chr16-3254293-T-C

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BP6

The NM_000243.3(MEFV):c.775A>G(p.Ile259Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000403 in 1,614,100 control chromosomes in the GnomAD database, with no homozygous occurrence. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000039 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000040 ( 0 hom. )

Consequence

MEFV
NM_000243.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:9B:3O:1

Conservation

PhyloP100: -0.202

Publications

2 publications found

Variant links:

Genes affected

MEFV (HGNC:6998): (MEFV innate immunity regulator, pyrin) This gene encodes a protein, also known as pyrin or marenostrin, that is an important modulator of innate immunity. Mutations in this gene are associated with Mediterranean fever, a hereditary periodic fever syndrome. [provided by RefSeq, Jul 2008]

MEFV Gene-Disease associations (from GenCC):

familial Mediterranean fever
Inheritance: AD, AR, SD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, Myriad Women’s Health, ClinGen
autosomal recessive familial Mediterranean fever
Inheritance: AR Classification: DEFINITIVE Submitted by: G2P
familial Mediterranean fever, autosomal dominant
Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)

MEFV links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -1 ACMG points.

BP6

Variant 16-3254293-T-C is Benign according to our data. Variant chr16-3254293-T-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 97545.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MEFV	NM_000243.3 link	c.775A>G	p.Ile259Val	missense_variant	Exon 2 of 10	ENST00000219596.6	NP_000234.1
MEFV	NM_001198536.2 link	c.277+2018A>G		intron_variant	Intron 1 of 8		NP_001185465.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MEFV	ENST00000219596.6 link	c.775A>G	p.Ile259Val	missense_variant	Exon 2 of 10	1	NM_000243.3	ENSP00000219596.1

Frequencies

GnomAD3 genomes

AF:

0.0000394

AC:

AN:

152206

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000735

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000318

AC:

AN:

251446

AF XY:

0.0000589

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000440

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000404

AC:

AN:

1461894

Hom.:

Cov.:

AF XY:

0.0000413

AC XY:

AN XY:

727248

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000927

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.000520

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000414

AC:

AN:

1112012

Other (OTH)

AF:

0.0000331

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.494

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000394

AC:

AN:

152206

Hom.:

Cov.:

AF XY:

0.0000538

AC XY:

AN XY:

74364

show subpopulations

African (AFR)

AF:

0.0000241

AC:

AN:

41454

American (AMR)

AF:

0.00

AC:

AN:

15286

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5190

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000735

AC:

AN:

68032

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.567

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000543

Hom.:

Bravo

AF:

0.0000378

ExAC

AF:

0.0000247

AC:

EpiCase

AF:

0.000218

EpiControl

AF:

0.000119

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:9Benign:3Other:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Familial Mediterranean fever

Uncertain:4Benign:1Other:1

Jan 13, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces isoleucine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 259 of the MEFV protein (p.Ile259Val). This variant is present in population databases (rs104895144, gnomAD 0.006%). This missense change has been observed in individual(s) with however, in one of these individuals, a homozygous pathogenic allele was also identified in MEFV, which suggests this c.775A>G variant was not the primary cause of disease and/or Mediterranean fever (PMID: 22614345, 24469716, 25626331, 31989427). ClinVar contains an entry for this variant (Variation ID: 97545). An algorithm developed to predict the effect of missense changes on protein structure and function outputs the following: PolyPhen-2: "Benign". The valine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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. -

Jan 20, 2020

Natera, Inc.

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Unité médicale des maladies autoinflammatoires, CHRU Montpellier

Significance:not provided

Review Status:no classification provided

Collection Method:literature only

- -

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Feb 08, 2023

Genome-Nilou Lab

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

May 28, 2019

Mendelics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Uncertain:2

Mar 22, 2016

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: The variant c.775A>G (p.Ile259Val) affects a non-conserved nucleotide and results in replacement of Valine with an Isoleucine. Both amino acids are medium size and hydrophobic and therefore this substitution likely does not change the physico-chemical property of the protein. 5/5 in silico tools predict benign outcome for this change. The variant was found in the large and broad cohorts of the NHLBI-ES and ExAC projects at an allele frequency of 0.0025% which does not exceed the maximal expected allele frequency for a disease-causing MEFV variant (2.17%). However, the possibility that this variant may still represent as a rare polymorphism cannot be ruled out. There are a few patients with symptoms of FMF reported in the literature who carried the variant; however, most of these patient reports lack detailed clinical phenotypic data. Importantly, one patient with symptoms of FMF also carried p. M694V in homozygous state, indicating this variant may not be pathogenic or it acts as modifier of the pathogenic variant p.M694V. The variant p.M694V is known to be a highly penetrant pathogenic variant. Deletion of p.M694 has been shown to be causal for dominant FMF which also highlights the importance of p.M694 residue. There are no in vivo/vitro studies to describe the functional impact of the variant till date. Infevers database lists variant in one Turkish patient with a classification of VUS (unknown consequence) and HGMD lists variant with a classification of "Disease-Mutation". In summary, collective evidence suggests that this variant is unlikely to be pathogenic and it was classified as a VUS-possibly benign until more information becomes available. -

