Genetic Variant TRAPPC8:p.Val1417Leu (chr18-31830814-C-G) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_014939.5(TRAPPC8):c.4249G>C(p.Val1417Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000415 in 1,614,194 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00024 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000021 ( 1 hom. )

Consequence

TRAPPC8
NM_014939.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.11

Variant links:

Genes affected

TRAPPC8 (HGNC:29169): (trafficking protein particle complex subunit 8) Involved in Golgi organization. Part of TRAPP complex. [provided by Alliance of Genome Resources, Apr 2022]

TRAPPC8 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.010315865).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TRAPPC8	NM_014939.5 link	c.4249G>C	p.Val1417Leu	missense_variant	Exon 29 of 29	ENST00000283351.10	NP_055754.3	Q9Y2L5-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TRAPPC8	ENST00000283351.10 link	c.4249G>C	p.Val1417Leu	missense_variant	Exon 29 of 29	1	NM_014939.5	ENSP00000283351.4		Q9Y2L5-1

Frequencies

GnomAD3 genomes

AF:

0.000243

AC:

AN:

152196

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00242

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000636

AC:

AN:

251434

Hom.:

AF XY:

0.0000736

AC XY:

AN XY:

135892

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000463

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000205

AC:

AN:

1461880

Hom.:

Cov.:

AF XY:

0.0000206

AC XY:

AN XY:

727238

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.000604

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.000243

AC:

AN:

152314

Hom.:

Cov.:

AF XY:

0.000309

AC XY:

AN XY:

74478

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00242

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.000340

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jul 14, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.4249G>C (p.V1417L) alteration is located in exon 29 (coding exon 29) of the TRAPPC8 gene. This alteration results from a G to C substitution at nucleotide position 4249, causing the valine (V) at amino acid position 1417 to be replaced by a leucine (L). 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

Benign

0.092

BayesDel_addAF

Benign

-0.58

BayesDel_noAF

Benign

-0.75

CADD

Benign

DANN

Benign

0.92

DEOGEN2

Benign

0.0011

T;T

Eigen

Benign

-0.50

Eigen_PC

Benign

-0.28

FATHMM_MKL

Benign

0.39

LIST_S2

Benign

0.84

T;T

M_CAP

Benign

0.0029

MetaRNN

Benign

0.010

T;T

MetaSVM

Benign

-0.97

MutationAssessor

Benign

-1.3

N;.

PrimateAI

Benign

0.45

PROVEAN

Benign

0.060

N;.

REVEL

Benign

0.075

Sift

Benign

0.49

T;.

Sift4G

Benign

0.81

T;T

Polyphen

0.0

B;.

Vest4

0.033

MutPred

0.21

Loss of sheet (P = 0.0817);.;

MVP

0.043

MPC

0.12

ClinPred

0.035

GERP RS

3.8

Varity_R

0.040

gMVP

0.095

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