NM_138773.4:c.196G>T

Variant names:

• chr5-110739315-G-T
• rs758140632
• NM_138773.4:c.196G>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_138773.4(SLC25A46):​c.196G>T​(p.Val66Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000706 in 1,416,874 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. V66V) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000071 (0 hom.)
• Consequence: SLC25A46 NM_138773.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 3.21
• Publications: 0 publications found

Genes affected

SLC25A46 (HGNC:25198): (solute carrier family 25 member 46) This gene encodes a mitochondrial solute carrier protein family member. It functions in promoting mitochondrial fission, and prevents the formation of hyperfilamentous mitochondria. Mutation of this gene results in neuropathy and optic atrophy. [provided by RefSeq, Aug 2016]

SLC25A46 Gene-Disease associations (from GenCC):

• neuropathy, hereditary motor and sensory, type 6B

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae), ClinGen
• pontocerebellar hypoplasia, type 1E

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• hereditary motor and sensory neuropathy type 6

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• pontocerebellar hypoplasia type 1

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• Leigh syndrome

  Inheritance: AR Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.13900882).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_138773.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC25A46	NM_138773.4	MANE Select	c.196G>T	p.Val66Leu	missense	Exon 1 of 8	NP_620128.1
	SLC25A46	NM_001303249.3		c.196G>T	p.Val66Leu	missense	Exon 1 of 8	NP_001290178.1
	SLC25A46	NR_138151.2		n.309G>T		non_coding_transcript_exon	Exon 1 of 9

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC25A46	ENST00000355943.8	TSL:1 MANE Select	c.196G>T	p.Val66Leu	missense	Exon 1 of 8	ENSP00000348211.3
	SLC25A46	ENST00000447245.6	TSL:2	c.196G>T	p.Val66Leu	missense	Exon 1 of 8	ENSP00000399717.2
	SLC25A46	ENST00000513807.5	TSL:2	c.-204+1068G>T		intron	N/A	ENSP00000421134.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00 AC: 0 AN: 175202 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000706 AC: 10 AN: 1416874 Hom.: 0 Cov.: 31 AF XY: 0.00000999 AC XY: 7 AN XY: 700704

African (AFR) AF: 0.00 AC: 0 AN: 32658

American (AMR) AF: 0.00 AC: 0 AN: 37830

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25354

East Asian (EAS) AF: 0.00 AC: 0 AN: 37550

South Asian (SAS) AF: 0.0000124 AC: 1 AN: 80710

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 48880

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5718

European-Non Finnish (NFE) AF: 0.00000826 AC: 9 AN: 1089466

Other (OTH) AF: 0.00 AC: 0 AN: 58708

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Neuropathy, hereditary motor and sensory, type 6B Uncertain:1

Jun 20, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces valine, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 66 of the SLC25A46 protein (p.Val66Leu). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with SLC25A46-related conditions. ClinVar contains an entry for this variant (Variation ID: 475792). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.

Inborn genetic diseases Uncertain:1

Apr 28, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.196G>T (p.V66L) alteration is located in exon 1 (coding exon 1) of the SLC25A46 gene. This alteration results from a G to T substitution at nucleotide position 196, causing the valine (V) at amino acid position 66 to be replaced by a leucine (L). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.43
CADD	Benign	15
DANN	Benign	0.96
DEOGEN2	Benign	0.0076	T
Eigen	Benign	-0.65
Eigen_PC	Benign	-0.61
FATHMM_MKL	Benign	0.11	N
LIST_S2	Benign	0.71	T
M_CAP	Uncertain	0.28	D
MetaRNN	Benign	0.14	T
MetaSVM	Benign	-0.67	T
MutationAssessor	Benign	0.90	L
PhyloP100		3.2
PrimateAI	Uncertain	0.57	T
PROVEAN	Benign	-0.53	N
REVEL	Benign	0.19
Sift	Benign	0.27	T
Sift4G	Benign	0.34	T
Polyphen		0.0060	B
Vest4		0.075
MutPred		0.066		Gain of glycosylation at P63 (P = 0.1607)
MVP		0.67
MPC		0.057
ClinPred		0.64	D
GERP RS		3.2
PromoterAI		0.0033	Neutral
Varity_R		0.11
gMVP		0.29
Mutation Taster		=97/3	polymorphism

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: rs758140632; hg19: chr5-110075016;