Genetic Variant CARNS1:p.Ala152Ser (chr11-67418845-G-T) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_001166222.2(CARNS1):c.454G>T(p.Ala152Ser) variant causes a missense change. The variant allele was found at a frequency of 0.0000131 in 1,448,692 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.000013 ( 0 hom. )

Consequence

CARNS1
NM_001166222.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 6.71

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:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.18031338).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CARNS1	NM_001166222.2 link	c.454G>T	p.Ala152Ser	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.454G>T	p.Ala152Ser	missense_variant	Exon 5 of 10		NM_001166222.2	ENSP00000510668.1		A5YM72-5

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000712

AC:

AN:

224804

Hom.:

AF XY:

0.0000326

AC XY:

AN XY:

122716

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000496

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000131

AC:

AN:

1448692

Hom.:

Cov.:

AF XY:

0.00000834

AC XY:

AN XY:

719660

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000442

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Bravo

AF:

0.0000491

ExAC

AF:

0.0000415

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jan 23, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.454G>T (p.A152S) alteration is located in exon 5 (coding exon 4) of the CARNS1 gene. This alteration results from a G to T substitution at nucleotide position 454, causing the alanine (A) at amino acid position 152 to be replaced by a serine (S). 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

Uncertain

0.44

BayesDel_addAF

Benign

-0.31

BayesDel_noAF

Benign

-0.33

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Benign

0.013

.;T;.

Eigen

Uncertain

0.44

Eigen_PC

Uncertain

0.45

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.80

T;T;T

M_CAP

Benign

0.031

MetaRNN

Benign

0.18

T;T;T

MetaSVM

Benign

-0.71

MutationAssessor

Benign

0.81

.;L;.

PrimateAI

Uncertain

0.71

PROVEAN

Benign

-1.1

N;N;N

REVEL

Benign

0.20

Sift

Uncertain

0.0030

D;D;D

Sift4G

Uncertain

0.027

D;D;D

Polyphen

0.96

.;P;.

Vest4

0.58

MutPred

0.55

.;Gain of sheet (P = 0.0344);.;

MVP

0.68

MPC

0.47

ClinPred

0.21

GERP RS

4.0

Varity_R

0.15

gMVP

0.50

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

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