1. Lunapark deficiency leads to an autosomal recessive neurodevelopmental phenotype with a degenerative course, epilepsy and distinct brain anomalies
- Author
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Accogli, Andrea, Zaki, Maha S, Al-Owain, Mohammed, Otaif, Mansour Y, Jackson, Adam, Argilli, Emanuela, Chandler, Kate E, De Goede, Christian GEL, Cora, Tülün, Alvi, Javeria Raza, Eslahi, Atieh, Asl Mohajeri, Mahsa Sadat, Ashtiani, Setareh, Au, PY Billie, Scocchia, Alicia, Alakurtti, Kirsi, Pagnamenta, Alistair T, Toosi, Mehran Beiraghi, Ghayoor Karimiani, Ehsan, Mojarrad, Majid, Arab, Fatemeh, Duymuş, Fahrettin, Scantlebury, Morris H, Yeşil, Gözde, Rosenfeld, Jill Anne, Türkyılmaz, Ayberk, Sağer, Safiye Güneş, Sultan, Tipu, Ashrafzadeh, Farah, Zahra, Tatheer, Rahman, Fatima, Maqbool, Shazia, Abdel-Hamid, Mohamed S, Issa, Mahmoud, Efthymiou, Stephanie, Bauer, Peter, Zifarelli, Giovanni, Salpietro, Vincenzo, Al-Hassnan, Zuhair, Banka, Siddharth, Sherr, Elliot H, Gleeson, Joseph G, Striano, Pasquale, Houlden, Henry, Severino, Mariasavina, and Maroofian, Reza
- Subjects
Pediatric ,Neurosciences ,Genetics ,Neurodegenerative ,Clinical Research ,Congenital Structural Anomalies ,Brain Disorders ,Rare Diseases ,Human Genome ,Epilepsy ,2.1 Biological and endogenous factors ,Aetiology ,Mental health ,Neurological ,Clinical sciences ,Biological psychology - Abstract
Abstract: LNPK encodes a conserved membrane protein that stabilizes the junctions of the tubular endoplasmic reticulum network playing crucial roles in diverse biological functions. Recently, homozygous variants in LNPK were shown to cause a neurodevelopmental disorder (OMIM#618090) in four patients displaying developmental delay, epilepsy, and non-specific brain malformations including corpus callosum hypoplasia and variable impairment of cerebellum. We sought to delineate the molecular and phenotypic spectrum of LNPK-related disorder. Exome or genome sequencing was carried out in eleven families. Thorough clinical and neuroradiological evaluation was performed for all the affected individuals, including review of previously reported patients. We identified twelve distinct homozygous loss-of-function variants in sixteen individuals presenting with moderate to profound developmental delay, cognitive impairment, regression, refractory epilepsy and a recognizable neuroimaging pattern consisting of corpus callosum hypoplasia and signal alterations of the forceps minor (“ear-of-the-lynx” sign), variably associated with substantia nigra signal alterations, mild brain atrophy, short midbrain, and cerebellar hypoplasia/atrophy. In summary, we define the core phenotype of LNPK-related disorder and expand the list of neurological disorders presenting with the “ear of the lynx” sign suggesting a possible common underlying mechanism related to endoplasmic reticulum-phagy dysfunction.
- Published
- 2023