19-9960840-G-C

Variant names:

• chr19-9960840-G-C
• NM_015719.4:c.4902C>G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_015719.4(COL5A3):​c.4902C>G​(p.Asn1634Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,459,904 control chromosomes in the GnomAD database, with no homozygous occurrence. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: COL5A3 NM_015719.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.679

Genes affected

COL5A3 (HGNC:14864): (collagen type V alpha 3 chain) This gene encodes an alpha chain for one of the low abundance fibrillar collagens. Fibrillar collagen molecules are trimers that can be composed of one or more types of alpha chains. Type V collagen is found in tissues containing type I collagen and appears to regulate the assembly of heterotypic fibers composed of both type I and type V collagen. This gene product is closely related to type XI collagen and it is possible that the collagen chains of types V and XI constitute a single collagen type with tissue-specific chain combinations. Mutations in this gene are thought to be responsible for the symptoms of a subset of patients with Ehlers-Danlos syndrome type III. Messages of several sizes can be detected in northern blots but sequence information cannot confirm the identity of the shorter messages. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL5A3	NM_015719.4	c.4902C>G	p.Asn1634Lys	missense_variant	Exon 66 of 67	ENST00000264828.4	NP_056534.2
COL5A3	XM_011528042.3	c.4899C>G	p.Asn1633Lys	missense_variant	Exon 66 of 67		XP_011526344.1
COL5A3	XM_017026849.2	c.2565C>G	p.Asn855Lys	missense_variant	Exon 39 of 40		XP_016882338.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL5A3	ENST00000264828.4	c.4902C>G	p.Asn1634Lys	missense_variant	Exon 66 of 67	1	NM_015719.4	ENSP00000264828.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1459904 Hom.: 0 Cov.: 37 AF XY: 0.00000138 AC XY: 1 AN XY: 726356

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Apr 13, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.4902C>G (p.N1634K) alteration is located in exon 66 (coding exon 66) of the COL5A3 gene. This alteration results from a C to G substitution at nucleotide position 4902, causing the asparagine (N) at amino acid position 1634 to be replaced by a lysine (K). 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	Benign	0.33
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.42
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Benign	0.14	T
Eigen	Benign	-0.53
Eigen_PC	Benign	-0.44
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.96	D
M_CAP	Benign	0.071	D
MetaRNN	Uncertain	0.47	T
MetaSVM	Benign	-0.89	T
MutationAssessor	Benign	0.95	L
PrimateAI	Benign	0.42	T
PROVEAN	Benign	-1.9	N
REVEL	Benign	0.11
Sift	Uncertain	0.0050	D
Sift4G	Uncertain	0.035	D
Polyphen		0.033	B
Vest4		0.21
MutPred		0.75		Gain of ubiquitination at N1634 (P = 0.0408);
MVP		0.71
MPC		0.40
ClinPred		0.65	D
GERP RS		3.0
Varity_R		0.25
gMVP		0.63

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: chr19-10071516;