chr17-39666053-G-T

Position:

• chr17-39666053-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_003673.4(TCAP):​c.448G>T​(p.Gly150Cys) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,455,274 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: TCAP NM_003673.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.65

Genes affected

TCAP (HGNC:11610): (titin-cap) Sarcomere assembly is regulated by the muscle protein titin. Titin is a giant elastic protein with kinase activity that extends half the length of a sarcomere. It serves as a scaffold to which myofibrils and other muscle related proteins are attached. This gene encodes a protein found in striated and cardiac muscle that binds to the titin Z1-Z2 domains and is a substrate of titin kinase, interactions thought to be critical to sarcomere assembly. Mutations in this gene are associated with limb-girdle muscular dystrophy type 2G. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.801

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TCAP	NM_003673.4	c.448G>T	p.Gly150Cys	missense_variant	2/2	ENST00000309889.3	NP_003664.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TCAP	ENST00000309889.3	c.448G>T	p.Gly150Cys	missense_variant	2/2	1	NM_003673.4	ENSP00000312624.2
TCAP	ENST00000578283.1	c.376G>T	p.Gly126Cys	missense_variant	3/3	5		ENSP00000462787.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000409 AC: 1 AN: 244758 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 133160

Gnomad AFR exome AF: 0.0000619

Gnomad AMR exome AF: 0.00

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: 0.00000137 AC: 2 AN: 1455274 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 724264

Gnomad4 AFR exome AF: 0.0000597

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Benign	-0.038	T
BayesDel_noAF	Benign	-0.11
CADD	Pathogenic	27
DANN	Benign	0.88
DEOGEN2	Uncertain	0.78	D;.
Eigen	Uncertain	0.21
Eigen_PC	Benign	0.18
FATHMM_MKL	Uncertain	0.86	D
LIST_S2	Benign	0.80	T;T
M_CAP	Uncertain	0.17	D
MetaRNN	Pathogenic	0.80	D;D
MetaSVM	Uncertain	-0.042	T
MutationAssessor	Benign	1.9	M;.
PrimateAI	Uncertain	0.53	T
PROVEAN	Uncertain	-3.3	D;.
REVEL	Uncertain	0.45
Sift	Uncertain	0.022	D;.
Sift4G	Benign	0.081	T;T
Polyphen		1.0	D;.
Vest4		0.58
MutPred		0.65		Gain of catalytic residue at P149 (P = 0.0135);.;
MVP		0.97
MPC		0.97
ClinPred		0.91	D
GERP RS		4.8
Varity_R		0.40
gMVP		0.39

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: rs762850913; hg19: chr17-37822306;