{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"bioRxiv"}],"indexed":{"date-parts":[[2026,6,30]],"date-time":"2026-06-30T22:49:55Z","timestamp":1782859795676,"version":"3.54.5"},"posted":{"date-parts":[[2025,1,3]]},"group-title":"Molecular Biology","reference-count":67,"publisher":"openRxiv","license":[{"start":{"date-parts":[[2025,1,3]],"date-time":"2025-01-03T00:00:00Z","timestamp":1735862400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2025,1,28]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                <jats:p>\n                  The heart employs a specialized ribosome in its muscle cells to translate genetic information into proteins, a fundamental adaptation with an elusive physiological role\n                  <jats:sup>1\u20133<\/jats:sup>\n                  . Its significance is underscored by the discovery of neonatal patients suffering from often fatal heart failure caused by severe dilated cardiomyopathy when both copies of the gene\n                  <jats:italic>RPL3L<\/jats:italic>\n                  are mutated\n                  <jats:sup>4\u20139<\/jats:sup>\n                  . RPL3L is a muscle-specific paralog\n                  <jats:sup>1\u20133<\/jats:sup>\n                  of the ubiquitous ribosomal protein L3 (RPL3), which makes the closest contact of any protein to the ribosome\u2019s RNA-based catalytic center\n                  <jats:sup>10<\/jats:sup>\n                  .\n                  <jats:italic>RPL3L<\/jats:italic>\n                  -linked heart failure represents the only known human disease associated with tissue-specific ribosomes, yet the underlying pathogenetic mechanisms remain poorly understood. Intriguingly, disease is linked to a large number of mostly missense variants in\n                  <jats:italic>RPL3L<\/jats:italic>\n                  , and\n                  <jats:italic>RPL3L<\/jats:italic>\n                  -knockout resulted in no severe heart defect in either human or mice\n                  <jats:sup>3, 11\u201313<\/jats:sup>\n                  , challenging the prevailing view that autosomal recessive diseases are caused by loss-of-function mutations. Here, we report three new cases of\n                  <jats:italic>RPL3L<\/jats:italic>\n                  -linked severe neonatal heart failure and present a unifying pathogenetic mechanism by which a large number of variants in the muscle-specific ribosome led to disease. Specifically, affected families often carry one of two recurrent toxic gain-of-function variants alongside a family-specific putative loss-of-function variant. While the non-recurrent variants often trigger partial compensation of\n                  <jats:italic>RPL3<\/jats:italic>\n                  similar to\n                  <jats:italic>Rpl3l<\/jats:italic>\n                  -knockout mice, both recurrent variants exhibit increased affinity for the RPL3\/RPL3L chaperone GRWD1\n                  <jats:sup>14\u201316<\/jats:sup>\n                  and 60S biogenesis factors, sequester 28S rRNA in the nucleus, disrupt ribosome biogenesis, and trigger severe cellular toxicity that extends beyond the loss of ribosomes. These findings provide critical insights for genetic screening and therapeutic development of neonatal heart failure. Our results suggest that gain-of-toxicity mechanisms may be more prevalent in autosomal recessive diseases, and a combination of gain-of-toxicity and loss-of-function mechanisms could underlie many diseases involving genes with paralogs.\n                <\/jats:p>","DOI":"10.1101\/2025.01.02.630345","type":"posted-content","created":{"date-parts":[[2025,1,3]],"date-time":"2025-01-03T07:20:12Z","timestamp":1735888812000},"source":"Crossref","is-referenced-by-count":4,"title":["Pathogenetic mechanisms of muscle-specific ribosomes in dilated cardiomyopathy"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0470-5791","authenticated-orcid":false,"given":"Michael R.","family":"Murphy","sequence":"first","affiliation":[{"name":"Division of Cardiology, Department of Medicine, Columbia University Irving Medical Center, New York, NY 10032, USA"},{"name":"Department of Systems Biology, Columbia University Irving Medical Center, New York, NY 10032, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mythily","family":"Ganapathi","sequence":"additional","affiliation":[{"name":"Department of Pathology and Cell Biology, Columbia University Irving Medical Center, New York, NY 10032, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Teresa M.","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Pediatrics, Columbia University Medical Center Irving Medical Center, New York, NY 10032, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joshua M.","family":"Fisher","sequence":"additional","affiliation":[{"name":"Department of Pediatrics, Columbia University Medical Center Irving Medical Center, New York, NY 10032, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Megha V.","family":"Patel","sequence":"additional","affiliation":[{"name":"Department of Pediatrics, Nicklaus Children\u2019s Hospital, Miami, FL 33155, 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C.","family":"Ahrens-Nicklas","sequence":"additional","affiliation":[{"name":"Division of Human Genetics, Children\u2019s Hospital of Philadelphia, Philadelphia, PA 19104, USA"},{"name":"Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Divya","family":"Nair","sequence":"additional","affiliation":[{"name":"Division of Human Genetics, Children\u2019s Hospital of Philadelphia, Philadelphia, PA 19104, USA"},{"name":"Division of Cardiology, Children\u2019s Hospital of Philadelphia, Philadelphia, PA 19104, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rajesh K.","family":"Soni","sequence":"additional","affiliation":[{"name":"Proteomics and Macromolecular Crystallography Shared Resource, Herbert Irving Comprehensive Cancer Center, Columbia University, New York, NY 10032, 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