11-67418899-C-T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001166222.2(CARNS1):c.508C>T(p.Arg170Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000558 in 1,595,282 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000055 ( 0 hom. )

Consequence

CARNS1
NM_001166222.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.63

Variant links:

Genes affected

CARNS1 (HGNC:29268): (carnosine synthase 1) CARNS1 (EC 6.3.2.11), a member of the ATP-grasp family of ATPases, catalyzes the formation of carnosine (beta-alanyl-L-histidine) and homocarnosine (gamma-aminobutyryl-L-histidine), which are found mainly in skeletal muscle and the central nervous system, respectively (Drozak et al., 2010 [PubMed 20097752]).[supplied by OMIM, Apr 2010]

CARNS1 links:

PPP1CA (HGNC:9281): (protein phosphatase 1 catalytic subunit alpha) The protein encoded by this gene is one of the three catalytic subunits of protein phosphatase 1 (PP1). This broadly expressed gene encodes the alpha subunit of the PP1 complex that associates with over 200 regulatory proteins to form holoenzymes which dephosphorylate their biological targets with high specificity. PP1 is a serine/threonine specific protein phosphatase known to be involved in the regulation of a variety of cellular processes, such as cell division, glycogen metabolism, muscle contractility, protein synthesis, and HIV-1 viral transcription. Increased PP1 activity has been observed in the end stage of heart failure. Studies suggest that PP1 is an important regulator of cardiac function and that PP1 deregulation is implicated in diabetes and multiple types of cancer. Three alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2020]

PPP1CA links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CARNS1	NM_001166222.2 link	c.508C>T	p.Arg170Cys	missense_variant	Exon 5 of 10	ENST00000687366.1	NP_001159694.1	A5YM72-5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CARNS1	ENST00000687366.1 link	c.508C>T	p.Arg170Cys	missense_variant	Exon 5 of 10		NM_001166222.2	ENSP00000510668.1		A5YM72-5

Frequencies

GnomAD3 genomes

AF:

0.0000657

AC:

AN:

152246

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000392

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0000941

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000560

AC:

AN:

214454

Hom.:

AF XY:

0.0000342

AC XY:

AN XY:

116964

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000191

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000368

Gnomad FIN exome

AF:

0.000108

Gnomad NFE exome

AF:

0.0000318

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000547

AC:

AN:

1443036

Hom.:

Cov.:

AF XY:

0.0000475

AC XY:

AN XY:

716352

show subpopulations

Gnomad4 AFR exome

AF:

0.0000303

Gnomad4 AMR exome

AF:

0.000165

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000239

Gnomad4 FIN exome

AF:

0.0000585

Gnomad4 NFE exome

AF:

0.0000562

Gnomad4 OTH exome

AF:

0.0000671

GnomAD4 genome

AF:

0.0000657

AC:

AN:

152246

Hom.:

Cov.:

AF XY:

0.0000807

AC XY:

AN XY:

74374

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.000392

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.0000941

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000329

Hom.:

Bravo

AF:

0.000136

ExAC

AF:

0.0000167

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Mar 01, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.508C>T (p.R170C) alteration is located in exon 5 (coding exon 4) of the CARNS1 gene. This alteration results from a C to T substitution at nucleotide position 508, causing the arginine (R) at amino acid position 170 to be replaced by a cysteine (C). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.27

BayesDel_addAF

Benign

-0.085

BayesDel_noAF

Benign

-0.10

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.023

.;T;.

Eigen

Uncertain

0.23

Eigen_PC

Benign

0.16

FATHMM_MKL

Uncertain

0.77

LIST_S2

Uncertain

0.91

D;D;D

M_CAP

Uncertain

0.11

MetaRNN

Uncertain

0.68

D;D;D

MetaSVM

Benign

-0.47

MutationAssessor

Benign

0.81

.;L;.

PrimateAI

Uncertain

0.73

PROVEAN

Uncertain

-3.5

D;D;D

REVEL

Uncertain

0.31

Sift

Pathogenic

0.0

D;D;D

Sift4G

Pathogenic

0.0

D;D;D

Polyphen

1.0

.;D;.

Vest4

0.86

MutPred

0.48

.;Gain of catalytic residue at R47 (P = 0.0085);.;

MVP

0.67

MPC

0.58

ClinPred

0.75

GERP RS

4.0

Varity_R

0.26

gMVP

0.68

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.060

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over