2-206746330-A-C

Position:

• chr2-206746330-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001039845.3(MDH1B):​c.1313T>G​(p.Ile438Arg) 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. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MDH1B NM_001039845.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.23

Genes affected

MDH1B (HGNC:17836): (malate dehydrogenase 1B) Predicted to enable L-malate dehydrogenase activity. Predicted to be involved in NADH metabolic process; dicarboxylic acid metabolic process; and tricarboxylic acid cycle. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.25668693).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MDH1B	NM_001039845.3	c.1313T>G	p.Ile438Arg	missense_variant	8/12	ENST00000374412.8	NP_001034934.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MDH1B	ENST00000374412.8	c.1313T>G	p.Ile438Arg	missense_variant	8/12	1	NM_001039845.3	ENSP00000363533	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 14, 2023

The c.1313T>G (p.I438R) alteration is located in exon 8 (coding exon 8) of the MDH1B gene. This alteration results from a T to G substitution at nucleotide position 1313, causing the isoleucine (I) at amino acid position 438 to be replaced by an arginine (R). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.36
BayesDel_addAF	Benign	-0.16	T
BayesDel_noAF	Benign	-0.46
CADD	Benign	19
DANN	Benign	0.95
DEOGEN2	Benign	0.040	T;.;.
Eigen	Benign	-0.44
Eigen_PC	Benign	-0.39
FATHMM_MKL	Benign	0.36	N
LIST_S2	Benign	0.76	T;T;T
M_CAP	Benign	0.0081	T
MetaRNN	Benign	0.26	T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.4	M;.;M
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Benign	0.46	T
PROVEAN	Benign	-1.9	N;N;N
REVEL	Benign	0.13
Sift	Benign	0.18	T;T;T
Sift4G	Benign	0.50	T;T;T
Polyphen		0.14	B;.;B
Vest4		0.50
MutPred		0.53		Gain of disorder (P = 0.0089);.;Gain of disorder (P = 0.0089);
MVP		0.42
MPC		0.30
ClinPred		0.31	T
GERP RS		5.6
Varity_R		0.13
gMVP		0.53

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-207611054;