NM_018192.4:c.556C>T

Variant names:

• chr3-189995367-G-A
• rs724160006
• NM_018192.4:c.556C>T

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_018192.4(P3H2):​c.556C>T​(p.Gln186*) variant causes a stop gained change. The variant allele was found at a frequency of 0.000000684 in 1,461,814 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 Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: P3H2 NM_018192.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 3.73
• Publications: 3 publications found

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]

P3H2 Gene-Disease associations (from GenCC):

• myopia, high, with cataract and vitreoretinal degeneration

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: G2P, Ambry Genetics

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 3-189995367-G-A is Pathogenic according to our data. Variant chr3-189995367-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 162462.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_018192.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	P3H2	NM_018192.4	MANE Select	c.556C>T	p.Gln186*	stop_gained	Exon 2 of 15	NP_060662.2
	P3H2	NM_001134418.2		c.13C>T	p.Gln5*	stop_gained	Exon 2 of 15	NP_001127890.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	P3H2	ENST00000319332.10	TSL:1 MANE Select	c.556C>T	p.Gln186*	stop_gained	Exon 2 of 15	ENSP00000316881.5
	P3H2	ENST00000427335.6	TSL:1	c.13C>T	p.Gln5*	stop_gained	Exon 2 of 15	ENSP00000408947.2
	P3H2	ENST00000444866.5	TSL:4	c.13C>T	p.Gln5*	stop_gained	Exon 2 of 4	ENSP00000391374.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461814 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727210

African (AFR) AF: 0.00 AC: 0 AN: 33476

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.00 AC: 0 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53404

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111962

Other (OTH) AF: 0.00 AC: 0 AN: 60392

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Myopia, high, with cataract and vitreoretinal degeneration Pathogenic:1

Dec 01, 2014

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

not provided Pathogenic:1

Sep 23, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ClinVar contains an entry for this variant (Variation ID: 162462). For these reasons, this variant has been classified as Pathogenic. This variant is also known as LEPREL1 c.13C>T (p.Q5X). This premature translational stop signal has been observed in individual(s) with high myopia with early-onset cataract (PMID: 24172257). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Gln186*) in the P3H2 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in P3H2 are known to be pathogenic (PMID: 24172257, 25469533).

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.48
CADD	Pathogenic	46
DANN	Uncertain	1.0
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.90
FATHMM_MKL	Uncertain	0.86	D
PhyloP100		3.7
Vest4		0.33
GERP RS		4.5
Mutation Taster		=6/194	disease causing (ClinVar)

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

dbSNP: rs724160006; hg19: chr3-189713156;