chr2-196897132-TGTTTA-T

Position:

• chr2-196897132-TGTTTA-T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_024989.4(PGAP1):​c.921_925del​(p.Lys308AsnfsTer25) variant causes a frameshift, splice region change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PGAP1 NM_024989.4 frameshift, splice_region
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 5.79

Genes affected

PGAP1 (HGNC:25712): (post-GPI attachment to proteins inositol deacylase 1) The protein encoded by this gene functions early in the glycosylphosphatidylinositol (GPI) biosynthetic pathway, catalyzing the inositol deacylation of GPI. The encoded protein is required for the production of GPI that can attach to proteins, and this may be an important factor in the transport of GPI-anchored proteins from the endoplasmic reticulum to the Golgi. Defects in this gene are a cause an autosomal recessive form of cognitive impairment. [provided by RefSeq, Jul 2017]

ACMG classification

Verdict is Pathogenic. Variant got 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
• PP5: Variant 2-196897132-TGTTTA-T is Pathogenic according to our data. Variant chr2-196897132-TGTTTA-T is described in ClinVar as [Pathogenic]. Clinvar id is 222980.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr2-196897132-TGTTTA-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PGAP1	NM_024989.4	c.921_925del	p.Lys308AsnfsTer25	frameshift_variant, splice_region_variant	7/27	ENST00000354764.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PGAP1	ENST00000354764.9	c.921_925del	p.Lys308AsnfsTer25	frameshift_variant, splice_region_variant	7/27	1	NM_024989.4	P1

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:2

Revision: criteria provided, single submitter

Submissions by phenotype

Cerebral visual impairment and intellectual disability Pathogenic:1

Pathogenic, criteria provided, single submitter

research

Lupski Lab, Baylor-Hopkins CMG, Baylor College of Medicine

Sep 09, 2015

This study shows that diverse genetic causes underlie CVI. -

Intellectual disability, autosomal recessive 42 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

May 24, 2021

- -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs869025580; hg19: chr2-197761856;