Apr 26, 2024

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The MEFV c.775A>G; p.Ile259Val variant (rs104895144), is reported in the literature in the heterozygous state in individuals affected with familial mediterranean fever (Balta 2020, Ceylan 2012, Oztuzcu 2014, Tzifi 2014). This variant is reported in ClinVar (Variation ID: 97545), and is found in the general population with an overall allele frequency of 0.0032% (8/251,446 alleles) in the Genome Aggregation Database (v2.1.1). Computational analyses are uncertain whether this variant is neutral or deleterious (REVEL: 0.315). Due to limited information, the clinical significance of the p.Ile259Val variant is uncertain at this time. References: Balta B et al. A comprehensive molecular analysis and genotype-phenotype correlation in patients with familial mediterranean fever. Mol Biol Rep. 2020 Mar;47(3):1835-1843. PMID: 31989427. Ceylan GG et al. Frequency of alterations in the MEFV gene and clinical signs in familial Mediterranean fever in Central Anatolia, Turkey. Genet Mol Res. 2012 May 7;11(2):1185-94. PMID: 22614345. Oztuzcu S et al. Screening of common and novel familial mediterranean fever mutations in south-east part of Turkey. Mol Biol Rep. 2014;41(4):2601-7. PMID: 24469716. Tzifi F et al. Acute hepatitis in a child heterozygous for the I259V MEFV gene variant. Prague Med Rep. 2014;115(3-4):128-33. PMID: 25626331. -

Familial Mediterranean fever;C0085077:Acute febrile neutrophilic dermatosis;C1851347:Familial Mediterranean fever, autosomal dominant

Uncertain:1

Jun 12, 2024

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Autoinflammatory syndrome

Uncertain:1

Nov 30, 2021

Genome Diagnostics Laboratory, The Hospital for Sick Children

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

MEFV-related disorder

Uncertain:1

Jun 02, 2023

PreventionGenetics, part of Exact Sciences

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The MEFV c.775A>G variant is predicted to result in the amino acid substitution p.Ile259Val. This variant has been reported in five patients with familial Mediterranean fever (FMF), although segregation data was not presented in any of these cases and one patient was also homozygous for a different pathogenic variant (Ceylan et al. 2012. PubMed ID: 22614345; Oztuzcu et al. 2014. PubMed ID: 24469716; Tzifi et al. 2014. PubMed ID: 25626331; Balta et al. 2020. PubMed ID: 31989427). This variant was also reported in a patient with early coronary heart disease (Basar et al. 2014. PubMed ID: 24702757). This variant is reported in 0.0065% of alleles in individuals of South Asian descent in gnomAD (http://gnomad.broadinstitute.org/variant/16-3304293-T-C). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Acute febrile neutrophilic dermatosis

Benign:1

Feb 08, 2023

Genome-Nilou Lab

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Familial Mediterranean fever, autosomal dominant

Benign:1

Feb 08, 2023

Genome-Nilou Lab

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.081

BayesDel_addAF

Benign

-0.19

BayesDel_noAF

Benign

-0.33

CADD

Benign

1.1

(source)

DANN

Benign

0.14

DEOGEN2

Benign

0.25

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.1

FATHMM_MKL

Benign

0.016

LIST_S2

Benign

0.52

M_CAP

Benign

0.016

MetaRNN

Uncertain

0.48

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.55

PhyloP100

-0.20

PrimateAI

Benign

0.27

PROVEAN

Benign

0.40

REVEL

Uncertain

0.32

Sift

Benign

1.0

Sift4G

Benign

1.0

Polyphen

0.0010

Vest4

0.64

MutPred

0.71

Gain of helix (P = 0.005);

MVP

0.49

MPC

0.095

ClinPred

0.026

GERP RS

-2.1

Varity_R

0.022

gMVP

0.31

Mutation Taster

=97/3

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.060

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over