoteli, Stephanie DiTroia, Sandrine Vuillaumier‐Barrot, Arnaud Isapof, Mohammad Yahya Vahidi Mehrjardi, Nasrin Ghasemi, Anna Sárközy, Francesco Muntoni, Sandra Whalen, Barbara Vona, Henry Houlden, Reza Maroofian
Abstract
Ultra-rare biallelic pathogenic variants in geranylgeranyl diphosphate synthase 1 (GGPS1) have recently been associated with muscular dystrophy/hearing loss/ovarian insufficiency syndrome. Here, we describe 11 affected individuals from four unpublished families with ultra-rare missense variants in GGPS1 and provide follow-up details from a previously reported family. Our cohort replicated most of the previously described clinical features of GGPS1 deficiency; however, hearing loss was present in only 46% of the individuals. This report consolidates the disease-causing role of biallelic variants in GGPS1 and demonstrates that hearing loss and ovarian insufficiency might be a variable feature of the GGPS1-associated muscular dystrophy.