NM_021942.6:c.3G>A

Variant names:

• chr4-183663870-G-A
• rs1734696063
• NM_021942.6:c.3G>A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PVS1_Supporting PM2

The NM_021942.6(TRAPPC11):​c.3G>A​(p.Met1?) variant causes a start lost change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000662 in 151,026 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: 𝑓 0.0000066 (0 hom., cov: 31)
• Consequence: TRAPPC11 NM_021942.6 start_lost
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.16

Genes affected

TRAPPC11 (HGNC:25751): (trafficking protein particle complex subunit 11) The protein encoded by this gene is a subunit of the TRAPP (transport protein particle) tethering complex, which functions in intracellular vesicle trafficking. This subunit is involved in early stage endoplasmic reticulum-to-Golgi vesicle transport. Alternative splicing of this gene results in multiple transcript variants. [provided by RefSeq, Jan 2013]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PVS1: Start lost variant, no pathogenic variants between lost start and next in-frame start position. Next in-frame start position is after 17 codons. Genomic position: 183663916. Lost 0.014 part of the original CDS.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TRAPPC11	NM_021942.6	c.3G>A	p.Met1?	start_lost	Exon 2 of 30	ENST00000334690.11	NP_068761.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TRAPPC11	ENST00000334690.11	c.3G>A	p.Met1?	start_lost	Exon 2 of 30	1	NM_021942.6	ENSP00000335371.6

Frequencies

GnomAD3 genomes AF: 0.00000662 AC: 1 AN: 151026 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.0000244

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

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

GnomAD4 exome Cov.: 32

GnomAD4 genome AF: 0.00000662 AC: 1 AN: 151026 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 73692

Gnomad4 AFR AF: 0.0000244

Gnomad4 AMR AF: 0.00

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

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Autosomal recessive limb-girdle muscular dystrophy type R18 Uncertain:1

Aug 09, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. This variant has not been reported in the literature in individuals affected with TRAPPC11-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change affects the initiator methionine of the TRAPPC11 mRNA. The next in-frame methionine is located at codon 17. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.44
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Benign	0.026	T;.
Eigen	Uncertain	0.40
Eigen_PC	Uncertain	0.53
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.90	D;D
M_CAP	Uncertain	0.10	D
MetaRNN	Pathogenic	0.98	D;D
MetaSVM	Benign	-0.64	T
PROVEAN	Benign	-1.1	N;N
REVEL	Uncertain	0.50
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		0.38	B;P
Vest4		0.88
MutPred		0.99		Gain of catalytic residue at M1 (P = 0.0277);Gain of catalytic residue at M1 (P = 0.0277);
MVP		0.40
ClinPred		0.97	D
GERP RS		5.8
Varity_R		0.73
gMVP		0.61

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

Other links and lift over

dbSNP: rs1734696063; hg19: chr4-184585023; COSMIC: COSV58219680; COSMIC: COSV58219680;