2-63606679-G-T

Variant names:

• chr2-63606679-G-T
• rs262473
• NM_005917.4:c.880-183G>T

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_005917.4(MDH1):​c.880-183G>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.803 in 151,842 control chromosomes in the GnomAD database, including 49,638 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 0.80 (49638 hom., cov: 30)
• Consequence: MDH1 NM_005917.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.0210
• Publications: 3 publications found

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]

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]

WDPCP Gene-Disease associations (from GenCC):

• Bardet-Biedl syndrome 15

  Inheritance: AR Classification: DEFINITIVE, STRONG, LIMITED Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
• Bardet-Biedl syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• heart defect - tongue hamartoma - polysyndactyly syndrome

  Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.88).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.959 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MDH1	NM_005917.4	c.880-183G>T		intron_variant	Intron 8 of 8	ENST00000233114.13	NP_005908.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MDH1	ENST00000233114.13	c.880-183G>T		intron_variant	Intron 8 of 8	1	NM_005917.4	ENSP00000233114.8

Frequencies

GnomAD3 genomes AF: 0.803 AC: 121823 AN: 151724 Hom.: 49568 Cov.: 30

Gnomad AFR AF: 0.922

Gnomad AMI AF: 0.840

Gnomad AMR AF: 0.823

Gnomad ASJ AF: 0.795

Gnomad EAS AF: 0.982

Gnomad SAS AF: 0.833

Gnomad FIN AF: 0.780

Gnomad MID AF: 0.759

Gnomad NFE AF: 0.715

Gnomad OTH AF: 0.766

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.803 AC: 121957 AN: 151842 Hom.: 49638 Cov.: 30 AF XY: 0.807 AC XY: 59880 AN XY: 74212

African (AFR) AF: 0.922 AC: 38235 AN: 41476

American (AMR) AF: 0.824 AC: 12574 AN: 15264

Ashkenazi Jewish (ASJ) AF: 0.795 AC: 2759 AN: 3472

East Asian (EAS) AF: 0.982 AC: 5083 AN: 5178

South Asian (SAS) AF: 0.834 AC: 4013 AN: 4814

European-Finnish (FIN) AF: 0.780 AC: 8116 AN: 10408

Middle Eastern (MID) AF: 0.765 AC: 225 AN: 294

European-Non Finnish (NFE) AF: 0.715 AC: 48566 AN: 67918

Other (OTH) AF: 0.769 AC: 1623 AN: 2110

Alfa AF: 0.752 Hom.: 5767

Bravo AF: 0.810

Asia WGS AF: 0.902 AC: 3106 AN: 3444

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.88
CADD	Benign	5.1
DANN	Benign	0.42
PhyloP100		0.021
Mutation Taster		=100/0	polymorphism (auto)

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: rs262473; hg19: chr2-63833813;