6-33173092-G-T

Position:

• chr6-33173092-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_080680.3(COL11A2):​c.2758C>A​(p.Pro920Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: COL11A2 NM_080680.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.82

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 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), COL11A2. . Gene score misZ 2.3685 (greater than the threshold 3.09). Trascript score misZ 3.3886 (greater than threshold 3.09). GenCC has associacion of gene with otospondylomegaepiphyseal dysplasia, autosomal dominant nonsyndromic hearing loss 13, autosomal dominant nonsyndromic hearing loss, autosomal recessive nonsyndromic hearing loss 53, otospondylomegaepiphyseal dysplasia, autosomal dominant, nonsyndromic genetic hearing loss, fibrochondrogenesis, hearing loss, autosomal recessive, otospondylomegaepiphyseal dysplasia, autosomal recessive.
• BP4: Computational evidence support a benign effect (MetaRNN=0.39453134).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
COL11A2	NM_080680.3	c.2758C>A	p.Pro920Thr	missense_variant	38/66	ENST00000341947.7	NP_542411.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COL11A2	ENST00000341947.7	c.2758C>A	p.Pro920Thr	missense_variant	38/66	5	NM_080680.3	ENSP00000339915.2
COL11A2	ENST00000374708.8	c.2500C>A	p.Pro834Thr	missense_variant	36/64	5		ENSP00000363840.4
COL11A2	ENST00000477772.1	n.272+3917C>A		intron_variant		2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Oct 05, 2013

The Pro920Thr variant in COL11A2 has not been reported in individuals with heari ng loss and frequency data from large population studies is insufficient. Comput ational analyses (biochemical amino acid properties, conservation, AlignGVGD, an d PolyPhen2) suggest that the variant may not impact the protein, though this in formation is not predictive enough to rule out pathogenicity. In summary, additi onal data is needed to determine the clinical significance of this variant. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.070
BayesDel_addAF	Benign	-0.066	T
BayesDel_noAF	Benign	-0.33
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.092	T;T;.
Eigen	Uncertain	0.31
Eigen_PC	Uncertain	0.37
FATHMM_MKL	Pathogenic	0.97	D
M_CAP	Benign	0.026	D
MetaRNN	Benign	0.39	T;T;T
MetaSVM	Benign	-0.95	T
PrimateAI	Uncertain	0.70	T
PROVEAN	Pathogenic	-6.2	D;D;D
REVEL	Benign	0.20
Sift	Benign	0.048	D;D;T
Sift4G	Uncertain	0.038	D;D;D
Vest4		0.37
MutPred		0.41		.;Gain of phosphorylation at P920 (P = 0.0087);.;
MVP		0.51
MPC		0.99
ClinPred		0.99	D
GERP RS		4.0
gMVP		0.32

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: rs727502940; hg19: chr6-33140869;