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| Macrocephaly_Megalencephaly v0.158 | FIBP | Zornitza Stark edited their review of gene: FIBP: Added comment: Beyond the two families previously reviewed (PMIDs 26660953; 27183861), four additional studies (PMIDs 36919607, 37218527, 37876348, 40099975) contribute four new unrelated families (total six unrelated families, nine patients) with a consistent autosomal‑recessive overgrowth syndrome. All six families have biallelic loss‑of‑function FIBP variants (nonsense or frameshift leading to NMD). Detailed clinical descriptions include overgrowth, macrocephaly, facial dysmorphism, developmental delay/intellectual disability, renal dysplasia and, in two families, early‑onset tumor predisposition. Segregation analyses confirm recessive inheritance in every case. Functional work (RT‑qPCR, fibroblast proliferation assays, mouse embryonic expression) demonstrates reduced FIBP expression and increased cell proliferation, supporting pathogenicity.; Changed rating: GREEN; Changed publications: 40099975, 37876348, 36919607, 27183861, 26660953 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Macrocephaly_Megalencephaly v0.79 | PPP2R1A |
Elena Savva gene: PPP2R1A was added gene: PPP2R1A was added to Macrocephaly_Megalencephaly. Sources: Literature Mode of inheritance for gene: PPP2R1A was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: PPP2R1A were set to PMID: 33106617; 26168268 Phenotypes for gene: PPP2R1A were set to Mental retardation, autosomal dominant 36 MIM#616362 Mode of pathogenicity for gene: PPP2R1A was set to Other Review for gene: PPP2R1A was set to GREEN Added comment: Likely dominant negative. For some variants, binding assays using HEK293T cells transfected with either WT or mutant constructs demonstrated decreased binding to B subunit families or C subunit with corresponding decrease in PP2A activity by affecting the trimeric holoenzyme (hypothesized by authors) ((PMIDs: 26168268, 33106617). 11/29 patients were macrocephalic, conversely 7/29 patients were microcephalic. All variants were in the same region and all were missense. Sources: Literature |
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| Macrocephaly_Megalencephaly v0.0 | IDS |
Zornitza Stark gene: IDS was added gene: IDS was added to Macrocephaly/Megalencephaly_VCGS. Sources: Expert Review Green,Victorian Clinical Genetics Services Mode of inheritance for gene: IDS was set to Unknown |
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