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The Liberfarb syndrome, a multisystem disorder affecting eye, ear, bone, and brain development, is caused by a founder pathogenic variant in the PISD gene

Peter, Virginie G. and Quinodoz, Mathieu and Pinto-Basto, Jorge and Sousa, Sergio B. and Di Gioia, Silvio Alessandro and Soares, Gabriela and Ferraz Leal, Gabriela and Silva, Eduardo D. and Pescini Gobert, Rosanna and Miyake, Noriko and Matsumoto, Naomichi and Engle, Elizabeth C. and Unger, Sheila and Shapiro, Frederic and Superti-Furga, Andrea and Rivolta, Carlo and Campos-Xavier, Belinda. (2019) The Liberfarb syndrome, a multisystem disorder affecting eye, ear, bone, and brain development, is caused by a founder pathogenic variant in the PISD gene. Genetics in medicine, 21 (12). pp. 2734-2743.

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Abstract

We observed four individuals in two unrelated but consanguineous families from Portugal and Brazil affected by early-onset retinal degeneration, sensorineural hearing loss, microcephaly, intellectual disability, and skeletal dysplasia with scoliosis and short stature. The phenotype precisely matched that of an individual of Azorean descent published in 1986 by Liberfarb and coworkers.; Patients underwent specialized clinical examinations (including ophthalmological, audiological, orthopedic, radiological, and developmental assessment). Exome and targeted sequencing was performed on selected individuals. Minigene constructs were assessed by quantitative polymerase chain reaction (qPCR) and Sanger sequencing.; Affected individuals shared a 3.36-Mb region of autozygosity on chromosome 22q12.2, including a 10-bp deletion (NM_014338.3:c.904-12_904-3delCTATCACCAC), immediately upstream of the last exon of the PISD (phosphatidylserine decarboxylase) gene. Sequencing of PISD from paraffin-embedded tissue from the 1986 case revealed the identical homozygous variant. In HEK293T cells, this variant led to aberrant splicing of PISD transcripts.; We have identified the genetic etiology of the Liberfarb syndrome, affecting brain, eye, ear, bone, and connective tissue. Our work documents the migration of a rare Portuguese founder variant to two continents and highlights the link between phospholipid metabolism and bone formation, sensory defects, and cerebral development, while raising the possibility of therapeutic phospholipid replacement.
Faculties and Departments:03 Faculty of Medicine
09 Associated Institutions > Institute of Molecular and Clinical Ophthalmology Basel (IOB)
09 Associated Institutions > Institute of Molecular and Clinical Ophthalmology Basel (IOB) > Research Group Rivolta IOB
UniBasel Contributors:Rivolta, Carlo
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Nature Publishing Group
ISSN:1530-0366
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
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Last Modified:28 Dec 2020 08:49
Deposited On:22 Dec 2020 07:58

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