NM_001845.6:c.1807C>G

Variant names:

• chr13-110186475-G-C
• NM_001845.6:c.1807C>G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_001845.6(COL4A1):​c.1807C>G​(p.Pro603Ala) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,522 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: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: COL4A1 NM_001845.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.93

Genes affected

COL4A1 (HGNC:2202): (collagen type IV alpha 1 chain) This gene encodes a type IV collagen alpha protein. Type IV collagen proteins are integral components of basement membranes. This gene shares a bidirectional promoter with a paralogous gene on the opposite strand. The protein consists of an amino-terminal 7S domain, a triple-helix forming collagenous domain, and a carboxy-terminal non-collagenous domain. It functions as part of a heterotrimer and interacts with other extracellular matrix components such as perlecans, proteoglycans, and laminins. In addition, proteolytic cleavage of the non-collagenous carboxy-terminal domain results in a biologically active fragment known as arresten, which has anti-angiogenic and tumor suppressor properties. Mutations in this gene cause porencephaly, cerebrovascular disease, and renal and muscular defects. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2014]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the COL4A1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 194 curated pathogenic missense variants (we use a threshold of 10). The gene has 77 curated benign missense variants. Gene score misZ: 3.0194 (below the threshold of 3.09). Trascript score misZ: 4.972 (above the threshold of 3.09). GenCC associations: The gene is linked to brain small vessel disease 1 with or without ocular anomalies, pontine autosomal dominant microangiopathy with leukoencephalopathy, muscular dystrophy-dystroglycanopathy, type A, microangiopathy and leukoencephalopathy, pontine, autosomal dominant, familial porencephaly, autosomal dominant familial hematuria-retinal arteriolar tortuosity-contractures syndrome, retinal arterial tortuosity.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL4A1	NM_001845.6	c.1807C>G	p.Pro603Ala	missense_variant	Exon 26 of 52	ENST00000375820.10	NP_001836.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL4A1	ENST00000375820.10	c.1807C>G	p.Pro603Ala	missense_variant	Exon 26 of 52	1	NM_001845.6	ENSP00000364979.4
COL4A1	ENST00000649738.1	n.1937C>G		non_coding_transcript_exon_variant	Exon 26 of 31

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461522 Hom.: 0 Cov.: 33 AF XY: 0.00000138 AC XY: 1 AN XY: 727076

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.054
BayesDel_addAF	Pathogenic	0.20	D
BayesDel_noAF	Uncertain	0.060
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.84	D
Eigen	Uncertain	0.49
Eigen_PC	Uncertain	0.50
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.68	T
M_CAP	Uncertain	0.21	D
MetaRNN	Uncertain	0.70	D
MetaSVM	Pathogenic	0.88	D
MutationAssessor	Uncertain	2.3	M
PrimateAI	Uncertain	0.54	T
PROVEAN	Pathogenic	-4.7	D
REVEL	Pathogenic	0.65
Sift	Uncertain	0.010	D
Sift4G	Benign	0.29	T
Polyphen		0.86	P
Vest4		0.51
MutPred		0.42		Gain of catalytic residue at Y608 (P = 0);
MVP		0.82
MPC		1.2
ClinPred		0.98	D
GERP RS		4.1
Varity_R		0.20
gMVP		0.34

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr13-110838822;