Genetic Variant TNNI1:p.Arg48Gly (chr1-201414565-G-C) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_003281.4(TNNI1):c.142C>G(p.Arg48Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,460,926 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R48C) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

TNNI1
NM_003281.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 2.99

Publications

4 publications found

Variant links:

Genes affected

TNNI1 (HGNC:11945): (troponin I1, slow skeletal type) Troponin proteins associate with tropomyosin and regulate the calcium sensitivity of the myofibril contractile apparatus of striated muscles. Troponin I (TnI), along with troponin T (TnT) and troponin C (TnC), is one of 3 subunits that form the troponin complex of the thin filaments of striated muscle. TnI is the inhibitory subunit; blocking actin-myosin interactions and thereby mediating striated muscle relaxation. The TnI subfamily contains three genes: TnI-skeletal-fast-twitch, TnI-skeletal-slow-twitch, and TnI-cardiac. The TnI-fast and TnI-slow genes are expressed in fast-twitch and slow-twitch skeletal muscle fibers, respectively, while the TnI-cardiac gene is expressed exclusively in cardiac muscle tissue. This gene encodes the Troponin-I-skeletal-slow-twitch protein. This gene is expressed in cardiac and skeletal muscle during early development but is restricted to slow-twitch skeletal muscle fibers in adults. The encoded protein prevents muscle contraction by inhibiting calcium-mediated conformational changes in actin-myosin complexes. [provided by RefSeq, Jul 2008]

TNNI1 links:

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ACMG classification

Classification was made for transcript

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

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.86

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TNNI1	NM_003281.4 link	c.142C>G	p.Arg48Gly	missense_variant	Exon 5 of 9	ENST00000361379.9	NP_003272.3	P19237

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TNNI1	ENST00000361379.9 link	c.142C>G	p.Arg48Gly	missense_variant	Exon 5 of 9	5	NM_003281.4	ENSP00000354488.4		P19237

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1460926

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726770

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33470

American (AMR)

AF:

0.00

AC:

AN:

44674

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26108

East Asian (EAS)

AF:

0.00

AC:

AN:

39690

South Asian (SAS)

AF:

0.00

AC:

AN:

86128

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52918

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5740

European-Non Finnish (NFE)

AF:

0.00000180

AC:

AN:

1111836

Other (OTH)

AF:

0.00

AC:

AN:

60362

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.600

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

ExAC

AF:

0.00000824

AC:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.33

BayesDel_addAF

Pathogenic

0.26

BayesDel_noAF

Uncertain

0.13

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.58

D;D;D;.;D;D;.

Eigen

Uncertain

0.56

Eigen_PC

Uncertain

0.53

FATHMM_MKL

Uncertain

0.92

LIST_S2

Uncertain

0.90

D;.;.;D;D;D;D

M_CAP

Uncertain

0.25

MetaRNN

Pathogenic

0.86

D;D;D;D;D;D;D

MetaSVM

Pathogenic

0.88

MutationAssessor

Uncertain

2.8

.;M;M;.;M;.;.

PhyloP100

3.0

PrimateAI

Uncertain

0.73

PROVEAN

Uncertain

-3.7

.;D;D;D;D;D;D

REVEL

Pathogenic

0.77

Sift

Uncertain

0.0040

.;D;D;D;D;D;D

Sift4G

Uncertain

0.0080

D;D;D;D;D;D;D

Polyphen

0.97

.;D;D;.;D;.;.

Vest4

0.75

MutPred

0.56

Loss of MoRF binding (P = 0.0189);Loss of MoRF binding (P = 0.0189);Loss of MoRF binding (P = 0.0189);Loss of MoRF binding (P = 0.0189);Loss of MoRF binding (P = 0.0189);.;Loss of MoRF binding (P = 0.0189);

MVP

0.99

MPC

1.7

ClinPred

0.99

GERP RS

3.8

Varity_R

0.43

gMVP

0.77

Mutation Taster

=77/23

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.090

Details are displayed if max score is > 0.2

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over