rs771757256

Variant names:

• chr2-178661851-A-G
• rs771757256
• NM_001267550.2:c.37202-9T>C

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Moderate BP6_Moderate

The NM_001267550.2(TTN):​c.37202-9T>C variant causes a intron change. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.000014 (0 hom., cov: 18)
  • Exomes 𝑓: 0.000052 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: TTN NM_001267550.2 intron
• Scores: Splicing: ADA: 0.01642
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 5.97
• Publications: 0 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]

LOC124906100 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.26).
• BP6: Variant 2-178661851-A-G is Benign according to our data. Variant chr2-178661851-A-G is described in ClinVar as [Likely_benign]. Clinvar id is 413222.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TTN	NM_001267550.2	c.37202-9T>C		intron_variant	Intron 179 of 362	ENST00000589042.5	NP_001254479.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TTN	ENST00000589042.5	c.37202-9T>C		intron_variant	Intron 179 of 362	5	NM_001267550.2	ENSP00000467141.1

Frequencies

GnomAD3 genomes AF: 0.0000138 AC: 2 AN: 145178 Hom.: 0 Cov.: 18

Gnomad AFR AF: 0.0000263

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: 0.0000150

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000432 AC: 10 AN: 231726 AF XY: 0.0000315

Gnomad AFR exome AF: 0.0000743

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000855

Gnomad OTH exome AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.0000524 AC: 76 AN: 1451056 Hom.: 0 Cov.: 31 AF XY: 0.0000582 AC XY: 42 AN XY: 721910

African (AFR) AF: 0.00 AC: 0 AN: 32226

American (AMR) AF: 0.00 AC: 0 AN: 43084

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25592

East Asian (EAS) AF: 0.00 AC: 0 AN: 39564

South Asian (SAS) AF: 0.00 AC: 0 AN: 85042

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52680

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4506

European-Non Finnish (NFE) AF: 0.0000658 AC: 73 AN: 1108722

Other (OTH) AF: 0.0000503 AC: 3 AN: 59640

GnomAD4 genome Data not reliable, filtered out with message: AS_VQSR AF: 0.0000138 AC: 2 AN: 145178 Hom.: 0 Cov.: 18 AF XY: 0.0000142 AC XY: 1 AN XY: 70598

African (AFR) AF: 0.0000263 AC: 1 AN: 37956

American (AMR) AF: 0.00 AC: 0 AN: 14740

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3410

East Asian (EAS) AF: 0.00 AC: 0 AN: 4890

South Asian (SAS) AF: 0.00 AC: 0 AN: 4502

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10010

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 300

European-Non Finnish (NFE) AF: 0.0000150 AC: 1 AN: 66488

Other (OTH) AF: 0.00 AC: 0 AN: 1972

Alfa AF: 0.00 Hom.: 0

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Autosomal recessive limb-girdle muscular dystrophy type 2J;C1858763:Dilated cardiomyopathy 1G Benign:1

Dec 11, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.26
CADD	Benign	19
DANN	Benign	0.91
PhyloP100		6.0
Mutation Taster		=88/12	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.016
dbscSNV1_RF	Benign	0.12
SpliceAI score (max)		0.21		Details are displayed if max score is > 0.2
DS_AL_spliceai		0.21		Position offset: -9

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

Other links and lift over

dbSNP: rs771757256; hg19: chr2-179526578;