Our verdict is Pathogenic. Variant got 17 ACMG points: 17P and 0B. PM2PM5PP2PP3_StrongPP5_Very_Strong
The NM_001368894.2(PAX6):c.112C>G(p.Arg38Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R38P) has been classified as Likely pathogenic.
PAX6 (HGNC:8620): (paired box 6) This gene encodes paired box protein Pax-6, one of many human homologs of the Drosophila melanogaster gene prd. In addition to a conserved paired box domain, a hallmark feature of this gene family, the encoded protein also contains a homeobox domain. Both domains are known to bind DNA and function as regulators of gene transcription. Activity of this protein is key in the development of neural tissues, particularly the eye. This gene is regulated by multiple enhancers located up to hundreds of kilobases distant from this locus. Mutations in this gene or in the enhancer regions can cause ocular disorders such as aniridia and Peter's anomaly. Use of alternate promoters and alternative splicing results in multiple transcript variants encoding different isoforms. Interestingly, inclusion of a particular alternate coding exon has been shown to increase the length of the paired box domain and alter its DNA binding specificity. Consequently, isoforms that carry the shorter paired box domain regulate a different set of genes compared to the isoforms carrying the longer paired box domain. [provided by RefSeq, Mar 2019]
Verdict is Pathogenic. Variant got 17 ACMG points.
PM2
Very rare variant in population databases, with high coverage;
PM5
Other missense variant is known to change same aminoacid residue: Variant chr11-31802732-C-G is described in Lovd as [Likely_pathogenic].
PP2
Missense variant in the PAX6 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 75 curated pathogenic missense variants (we use a threshold of 10). The gene has 15 curated benign missense variants. Gene score misZ: 2.8175 (below the threshold of 3.09). Trascript score misZ: 3.256 (above the threshold of 3.09). GenCC associations: The gene is linked to Peters anomaly, coloboma, ocular, autosomal dominant, coloboma of optic nerve, aniridia 1, PAX6-related ocular dysgenesis, foveal hypoplasia 1, foveal hypoplasia-presenile cataract syndrome, isolated aniridia, diabetes mellitus, aniridia-cerebellar ataxia-intellectual disability syndrome, autosomal dominant keratitis, isolated optic nerve hypoplasia.
PP3
MetaRNN computational evidence supports a deleterious effect, 0.984
PP5
Variant 11-31802733-G-C is Pathogenic according to our data. Variant chr11-31802733-G-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 637045.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr11-31802733-G-C is described in Lovd as [Pathogenic].
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