6-33189322-G-A

Position:

• chr6-33189322-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP2 PP3

The NM_080680.3(COL11A2):​c.230C>T​(p.Pro77Leu) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P77Q) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: COL11A2 NM_080680.3 missense, splice_region
• Scores: Splicing: ADA: 0.9969
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.97

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 Uncertain_significance. Variant got 4 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.
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL11A2	NM_080680.3	c.230C>T	p.Pro77Leu	missense_variant, splice_region_variant	2/66	ENST00000341947.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL11A2	ENST00000341947.7	c.230C>T	p.Pro77Leu	missense_variant, splice_region_variant	2/66	5	NM_080680.3	P4
COL11A2	ENST00000395194.1	c.230C>T	p.Pro77Leu	missense_variant, splice_region_variant	2/5	1
COL11A2	ENST00000374708.8	c.230C>T	p.Pro77Leu	missense_variant, splice_region_variant	2/64	5		A1
COL11A2	ENST00000682718.1	n.47C>T		splice_region_variant, non_coding_transcript_exon_variant	1/6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Uncertain	0.036	T
BayesDel_noAF	Benign	-0.19
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.10	T;T;.;T;.
Eigen	Uncertain	0.58
Eigen_PC	Uncertain	0.56
FATHMM_MKL	Uncertain	0.97	D
M_CAP	Benign	0.034	D
MetaRNN	Pathogenic	0.79	D;D;D;D;D
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.3	.;.;.;.;M
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.74	T
PROVEAN	Pathogenic	-7.1	D;D;D;D;D
REVEL	Benign	0.29
Sift	Uncertain	0.015	D;D;D;D;D
Sift4G	Pathogenic	0.0010	D;D;D;D;D
Vest4		0.66
MutPred		0.62		Loss of disorder (P = 0.0358);Loss of disorder (P = 0.0358);Loss of disorder (P = 0.0358);Loss of disorder (P = 0.0358);Loss of disorder (P = 0.0358);
MVP		0.58
MPC		0.61
ClinPred		0.93	D
GERP RS		4.2
gMVP		0.51

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.91
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: rs35765893; hg19: chr6-33157099;