Genetic Variant COL12A1:c.9182-99_9182-92delTATATATA (chr6-75086648-GTATATATA-G) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BS1

The NM_004370.6(COL12A1):c.9182-99_9182-92delTATATATA variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000384 in 288,866 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.000056 ( 0 hom., cov: 0)

Exomes 𝑓: 0.00070 ( 0 hom. )

Consequence

COL12A1
NM_004370.6 intron

Scores

Not classified

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.905

Publications

0 publications found

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 Gene-Disease associations (from GenCC):

Bethlem myopathy 2
Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet
Bethlem myopathy 2
Inheritance: AD Classification: STRONG, LIMITED Submitted by: Ambry Genetics, Illumina, Genomics England PanelApp
Ullrich congenital muscular dystrophy 2
Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
Bethlem myopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Ullrich congenital muscular dystrophy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

COL12A1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -4 ACMG points.

BS1

Variant frequency is greater than expected in population eas. GnomAd4 allele frequency = 0.0000565 (8/141668) while in subpopulation EAS AF = 0.00164 (8/4874). AF 95% confidence interval is 0.000816. There are 0 homozygotes in GnomAd4. There are 4 alleles in the male GnomAd4 subpopulation. Median coverage is 0. This position passed quality control check.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL12A1	NM_004370.6 link	c.9182-99_9182-92delTATATATA		intron_variant	Intron 65 of 65	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.9182-99_9182-92delTATATATA		intron_variant	Intron 65 of 65	1	NM_004370.6	ENSP00000325146.8		Q99715-1

Frequencies

GnomAD3 genomes

AF:

0.0000565

AC:

AN:

141672

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:

0.00164

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.000700

AC:

103

AN:

147198

Hom.:

AF XY:

0.000707

AC XY:

AN XY:

82054

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

2548

American (AMR)

AF:

0.000774

AC:

AN:

6462

Ashkenazi Jewish (ASJ)

AF:

0.000937

AC:

AN:

4268

East Asian (EAS)

AF:

0.00364

AC:

AN:

5766

South Asian (SAS)

AF:

0.000702

AC:

AN:

12824

European-Finnish (FIN)

AF:

0.000260

AC:

AN:

19222

Middle Eastern (MID)

AF:

0.00551

AC:

AN:

544

European-Non Finnish (NFE)

AF:

0.000573

AC:

AN:

89052

Other (OTH)

AF:

0.000768

AC:

AN:

6512

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.322

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000565

AC:

AN:

141668

Hom.:

Cov.:

AF XY:

0.0000583

AC XY:

AN XY:

68588

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

38680

American (AMR)

AF:

0.00

AC:

AN:

14166

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3366

East Asian (EAS)

AF:

0.00164

AC:

AN:

4874

South Asian (SAS)

AF:

0.00

AC:

AN:

4400

European-Finnish (FIN)

AF:

0.00

AC:

AN:

8076

Middle Eastern (MID)

AF:

0.00

AC:

AN:

266

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

65012

Other (OTH)

AF:

0.00

AC:

AN:

1930

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.594

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

1017

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

0.91

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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chr6-75086648-GTATATATA-G

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over