chr4-153270425-C-T

Position:

• chr4-153270425-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_015271.5(TRIM2):​c.121C>T​(p.Arg41Cys) variant causes a missense change. The variant allele was found at a frequency of 0.000028 in 1,461,750 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R41H) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000028 (0 hom.)
• Consequence: TRIM2 NM_015271.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.88

Genes affected

TRIM2 (HGNC:15974): (tripartite motif containing 2) The protein encoded by this gene is a member of the tripartite motif (TRIM) family. The TRIM motif includes three zinc-binding domains, a RING, a B-box type 1 and a B-box type 2, and a coiled-coil region. The protein localizes to cytoplasmic filaments. It plays a neuroprotective role and functions as an E3-ubiquitin ligase in proteasome-mediated degradation of target proteins. Mutations in this gene can cause early-onset axonal neuropathy. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Nov 2014]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), TRIM2. . Gene score misZ 3.5715 (greater than the threshold 3.09). Trascript score misZ 3.9409 (greater than threshold 3.09). GenCC has associacion of gene with Charcot-Marie-Tooth disease type 2R.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TRIM2	NM_015271.5	c.121C>T	p.Arg41Cys	missense_variant	2/12	ENST00000338700.10	NP_056086.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TRIM2	ENST00000338700.10	c.121C>T	p.Arg41Cys	missense_variant	2/12	1	NM_015271.5	ENSP00000339659

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000239 AC: 6 AN: 251274 Hom.: 0 AF XY: 0.0000295 AC XY: 4 AN XY: 135802

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000544

Gnomad SAS exome AF: 0.0000654

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000264

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000280 AC: 41 AN: 1461750 Hom.: 0 Cov.: 31 AF XY: 0.0000316 AC XY: 23 AN XY: 727174

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000696

Gnomad4 FIN exome AF: 0.0000187

Gnomad4 NFE exome AF: 0.0000306

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000756

ExAC AF: 0.0000247 AC: 3

EpiCase AF: 0.0000545

EpiControl AF: 0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Charcot-Marie-Tooth disease type 2R Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 25, 2023

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. This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 14 of the TRIM2 protein (p.Arg14Cys). This variant is present in population databases (rs763080800, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with TRIM2-related conditions. ClinVar contains an entry for this variant (Variation ID: 935743). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant  is likely to be tolerated. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.24
BayesDel_addAF	Uncertain	0.077	D
BayesDel_noAF	Uncertain	0.080
CADD	Pathogenic	33
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.52	.;D;T;.;.;T;.
Eigen	Pathogenic	0.69
Eigen_PC	Pathogenic	0.71
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.96	D;D;D;D;.;D;D
M_CAP	Benign	0.030	D
MetaRNN	Uncertain	0.56	D;D;D;D;D;D;D
MetaSVM	Uncertain	-0.086	T
MutationAssessor	Benign	1.9	.;L;.;.;.;.;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.84	D
PROVEAN	Uncertain	-3.8	D;D;.;D;.;.;.
REVEL	Uncertain	0.35
Sift	Uncertain	0.0030	D;D;.;D;.;.;.
Sift4G	Uncertain	0.016	D;D;D;D;D;D;D
Polyphen		1.0	D;D;.;.;.;.;.
Vest4		0.60, 0.60, 0.53, 0.59, 0.50
MutPred		0.48		Gain of ubiquitination at K18 (P = 0.0516);Gain of ubiquitination at K18 (P = 0.0516);Gain of ubiquitination at K18 (P = 0.0516);.;Gain of ubiquitination at K18 (P = 0.0516);Gain of ubiquitination at K18 (P = 0.0516);Gain of ubiquitination at K18 (P = 0.0516);
MVP		0.43
MPC		1.1
ClinPred		0.76	D
GERP RS		5.7
Varity_R		0.37
gMVP		0.46

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs763080800; hg19: chr4-154191577; COSMIC: COSV58634723; COSMIC: COSV58634723;