rs762428326

Variant names:

• chr2-178734365-G-A
• rs762428326
• NM_001267550.2:c.15459C>T
• TTN p.Val5153Val

Your query was ambiguous. Multiple possible variants found:

• chr2-178734365-G-A
• chr2-178734365-G-C

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_Strong BP6_Very_Strong BP7

The NM_001267550.2(TTN):​c.15459C>T​(p.Val5153Val) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000186 in 1,453,536 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. V5153V) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000019 (0 hom.)
• Consequence: TTN NM_001267550.2 synonymous
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: 0.0640
• Publications: 1 publications found

Genes affected

TTN (HGNC:12403): (titin) This gene encodes a large abundant protein of striated muscle. The product of this gene is divided into two regions, a N-terminal I-band and a C-terminal A-band. The I-band, which is the elastic part of the molecule, contains two regions of tandem immunoglobulin domains on either side of a PEVK region that is rich in proline, glutamate, valine and lysine. The A-band, which is thought to act as a protein-ruler, contains a mixture of immunoglobulin and fibronectin repeats, and possesses kinase activity. An N-terminal Z-disc region and a C-terminal M-line region bind to the Z-line and M-line of the sarcomere, respectively, so that a single titin molecule spans half the length of a sarcomere. Titin also contains binding sites for muscle associated proteins so it serves as an adhesion template for the assembly of contractile machinery in muscle cells. It has also been identified as a structural protein for chromosomes. Alternative splicing of this gene results in multiple transcript variants. Considerable variability exists in the I-band, the M-line and the Z-disc regions of titin. Variability in the I-band region contributes to the differences in elasticity of different titin isoforms and, therefore, to the differences in elasticity of different muscle types. Mutations in this gene are associated with familial hypertrophic cardiomyopathy 9, and autoantibodies to titin are produced in patients with the autoimmune disease scleroderma. [provided by RefSeq, Feb 2012]

TTN-AS1 (HGNC:44124): (TTN antisense RNA 1) This gene encodes a non-coding RNA transcribed from the opposite strand to the titin gene. [provided by RefSeq, Aug 2016]

ACMG classification

Our verdict: Benign. The variant received -13 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.79).
• BP6: Variant 2-178734365-G-A is Benign according to our data. Variant chr2-178734365-G-A is described in ClinVar as Likely_benign. ClinVar VariationId is 586870.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=0.064 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001267550.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TTN	NM_001267550.2	MANE Select	c.15459C>T	p.Val5153Val	synonymous	Exon 52 of 363	NP_001254479.2	Q8WZ42-12
	TTN	NM_001256850.1		c.14508C>T	p.Val4836Val	synonymous	Exon 50 of 313	NP_001243779.1	Q8WZ42-1
	TTN	NM_133378.4		c.11727C>T	p.Val3909Val	synonymous	Exon 49 of 312	NP_596869.4	Q8WZ42-11

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TTN	ENST00000589042.5	TSL:5 MANE Select	c.15459C>T	p.Val5153Val	synonymous	Exon 52 of 363	ENSP00000467141.1	Q8WZ42-12
	TTN	ENST00000446966.2	TSL:1	c.15459C>T	p.Val5153Val	synonymous	Exon 52 of 361	ENSP00000408004.2	A0A1B0GXE3
	TTN	ENST00000436599.2	TSL:1	c.15183C>T	p.Val5061Val	synonymous	Exon 50 of 361	ENSP00000405517.2	A0A0C4DG59

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.0000163 AC: 4 AN: 245836 AF XY: 0.0000225

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000294

Gnomad ASJ exome AF: 0.000202

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000896

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000186 AC: 27 AN: 1453536 Hom.: 0 Cov.: 31 AF XY: 0.0000194 AC XY: 14 AN XY: 721956

African (AFR) AF: 0.0000300 AC: 1 AN: 33312

American (AMR) AF: 0.0000226 AC: 1 AN: 44212

Ashkenazi Jewish (ASJ) AF: 0.0000771 AC: 2 AN: 25940

East Asian (EAS) AF: 0.0000253 AC: 1 AN: 39528

South Asian (SAS) AF: 0.00 AC: 0 AN: 85122

European-Finnish (FIN) AF: 0.0000377 AC: 2 AN: 53006

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5740

European-Non Finnish (NFE) AF: 0.0000154 AC: 17 AN: 1106656

Other (OTH) AF: 0.0000500 AC: 3 AN: 60020

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000868 Hom.: 0

Bravo AF: 0.0000189

ClinVar

ClinVar submissions

Significance: Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	1	Autosomal recessive limb-girdle muscular dystrophy type 2J;C1858763:Dilated cardiomyopathy 1G (1)
-	-	1	not provided (1)
-	-	1	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.79
CADD	Benign	4.0
DANN	Benign	0.71
PhyloP100		0.064
Mutation Taster		=92/8	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs762428326;

hg19: chr2-179599092;

COSMIC: COSV59923210;

COSMIC: COSV59923210;