rs1466525448

Variant names:

• chr12-109573365-C-A
• rs1466525448
• NM_052845.4:c.116G>T

Your query was ambiguous. Multiple possible variants found:

• chr12-109573365-C-A
• chr12-109573365-C-T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_052845.4(MMAB):​c.116G>T​(p.Gly39Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G39D) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MMAB NM_052845.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.427
• Publications: 0 publications found

Genes affected

MMAB (HGNC:19331): (metabolism of cobalamin associated B) This gene encodes a protein that catalyzes the final step in the conversion of vitamin B(12) into adenosylcobalamin (AdoCbl), a vitamin B12-containing coenzyme for methylmalonyl-CoA mutase. Mutations in the gene are the cause of vitamin B12-dependent methylmalonic aciduria linked to the cblB complementation group. Alternatively spliced transcript variants have been found. [provided by RefSeq, Apr 2011]

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 Gene-Disease associations (from GenCC):

• porokeratosis 3, disseminated superficial actinic type

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• hyperimmunoglobulinemia D with periodic fever

  Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, G2P
• mevalonic aciduria

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Orphanet
• disseminated superficial actinic porokeratosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• porokeratosis of Mibelli

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM1: In a chain Corrinoid adenosyltransferase MMAB (size 217) in uniprot entity MMAB_HUMAN there are 24 pathogenic changes around while only 8 benign (75%) in NM_052845.4
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.108353734).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MMAB	NM_052845.4	c.116G>T	p.Gly39Val	missense_variant	Exon 1 of 9	ENST00000545712.7	NP_443077.1
MVK	XM_047428873.1	c.80C>A	p.Ala27Asp	missense_variant	Exon 1 of 11		XP_047284829.1
MMAB	NR_038118.2	n.140G>T		non_coding_transcript_exon_variant	Exon 1 of 10
MVK	XM_017019313.3	c.-221C>A		5_prime_UTR_variant	Exon 1 of 10		XP_016874802.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MMAB	ENST00000545712.7	c.116G>T	p.Gly39Val	missense_variant	Exon 1 of 9	1	NM_052845.4	ENSP00000445920.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.088
BayesDel_addAF	Uncertain	0.022	T
BayesDel_noAF	Benign	-0.21
CADD	Benign	20
DANN	Uncertain	0.98
DEOGEN2	Benign	0.24	T;.;T
Eigen	Benign	-0.67
Eigen_PC	Benign	-0.66
FATHMM_MKL	Benign	0.68	D
LIST_S2	Benign	0.82	T;T;T
M_CAP	Benign	0.062	D
MetaRNN	Benign	0.11	T;T;T
MetaSVM	Benign	-0.83	T
MutationAssessor	Benign	1.5	L;.;.
PhyloP100		0.43
PrimateAI	Benign	0.31	T
PROVEAN	Benign	-0.70	N;.;.
REVEL	Benign	0.19
Sift	Uncertain	0.013	D;.;.
Sift4G	Uncertain	0.019	D;D;D
Polyphen		0.39	B;.;.
Vest4		0.31
MutPred		0.21		Gain of sheet (P = 0.0266);Gain of sheet (P = 0.0266);Gain of sheet (P = 0.0266);
MVP		0.76
MPC		0.49
ClinPred		0.68	D
GERP RS		0.79
PromoterAI		0.0088	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.074
gMVP		0.38
Mutation Taster		=95/5	polymorphism

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: rs1466525448; hg19: chr12-110011170;