6-33173503-G-C

Variant names:

• chr6-33173503-G-C
• NM_080680.3:c.2681C>G

Variant summary

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

The NM_080680.3(COL11A2):​c.2681C>G​(p.Pro894Arg) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,252 control chromosomes in the GnomAD database, with no homozygous occurrence. 2/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P894L) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 27)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: COL11A2 NM_080680.3 missense, splice_region
• Scores: Splicing: ADA: 0.8878
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.76

Genes affected

COL11A2 (HGNC:2187): (collagen type XI alpha 2 chain) This gene encodes one of the two alpha chains of type XI collagen, a minor fibrillar collagen. It is located on chromosome 6 very close to but separate from the gene for retinoid X receptor beta. Type XI collagen is a heterotrimer but the third alpha chain is a post-translationally modified alpha 1 type II chain. Proteolytic processing of this type XI chain produces PARP, a proline/arginine-rich protein that is an amino terminal domain. Mutations in this gene are associated with type III Stickler syndrome, otospondylomegaepiphyseal dysplasia (OSMED syndrome), Weissenbacher-Zweymuller syndrome, autosomal dominant non-syndromic sensorineural type 13 deafness (DFNA13), and autosomal recessive non-syndromic sensorineural type 53 deafness (DFNB53). Alternative splicing results in multiple transcript variants. A related pseudogene is located nearby on chromosome 6. [provided by RefSeq, Jul 2009]

ACMG classification

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
COL11A2	NM_080680.3	c.2681C>G	p.Pro894Arg	missense_variant, splice_region_variant	Exon 36 of 66	ENST00000341947.7	NP_542411.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL11A2	ENST00000341947.7	c.2681C>G	p.Pro894Arg	missense_variant, splice_region_variant	Exon 36 of 66	5	NM_080680.3	ENSP00000339915.2
COL11A2	ENST00000374708.8	c.2423C>G	p.Pro808Arg	missense_variant, splice_region_variant	Exon 34 of 64	5		ENSP00000363840.4
COL11A2	ENST00000361917.6	c.1253C>G	p.Pro418Arg	missense_variant, splice_region_variant	Exon 23 of 24	5		ENSP00000355123.2
COL11A2	ENST00000477772.1	n.272+3506C>G		intron_variant	Intron 5 of 8	2

Frequencies

GnomAD3 genomes Cov.: 27

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460252 Hom.: 0 Cov.: 41 AF XY: 0.00 AC XY: 0 AN XY: 726348

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: 9.00e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 27

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Sep 01, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. This variant has not been reported in the literature in individuals affected with COL11A2-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces proline, which is neutral and non-polar, with arginine, which is basic and polar, at codon 894 of the COL11A2 protein (p.Pro894Arg). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.38
BayesDel_addAF	Benign	-0.12	T
BayesDel_noAF	Benign	-0.40
CADD	Pathogenic	32
DANN	Uncertain	1.0
DEOGEN2	Benign	0.087	T;T;.
Eigen	Uncertain	0.43
Eigen_PC	Uncertain	0.48
FATHMM_MKL	Pathogenic	0.98	D
M_CAP	Benign	0.076	D
MetaRNN	Uncertain	0.68	D;D;D
MetaSVM	Benign	-0.92	T
PrimateAI	Uncertain	0.76	T
PROVEAN	Pathogenic	-5.8	D;D;D
REVEL	Uncertain	0.32
Sift	Uncertain	0.0040	D;D;D
Sift4G	Uncertain	0.059	T;D;T
Vest4		0.49
MVP		0.20
MPC		1.1
ClinPred		0.99	D
GERP RS		4.0
gMVP		0.27

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.89
dbscSNV1_RF	Pathogenic	0.79
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

No publications associated with this variant yet.

Other links and lift over

hg19: chr6-33141280;