Front. Genet. Frontiers in Genetics Front. Genet. 1664-8021 Frontiers Media S.A. 877443 10.3389/fgene.2022.877443 Genetics Correction Corrigendum: Parental Somatic Mosaicism Uncovers Inheritance of an Apparently De Novo GFAP Mutation Grossi et al. Corrigendum: Parental Somatic Mosaicism in Alexander Disease Grossi Alice 1 Morelli Federico 1 † Di Duca Marco 2 † Caroli Francesco 1 † Moroni Isabella 3 Tonduti Davide 4 Bachetti Tiziana 1 5 † Ceccherini Isabella 1 * 1 UOSD Laboratory of Genetics and Genomics of Rare Diseases, IRCCS Istituto Giannina Gaslini, Genoa, Italy 2 Laboratory of Molecular Nephrology, IRCCS Istituto Giannina Gaslini, Genoa, Italy 3 Department of Pediatric Neurosciences, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy 4 Unit of Pediatric Neurology - C.O.A.L.A (Center for Diagnosis and Treatment of Leukodystrophies), V. Buzzi Children’s Hospital, Milan, Italy 5 Laboratory of Developmental Neuro-Biology, DISTAV, University of Genoa, Genoa, Italy

Approved by: Frontiers Editorial Office, Frontiers Media SA, Switzerland

 *Correspondence: Isabella Ceccherini, isabellaceccherini@gaslini.org

Present address: Federico Morelli, uniQure N.V., Amsterdam, Netherlands; Marco Di Duca, UOC Genetica Medica, IRCCS Istituto Giannina Gaslini, Genova, Italy; Francesco Caroli, UOC Genetica Medica, IRCCS Istituto Giannina Gaslini, Genova, Italy; Tiziana Bachetti, UO Proteomica e Spettrometria di Massa, IRCCS Ospedale Policlinico San Martino, Genoa, Italy

This article was submitted to Neurogenomics, a section of the journal Frontiers in Genetics

 21 03 2022 2022 13 877443 16 02 2022 24 02 2022 Copyright © 2022 Grossi, Morelli, Di Duca, Caroli, Moroni, Tonduti, Bachetti and Ceccherini. 2022 Grossi, Morelli, Di Duca, Caroli, Moroni, Tonduti, Bachetti and Ceccherini

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 A Corrigendum on Parental Somatic Mosaicism Uncovers Inheritance of an Apparently De Novo GFAP Mutation by Grossi, A., Morelli, F., Di Duca, M., Caroli, F., Moroni, I., Tonduti, D., Bachetti, T., and Ceccherini, I. (2021). Front. Genet. 12:744068. doi:10.3389/fgene.2021.744068 central nervous system diseases genetic counseling human genetics DNA sequence analysis germline mosaicism somatic mosaicism GFAP gene Alexander disease

In the original article, there was an error in the Introduction section. The phrase “siblings of parents” seems to imply the aunts and uncles of the affected child, rather than the siblings of the child, as it should be. A correction has been made in the Introduction section:

Alexander disease (AxD) is an extremely rare, untreatable, and usually fatal neurodegenerative disorder (OMIM #203450), classified among leukodystrophies due to white matter deficits (Messing and Brenner, 2020). It is estimated to affect 1:2.7 million people in Japan (Yoshida et al., 2011). The disease presents at different ages of onset, with distinct symptoms and prognosis: in neonates and early childhood (type I) and later, though not restricted to adulthood (type II) (Prust et al., 2011). AxD is caused by heterozygous mutations of glial fibrillary acidic protein (GFAP) gene, which eventually lead to the formation of aggregates, also containing alphaB-crystallin, HSP27, ubiquitin, and proteasome components (Quinlan et al., 2007). To date, a broad spectrum of pathogenic GFAP variants accounts for more than 90% of patients. Mutations occur either de novo or through transmission from the parental generation. A recurrent occurrence of the same disease-causing GFAP mutation in siblings from parents who tested negative for the variant strongly suggests the presence of a germinal mosaicism (Melchionda et al., 2013) (two affected siblings were also reported by Namekawa et al. (2002), but the parents were not examined). Indirect evidence for germinal mosaicism in de novo AxD cases has also been provided by studies finding that the de novo mutations predominantly arise on the paternal chromosome (Li et al., 2006; Zang et al., 2013). Such a condition may be associated with somatic mosaicism, a circumstance nevertheless unproven so far (Messing, 2018). In the case of AxD, the risk of transmitting a GFAP mutation to a second child by germline mosaicism has been estimated as less than 1% (Messing, 2018); however, when significant somatic mosaicism is observed in a parent, the risk of recurrence could be substantially higher.

Also, a reference “Li et al., 2006” was cited but was not included in the reference section. A correction has been made to the Reference list.

The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated.

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