Genetic Variant TRAPPC12:p.Pro19LeufsTer44 (chr2-3387673-AC-A) – ACMG Classification: Likely_pathogenic (8 pts)

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PVS1_StrongPM2PP5_Moderate

The NM_016030.6(TRAPPC12):c.56delC(p.Pro19LeufsTer44) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000641 in 1,403,714 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★).

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000064 ( 0 hom. )

Consequence

TRAPPC12
NM_016030.6 frameshift

Scores

Not classified

Clinical Significance

Likely pathogenic criteria provided, single submitter P:1

Conservation

PhyloP100: -1.11

Variant links:

Genes affected

TRAPPC12 (HGNC:24284): (trafficking protein particle complex subunit 12) Involved in several processes, including endoplasmic reticulum to Golgi vesicle-mediated transport; positive regulation of protein localization to kinetochore; and regulation of kinetochore assembly. Located in Golgi apparatus; kinetochore; and nucleoplasm. Part of TRAPP complex. Colocalizes with endoplasmic reticulum-Golgi intermediate compartment and perinuclear region of cytoplasm. [provided by Alliance of Genome Resources, Apr 2022]

TRAPPC12 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

PVS1

Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.975 CDS is truncated, and there are 0 pathogenic variants in the truncated region.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 2-3387673-AC-A is Pathogenic according to our data. Variant chr2-3387673-AC-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 2584443.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TRAPPC12	NM_016030.6 link	c.56delC	p.Pro19LeufsTer44	frameshift_variant	Exon 2 of 12	ENST00000324266.10	NP_057114.5	Q8WVT3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
TRAPPC12	ENST00000324266.10 link	c.56delC	p.Pro19LeufsTer44	frameshift_variant	Exon 2 of 12	1	NM_016030.6	ENSP00000324318.5	Q8WVT3
TRAPPC12	ENST00000382110.6 link	c.56delC	p.Pro19LeufsTer44	frameshift_variant	Exon 2 of 12	2		ENSP00000371544.2	Q8WVT3
TRAPPC12	ENST00000482645.1 link	n.217delC		non_coding_transcript_exon_variant	Exon 2 of 2	2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000186

AC:

AN:

161182

Hom.:

AF XY:

0.0000232

AC XY:

AN XY:

86100

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000397

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000862

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000641

AC:

AN:

1403714

Hom.:

Cov.:

AF XY:

0.0000115

AC XY:

AN XY:

692922

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000826

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000753

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Early-onset progressive encephalopathy-hearing loss-pons hypoplasia-brain atrophy syndrome

Pathogenic:1

Rady Children's Institute for Genomic Medicine, Rady Children's Hospital San Diego

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This frameshifting variant in exon 2 of 12 is predicted to result in loss of normal protein function through either protein truncation or nonsense-mediated mRNA decay. This variant has not been previously reported or functionally characterized in the literature to our knowledge. The c.56del (p.Pro19LeufsTer44) variant is present in the heterozygous state in the gnomAD population database at a frequency of 0.002% (3/161182) and is absent in the homozygous state. Based on the available evidence, the c.56del (p.Pro19LeufsTer44) variant is classified as Likely Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over