rs777474053

Positions:

• chr17-75286692-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001126121.2(SLC25A19):​c.73T>G​(p.Ser25Ala) variant causes a missense change. The variant allele was found at a frequency of 0.0000508 in 1,614,034 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 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. S25S) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.000053 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000051 (0 hom.)
• Consequence: SLC25A19 NM_001126121.2 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:4
• Conservation: PhyloP100: 4.00

Genes affected

SLC25A19 (HGNC:14409): (solute carrier family 25 member 19) This gene encodes a mitochondrial protein that is a member of the solute carrier family. Although this protein was initially thought to be the mitochondrial deoxynucleotide carrier involved in the uptake of deoxynucleotides into the matrix of the mitochondria, further studies have demonstrated that this protein instead functions as the mitochondrial thiamine pyrophosphate carrier, which transports thiamine pyrophosphates into mitochondria. Mutations in this gene cause microcephaly, Amish type, a metabolic disease that results in severe congenital microcephaly, severe 2-ketoglutaric aciduria, and death within the first year. Multiple alternatively spliced variants, encoding the same protein, have been identified for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.20013133).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SLC25A19	NM_001126121.2	c.73T>G	p.Ser25Ala	missense_variant	3/8	ENST00000416858.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SLC25A19	ENST00000416858.7	c.73T>G	p.Ser25Ala	missense_variant	3/8	1	NM_001126121.2	P1

Frequencies

GnomAD3 genomes AF: 0.0000526 AC: 8 AN: 152142 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

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: 0.0000735

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000676 AC: 17 AN: 251468 Hom.: 0 AF XY: 0.0000662 AC XY: 9 AN XY: 135918

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 SAS exome AF: 0.00

Gnomad FIN exome AF: 0.0000462

Gnomad NFE exome AF: 0.000132

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.0000506 AC: 74 AN: 1461892 Hom.: 0 Cov.: 34 AF XY: 0.0000495 AC XY: 36 AN XY: 727246

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.0000447

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0000374

Gnomad4 NFE exome AF: 0.0000450

Gnomad4 OTH exome AF: 0.000265

GnomAD4 genome AF: 0.0000526 AC: 8 AN: 152142 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74330

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.000131

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000735

Gnomad4 OTH AF: 0.00

Alfa AF: 0.0000772 Hom.: 0

Bravo AF: 0.0000642

TwinsUK AF: 0.00 AC: 0

ALSPAC AF: 0.000259 AC: 1

ExAC AF: 0.0000659 AC: 8

EpiCase AF: 0.000109

EpiControl AF: 0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Apr 01, 2019	Not observed at a significant frequency in large population cohorts (Lek et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Aug 10, 2022	This sequence change replaces serine, which is neutral and polar, with alanine, which is neutral and non-polar, at codon 25 of the SLC25A19 protein (p.Ser25Ala). This variant is present in population databases (rs777474053, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with SLC25A19-related conditions. ClinVar contains an entry for this variant (Variation ID: 436748). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The alanine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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. -

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Nov 04, 2015

- -

Amish lethal microcephaly;C3150973:Progressive demyelinating neuropathy with bilateral striatal necrosis Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 31, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Benign	-0.21	T
BayesDel_noAF	Benign	-0.30
CADD	Benign	20
DANN	Benign	0.93
Eigen	Benign	-0.46
Eigen_PC	Benign	-0.24
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Benign	0.75	T;.;.;.;.;T;T;T;T;T;T;T
M_CAP	Benign	0.021	T
MetaRNN	Benign	0.20	T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.88	T
MutationAssessor	Benign	-0.070	N;N;N;N;N;N;.;.;.;.;.;.
MutationTaster	Benign	0.97	D;D;D;D;D;D
PrimateAI	Benign	0.46	T
PROVEAN	Benign	-1.5	N;N;N;N;N;.;.;.;.;.;.;.
REVEL	Benign	0.16
Sift	Benign	0.31	T;T;T;T;T;.;.;.;.;.;.;.
Sift4G	Benign	0.59	T;T;T;T;T;T;.;T;T;.;.;.
Polyphen		0.17	.;B;B;B;B;B;.;.;.;.;.;.
Vest4		0.30
MVP		0.043
MPC		0.13
ClinPred		0.067	T
GERP RS		3.3
Varity_R		0.12
gMVP		0.81

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: rs777474053; hg19: chr17-73282773;