rs141817409

Variant names:

• chr2-178548411-C-T
• rs141817409
• NM_001267550.2:c.93215G>A

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4_Strong BP6

The NM_001267550.2(TTN):​c.93215G>A​(p.Arg31072His) variant causes a missense change. The variant allele was found at a frequency of 0.0000775 in 1,613,802 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R31072C) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.00030 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000055 (0 hom.)
• Consequence: TTN NM_001267550.2 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3 B:7
• Conservation: PhyloP100: 4.98
• Publications: 5 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: Likely_benign. The variant received -5 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.028191924).
• BP6: Variant 2-178548411-C-T is Benign according to our data. Variant chr2-178548411-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 413039.

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.93215G>A	p.Arg31072His	missense	Exon 339 of 363	NP_001254479.2	Q8WZ42-12
	TTN	NM_001256850.1		c.88292G>A	p.Arg29431His	missense	Exon 289 of 313	NP_001243779.1	Q8WZ42-1
	TTN	NM_133378.4		c.85511G>A	p.Arg28504His	missense	Exon 288 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.93215G>A	p.Arg31072His	missense	Exon 339 of 363	ENSP00000467141.1	Q8WZ42-12
	TTN	ENST00000446966.2	TSL:1	c.93059G>A	p.Arg31020His	missense	Exon 337 of 361	ENSP00000408004.2	A0A1B0GXE3
	TTN	ENST00000436599.2	TSL:1	c.92939G>A	p.Arg30980His	missense	Exon 337 of 361	ENSP00000405517.2	A0A0C4DG59

Frequencies

GnomAD3 genomes AF: 0.000289 AC: 44 AN: 152102 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.000941

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000193

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.0000943

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.000105 AC: 26 AN: 248210 AF XY: 0.0000669

Gnomad AFR exome AF: 0.00110

Gnomad AMR exome AF: 0.000203

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.0000464

Gnomad NFE exome AF: 0.00000892

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000547 AC: 80 AN: 1461582 Hom.: 0 Cov.: 35 AF XY: 0.0000426 AC XY: 31 AN XY: 727066

African (AFR) AF: 0.00122 AC: 41 AN: 33474

American (AMR) AF: 0.000224 AC: 10 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26128

East Asian (EAS) AF: 0.0000504 AC: 2 AN: 39698

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53376

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.0000207 AC: 23 AN: 1111786

Other (OTH) AF: 0.0000663 AC: 4 AN: 60372

GnomAD4 genome AF: 0.000296 AC: 45 AN: 152220 Hom.: 0 Cov.: 33 AF XY: 0.000282 AC XY: 21 AN XY: 74412

African (AFR) AF: 0.000963 AC: 40 AN: 41556

American (AMR) AF: 0.0000654 AC: 1 AN: 15294

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.000194 AC: 1 AN: 5166

South Asian (SAS) AF: 0.00 AC: 0 AN: 4812

European-Finnish (FIN) AF: 0.0000943 AC: 1 AN: 10604

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.0000294 AC: 2 AN: 68002

Other (OTH) AF: 0.00 AC: 0 AN: 2110

Alfa AF: 0.000147 Hom.: 0

Bravo AF: 0.000329

ESP6500AA AF: 0.00123 AC: 5

ESP6500EA AF: 0.00 AC: 0

ExAC AF: 0.000124 AC: 15

EpiCase AF: 0.000109

EpiControl AF: 0.00

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	3	2	not provided (5)
-	-	2	not specified (2)
-	-	1	Autosomal recessive limb-girdle muscular dystrophy type 2J;C1858763:Dilated cardiomyopathy 1G (1)
-	-	1	Cardiovascular phenotype (1)
-	-	1	Limb-girdle muscular dystrophy (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.24
BayesDel_addAF	Benign	-0.35	T
BayesDel_noAF	Benign	-0.32
CADD	Benign	22
DANN	Uncertain	0.98
Eigen	Uncertain	0.44
Eigen_PC	Uncertain	0.53
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.90	D
M_CAP	Benign	0.064	D
MetaRNN	Benign	0.028	T
MetaSVM	Benign	-0.74	T
MutationAssessor	Benign	1.5	L
PhyloP100		5.0
PrimateAI	Benign	0.45	T
PROVEAN	Uncertain	-3.4	D
REVEL	Benign	0.27
Sift	Benign	0.099	T
Polyphen		0.78	P
Vest4		0.45
MVP		0.30
MPC		0.15
ClinPred		0.080	T
GERP RS		5.7
Mutation Taster		=93/7	polymorphism

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: rs141817409; hg19: chr2-179413138; COSMIC: COSV100632683; COSMIC: COSV100632683;