Genetic Variant ACAN:p.Ala16Val (chr15-88836253-C-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_001369268.1(ACAN):c.47C>T(p.Ala16Val) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,544 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: 6.8e-7 ( 0 hom. )

Consequence

ACAN
NM_001369268.1 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.37

Variant links:

Genes affected

ACAN (HGNC:319): (aggrecan) This gene is a member of the aggrecan/versican proteoglycan family. The encoded protein is an integral part of the extracellular matrix in cartilagenous tissue and it withstands compression in cartilage. Mutations in this gene may be involved in skeletal dysplasia and spinal degeneration. Multiple alternatively spliced transcript variants that encode different protein isoforms have been observed in this gene. [provided by RefSeq, Jul 2008]

ACAN 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=0.21034735).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ACAN	NM_001369268.1 link	c.47C>T	p.Ala16Val	missense_variant	Exon 2 of 19	ENST00000560601.4	NP_001356197.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ACAN	ENST00000560601.4 link	c.47C>T	p.Ala16Val	missense_variant	Exon 2 of 19	3	NM_001369268.1	ENSP00000453581.2		H0YMF1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000401

AC:

AN:

249074

Hom.:

AF XY:

0.00000740

AC XY:

AN XY:

135116

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

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:

0.00000885

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461544

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727042

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

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:

8.99e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Jun 10, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 16 of the ACAN protein (p.Ala16Val). This variant is present in population databases (no rsID available, gnomAD 0.0009%). This variant has not been reported in the literature in individuals affected with ACAN-related conditions. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt ACAN protein function with a negative predictive value of 80%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.47

BayesDel_addAF

Benign

-0.084

BayesDel_noAF

Benign

-0.36

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.24

.;T;.;T;.;.;T

Eigen

Benign

0.17

Eigen_PC

Benign

0.12

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.91

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

M_CAP

Benign

0.016

MetaRNN

Benign

0.21

T;T;T;T;T;T;T

MetaSVM

Benign

-1.1

MutationAssessor

Pathogenic

3.0

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

PrimateAI

Uncertain

0.51

PROVEAN

Uncertain

-2.5

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

REVEL

Benign

0.16

Sift

Uncertain

0.011

.;D;.;T;D;D;D

Sift4G

Benign

0.14

.;T;T;T;T;T;T

Polyphen

0.021

.;.;.;B;.;.;.

Vest4

0.54, 0.55, 0.60, 0.56, 0.49, 0.53

MutPred

0.30

Loss of loop (P = 0.0804);Loss of loop (P = 0.0804);Loss of loop (P = 0.0804);Loss of loop (P = 0.0804);Loss of loop (P = 0.0804);Loss of loop (P = 0.0804);Loss of loop (P = 0.0804);

MVP

0.068

MPC

0.20

ClinPred

0.82

GERP RS

5.3

Varity_R

0.20

gMVP

0.49

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

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