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| Mendeliome v1.4512 | LMNB1 upstream region |
Sarah Milton Region: LMNB1 upstream region was added Region: LMNB1 upstream region was added to Mendeliome. Sources: Literature Mode of inheritance for Region: LMNB1 upstream region was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted Publications for Region: LMNB1 upstream region were set to PMID: 30842973; 30697589; 25701871 Phenotypes for Region: LMNB1 upstream region were set to Adult-onset autosomal dominant demyelinating leukodystrophy, MONDO:0008215 Review for Region: LMNB1 upstream region was set to GREEN Added comment: LMNB1 encodes an intermediate filament proteins which play a role in forming the nuclear lamina lining the inner nuclear membrane. Overexpression of LMNB1 via gene duplication has been well established to cause adult-onset autosomal dominant demyelinating leukodystrophy, MONDO:0008215. PMID: 30842973; 30697589; 25701871 report deletional forms of the phenotype. With an approx 167kb minimal critical region upstream of LMNB1 that has been associated with adult-onset autosomal dominant demyelinating leukodystrophy in 5 families with over 35 individuals affected. The deletion is upstream of the promoter of LMNB1 and involves other protein coding genes (ALDH7A1/PHAX) that are thought to be bystanders. The proposed molecular mechanism of disease for these deletions is disruption of a topologically associated domain boundary resulting in overexpression of LMNB1. This occurs by placing the promoter in closer proximity to an upstream enhancer element. Extensive functional studies support this hypothesis and affected individuals have been shown to have upregulated LMNB1 protein on Western blot. Note the coordinates differ between families with much larger deletions reported in many affected individuals. Sources: Literature |
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