chr6-75194844-C-T

Variant names:

• chr6-75194844-C-T
• rs772158281
• NM_004370.6:c.177G>A

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4_Moderate BP6_Moderate BP7

The NM_004370.6(COL12A1):​c.177G>A​(p.Val59Val) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000481 in 1,456,324 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: COL12A1 NM_004370.6 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.452
• Publications: 0 publications found

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: Orphanet, Labcorp Genetics (formerly Invitae)
• 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

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.35).
• BP6: Variant 6-75194844-C-T is Benign according to our data. Variant chr6-75194844-C-T is described in ClinVar as Likely_benign. ClinVar VariationId is 475845.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=0.452 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004370.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL12A1	NM_004370.6	MANE Select	c.177G>A	p.Val59Val	synonymous	Exon 3 of 66	NP_004361.3
	COL12A1	NM_001424113.1		c.177G>A	p.Val59Val	synonymous	Exon 3 of 66	NP_001411042.1
	COL12A1	NM_001424114.1		c.177G>A	p.Val59Val	synonymous	Exon 3 of 65	NP_001411043.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL12A1	ENST00000322507.13	TSL:1 MANE Select	c.177G>A	p.Val59Val	synonymous	Exon 3 of 66	ENSP00000325146.8	Q99715-1
	COL12A1	ENST00000345356.10	TSL:1	c.73+7876G>A		intron	N/A	ENSP00000305147.9	Q99715-2
	COL12A1	ENST00000483888.6	TSL:5	c.177G>A	p.Val59Val	synonymous	Exon 3 of 65	ENSP00000421216.1	D6RGG3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000809 AC: 2 AN: 247088 AF XY: 0.00000746

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 FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000887

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000481 AC: 7 AN: 1456324 Hom.: 0 Cov.: 29 AF XY: 0.00000414 AC XY: 3 AN XY: 724554

African (AFR) AF: 0.00 AC: 0 AN: 33276

American (AMR) AF: 0.00 AC: 0 AN: 44320

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26042

East Asian (EAS) AF: 0.00 AC: 0 AN: 39564

South Asian (SAS) AF: 0.0000235 AC: 2 AN: 85282

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53358

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5756

European-Non Finnish (NFE) AF: 0.00000451 AC: 5 AN: 1108514

Other (OTH) AF: 0.00 AC: 0 AN: 60212

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Likely benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	-	1	Bethlem myopathy 2;C4225314:Ullrich congenital muscular dystrophy 2 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.35
CADD	Benign	12
DANN	Benign	0.85
PhyloP100		0.45

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs772158281; hg19: chr6-75904560; COSMIC: COSV59409567;