rs201135309

Positions:

• chr19-55145527-A-C

Variant summary

Our verdict is Benign. Variant got -16 ACMG points: 0P and 16B. BP4_Strong BP6_Very_Strong BS2

The NM_003283.6(TNNT1):​c.128+17T>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00161 in 1,613,430 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.00098 (0 hom., cov: 30)
  • Exomes 𝑓: 0.0017 (2 hom.)
• Consequence: TNNT1 NM_003283.6 intron
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: -0.442

Genes affected

TNNT1 (HGNC:11948): (troponin T1, slow skeletal type) This gene encodes a protein that is a subunit of troponin, which is a regulatory complex located on the thin filament of the sarcomere. This complex regulates striated muscle contraction in response to fluctuations in intracellular calcium concentration. This complex is composed of three subunits: troponin C, which binds calcium, troponin T, which binds tropomyosin, and troponin I, which is an inhibitory subunit. This protein is the slow skeletal troponin T subunit. Mutations in this gene cause nemaline myopathy type 5, also known as Amish nemaline myopathy, a neuromuscular disorder characterized by muscle weakness and rod-shaped, or nemaline, inclusions in skeletal muscle fibers which affects infants, resulting in death due to respiratory insufficiency, usually in the second year. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -16 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).
• BP6: Variant 19-55145527-A-C is Benign according to our data. Variant chr19-55145527-A-C is described in ClinVar as [Likely_benign]. Clinvar id is 259029.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr19-55145527-A-C is described in Lovd as [Likely_benign].
• BS2: High Homozygotes in GnomAdExome4 at 2 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TNNT1	NM_003283.6	c.128+17T>G		intron_variant		ENST00000588981.6	NP_003274.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TNNT1	ENST00000588981.6	c.128+17T>G		intron_variant		1	NM_003283.6	ENSP00000467176

Frequencies

GnomAD3 genomes AF: 0.000980 AC: 149 AN: 152038 Hom.: 0 Cov.: 30

Gnomad AFR AF: 0.000411

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00183

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000377

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00144

Gnomad OTH AF: 0.000957

GnomAD3 exomes AF: 0.000833 AC: 209 AN: 250992 Hom.: 0 AF XY: 0.000833 AC XY: 113 AN XY: 135632

Gnomad AFR exome AF: 0.000800

Gnomad AMR exome AF: 0.000840

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000163

Gnomad FIN exome AF: 0.000139

Gnomad NFE exome AF: 0.00133

Gnomad OTH exome AF: 0.00131

GnomAD4 exome AF: 0.00168 AC: 2451 AN: 1461274 Hom.: 2 Cov.: 31 AF XY: 0.00155 AC XY: 1129 AN XY: 726966

Gnomad4 AFR exome AF: 0.000388

Gnomad4 AMR exome AF: 0.000828

Gnomad4 ASJ exome AF: 0.000115

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000128

Gnomad4 FIN exome AF: 0.000243

Gnomad4 NFE exome AF: 0.00203

Gnomad4 OTH exome AF: 0.00186

GnomAD4 genome AF: 0.000979 AC: 149 AN: 152156 Hom.: 0 Cov.: 30 AF XY: 0.000954 AC XY: 71 AN XY: 74400

Gnomad4 AFR AF: 0.000410

Gnomad4 AMR AF: 0.00183

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.000377

Gnomad4 NFE AF: 0.00144

Gnomad4 OTH AF: 0.000947

Alfa AF: 0.000940 Hom.: 0

Bravo AF: 0.000990

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:2

Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Jul 18, 2017	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Likely benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -

Nemaline myopathy 5 Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 31, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	2.0
DANN	Benign	0.65

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

Publications

LitVar

Other links and lift over

dbSNP: rs201135309; hg19: chr19-55656895;