PMID- 33970241 OWN - NLM STAT- MEDLINE DCOM- 20220225 LR - 20220225 IS - 1754-8411 (Electronic) IS - 1754-8403 (Print) IS - 1754-8403 (Linking) VI - 14 IP - 5 DP - 2021 May 1 TI - Autosomal recessive osteopetrosis: mechanisms and treatments. LID - 10.1242/dmm.048940 [doi] LID - dmm048940 AB - Autosomal recessive osteopetrosis (ARO) is a severe inherited bone disease characterized by defective osteoclast resorption or differentiation. Clinical manifestations include dense and brittle bones, anemia and progressive nerve compression, which hamper the quality of patients' lives and cause death in the first 10 years of age. This Review describes the pathogenesis of ARO and highlights the strengths and weaknesses of the current standard of care, namely hematopoietic stem cell transplantation (HSCT). Despite an improvement in the overall survival and outcomes of HSCT, transplant-related morbidity and the pre-existence of neurological symptoms significantly limit the success of HSCT, while the availability of human leukocyte antigen (HLA)-matched donors still remains an open issue. Novel therapeutic approaches are needed for ARO patients, especially for those that cannot benefit from HSCT. Here, we review preclinical and proof-of-concept studies, such as gene therapy, systematic administration of deficient protein, in utero HSCT and gene editing. CI - (c) 2021. Published by The Company of Biologists Ltd. FAU - Penna, Sara AU - Penna S AUID- ORCID: 0000-0002-5036-3809 AD - San Raffaele Telethon Institute for Gene Therapy (SR-Tiget), IRCCS San Raffaele Scientific Institute, Milan 20132, Italy. AD - Translational and Molecular Medicine (DIMET), University of Milano-Bicocca, Monza 20900, Italy. FAU - Villa, Anna AU - Villa A AUID- ORCID: 0000-0003-4428-9013 AD - San Raffaele Telethon Institute for Gene Therapy (SR-Tiget), IRCCS San Raffaele Scientific Institute, Milan 20132, Italy. AD - Institute of Genetic and Biomedical Research, Milan Unit, National Research Council, Milan 20090, Italy. FAU - Capo, Valentina AU - Capo V AUID- ORCID: 0000-0002-1851-1429 AD - San Raffaele Telethon Institute for Gene Therapy (SR-Tiget), IRCCS San Raffaele Scientific Institute, Milan 20132, Italy. AD - Institute of Genetic and Biomedical Research, Milan Unit, National Research Council, Milan 20090, Italy. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review DEP - 20210510 PL - England TA - Dis Model Mech JT - Disease models & mechanisms JID - 101483332 SB - IM MH - Consensus MH - Gene Expression Regulation MH - Genes, Recessive MH - Humans MH - Osteoclasts/metabolism/pathology MH - Osteopetrosis/*genetics/pathology/*therapy MH - Practice Guidelines as Topic PMC - PMC8188884 OTO - NOTNLM OT - Bone disease OT - Gene therapy OT - Hematopoietic stem cell transplantation OT - Osteoclast OT - Osteopetrosis COIS- Competing interests The authors declare no competing or financial interests. EDAT- 2021/05/11 06:00 MHDA- 2022/02/26 06:00 PMCR- 2021/05/10 CRDT- 2021/05/10 12:27 PHST- 2021/05/10 12:27 [entrez] PHST- 2021/05/11 06:00 [pubmed] PHST- 2022/02/26 06:00 [medline] PHST- 2021/05/10 00:00 [pmc-release] AID - 261835 [pii] AID - DMM048940 [pii] AID - 10.1242/dmm.048940 [doi] PST - ppublish SO - Dis Model Mech. 2021 May 1;14(5):dmm048940. doi: 10.1242/dmm.048940. Epub 2021 May 10.