rs121913568

Positions:

• chr15-88872038-G-A

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM2 PP3_Moderate PP5_Very_Strong

The NM_001369268.1(ACAN):​c.7255G>A​(p.Asp2419Asn) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: ACAN NM_001369268.1 missense
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 9.89

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]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.909
• PP5: Variant 15-88872038-G-A is Pathogenic according to our data. Variant chr15-88872038-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 14305.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ACAN	NM_001369268.1	c.7255G>A	p.Asp2419Asn	missense_variant	16/19	ENST00000560601.4	NP_001356197.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ACAN	ENST00000560601.4	c.7255G>A	p.Asp2419Asn	missense_variant	16/19	3	NM_001369268.1	ENSP00000453581.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Short stature and advanced bone age, with or without early-onset osteoarthritis and/or osteochondritis dissecans Pathogenic:2

Likely pathogenic, no assertion criteria provided	clinical testing	Autoinflammatory diseases unit, CHU de Montpellier	Mar 29, 2024	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Mendelics	May 04, 2022	- -

Spondyloepimetaphyseal dysplasia, aggrecan type Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Jan 01, 2009

- -

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 03, 2022

In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. Experimental studies have shown that this missense change affects ACAN function (PMID: 19110214). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C15"). ClinVar contains an entry for this variant (Variation ID: 14305). This variant is also known as c.6799G>A (p.D2267N). This missense change has been observed in individual(s) with autosomal recessive spondyloepimetaphyseal dysplasia (PMID: 19110214). It has also been observed to segregate with disease in related individuals. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces aspartic acid, which is acidic and polar, with asparagine, which is neutral and polar, at codon 2381 of the ACAN protein (p.Asp2381Asn). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.88
BayesDel_addAF	Benign	-0.12	T
BayesDel_noAF	Benign	-0.41
CADD	Pathogenic	33
DANN	Pathogenic	1.0
Eigen	Pathogenic	0.97
Eigen_PC	Pathogenic	0.94
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.96	D;D;D;D;D;.
M_CAP	Benign	0.018	T
MetaRNN	Pathogenic	0.91	D;D;D;D;D;D
MetaSVM	Benign	-0.76	T
PrimateAI	Uncertain	0.62	T
PROVEAN	Pathogenic	-4.5	.;D;.;D;D;D
REVEL	Uncertain	0.44
Sift	Pathogenic	0.0	.;D;.;D;D;D
Sift4G	Pathogenic	0.0	.;D;D;D;D;D
Vest4		0.77, 0.66, 0.84, 0.89
MutPred		0.87		.;Loss of phosphorylation at T2383 (P = 0.1046);.;.;.;Loss of phosphorylation at T2383 (P = 0.1046);
MVP		0.84
MPC		0.76
ClinPred		1.0	D
GERP RS		5.7
Varity_R		0.66
gMVP		0.91

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		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: rs121913568; hg19: chr15-89415269;