Medico-Salsench E, Kaya N, Barakat TS. YIF1B-Related Neurodevelopmental Disorder. 2024 Sep 12. In: Adam MP, Bick S, Mirzaa GM, Pagon RA, Wallace SE, Amemiya A, editors. GeneReviews® [Internet]. Seattle (WA): University of Washington, Seattle; 1993–2026. PMID: 39265055.
Excerpt
Clinical characteristics: YIF1B-related neurodevelopmental disorder (YIF1B-NDD) is characterized by severe-to-profound developmental delay / intellectual disability with variable motor abnormalities including axial hypotonia, peripheral hypertonia, dystonia, and dyskinesia; absence of speech in most individuals or very limited speech subject to regression; feeding difficulties; seizures; postnatal microcephaly with nonspecific brain MRI abnormalities; and ophthalmologic involvement (strabismus, nystagmus, optic atrophy, and cortical blindness). Some individuals have hypoventilation.
Diagnosis/testing: The diagnosis of YIF1B-NDD is established in a proband with suggestive findings and biallelic pathogenic variants in YIF1B identified by molecular genetic testing.
Management: Treatment of manifestations: Developmental and educational support; feeding therapy; gastrostomy tube placement if required for persistent feeding issues; standardized treatments for movement disorder and seizures by an experienced neurologist; treatment per ophthalmologist for refractive errors and strabismus; low vision services as needed; consider ventilation therapy when hypoventilation becomes evident; social work and family support.
Surveillance: Monitor developmental progress, educational needs, growth, nutritional status, safety of oral intake, and changes in seizures at each visit; assess for any new manifestations including seizures, changes in tone, movement disorders, or manifestations of central hypoventilation at each visit; ophthalmology evaluation per treating ophthalmologist; behavioral assessment annually.
Genetic counseling: YIF1B-NDD is inherited in an autosomal recessive manner. If both parents are known to be heterozygous for a YIF1B pathogenic variant, each sib of an affected individual has at conception a 25% chance of being affected, a 50% chance of being an asymptomatic carrier, and a 25% chance of being unaffected and not a carrier. Once the YIF1B pathogenic variants have been identified in an affected family member, carrier testing for at-risk relatives and prenatal/preimplantation genetic testing are possible.
Medico Salsench E, Maroofian R, Deng R, Lanko K, Nikoncuk A, Pérez B, Sánchez-Lijarcio O, Ibáñez-Mico S, Wojcik A, Vargas M, Abbas Al-Sannaa N, Girgis MY, Silveira TRD, Bauer P, Schroeder A, Fong CT, Begtrup A, Babaei M, Toosi MB, Ashrafzadeh F, Imannezhad S, Doosti M, Ahangari N, Najarzadeh Torbati P, Ghayoor Karimiani E, Murphy D, Cali E, Kaya IH, AlMuhaizea M, Colak D, Cardona-Londoño KJ, Arold ST, Houlden H, Bertoli-Avella A, Kaya N, Barakat TS. Expanding the mutational landscape and clinical phenotype of the YIF1B related brain disorder. Brain. 2021 Nov 29;144(10):e85. doi: 10.1093/brain/awab297. PMID: 34373908; PMCID: PMC8634087.
No abstract
Sanri A, Mutlu MB, Sezer O. YIF1B-related Kaya-Barakat-Masson Syndrome: Report of a new patient and literature review. Eur J Med Genet. 2023 Jun;66(6):104751. doi: 10.1016/j.ejmg.2023.104751. Epub 2023 Mar 21. PMID: 36948290.
Abstract
Kaya-Barakat-Masson syndrome (KABAMAS) is a recently identified severe neurodevelopmental disorder characterized by severe global developmental delay, epilepsy, movement disorder, epilepsy, and microcephaly. KABAMAS is caused by bi-allelic variants in the YIF1B gene which encodes a trafficking protein involved in the anterograde traffic from the endoplasmic reticulum to the cell membrane including neural cells in association with other trafficking proteins and also Golgi apparatus morphology. That's why clinical overlapping between KABAMAS and golgipathies isn't surprising. It is a rare condition with only 24 patients reported to date. Here we described a 5.5-year-old boy presenting with severe global developmental delay, epileptic encephalopathy, microcephaly, dystonia, spasticity, blindness, feeding difficulties, respiratory failure, and dysmorphic features. Whole exome sequencing identified homozygous splice site variation (NM_001039672.3: c.297+1G > A) in the YIF1B gene. This splice site variant is rare in the general population (gnomAD Variant allele fraction (VAF): 0.0007%, 2 heterozygotes, 0 homozygotes) and has not previously been associated with the disease. Multiple in silico tools predict a deleterious effect of this splice site change. Considering the points mentioned above, we have considered the detected variant as pathogenic according to guidelines in light of current knowledge. By reporting a new case with the homozygous YIF1B splice site variant we provide further evidence to clinical and molecular data of this recently recognized severe neurodevelopmental disorder. We further emphasize that trafficking errors should be considered as an underlying mechanism in undiagnosed severe neurodevelopmental disorders.
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