chr6-33174020-C-T

Variant names:

• chr6-33174020-C-T
• rs117237998
• NM_080680.3:c.2520G>A

Variant summary

Our verdict is Benign. The variant received -19 ACMG points: 0P and 19B. BP4_Moderate BP6_Very_Strong BP7 BS1 BS2

The NM_080680.3(COL11A2):​c.2520G>A​(p.Arg840Arg) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00202 in 1,613,972 control chromosomes in the GnomAD database, including 232 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. R840R) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.0029 (23 hom., cov: 32)
  • Exomes 𝑓: 0.0019 (209 hom.)
• Consequence: COL11A2 NM_080680.3 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:12
• Conservation: PhyloP100: -0.633
• Publications: 3 publications found

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]

COL11A2 Gene-Disease associations (from GenCC):

• autosomal dominant nonsyndromic hearing loss 13

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, LIMITED Submitted by: Ambry Genetics, PanelApp Australia, Labcorp Genetics (formerly Invitae), G2P
• nonsyndromic genetic hearing loss

  Inheritance: AD, AR Classification: DEFINITIVE, MODERATE Submitted by: ClinGen
• otospondylomegaepiphyseal dysplasia, autosomal dominant

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: PanelApp Australia, Ambry Genetics, Orphanet, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), G2P
• autosomal recessive nonsyndromic hearing loss 53

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: G2P, PanelApp Australia, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• otospondylomegaepiphyseal dysplasia

  Inheritance: AR, AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
• otospondylomegaepiphyseal dysplasia, autosomal recessive

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: PanelApp Australia, Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
• autosomal dominant nonsyndromic hearing loss

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• fibrochondrogenesis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hearing loss, autosomal recessive

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Benign. The variant received -19 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.3).
• BP6: Variant 6-33174020-C-T is Benign according to our data. Variant chr6-33174020-C-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 46559.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=-0.633 with no splicing effect.
• BS1: Variant frequency is greater than expected in population eas. GnomAd4 allele frequency = 0.00294 (447/152170) while in subpopulation EAS AF = 0.0518 (267/5154). AF 95% confidence interval is 0.0467. There are 23 homozygotes in GnomAd4. There are 252 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 23 AD,AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_080680.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL11A2	NM_080680.3	MANE Select	c.2520G>A	p.Arg840Arg	synonymous	Exon 33 of 66	NP_542411.2
	COL11A2	NM_001424108.1		c.2340G>A	p.Arg780Arg	synonymous	Exon 32 of 65	NP_001411037.1
	COL11A2	NM_080681.3		c.2262G>A	p.Arg754Arg	synonymous	Exon 31 of 64	NP_542412.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL11A2	ENST00000341947.7	TSL:5 MANE Select	c.2520G>A	p.Arg840Arg	synonymous	Exon 33 of 66	ENSP00000339915.2
	COL11A2	ENST00000374708.8	TSL:5	c.2262G>A	p.Arg754Arg	synonymous	Exon 31 of 64	ENSP00000363840.4
	COL11A2	ENST00000361917.6	TSL:5	c.1092G>A	p.Arg364Arg	synonymous	Exon 20 of 24	ENSP00000355123.2

Frequencies

GnomAD3 genomes AF: 0.00297 AC: 451 AN: 152052 Hom.: 24 Cov.: 32

Gnomad AFR AF: 0.000918

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00111

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.0523

Gnomad SAS AF: 0.0234

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.00527

GnomAD2 exomes AF: 0.00523 AC: 1312 AN: 250890 AF XY: 0.00518

Gnomad AFR exome AF: 0.000804

Gnomad AMR exome AF: 0.000636

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0518

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000265

Gnomad OTH exome AF: 0.00604

GnomAD4 exome AF: 0.00192 AC: 2807 AN: 1461802 Hom.: 209 Cov.: 37 AF XY: 0.00199 AC XY: 1450 AN XY: 727210

African (AFR) AF: 0.000388 AC: 13 AN: 33480

American (AMR) AF: 0.000537 AC: 24 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.0269 AC: 1066 AN: 39700

South Asian (SAS) AF: 0.00963 AC: 831 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53348

Middle Eastern (MID) AF: 0.000347 AC: 2 AN: 5768

European-Non Finnish (NFE) AF: 0.0000189 AC: 21 AN: 1111998

Other (OTH) AF: 0.0141 AC: 850 AN: 60394

GnomAD4 genome AF: 0.00294 AC: 447 AN: 152170 Hom.: 23 Cov.: 32 AF XY: 0.00339 AC XY: 252 AN XY: 74392

African (AFR) AF: 0.000916 AC: 38 AN: 41504

American (AMR) AF: 0.00111 AC: 17 AN: 15304

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.0518 AC: 267 AN: 5154

South Asian (SAS) AF: 0.0232 AC: 112 AN: 4820

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10610

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.0000294 AC: 2 AN: 67990

Other (OTH) AF: 0.00521 AC: 11 AN: 2110

Alfa AF: 0.000422 Hom.: 0

Bravo AF: 0.00272

Asia WGS AF: 0.0500 AC: 175 AN: 3478

EpiCase AF: 0.0000545

EpiControl AF: 0.0000593

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:12

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:4

Breakthrough Genomics, Breakthrough Genomics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: not provided

Feb 01, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

May 15, 2019

Athena Diagnostics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Nov 03, 2023

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

not specified Benign:3

May 07, 2012

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Arg840Arg in Exon 33 of COL11A2: This variant is not expected to have clinical significance because it does not alter an amino acid residue, is not located wit hin the splice consensus sequence, and has been identified in 5.0% (6/120) of ch romosomes from a population in the dbSNP database (http://www.ncbi.nlm.nih.gov/p rojects/SNP; rs117237998).

Jun 15, 2017

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease.

Oct 20, 2014

Eurofins Ntd Llc (ga)

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Otospondylomegaepiphyseal dysplasia, autosomal dominant Benign:1

Jun 14, 2016

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Otospondylomegaepiphyseal dysplasia, autosomal recessive Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease.

Stickler Syndrome, Dominant Benign:1

Jun 14, 2016

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Fibrochondrogenesis 2 Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease.

Connective tissue disorder Benign:1

Jun 30, 2022

Genome Diagnostics Laboratory, The Hospital for Sick Children

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.30
CADD	Benign	8.2
DANN	Benign	0.70
PhyloP100		-0.63
Mutation Taster		=100/0	polymorphism (auto)

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

Other links and lift over

dbSNP: rs117237998; hg19: chr6-33141797; COSMIC: COSV59497427; COSMIC: COSV59497427;