chr6-33163679-T-C

Position:

• chr6-33163679-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PM4

The NM_080680.3(COL11A2):​c.5210A>G​(p.Ter1737Trpext*?) variant causes a stop lost change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: COL11A2 NM_080680.3 stop_lost
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.48

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 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM4: Stoplost variant in NM_080680.3 Downstream stopcodon found after 46 codons.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
COL11A2	NM_080680.3	c.5210A>G	p.Ter1737Trpext*?	stop_lost	66/66	ENST00000341947.7	NP_542411.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COL11A2	ENST00000341947.7	c.5210A>G	p.Ter1737Trpext*?	stop_lost	66/66	5	NM_080680.3	ENSP00000339915.2
COL11A2	ENST00000374708.8	c.4952A>G	p.Ter1651Trpext*?	stop_lost	64/64	5		ENSP00000363840.4
COL11A2	ENST00000477772.1	n.1000A>G		non_coding_transcript_exon_variant	9/9	2
COL11A2	ENST00000683572.1	n.1016A>G		non_coding_transcript_exon_variant	9/9

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000407 AC: 1 AN: 245790 Hom.: 0 AF XY: 0.00000746 AC XY: 1 AN XY: 134020

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000910

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000844 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 23, 2022

This variant has not been reported in the literature in individuals affected with COL11A2-related conditions. This variant is present in population databases (rs778899719, gnomAD 0.0009%). This sequence change disrupts the translational stop signal of the COL11A2 mRNA. It is expected to extend the length of the COL11A2 protein by 79 additional amino acid residues. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Uncertain	0.012	T
BayesDel_noAF	Benign	-0.22
CADD	Benign	15
DANN	Benign	0.61
Eigen	Pathogenic	0.80
Eigen_PC	Uncertain	0.59
FATHMM_MKL	Uncertain	0.87	D
MutationTaster	Benign	1.0	N;N;N;N;N;N;N;N
Vest4		0.20
GERP RS		3.8

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: rs778899719; hg19: chr6-33131456;