rs11125979

Positions:

• chr2-63597172-T-G

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_005917.4(MDH1):​c.200-227T>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.244 in 570,194 control chromosomes in the GnomAD database, including 18,014 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.27 (6258 hom., cov: 32)
  • Exomes 𝑓: 0.24 (11756 hom.)
• Consequence: MDH1 NM_005917.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.267

Genes affected

MDH1 (HGNC:6970): (malate dehydrogenase 1) This gene encodes an enzyme that catalyzes the NAD/NADH-dependent, reversible oxidation of malate to oxaloacetate in many metabolic pathways, including the citric acid cycle. Two main isozymes are known to exist in eukaryotic cells: one is found in the mitochondrial matrix and the other in the cytoplasm. This gene encodes the cytosolic isozyme, which plays a key role in the malate-aspartate shuttle that allows malate to pass through the mitochondrial membrane to be transformed into oxaloacetate for further cellular processes. Alternatively spliced transcript variants have been found for this gene. A recent study showed that a C-terminally extended isoform is produced by use of an alternative in-frame translation termination codon via a stop codon readthrough mechanism, and that this isoform is localized in the peroxisomes. Pseudogenes have been identified on chromosomes X and 6. [provided by RefSeq, Feb 2016]

MDH1 (HGNC:):

WDPCP (HGNC:28027): (WD repeat containing planar cell polarity effector) This gene encodes a cytoplasmic WD40 repeat protein. A similar gene in frogs encodes a planar cell polarity protein that plays a critical role in collective cell movement and ciliogenesis by mediating septin localization. Mutations in this gene are associated with Bardet-Biedl syndrome 15 and may also play a role in Meckel-Gruber syndrome. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jun 2014]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.87).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.691 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MDH1	NM_005917.4	c.200-227T>G		intron_variant		ENST00000233114.13	NP_005908.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MDH1	ENST00000233114.13	c.200-227T>G		intron_variant		1	NM_005917.4	ENSP00000233114.8

Frequencies

GnomAD3 genomes AF: 0.265 AC: 40325 AN: 151982 Hom.: 6241 Cov.: 32

Gnomad AFR AF: 0.241

Gnomad AMI AF: 0.364

Gnomad AMR AF: 0.340

Gnomad ASJ AF: 0.219

Gnomad EAS AF: 0.710

Gnomad SAS AF: 0.385

Gnomad FIN AF: 0.230

Gnomad MID AF: 0.263

Gnomad NFE AF: 0.228

Gnomad OTH AF: 0.259

GnomAD4 exome AF: 0.236 AC: 98505 AN: 418094 Hom.: 11756 AF XY: 0.236 AC XY: 46573 AN XY: 197508

Gnomad4 AFR exome AF: 0.242

Gnomad4 AMR exome AF: 0.346

Gnomad4 ASJ exome AF: 0.199

Gnomad4 EAS exome AF: 0.723

Gnomad4 SAS exome AF: 0.371

Gnomad4 FIN exome AF: 0.287

Gnomad4 NFE exome AF: 0.230

Gnomad4 OTH exome AF: 0.259

GnomAD4 genome AF: 0.265 AC: 40382 AN: 152100 Hom.: 6258 Cov.: 32 AF XY: 0.270 AC XY: 20049 AN XY: 74346

Gnomad4 AFR AF: 0.241

Gnomad4 AMR AF: 0.341

Gnomad4 ASJ AF: 0.219

Gnomad4 EAS AF: 0.710

Gnomad4 SAS AF: 0.385

Gnomad4 FIN AF: 0.230

Gnomad4 NFE AF: 0.228

Gnomad4 OTH AF: 0.267

Alfa AF: 0.235 Hom.: 736

Bravo AF: 0.278

Asia WGS AF: 0.558 AC: 1935 AN: 3472

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.87
CADD	Benign	4.0
DANN	Benign	0.63

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: rs11125979; hg19: chr2-63824306;