4-186194568-G-C

Variant names:

• chr4-186194568-G-C
• rs199476187
• NM_207352.4:c.283G>C

Variant summary

Our verdict is Pathogenic. The variant received 17 ACMG points: 17P and 0B. PS1_Very_Strong PM2 PP2 PP3_Strong PP5_Moderate

The NM_207352.4(CYP4V2):​c.283G>C​(p.Gly95Arg) variant causes a missense change involving the alteration of a conserved nucleotide. 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 Likely pathogenic (★). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely pathogenic in ClinVar.

• Frequency: Genomes: not found (cov: 33)
• Consequence: CYP4V2 NM_207352.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 8.44
• Publications: 0 publications found

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]

CYP4V2 Gene-Disease associations (from GenCC):

• Bietti crystalline corneoretinal dystrophy

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Illumina, G2P, ClinGen, Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae), Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 17 ACMG points.

• PS1: Transcript NM_207352.4 (CYP4V2) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in ClinVar.
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 24 curated pathogenic missense variants (we use a threshold of 10). The gene has 7 curated benign missense variants. Gene score misZ: -0.12103 (below the threshold of 3.09). Trascript score misZ: -0.14191 (below the threshold of 3.09). GenCC associations: The gene is linked to Bietti crystalline corneoretinal dystrophy.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.994
• PP5: Variant 4-186194568-G-C is Pathogenic according to our data. Variant chr4-186194568-G-C is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 3239433.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_207352.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CYP4V2	NM_207352.4	MANE Select	c.283G>C	p.Gly95Arg	missense	Exon 2 of 11	NP_997235.3	Q6ZWL3-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CYP4V2	ENST00000378802.5	TSL:1 MANE Select	c.283G>C	p.Gly95Arg	missense	Exon 2 of 11	ENSP00000368079.4	Q6ZWL3-1
	CYP4V2	ENST00000905173.1		c.283G>C	p.Gly95Arg	missense	Exon 2 of 12	ENSP00000575232.1
	CYP4V2	ENST00000905174.1		c.283G>C	p.Gly95Arg	missense	Exon 2 of 11	ENSP00000575233.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Likely pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.52	D
BayesDel_noAF	Pathogenic	0.51
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.43	T
Eigen	Uncertain	0.66
Eigen_PC	Uncertain	0.52
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.95	D
M_CAP	Pathogenic	0.48	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.9	H
PhyloP100		8.4
PrimateAI	Uncertain	0.61	T
PROVEAN	Pathogenic	-7.4	D
REVEL	Pathogenic	0.92
Sift	Uncertain	0.0020	D
Sift4G	Uncertain	0.0030	D
Polyphen		1.0	D
Vest4		0.99
MutPred		0.93		Gain of methylation at G95 (P = 0.0487)
MVP		0.97
MPC		0.44
ClinPred		1.0	D
GERP RS		5.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.89
gMVP		0.96
Mutation Taster		=31/69	disease causing

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: rs199476187; hg19: chr4-187115722;