6-33175679-G-A

Variant names:

• chr6-33175679-G-A
• rs745568808
• NM_080680.3:c.2271C>T

Variant summary

Our verdict is Benign. The variant received -10 ACMG points: 0P and 10B. BP4_Strong BP6 BP7 BS1

The NM_080680.3(COL11A2):​c.2271C>T​(p.Gly757Gly) variant causes a splice region, synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000169 in 1,612,734 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 1/1 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.000059 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00018 (0 hom.)
• Consequence: COL11A2 NM_080680.3 splice_region, synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4 B:5
• Conservation: PhyloP100: -0.879
• Publications: 0 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, LIMITED Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
• otospondylomegaepiphyseal dysplasia, autosomal dominant

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

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

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

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

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• 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 -10 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.63).
• BP6: Variant 6-33175679-G-A is Benign according to our data. Variant chr6-33175679-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 356400.
• BP7: Synonymous conserved (PhyloP=-0.879 with no splicing effect.
• BS1: Variant frequency is greater than expected in population nfe. GnomAdExome4 allele frequency = 0.000181 (264/1460616) while in subpopulation NFE AF = 0.000219 (244/1111880). AF 95% confidence interval is 0.000196. There are 0 homozygotes in GnomAdExome4. There are 116 alleles in the male GnomAdExome4 subpopulation. Median coverage is 31. This position passed quality control check.

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL11A2	NM_080680.3	MANE Select	c.2271C>T	p.Gly757Gly	splice_region synonymous	Exon 30 of 66	NP_542411.2	A0A0C4DFS1
	COL11A2	NM_001424108.1		c.2091C>T	p.Gly697Gly	splice_region synonymous	Exon 29 of 65	NP_001411037.1
	COL11A2	NM_080681.3		c.2013C>T	p.Gly671Gly	splice_region synonymous	Exon 28 of 64	NP_542412.2	Q4VXY6

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL11A2	ENST00000341947.7	TSL:5 MANE Select	c.2271C>T	p.Gly757Gly	splice_region synonymous	Exon 30 of 66	ENSP00000339915.2	A0A0C4DFS1
	COL11A2	ENST00000930122.1		c.2091C>T	p.Gly697Gly	splice_region synonymous	Exon 29 of 65	ENSP00000600181.1
	COL11A2	ENST00000374708.8	TSL:5	c.2013C>T	p.Gly671Gly	splice_region synonymous	Exon 28 of 64	ENSP00000363840.4	Q4VXY6

Frequencies

GnomAD3 genomes AF: 0.0000592 AC: 9 AN: 152118 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000103

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000528 AC: 13 AN: 246292 AF XY: 0.0000596

Gnomad AFR exome AF: 0.0000662

Gnomad AMR exome AF: 0.0000870

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000725

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000181 AC: 264 AN: 1460616 Hom.: 0 Cov.: 31 AF XY: 0.000160 AC XY: 116 AN XY: 726636

African (AFR) AF: 0.0000896 AC: 3 AN: 33480

American (AMR) AF: 0.0000894 AC: 4 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26134

East Asian (EAS) AF: 0.0000504 AC: 2 AN: 39700

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86252

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52294

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.000219 AC: 244 AN: 1111880

Other (OTH) AF: 0.000166 AC: 10 AN: 60384

GnomAD4 genome AF: 0.0000592 AC: 9 AN: 152118 Hom.: 0 Cov.: 32 AF XY: 0.0000942 AC XY: 7 AN XY: 74312

African (AFR) AF: 0.0000483 AC: 2 AN: 41420

American (AMR) AF: 0.00 AC: 0 AN: 15280

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5188

South Asian (SAS) AF: 0.00 AC: 0 AN: 4824

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10612

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.000103 AC: 7 AN: 68006

Other (OTH) AF: 0.00 AC: 0 AN: 2090

Alfa AF: 0.000113 Hom.: 0

Bravo AF: 0.0000642

EpiCase AF: 0.000436

EpiControl AF: 0.00

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	-	3	not provided (3)
-	-	1	COL11A2-related disorder (1)
-	-	1	Connective tissue disorder (1)
-	1	-	Fibrochondrogenesis 2 (1)
-	1	-	Otospondylomegaepiphyseal dysplasia, autosomal dominant (1)
-	1	-	Otospondylomegaepiphyseal dysplasia, autosomal recessive (1)
-	1	-	Stickler Syndrome, Dominant (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.63
CADD	Benign	2.1
DANN	Benign	0.63
PhyloP100		-0.88
Mutation Taster		=94/6	polymorphism

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: rs745568808; hg19: chr6-33143456;