9-35682160-G-C

Position:

• chr9-35682160-G-C

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 3P and 6B. PM1 PP2 BP4_Moderate BS2

The NM_213674.1(TPM2):​c.776C>G​(p.Thr259Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000434 in 1,614,044 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/17 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: TPM2 NM_213674.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.66

Genes affected

TPM2 (HGNC:12011): (tropomyosin 2) This gene encodes beta-tropomyosin, a member of the actin filament binding protein family, and mainly expressed in slow, type 1 muscle fibers. Mutations in this gene can alter the expression of other sarcomeric tropomyosin proteins, and cause cap disease, nemaline myopathy and distal arthrogryposis syndromes. Alternatively spliced transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Mar 2009]

ACMG classification

Verdict is Likely_benign. Variant got -3 ACMG points.

• PM1: In a coiled_coil_region (size 283) in uniprot entity TPM2_HUMAN there are 34 pathogenic changes around while only 2 benign (94%) in NM_213674.1
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), TPM2. . Gene score misZ 2.1346 (greater than the threshold 3.09). Trascript score misZ 3.2245 (greater than threshold 3.09). GenCC has associacion of gene with cap myopathy, typical nemaline myopathy, digitotalar dysmorphism, congenital fiber-type disproportion myopathy, childhood-onset nemaline myopathy, congenital myopathy 23, Sheldon-hall syndrome, arthrogryposis, distal, type 1A, TPM2-related myopathy.
• BP4: Computational evidence support a benign effect (MetaRNN=0.20952818).
• BS2: High AC in GnomAdExome4 at 6 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TPM2	NM_001301226.2	c.776C>G	p.Thr259Ser	missense_variant	9/9		NP_001288155.1
TPM2	NM_213674.1	c.776C>G	p.Thr259Ser	missense_variant	9/9		NP_998839.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TPM2	ENST00000378292.9	c.776C>G	p.Thr259Ser	missense_variant	9/9	1		ENSP00000367542.3
TPM2	ENST00000329305.6	c.776C>G	p.Thr259Ser	missense_variant	9/9	2		ENSP00000367541.1
TPM2	ENST00000644325	c.*548C>G		3_prime_UTR_variant	4/4			ENSP00000495075.1

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152192 Hom.: 0 Cov.: 32

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: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.00000410 AC: 6 AN: 1461852 Hom.: 0 Cov.: 31 AF XY: 0.00000550 AC XY: 4 AN XY: 727226

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000540

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152192 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 74340

Gnomad4 AFR AF: 0.00

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: 0.0000147

Gnomad4 OTH AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Congenital myopathy with fiber type disproportion Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Feb 22, 2019

This variant was classified as: Uncertain significance. The available evidence on this variant's pathogenicity is insufficient or conflicting. The following ACMG criteria were applied in classifying this variant: PP2. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.19	T
BayesDel_noAF	Benign	-0.51
CADD	Benign	21
DANN	Uncertain	0.98
DEOGEN2	Uncertain	0.48	.;T;.
Eigen	Benign	-0.18
Eigen_PC	Benign	0.070
FATHMM_MKL	Benign	0.71	D
LIST_S2	Benign	0.69	.;T;T
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.21	T;T;T
MetaSVM	Benign	-0.81	T
PrimateAI	Uncertain	0.67	T
PROVEAN	Benign	0.59	N;N;.
REVEL	Benign	0.26
Sift	Benign	0.18	T;T;.
Sift4G	Benign	0.18	T;T;.
Polyphen		0.0	B;.;B
Vest4		0.14
MutPred		0.41		Gain of phosphorylation at T259 (P = 0.0405);Gain of phosphorylation at T259 (P = 0.0405);Gain of phosphorylation at T259 (P = 0.0405);
MVP		0.70
MPC		0.92
ClinPred		0.41	T
GERP RS		5.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

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: rs1197412497; hg19: chr9-35682157;