2-206749050-C-G

Variant summary

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

The NM_001039845.3(MDH1B):c.1186G>C(p.Glu396Gln) variant causes a missense change. The variant allele was found at a frequency of 0.00000657 in 152,170 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: 𝑓 0.0000066 (0 hom., cov: 33)
• Consequence: MDH1B NM_001039845.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.75

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 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MDH1B	NM_001039845.3	c.1186G>C	p.Glu396Gln	missense_variant	7/12	ENST00000374412.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MDH1B	ENST00000374412.8	c.1186G>C	p.Glu396Gln	missense_variant	7/12	1	NM_001039845.3	P4

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152170 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

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: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 31

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152170 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 74344

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.0000655

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000151

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

Jan 09, 2024

The c.1186G>C (p.E396Q) alteration is located in exon 7 (coding exon 7) of the MDH1B gene. This alteration results from a G to C substitution at nucleotide position 1186, causing the glutamic acid (E) at amino acid position 396 to be replaced by a glutamine (Q). 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	Benign	0.33
BayesDel_addAF	Benign	0.0021	T
BayesDel_noAF	Benign	-0.23
Cadd	Uncertain	25
Dann	Uncertain	0.98
DEOGEN2	Benign	0.044	T;.;.
Eigen	Benign	0.18
Eigen_PC	Benign	0.16
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.93	D;D;D
M_CAP	Benign	0.038	D
MetaRNN	Uncertain	0.62	D;D;D
MetaSVM	Benign	-0.48	T
MutationAssessor	Uncertain	2.5	M;.;M
MutationTaster	Benign	0.98	D;D;D;N
PrimateAI	Uncertain	0.56	T
PROVEAN	Benign	-1.3	N;N;N
REVEL	Benign	0.17
Sift	Benign	0.14	T;T;T
Sift4G	Benign	0.11	T;D;T
Polyphen		0.64	P;.;P
Vest4		0.77
MutPred		0.28		Gain of sheet (P = 0.1208);.;Gain of sheet (P = 0.1208);
MVP		0.50
MPC		0.28
ClinPred		0.91	D
GERP RS		4.9
Varity_R		0.13
gMVP		0.74

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs1688284228; hg19: chr2-207613774; COSMIC: COSV65589857;