rs199476190

Variant names:

• chr4-186197044-T-G
• rs199476190
• NM_207352.4:c.518T>G

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2 PP3_Strong PP5_Very_Strong

The NM_207352.4(CYP4V2):​c.518T>G​(p.Leu173Trp) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000753 in 1,461,292 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000075 (1 hom.)
• Consequence: CYP4V2 NM_207352.4 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 7.56

Genes affected

CYP4V2 (HGNC:23198): (cytochrome P450 family 4 subfamily V member 2) This gene encodes a member of the cytochrome P450 hemethiolate protein superfamily which are involved in oxidizing various substrates in the metabolic pathway. It is implicated in the metabolism of fatty acid precursors into n-3 polyunsaturated fatty acids. Mutations in this gene result in Bietti crystalline corneoretinal dystrophy. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.986
• PP5: Variant 4-186197044-T-G is Pathogenic according to our data. Variant chr4-186197044-T-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 39266.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr4-186197044-T-G is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CYP4V2	NM_207352.4	c.518T>G	p.Leu173Trp	missense_variant	Exon 4 of 11	ENST00000378802.5	NP_997235.3
CYP4V2	XM_005262935.5	c.518T>G	p.Leu173Trp	missense_variant	Exon 4 of 11		XP_005262992.1
CYP4V2	XM_047450077.1	c.122T>G	p.Leu41Trp	missense_variant	Exon 2 of 9		XP_047306033.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CYP4V2	ENST00000378802.5	c.518T>G	p.Leu173Trp	missense_variant	Exon 4 of 11	1	NM_207352.4	ENSP00000368079.4
CYP4V2	ENST00000507209.5	n.957T>G		non_coding_transcript_exon_variant	Exon 1 of 6	1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000753 AC: 11 AN: 1461292 Hom.: 1 Cov.: 32 AF XY: 0.00000963 AC XY: 7 AN XY: 726930

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000277

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

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Bietti crystalline corneoretinal dystrophy Pathogenic:2

Apr 12, 2012

GeneReviews

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: curation

- -

May 04, 2022

Mendelics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Retinal dystrophy Pathogenic:1

Oct 01, 2023

Dept Of Ophthalmology, Nagoya University

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.89
BayesDel_addAF	Pathogenic	0.41	D
BayesDel_noAF	Pathogenic	0.35
CADD	Pathogenic	27
DANN	Benign	0.96
DEOGEN2	Benign	0.37	T
Eigen	Pathogenic	0.93
Eigen_PC	Pathogenic	0.83
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.95	D
M_CAP	Pathogenic	0.42	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Uncertain	0.71	D
MutationAssessor	Pathogenic	4.4	H
PrimateAI	Uncertain	0.66	T
PROVEAN	Pathogenic	-5.3	D
REVEL	Pathogenic	0.93
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0010	D
Polyphen		1.0	D
Vest4		0.97
MutPred		0.91		Loss of stability (P = 0.0494);
MVP		0.88
MPC		0.51
ClinPred		1.0	D
GERP RS		5.4
Varity_R		0.94
gMVP		0.89

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

LitVar

Other links and lift over

dbSNP: rs199476190; hg19: chr4-187118198;