NM_001368894.2:c.491_495delACGGGinsCCGGAAC

Variant names:

• chr11-31800761-CCCGT-GTTCCGG
• rs1131692305
• NM_001368894.2:c.491_495delACGGGinsCCGGAAC

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP2 PP5

The NM_001368894.2(PAX6):​c.491_495delACGGGinsCCGGAAC​(p.Asn164ThrfsTer58) variant causes a frameshift, missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (no stars). Synonymous variant affecting the same amino acid position (i.e. N164N) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PAX6 NM_001368894.2 frameshift, missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 7.39
• Publications: 0 publications found

Genes affected

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]

PAX6 Gene-Disease associations (from GenCC):

• aniridia 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, G2P, Labcorp Genetics (formerly Invitae)
• PAX6-related ocular dysgenesis

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• Peters anomaly

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: PanelApp Australia, G2P, Orphanet, Labcorp Genetics (formerly Invitae)
• coloboma, ocular, autosomal dominant

  Inheritance: AD Classification: STRONG Submitted by: PanelApp Australia
• diabetes mellitus

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• aniridia-cerebellar ataxia-intellectual disability syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• foveal hypoplasia-presenile cataract syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• isolated aniridia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• isolated optic nerve hypoplasia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• autosomal dominant keratitis

  Inheritance: Unknown, AD Classification: SUPPORTIVE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• 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, diabetes mellitus, aniridia-cerebellar ataxia-intellectual disability syndrome, foveal hypoplasia-presenile cataract syndrome, aniridia 1, PAX6-related ocular dysgenesis, coloboma, ocular, autosomal dominant, isolated optic nerve hypoplasia, autosomal dominant keratitis, isolated aniridia.
• PP5: Variant 11-31800761-CCCGT-GTTCCGG is Pathogenic according to our data. Variant chr11-31800761-CCCGT-GTTCCGG is described in ClinVar as Pathogenic. ClinVar VariationId is 430995.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PAX6	NM_001368894.2	c.491_495delACGGGinsCCGGAAC	p.Asn164ThrfsTer58	frameshift_variant, missense_variant	Exon 8 of 14	ENST00000640368.2	NP_001355823.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PAX6	ENST00000640368.2	c.491_495delACGGGinsCCGGAAC	p.Asn164ThrfsTer58	frameshift_variant, missense_variant	Exon 8 of 14	5	NM_001368894.2	ENSP00000492024.1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Aniridia 1 Pathogenic:1

-

Laboratory of Genetic Epidemiology, Research Centre for Medical Genetics

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: research

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		7.4

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1131692305; hg19: chr11-31822309;