9-98985775-G-A

Variant names:

• chr9-98985775-G-A
• NM_001855.5:c.311G>A

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP3

The NM_001855.5(COL15A1):​c.311G>A​(p.Gly104Asp) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: COL15A1 NM_001855.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.60
• Publications: 0 publications found

Genes affected

COL15A1 (HGNC:2192): (collagen type XV alpha 1 chain) This gene encodes the alpha chain of type XV collagen, a member of the FACIT collagen family (fibril-associated collagens with interrupted helices). Type XV collagen has a wide tissue distribution but the strongest expression is localized to basement membrane zones so it may function to adhere basement membranes to underlying connective tissue stroma. The proteolytically produced C-terminal fragment of type XV collagen is restin, a potentially antiangiogenic protein that is closely related to endostatin. Mouse studies have shown that collagen XV deficiency is associated with muscle and microvessel deterioration. [provided by RefSeq, May 2013]

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.828

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL15A1	NM_001855.5	c.311G>A	p.Gly104Asp	missense_variant	Exon 3 of 42	ENST00000375001.8	NP_001846.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL15A1	ENST00000375001.8	c.311G>A	p.Gly104Asp	missense_variant	Exon 3 of 42	1	NM_001855.5	ENSP00000364140.3
COL15A1	ENST00000471477.1	n.734G>A		non_coding_transcript_exon_variant	Exon 3 of 3	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Mar 24, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.311G>A (p.G104D) alteration is located in exon 3 (coding exon 3) of the COL15A1 gene. This alteration results from a G to A substitution at nucleotide position 311, causing the glycine (G) at amino acid position 104 to be replaced by an aspartic acid (D). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.68
BayesDel_addAF	Benign	-0.097	T
BayesDel_noAF	Benign	-0.38
CADD	Uncertain	24
DANN	Uncertain	0.98
DEOGEN2	Uncertain	0.43	T;T
Eigen	Uncertain	0.53
Eigen_PC	Uncertain	0.39
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.91	D;D
M_CAP	Benign	0.027	D
MetaRNN	Pathogenic	0.83	D;D
MetaSVM	Benign	-1.2	T
MutationAssessor	Pathogenic	3.0	M;.
PhyloP100		5.6
PrimateAI	Uncertain	0.54	T
PROVEAN	Pathogenic	-5.2	D;.
REVEL	Benign	0.27
Sift	Benign	0.081	T;.
Sift4G	Uncertain	0.010	D;D
Polyphen		1.0	D;.
Vest4		0.80
MutPred		0.54		Loss of methylation at R103 (P = 0.0424);.;
MVP		0.64
MPC		0.47
ClinPred		0.98	D
GERP RS		5.3
Varity_R		0.37
gMVP		0.49
Mutation Taster		=90/10	polymorphism

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

Other links and lift over

hg19: chr9-101748057;