6-75181206-C-T

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BP4_Strong

The NM_004370.6(COL12A1):c.1897G>A(p.Val633Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000398 in 1,507,082 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000058 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000039 ( 0 hom. )

Consequence

COL12A1
NM_004370.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:7

Conservation

PhyloP100: 0.285

Variant links:

Genes affected

COL12A1 (HGNC:2188): (collagen type XII alpha 1 chain) This gene encodes the alpha chain of type XII collagen, a member of the FACIT (fibril-associated collagens with interrupted triple helices) collagen family. Type XII collagen is a homotrimer found in association with type I collagen, an association that is thought to modify the interactions between collagen I fibrils and the surrounding matrix. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Jul 2008]

COL12A1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -4 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.064982414).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL12A1	NM_004370.6 link	c.1897G>A	p.Val633Ile	missense_variant	Exon 11 of 66	ENST00000322507.13	NP_004361.3	Q99715-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL12A1	ENST00000322507.13 link	c.1897G>A	p.Val633Ile	missense_variant	Exon 11 of 66	1	NM_004370.6	ENSP00000325146.8		Q99715-1

Frequencies

GnomAD3 genomes

AF:

0.0000585

AC:

AN:

85522

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000351

Gnomad SAS

AF:

0.000590

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000706

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000610

AC:

AN:

196792

Hom.:

AF XY:

0.0000736

AC XY:

AN XY:

108634

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000476

Gnomad SAS exome

AF:

0.0000433

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000429

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000387

AC:

AN:

1421560

Hom.:

Cov.:

AF XY:

0.0000439

AC XY:

AN XY:

706028

show subpopulations

Gnomad4 AFR exome

AF:

0.0000639

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000256

Gnomad4 SAS exome

AF:

0.000150

Gnomad4 FIN exome

AF:

0.0000192

Gnomad4 NFE exome

AF:

0.0000265

Gnomad4 OTH exome

AF:

0.0000171

GnomAD4 genome

AF:

0.0000585

AC:

AN:

85522

Hom.:

Cov.:

AF XY:

0.0000738

AC XY:

AN XY:

40630

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000351

Gnomad4 SAS

AF:

0.000590

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000706

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000302

ExAC

AF:

0.0000581

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Feb 17, 2022

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Has not been previously published as pathogenic or benign to our knowledge; In silico analysis supports that this missense variant does not alter protein structure/function -

Dec 09, 2019

Revvity Omics, Revvity

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Bethlem myopathy 2;C4225314:Ullrich congenital muscular dystrophy 2

Uncertain:2

May 23, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 20, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces valine, which is neutral and non-polar, with isoleucine, which is neutral and non-polar, at codon 633 of the COL12A1 protein (p.Val633Ile). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with COL12A1-related conditions. ClinVar contains an entry for this variant (Variation ID: 1702595). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt COL12A1 protein function with a negative predictive value of 80%. 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. -

not specified

Uncertain:1

Nov 19, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: COL12A1 c.1897G>A (p.Val633Ile) results in a conservative amino acid change located in the Fibronectin type 3 domain (IPR003961) of the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 6.1e-05 in 196792 control chromosomes. This frequency is not significantly higher than estimated for a pathogenic variant in COL12A1 causing Ullrich congenital muscular dystrophy 2 (6.1e-05 vs 0.0035), allowing no conclusion about variant significance. To our knowledge, no occurrence of c.1897G>A in individuals affected with Ullrich congenital muscular dystrophy 2 and no experimental evidence demonstrating its impact on protein function have been reported. ClinVar contains an entry for this variant (Variation ID: 1702595). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Inborn genetic diseases

Uncertain:1

Mar 22, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1897G>A (p.V633I) alteration is located in exon 11 (coding exon 10) of the COL12A1 gene. This alteration results from a G to A substitution at nucleotide position 1897, causing the valine (V) at amino acid position 633 to be replaced by an isoleucine (I). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

COL12A1-related disorder

Uncertain:1

Oct 17, 2022

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The COL12A1 c.1897G>A variant is predicted to result in the amino acid substitution p.Val633Ile. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.044% of alleles in individuals of East Asian descent in gnomAD (http://gnomad.broadinstitute.org/variant/6-75890922-C-T). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.073

BayesDel_addAF

Benign

-0.077

BayesDel_noAF

Benign

-0.35

CADD

Benign

DANN

Benign

0.87

DEOGEN2

Benign

0.064

T;.;.

Eigen

Benign

-0.38

Eigen_PC

Benign

-0.37

FATHMM_MKL

Benign

0.40

LIST_S2

Benign

0.72

T;T;T

M_CAP

Benign

0.040

MetaRNN

Benign

0.065

T;T;T

MetaSVM

Benign

-0.39

MutationAssessor

Benign

1.5

L;L;.

PrimateAI

Benign

0.30

PROVEAN

Benign

-0.13

N;N;N

REVEL

Benign

0.28

Sift

Benign

0.40

T;T;T

Sift4G

Uncertain

0.0080

D;D;D

Polyphen

0.28

B;.;P

Vest4

0.060

MutPred

0.43

Gain of sheet (P = 0.0085);Gain of sheet (P = 0.0085);Gain of sheet (P = 0.0085);

MVP

0.43

MPC

0.097

ClinPred

0.039

GERP RS

4.8

Varity_R

0.026

gMVP

0.23

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over