6-75133411-G-C

Variant names:

• chr6-75133411-G-C
• NM_004370.6:c.5676C>G
• COL12A1 p.Pro1892Pro

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The NM_004370.6(COL12A1):​c.5676C>G​(p.Pro1892Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. P1892P) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: COL12A1 NM_004370.6 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.121
• 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: Genomics England PanelApp, Ambry Genetics, Illumina
• 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 -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (REVEL=0.035).
• BP7: Synonymous conserved (PhyloP=0.121 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.5676C>G	p.Pro1892Pro	synonymous	Exon 34 of 66	NP_004361.3
	COL12A1	NM_001424113.1		c.5676C>G	p.Pro1892Pro	synonymous	Exon 34 of 66	NP_001411042.1
	COL12A1	NM_001424114.1		c.5655C>G	p.Pro1885Pro	synonymous	Exon 33 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.5676C>G	p.Pro1892Pro	synonymous	Exon 34 of 66	ENSP00000325146.8	Q99715-1
	COL12A1	ENST00000345356.10	TSL:1	c.2184C>G	p.Pro728Pro	synonymous	Exon 19 of 51	ENSP00000305147.9	Q99715-2
	COL12A1	ENST00000483888.6	TSL:5	c.5676C>G	p.Pro1892Pro	synonymous	Exon 34 of 65	ENSP00000421216.1	D6RGG3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1455316 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 723542

African (AFR) AF: 0.00 AC: 0 AN: 33140

American (AMR) AF: 0.00 AC: 0 AN: 43366

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25836

East Asian (EAS) AF: 0.00 AC: 0 AN: 39594

South Asian (SAS) AF: 0.00 AC: 0 AN: 84218

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53334

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5742

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1109924

Other (OTH) AF: 0.00 AC: 0 AN: 60162

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.42
CADD	Benign	6.4
DANN	Benign	0.56
PhyloP100		0.12

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr6-75843127;