Genetic Variant TRAPPC3L:p.Ile14Thr (chr6-116545474-A-G) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001139444.3(TRAPPC3L):c.41T>C(p.Ile14Thr) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.00000323 in 1,545,908 control chromosomes in the GnomAD database, with no homozygous occurrence. 2/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000022 ( 0 hom. )

Consequence

TRAPPC3L
NM_001139444.3 missense, splice_region

Scores

Splicing: ADA: 0.9518

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.19

Variant links:

Genes affected

TRAPPC3L (HGNC:21090): (trafficking protein particle complex subunit 3L) Predicted to be involved in endoplasmic reticulum to Golgi vesicle-mediated transport and intra-Golgi vesicle-mediated transport. Part of TRAPP complex. [provided by Alliance of Genome Resources, Apr 2022]

TRAPPC3L links:

CALHM4 (HGNC:21094): (calcium homeostasis modulator family member 4) Predicted to enable cation channel activity. Predicted to be involved in cation transmembrane transport. Predicted to be integral component of membrane. Predicted to be integral component of plasma membrane. [provided by Alliance of Genome Resources, Apr 2022]

CALHM4 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TRAPPC3L	NM_001139444.3 link	c.41T>C	p.Ile14Thr	missense_variant, splice_region_variant	Exon 1 of 5	ENST00000368602.4	NP_001132916.1	Q5T215-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TRAPPC3L	ENST00000368602.4 link	c.41T>C	p.Ile14Thr	missense_variant, splice_region_variant	Exon 1 of 5	5	NM_001139444.3	ENSP00000357591.3		Q5T215-1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152138

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000215

AC:

AN:

1393770

Hom.:

Cov.:

AF XY:

0.00000436

AC XY:

AN XY:

687394

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000281

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000186

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152138

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74316

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Feb 19, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.41T>C (p.I14T) alteration is located in exon 1 (coding exon 1) of the TRAPPC3L gene. This alteration results from a T to C substitution at nucleotide position 41, causing the isoleucine (I) at amino acid position 14 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.65

BayesDel_addAF

Pathogenic

0.40

BayesDel_noAF

Pathogenic

0.34

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Benign

0.25

Eigen

Pathogenic

0.72

Eigen_PC

Pathogenic

0.70

FATHMM_MKL

Uncertain

0.96

LIST_S2

Benign

0.50

M_CAP

Benign

0.012

MetaRNN

Uncertain

0.57

MetaSVM

Uncertain

-0.19

MutationAssessor

Uncertain

2.8

PrimateAI

Pathogenic

0.79

PROVEAN

Uncertain

-2.5

REVEL

Uncertain

0.35

Sift

Uncertain

0.0020

Sift4G

Uncertain

0.0050

Polyphen

0.97

Vest4

0.60

MutPred

0.56

Loss of stability (P = 0.0057);

MVP

0.16

ClinPred

0.98

GERP RS

5.8

Varity_R

0.44

gMVP

0.85

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.95

dbscSNV1_RF

Pathogenic

0.76

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