16-3249468-C-G

Variant names:

• chr16-3249468-C-G
• rs11466024
• NM_000243.3:c.1223G>C
• MEFV p.Arg408Pro

GermlineCancer (beta)

Variant summary

Our verdict is Uncertain significance.

+1 Uncertain · Cold

-7

-6

-1

0

+5

+6

+9

+10

BenignB

Likely BenignLB

UncertainVUS

Likely PathogenicLP

PathogenicP

The variant received 1 classification points (ACGS-UK Somatic Oncogenicity v2025). O3_ModerateB3_Supporting

The NM_000243.3(MEFV):c.1223G>C (p.Arg408Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant has a gnomAD grpmax filtering allele frequency (95% CI) of 0.000000899, indicating it is observed in the general population. Note: a gnomAD entry for this variant shows a statistical allele-bias signature, consistent with mosaic/somatic contamination (e.g. age-related clonal hematopoiesis) rather than true inherited population frequency — this frequency should not be read as evidence of a common, benign germline variant. In-silico predictor (REVEL) classifies this variant as likely benign. Splicing prediction tools (SpliceAI) predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Other variants at the same amino acid position have been reported in ClinVar (not pathogenic): p.R408L: Conflicting_classifications_of_pathogenicity (ClinVar VariationId 457995); p.R408Q: Conflicting_classifications_of_pathogenicity (ClinVar VariationId 2552); p.R408W: Conflicting_classifications_of_pathogenicity (ClinVar VariationId 457994)

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: MEFV NM_000243.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.571
• Publications: 152 publications found

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):

• autosomal recessive familial Mediterranean fever

  Inheritance: AR Classification: DEFINITIVE Submitted by: G2P
• familial Mediterranean fever

  Inheritance: AR, SD, AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Myriad Women's Health, Natera, ClinGen, Orphanet, PanelApp Australia
• familial Mediterranean fever, autosomal dominant

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)

Classification according to ACGS-UK Somatic Oncogenicity v2025

Classification was made for transcript:

Our verdict: Uncertain_significance. The variant received 1 points.

Apply	Criterion Code & Title / Strength	Strength	Rationale / Clinical Context
	O3Absent or very rare in population		Absent or extremely rare in gnomAD (AC ≤ 2) — O3 moderate; GnomAD: AF = 0.000001, AC = 0 — absent/extremely rare (O3 moderate [+2])
	B3Computational evidence does not support deleterious effect		Computational evidence does not support a deleterious effect; Missense variant — primary computational scorer does not support an oncogenic/deleterious effect; supports B3

Variant Effect in Transcripts

Automated classification analysis was done for transcript: NM_000243.3. You can select a different transcript below to see updated classification assignments.

RefSeq Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	MEFV NM_000243.3	MANE Select	c.1223G>C p.Arg408Pro	missense	Exon 3 of 10	Prot: NP_000234.1 UniProt:
	MEFV NM_001198536.2		c.590G>C p.Arg197Pro	missense	Exon 2 of 9	Prot: NP_001185465.2 UniProt:

MEFV NM_000243.3

MANE Select

HGVSc / HGVSpc.1223G>Cp.Arg408Pro

Exon rankExon 3 of 10

missense

Prot: NP_000234.1UniProt: O15553-2

MEFV NM_001198536.2

HGVSc / HGVSpc.590G>Cp.Arg197Pro

Exon rankExon 2 of 9

missense

Prot: NP_001185465.2UniProt: D2DTW2O15553-3

Ensembl Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	MEFV ENST00000219596.6	TSL:1MANE Select	c.1223G>C p.Arg408Pro	missense	Exon 3 of 10	Prot: ENSP00000219596.1 UniProt:
	MEFV ENST00000541159.5	TSL:1	c.590G>C p.Arg197Pro	missense	Exon 2 of 9	Prot: ENSP00000438711.1 UniProt:
	MEFV ENST00000539145.5	TSL:1	n.278-2222G>C	intron	Intron 1 of 6	Prot: ENSP00000444471.1 UniProt:

MEFV ENST00000219596.6

TSL:1MANE Select

HGVSc / HGVSpc.1223G>Cp.Arg408Pro

Exon rankExon 3 of 10

missense

Prot: ENSP00000219596.1UniProt: O15553-2

MEFV ENST00000541159.5

TSL:1

HGVSc / HGVSpc.590G>Cp.Arg197Pro

Exon rankExon 2 of 9

missense

Prot: ENSP00000438711.1UniProt: O15553-3

MEFV ENST00000539145.5

TSL:1

HGVSc / HGVSpn.278-2222G>C

Exon rankIntron 1 of 6

intron

Prot: ENSP00000444471.1UniProt: F6TF35

Frequencies

Allele frequencies (AF), counts (AC/AN), homozygotes and coverage

Common (AF > 0.05 / Hom > 5)

Rare (AF ≤ 0.0001 / Hom ≤ 1)

Source / population	AF	AC	Hom	AN	Coverage
Global population databases 3 sources Large-scale international reference populations
GnomAD3 genomes	AF:	AC:	Hom:	AN:	Cov:33
GnomAD4 exome Warning	AF: 6.84e-7	AC:1	Hom:0	AN:1461730	Cov:32
GnomAD4 genome	AF:	AC:	Hom:	AN:	Cov:33

Showing 3 sources

ClinVar

Not reported in ClinVar

Computational Scores

Algorithm	Calibrated pred.	Score	Prediction
AlphaGenome AVI	Uncertain	15
AlphaMissense	Uncertain	0.48
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.45
CADD	Benign	15
DANN	Benign	0.93
DEOGEN2	Benign	0.35	T
Eigen	Benign	-0.70
Eigen_PC	Benign	-0.93
FATHMM_MKL	Benign	0.058	N
FuncVEP CTI	Pathogenic	0.98
GPN-Star LLR	N/A	-5.7
GPN-Star score	N/A	5.7
LIST_S2	Benign	0.41	T
M_CAP	Benign	0.034	D
MetaRNN	Benign	0.40	T
MetaSVM	Benign	-0.84	T
Mutation Taster	N/A	97/3	polymorphism
MutationAssessor	Uncertain	2.1	M
PhyloP100	Benign	-0.57
popEVE	Benign	-3.2
PrimateAI	Benign	0.19	T
PROVEAN	Uncertain	-3.2	D
REVEL	Benign	0.15
Sift	Benign	0.065	T
Sift4G	Uncertain	0.043	D
Varity_R	N/A	0.27
VESM-3B	Benign	-8.2

Showing 28 of 28 scores

Splicing Scores

Algorithm	Calibrated pred.	Score	Prediction
Pangolin (max)	Benign	0.0
SpliceAI score (max)	Benign	0.0	Details are displayed if max score is > 0.2

Showing 2 of 2 scores

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

MaveDB functional evidence

MaveDB is a public repository of laboratory assays that test the effect of thousands of variants at once — treat this as supporting research data and interpret it with great caution; it is not a clinical classification.

No MaveDB functional evidence found for this variant.

Other links and lift over

dbSNP: rs11466024;

hg19: chr16-3299468;

ACMG debug oncogenicity

ACGS debug oncogenicity

ACMG debug germline

Submit to ClinVar