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Macrocephaly_Megalencephaly v0.140 MYCN Zornitza Stark Phenotypes for gene: MYCN were changed from Neurodevelopmental disorder (MONDO:0700092), MYCN-related to Megalencephaly-polydactyly syndrome, MIM# 620748
Macrocephaly_Megalencephaly v0.139 MYCN Zornitza Stark reviewed gene: MYCN: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Megalencephaly-polydactyly syndrome, MIM# 620748; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Macrocephaly_Megalencephaly v0.134 MYCN Elena Savva Phenotypes for gene: MYCN were changed from Neurodevelopmental disorder with megalencephaly to Neurodevelopmental disorder (MONDO:0700092), MYCN-related
Macrocephaly_Megalencephaly v0.133 MYCN Elena Savva Publications for gene: MYCN were set to 30573562
Macrocephaly_Megalencephaly v0.133 MYCN Elena Savva Classified gene: MYCN as Green List (high evidence)
Macrocephaly_Megalencephaly v0.133 MYCN Elena Savva Gene: mycn has been classified as Green List (High Evidence).
Macrocephaly_Megalencephaly v0.132 MYCN Naomi Baker reviewed gene: MYCN: Rating: GREEN; Mode of pathogenicity: Other; Publications: PMID:37710961; Phenotypes: Neurodevelopmental disorder (MONDO:0700092), MYCN-related; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Macrocephaly_Megalencephaly v0.72 MYCN Zornitza Stark Marked gene: MYCN as ready
Macrocephaly_Megalencephaly v0.72 MYCN Zornitza Stark Gene: mycn has been classified as Red List (Low Evidence).
Macrocephaly_Megalencephaly v0.72 MYCN Zornitza Stark Classified gene: MYCN as Red List (low evidence)
Macrocephaly_Megalencephaly v0.72 MYCN Zornitza Stark Gene: mycn has been classified as Red List (Low Evidence).
Macrocephaly_Megalencephaly v0.71 MYCN Kristin Rigbye gene: MYCN was added
gene: MYCN was added to Macrocephaly_Megalencephaly. Sources: Literature
Mode of inheritance for gene: MYCN was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Publications for gene: MYCN were set to 30573562
Phenotypes for gene: MYCN were set to Neurodevelopmental disorder with megalencephaly
Mode of pathogenicity for gene: MYCN was set to Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments
Review for gene: MYCN was set to RED
Added comment: Single report of a de novo missense p.T58M in an individual with a novel megalencephaly syndrome, a Japanese boy with an intellectual disability (ID), distinctive facies, megalencephaly, ventriculomegaly, hypoplastic corpus callosum, postnatal growth retardation, postaxial polydactyly and neuroblastoma.

Biochemical and cell biology experiments revealed that the mutation renders MYCN resistant to proteolysis and may improperly potentiate cortical neuron proliferation. MYCN activity regulates granule neuron proliferation through induction of CCND1 and CCND2, and this syndrome was similar to CCND2 gene abnormalities that impart excessive protein stability cause megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome. This residue is also frequently mutated in c-Myc in Burkitt’s lymphoma (also due to GoF by gene amplification), consistent with its functions in cell proliferation and differentiation.
Sources: Literature