17-39665721-C-G

Variant names:

• chr17-39665721-C-G
• rs1555607027
• NM_003673.4:c.116C>G

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM1 PM2

The NM_003673.4(TCAP):​c.116C>G​(p.Ser39Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. S39S) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TCAP NM_003673.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.99
• Publications: 0 publications found

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]

TCAP Gene-Disease associations (from GenCC):

• autosomal recessive limb-girdle muscular dystrophy

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• hypertrophic cardiomyopathy 25

  Inheritance: AD Classification: STRONG, MODERATE, LIMITED Submitted by: Ambry Genetics, PanelApp Australia, Labcorp Genetics (formerly Invitae)
• autosomal recessive limb-girdle muscular dystrophy type 2G

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• dilated cardiomyopathy

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen
• hypertrophic cardiomyopathy

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM1: In a modified_residue Phosphoserine (size 0) in uniprot entity TELT_HUMAN
• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003673.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TCAP	NM_003673.4	MANE Select	c.116C>G	p.Ser39Cys	missense	Exon 2 of 2	NP_003664.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TCAP	ENST00000309889.3	TSL:1 MANE Select	c.116C>G	p.Ser39Cys	missense	Exon 2 of 2	ENSP00000312624.2
	TCAP	ENST00000578283.1	TSL:5	c.116C>G	p.Ser39Cys	missense	Exon 2 of 3	ENSP00000462787.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Primary familial hypertrophic cardiomyopathy;C4225408:Hypertrophic cardiomyopathy 25 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.097
BayesDel_addAF	Uncertain	0.10	D
BayesDel_noAF	Benign	-0.090
CADD	Uncertain	25
DANN	Benign	0.70
DEOGEN2	Uncertain	0.80	D
Eigen	Uncertain	0.38
Eigen_PC	Uncertain	0.39
FATHMM_MKL	Uncertain	0.79	D
LIST_S2	Benign	0.64	T
M_CAP	Uncertain	0.16	D
MetaRNN	Uncertain	0.56	D
MetaSVM	Uncertain	0.31	D
MutationAssessor	Benign	1.8	L
PhyloP100		2.0
PrimateAI	Uncertain	0.48	T
PROVEAN	Uncertain	-3.5	D
REVEL	Uncertain	0.49
Sift	Uncertain	0.0040	D
Sift4G	Uncertain	0.013	D
Polyphen		1.0	D
Vest4		0.22
MutPred		0.50		Gain of sheet (P = 0.0266)
MVP		0.96
MPC		0.89
ClinPred		0.92	D
GERP RS		5.7
PromoterAI		0.032	Neutral
Varity_R		0.56
gMVP		0.39
Mutation Taster		=50/50

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

Other links and lift over

dbSNP: rs1555607027; hg19: chr17-37821974;