3-189957995-G-A

Position:

• chr3-189957995-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PVS1_Moderate PM2

The NM_018192.4(P3H2):​c.2044C>T​(p.Gln682Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000103 in 1,460,424 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.000010 (0 hom.)
• Consequence: P3H2 NM_018192.4 stop_gained
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.04

Genes affected

P3H2 (HGNC:19317): (prolyl 3-hydroxylase 2) This gene encodes a member of the prolyl 3-hydroxylase subfamily of 2-oxo-glutarate-dependent dioxygenases. These enzymes play a critical role in collagen chain assembly, stability and cross-linking by catalyzing post-translational 3-hydroxylation of proline residues. Mutations in this gene are associated with nonsyndromic severe myopia with cataract and vitreoretinal degeneration, and downregulation of this gene may play a role in breast cancer. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Dec 2011]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.039 CDS is truncated, and there are 0 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
P3H2	NM_018192.4	c.2044C>T	p.Gln682Ter	stop_gained	15/15	ENST00000319332.10	NP_060662.2
P3H2	NM_001134418.2	c.1501C>T	p.Gln501Ter	stop_gained	15/15		NP_001127890.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
P3H2	ENST00000319332.10	c.2044C>T	p.Gln682Ter	stop_gained	15/15	1	NM_018192.4	ENSP00000316881	P1
P3H2	ENST00000427335.6	c.1501C>T	p.Gln501Ter	stop_gained	15/15	1		ENSP00000408947
P3H2	ENST00000490940.1	n.174C>T		non_coding_transcript_exon_variant	2/2	2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.0000103 AC: 15 AN: 1460424 Hom.: 0 Cov.: 29 AF XY: 0.00000550 AC XY: 4 AN XY: 726644

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: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000126

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 28, 2019

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. This variant has not been reported in the literature in individuals with P3H2-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change results in a premature translational stop signal in the P3H2 gene (p.Gln682*). While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 27 amino acids of the P3H2 protein. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.53	D
BayesDel_noAF	Pathogenic	0.53
CADD	Pathogenic	36
DANN	Uncertain	0.99
Eigen	Pathogenic	0.82
Eigen_PC	Uncertain	0.63
FATHMM_MKL	Uncertain	0.91	D
MutationTaster	Benign	1.0	D;D
Vest4		0.23
GERP RS		2.8

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

Publications

LitVar

Other links and lift over

dbSNP: rs1722692833; hg19: chr3-189675784;