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marinesco-sjogren_syndrome [2023/10/19 14:42] – Scott Larsonmarinesco-sjogren_syndrome [2026/07/28 19:27] (current) – Scott Larson
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 ====== Marinesco-Sjögren Syndrome ====== ====== Marinesco-Sjögren Syndrome ======
-[[http://www.ncbi.nlm.nih.gov/books/NBK1192/?report=reader|Gene Reviews]] 
  
 +Rare autosomal recessive multisystem disorder characterized by a classic tetrad: 
 +  - Cerebellar ataxia
 +  - Early-onset cataracts
 +  - Intellectual disability
 +  - Progressive myopathy.
  
-{{tag>syndrome unfinished}}+====Main Features==== 
 + 
 +  * **Cerebellar ataxia** — present in >90% of patients, with cerebellar atrophy seen on MRI in 100% 
 +  * **Cataracts** — present in 95–100%; mean onset ~3.5 years; typically requires lens extraction in the first decade of life 
 +  * **Intellectual disability** — present in >90%; ranges from mild to severe, though normal intelligence has been reported 
 +  * **Myopathy** — myopathic changes on EMG or muscle biopsy in >90%; muscle weakness, hypotonia, and atrophy are common* 
 +  * **Hypotonia** — present in 95–100% 
 + 
 +====Eye Findings==== 
 + 
 +  * **Cataracts** — the hallmark ocular feature (95–100%); develops in early childhood and may be absent in infants, which can delay diagnosis 
 +  * **Strabismus** — present in 60–80% of affected individuals 
 +  * **Nystagmus** — observed in ~50%, likely related to cerebellar dysfunction 
 +  * **Optic atrophy** — rare; reported in a review of 75 patients 
 +  * **Glaucoma** — rare 
 +  * **Microphthalmia** — rare 
 +  * **Retinal degeneration** — rare 
 +  * **Iris coloboma** — reported as a novel finding in some patients 
 + 
 +====Other Findings==== 
 + 
 +  * **Hypergonadotropic hypogonadism** — 50–70%; delayed or absent puberty; no associated congenital genital anomalies described 
 +  * **Short stature** — 50–70%; microcephaly occasionally reported 
 +  * **Skeletal abnormalities** — ~50%; includes scoliosis, shortened metacarpals/metatarsals/phalanges, coxa valga, pes planovalgus, and pectus carinatum 
 +  * **Dysarthria** — reported in ~45% of patients 
 +  * **Pyramidal tract signs** — modestly constant feature 
 +  * **Dental abnormalities** — reported in some patients 
 +  * **Life span** — appears to be near normal despite significant disability 
 + 
 +====Etiology==== 
 + 
 +  * **Gene:** SIL1 (chromosome 5q31) 
 +  * **Protein:** SIL1 encodes BIP-associated protein (BAP), a 461-amino acid endoplasmic reticulum (ER) resident co-chaperone 
 +  * **Function:** BAP acts as a nucleotide exchange factor for the ER chaperone BiP (HSPA5/GRP78), promoting ATP–ADP exchange essential for protein folding and transport in the ER 
 +  * **Pathophysiology:** Loss-of-function mutations lead to severely reduced or absent BAP protein, resulting in impaired ER protein processing and ER stress-induced cell damage 
 +  * **Inheritance:** Autosomal recessive 
 +  * **Genetic heterogeneity:** SIL1 mutations account for ~60% of patients with the classic triad; patients without SIL1 mutations are clinically indistinguishable, suggesting additional causative genes exist 
 +  * **Founder effect:** In Japan, the SIL1 c.936dupG (p.Leu313fs) mutation was found on 43/48 chromosomes tested, with haplotype analysis suggesting a founder effect 
 + 
 +====References==== 
 + 
 +  - [[https://pubmed.ncbi.nlm.nih.gov/24176978|Krieger M, Roos A, Stendel C, et al. SIL1 Mutations and Clinical Spectrum in Patients With Marinesco-Sjogren Syndrome. Brain. 2013]] 
 +  - [[https://pubmed.ncbi.nlm.nih.gov/17296802|Fogel BL, Perlman S. Clinical Features and Molecular Genetics of Autosomal Recessive Cerebellar Ataxias. Lancet Neurol. 2007]] 
 +  - [[https://medlineplus.gov/genetics/condition/marinesco-sjogren-syndrome|National Library of Medicine (MedlinePlus). Marinesco-Sjögren syndrome. 2015]] 
 +  - [[https://www.ncbi.nlm.nih.gov/books/NBK1192|Anttonen AK. Marinesco-Sjögren Syndrome. GeneReviews. 2024]] 
 +  - [[https://pubmed.ncbi.nlm.nih.gov/23062754|Horvers M, Anttonen AK, Lehesjoki AE, et al. Marinesco-Sjögren Syndrome Due to SIL1 Mutations With a Comment on the Clinical Phenotype. Eur J Paediatr Neurol. 2013]] 
 +  - [[https://pubmed.ncbi.nlm.nih.gov/15523624|Slavotinek A, Goldman J, Weisiger K, et al. Marinesco-Sjögren syndrome in a male with mild dysmorphism. Am J Med Genet A. 2005]] 
 +  - [[https://pubmed.ncbi.nlm.nih.gov/24033328|Ezgu F, Krejci P, Li S, et al. Phenotype-genotype correlations in patients with Marinesco-Sjögren syndrome. Clin Genet. 2014]] 
 +  - [[https://pubmed.ncbi.nlm.nih.gov/24755310|Goto M, Okada M, Komaki H, et al. A Nationwide Survey on Marinesco-Sjögren Syndrome in Japan. Orphanet J Rare Dis. 2014]] 
 +  - [[http://www.ncbi.nlm.nih.gov/books/NBK1192/?report=reader|Gene Reviews]] 
 + 
 + 
 +{{tag>syndrome}}