M-10159-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM2 PM5 BP4

The ENST00000361227.2(MT-ND3):c.101C>A(p.Ser34Tyr) variant causes a missense change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. 7/11 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S34P) has been classified as Likely pathogenic.

• Frequency: Mitomap GenBank: 𝑓 0.0 (AC: 3)
• Consequence: MT-ND3 ENST00000361227.2 missense
• Scores: Apogee2 Benign 0.14
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1 No linked disesase in Mitomap
• Conservation: PhyloP100: 0.639

Genes affected

MT-ND3 (HGNC:7458): (mitochondrially encoded NADH dehydrogenase 3) Enables NADH dehydrogenase (ubiquinone) activity. Involved in mitochondrial electron transport, NADH to ubiquinone. Part of mitochondrial respiratory chain complex I. Implicated in Leber hereditary optic neuropathy; Leigh disease; and Parkinson's disease. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very low frequency in mitomap database: 0.0
• PM5: Other missense variant is known to change same aminoacid residue: Variant chrnull-null-null-null is described in UniProt as null.
• BP4: Apogee2 supports a benign effect, 0.1375038 < 0.5 .

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MT-ND3	ENST00000361227.2	c.101C>A	p.Ser34Tyr	missense_variant	1/1			P1

Frequencies

GnomAD4 exome Cov.: 0

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

Mitomap GenBank AF: 0.0 AC: 3

Gnomad homoplasmic AF: 0.000018 AC: 1 AN: 56434

Gnomad heteroplasmic AF: 0.0 AC: 0 AN: 56434

Mitomap

No disease associated.

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Leigh syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Wong Mito Lab, Molecular and Human Genetics, Baylor College of Medicine

Oct 17, 2019

The NC_012920.1:m.10159C>A (YP_003024033.1:p.Ser34Tyr) variant in MTND3 gene is interpretated to be a Uncertain Significance variant based on the modified ACMG guidelines (unpublished). This variant meets the following evidence codes: PM9, PP6 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
Apogee2	Benign	0.14
Hmtvar	Pathogenic	0.48
AlphaMissense	Benign	0.22
BayesDel_addAF	Benign	-0.39	T
DEOGEN2	Benign	0.23	T
LIST_S2	Benign	0.52	T
MutationAssessor	Benign	1.3	L
MutationTaster	Benign	1.0	N
PROVEAN	Benign	-1.4	N
Sift	Benign	0.56	T
Sift4G	Benign	0.14	T
GERP RS		0.81
Varity_R		0.14

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1603222701; hg19: chrM-10160;