rs121912950

Positions:

• chr6-33167305-G-A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_080680.3(COL11A2):​c.4135C>T​(p.Arg1379Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,536 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: COL11A2 NM_080680.3 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: 2.14

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 Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 6-33167305-G-A is Pathogenic according to our data. Variant chr6-33167305-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 17127.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr6-33167305-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
COL11A2	NM_080680.3	c.4135C>T	p.Arg1379Ter	stop_gained	57/66	ENST00000341947.7	NP_542411.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COL11A2	ENST00000341947.7	c.4135C>T	p.Arg1379Ter	stop_gained	57/66	5	NM_080680.3	ENSP00000339915	P4
COL11A2	ENST00000374708.8	c.3877C>T	p.Arg1293Ter	stop_gained	55/64	5		ENSP00000363840	A1
COL11A2	ENST00000683572.1	n.102C>T		non_coding_transcript_exon_variant	2/9
COL11A2	ENST00000477772.1	n.273-1489C>T		intron_variant, non_coding_transcript_variant		2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461536 Hom.: 0 Cov.: 36 AF XY: 0.00000138 AC XY: 1 AN XY: 727048

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: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Mar 15, 2024	Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 26969326, 25525159, 15372529, 33597575) -
Pathogenic, criteria provided, single submitter	clinical testing	Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen	Oct 23, 2020	- -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Nov 15, 2022	For these reasons, this variant has been classified as Pathogenic. Studies have shown that this premature translational stop signal results in skipping of exon 57, but is expected to preserve the integrity of the reading-frame (PMID: 15372529). ClinVar contains an entry for this variant (Variation ID: 17127). This variant is also known as Arg1272Stop or Arg893Stop. This premature translational stop signal has been observed in individual(s) with clinical features of non-ocular Stickler syndrome and deafness (PMID: 15372529, 26969326; Invitae). In at least one individual the variant was observed to be de novo. 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 creates a premature translational stop signal (p.Arg1379*) in the COL11A2 gene. RNA analysis indicates that this premature translational stop signal induces altered splicing and likely results in a shortened protein product. -

Otospondylomegaepiphyseal dysplasia, autosomal dominant Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Institute for Medical Genetics and Human Genetics, Charité - Universitätsmedizin Berlin	Sep 16, 2022	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Oct 01, 2004	- -

COL11A2-related disorder Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

May 31, 2024

The COL11A2 c.4135C>T variant is predicted to result in premature protein termination (p.Arg1379*). This variant was reported in the heterozygous state in an individual who underwent genetic testing for hearing loss (P97 in Wang et al. 2021. PubMed ID: 33597575) and in one patient with Stickler syndrome (P40 in Sloan-Heggen et al. 2016. PubMed ID: 26969326). This variant has not been reported in a large population database (http://gnomad.broadinstitute.org), indicating this variant is rare. Nonsense variants in COL11A2 are expected to be pathogenic. This variant is interpreted as pathogenic. -

Autosomal dominant nonsyndromic hearing loss 13 Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Molecular Diagnostics Laboratory, M Health Fairview: University of Minnesota

May 05, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.68	D
BayesDel_noAF	Pathogenic	0.58
CADD	Pathogenic	41
DANN	Uncertain	1.0
Eigen	Uncertain	0.61
Eigen_PC	Uncertain	0.38
FATHMM_MKL	Benign	0.39	N
MutationTaster	Benign	1.0	A;A;A;A;A;A;A;A
Vest4		0.79
GERP RS		4.2

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

Other links and lift over

dbSNP: rs121912950; hg19: chr6-33135082;