12-109591303-C-T

Position:

• chr12-109591303-C-T

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BS1 BS2

The NM_000431.4(MVK):​c.831C>T​(p.Arg277Arg) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00298 in 1,614,206 control chromosomes in the GnomAD database, including 63 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.010 (20 hom., cov: 33)
  • Exomes 𝑓: 0.0022 (43 hom.)
• Consequence: MVK NM_000431.4 synonymous
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:9 O:1
• Conservation: PhyloP100: -1.66

Genes affected

MVK (HGNC:7530): (mevalonate kinase) This gene encodes the peroxisomal enzyme mevalonate kinase. Mevalonate is a key intermediate, and mevalonate kinase a key early enzyme, in isoprenoid and sterol synthesis. Mevalonate kinase deficiency caused by mutation of this gene results in mevalonic aciduria, a disease characterized psychomotor retardation, failure to thrive, hepatosplenomegaly, anemia and recurrent febrile crises. Defects in this gene also cause hyperimmunoglobulinaemia D and periodic fever syndrome, a disorder characterized by recurrent episodes of fever associated with lymphadenopathy, arthralgia, gastrointestinal dismay and skin rash. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2014]

MVK (HGNC:):

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.47).
• BP6: Variant 12-109591303-C-T is Benign according to our data. Variant chr12-109591303-C-T is described in ClinVar as [Benign]. Clinvar id is 97632.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr12-109591303-C-T is described in Lovd as [Benign].
• BP7: Synonymous conserved (PhyloP=-1.66 with no splicing effect.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0104 (1577/152324) while in subpopulation AFR AF= 0.0309 (1285/41576). AF 95% confidence interval is 0.0295. There are 20 homozygotes in gnomad4. There are 756 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 20 Mitochondrial gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MVK	NM_000431.4	c.831C>T	p.Arg277Arg	synonymous_variant	9/11	ENST00000228510.8	NP_000422.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MVK	ENST00000228510.8	c.831C>T	p.Arg277Arg	synonymous_variant	9/11	1	NM_000431.4	ENSP00000228510.3

Frequencies

GnomAD3 genomes AF: 0.0104 AC: 1576 AN: 152206 Hom.: 20 Cov.: 33

Gnomad AFR AF: 0.0310

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00576

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.0243

Gnomad SAS AF: 0.00952

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000118

Gnomad OTH AF: 0.0105

GnomAD3 exomes AF: 0.00538 AC: 1352 AN: 251462 Hom.: 13 AF XY: 0.00447 AC XY: 608 AN XY: 135906

Gnomad AFR exome AF: 0.0297

Gnomad AMR exome AF: 0.00552

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0222

Gnomad SAS exome AF: 0.00781

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000114

Gnomad OTH exome AF: 0.00277

GnomAD4 exome AF: 0.00221 AC: 3234 AN: 1461882 Hom.: 43 Cov.: 33 AF XY: 0.00213 AC XY: 1550 AN XY: 727242

Gnomad4 AFR exome AF: 0.0314

Gnomad4 AMR exome AF: 0.00543

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0229

Gnomad4 SAS exome AF: 0.00685

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000971

Gnomad4 OTH exome AF: 0.00540

GnomAD4 genome AF: 0.0104 AC: 1577 AN: 152324 Hom.: 20 Cov.: 33 AF XY: 0.0101 AC XY: 756 AN XY: 74486

Gnomad4 AFR AF: 0.0309

Gnomad4 AMR AF: 0.00575

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.0244

Gnomad4 SAS AF: 0.00953

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000118

Gnomad4 OTH AF: 0.0114

Alfa AF: 0.00486 Hom.: 5

Bravo AF: 0.0119

Asia WGS AF: 0.0300 AC: 105 AN: 3478

EpiCase AF: 0.000273

EpiControl AF: 0.0000593

ClinVar

Significance: Benign

Submissions summary: Benign:9 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:3

Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Nov 16, 2023	- -
Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 03, 2015	- -

Hyperimmunoglobulin D with periodic fever Benign:1 Other:1

not provided, no classification provided	literature only	Unité médicale des maladies autoinflammatoires, CHRU Montpellier	-	- -
Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

not specified Benign:1

Benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

-

- -

Mevalonic aciduria Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Hyperimmunoglobulin D with periodic fever;C1867981:Porokeratosis 3, disseminated superficial actinic type;C1959626:Mevalonic aciduria Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 01, 2024

- -

Autoinflammatory syndrome Benign:1

Benign, criteria provided, single submitter

clinical testing

Genome Diagnostics Laboratory, The Hospital for Sick Children

Feb 22, 2022

- -

Retinal dystrophy Benign:1

Benign, criteria provided, single submitter

research

Dept Of Ophthalmology, Nagoya University

Oct 01, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.47
CADD	Benign	1.8
DANN	Benign	0.69
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6

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: rs104895353; hg19: chr12-110029108;