5-132393676-G-T

Position:

chr5-132393676-G-T

Variant summary

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

The NM_003060.4(SLC22A5):c.1451G>T(p.Gly484Val) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000322 in 1,614,140 control chromosomes in the GnomAD database, with no homozygous occurrence. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00038 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00032 ( 0 hom. )

Consequence

SLC22A5
NM_003060.4 missense, splice_region

Scores

Splicing: ADA: 0.9999

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:10O:1

Conservation

PhyloP100: 9.60

Variant links:

Genes affected

SLC22A5 (HGNC:10969): (solute carrier family 22 member 5) Polyspecific organic cation transporters in the liver, kidney, intestine, and other organs are critical for elimination of many endogenous small organic cations as well as a wide array of drugs and environmental toxins. The encoded protein is a plasma integral membrane protein which functions both as an organic cation transporter and as a sodium-dependent high affinity carnitine transporter. The encoded protein is involved in the active cellular uptake of carnitine. Mutations in this gene are the cause of systemic primary carnitine deficiency (CDSP), an autosomal recessive disorder manifested early in life by hypoketotic hypoglycemia and acute metabolic decompensation, and later in life by skeletal myopathy or cardiomyopathy. Alternative splicing of this gene results in multiple transcript variants. [provided by RefSeq, Apr 2015]

SLC22A5 links:

SLC22A5 (HGNC:):

SLC22A5 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SLC22A5	NM_003060.4 linkuse as main transcript	c.1451G>T	p.Gly484Val	missense_variant, splice_region_variant	9/10	ENST00000245407.8	NP_003051.1	O76082-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SLC22A5	ENST00000245407.8 linkuse as main transcript	c.1451G>T	p.Gly484Val	missense_variant, splice_region_variant	9/10	1	NM_003060.4	ENSP00000245407.3		O76082-1

Frequencies

GnomAD3 genomes

AF:

0.000381

AC:

AN:

152174

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000659

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000750

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000457

AC:

115

AN:

251436

Hom.:

AF XY:

0.000427

AC XY:

AN XY:

135894

show subpopulations

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:

0.0000327

Gnomad FIN exome

AF:

0.00120

Gnomad NFE exome

AF:

0.000739

Gnomad OTH exome

AF:

0.000651

GnomAD4 exome

AF:

0.000316

AC:

462

AN:

1461848

Hom.:

Cov.:

AF XY:

0.000349

AC XY:

254

AN XY:

727218

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.0000383

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00116

Gnomad4 NFE exome

AF:

0.000337

Gnomad4 OTH exome

AF:

0.000348

GnomAD4 genome

AF:

0.000381

AC:

AN:

152292

Hom.:

Cov.:

AF XY:

0.000322

AC XY:

AN XY:

74460

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000659

Gnomad4 NFE

AF:

0.000750

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000505

Hom.:

Bravo

AF:

0.000212

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000581

AC:

ExAC

AF:

0.000478

AC:

EpiCase

AF:

0.000600

EpiControl

AF:

0.000474

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:10Other:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Renal carnitine transport defect

Uncertain:6Other:1

Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -
not provided, no classification provided	phenotyping only	GenomeConnect - Invitae Patient Insights Network	-	Variant interpreted as Uncertain significance and reported on 12-29-2020 by Lab Invitae. GenomeConnect-Invitae Patient Insights Network assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. Registry team members make no attempt to reinterpret the clinical significance of the variant. Phenotypic details are available under supporting information. -
Uncertain significance, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Jan 19, 2018	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Jul 15, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Apr 27, 2017	This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -
Uncertain significance, criteria provided, single submitter	in vitro;research	Giacomini Lab, University of California, San Francisco	Oct 03, 2022	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Oct 18, 2022	This sequence change replaces glycine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 484 of the SLC22A5 protein (p.Gly484Val). This variant is present in population databases (rs28383480, gnomAD 0.1%), and has an allele count higher than expected for a pathogenic variant. This missense change has been observed in individual(s) with primary carnitine deficiency (PMID: 26828774). ClinVar contains an entry for this variant (Variation ID: 203931). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. 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 provided

Pathogenic:1Uncertain:1

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Oct 17, 2024	Reported previously in an individual with primary carnitine deficiency who had no second SLC22A5 variant (PMID: 28841266) and reported as a variant identified from exome sequencing analysis, however no additional information was provided (PMID: 26633542); Published functional studies demonstrate no damaging effect (PMID: 36343260); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 26828774, 18673259, 26633542, 28841266, 34426522, 36343260) -
Likely pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	May 01, 2024	SLC22A5: PP4:Strong, PM2, PM3:Supporting -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Apr 01, 2024

Variant summary: SLC22A5 c.1451G>T (p.Gly484Val) results in a non-conservative amino acid change located in the Major facilitator superfamily domain (IPR020846) of the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. Several computational tools predict a significant impact on normal splicing: Three predict the variant weakens a 3' acceptor site. However, these predictions have yet to be confirmed by functional studies. The variant allele was found at a frequency of 0.00046 in 251436 control chromosomes. This frequency is not significantly higher than estimated for a pathogenic variant in SLC22A5 causing Systemic Primary Carnitine Deficiency (0.00046 vs 0.0046), allowing no conclusion about variant significance. c.1451G>T has been reported in the literature in individuals affected with Systemic Primary Carnitine Deficiency (e.g. Longo_2016, Frigeni_2017), "Abnormality of metabolism/homeostasis" (Retterer_2016), and Sudden Infant Death Syndrome (Neubauer_2017). These reports do not provide unequivocal conclusions about association of the variant with Systemic Primary Carnitine Deficiency. At least one publication reports experimental evidence evaluating an impact on protein function. These results showed no damaging effect of this variant. The following publications have been ascertained in the context of this evaluation (PMID: 26633542, 26828774, 28074886, 28841266, 36343260). ClinVar contains an entry for this variant (Variation ID: 203931). Based on the evidence outlined above, the variant was classified as uncertain significance. -

SLC22A5-related disorder

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Aug 27, 2024

The SLC22A5 c.1451G>T variant is predicted to result in the amino acid substitution p.Gly484Val. This variant was reported in an individual with primary carnitine deficiency and another individual with an abnormality of metabolism/homeostasis; however, no additional segregation or functional evidence was provided (Longo et al. 2016. PubMed ID: 26828774; Retterer et al. 2016. PubMed ID: 26633542). This variant was also reported in a large Turkish sequencing project (Reported as c.1523G>T (p.Gly508Val) in Dataset 4 in Kars et al. 2021. PubMed ID: 34426522). This variant is reported in 0.12% of alleles in individuals of European (Finnish) descent in gnomAD (http://gnomad.broadinstitute.org/variant/5-131729368-G-T). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

High myopia

Uncertain:1

Uncertain significance, no assertion criteria provided

research

Institute of Human Genetics, Polish Academy of Sciences

Dec 17, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.68

BayesDel_addAF

Uncertain

0.025

BayesDel_noAF

Pathogenic

0.22

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.64

D;.

Eigen

Pathogenic

0.83

Eigen_PC

Pathogenic

0.78

FATHMM_MKL

Pathogenic

1.0

LIST_S2

Pathogenic

0.98

D;D

M_CAP

Benign

0.075

MetaRNN

Uncertain

0.69

D;D

MetaSVM

Uncertain

-0.21

MutationAssessor

Uncertain

2.8

M;.

PrimateAI

Uncertain

0.71

PROVEAN

Pathogenic

-6.7

D;D

REVEL

Uncertain

0.53

Sift

Benign

0.093

T;T

Sift4G

Uncertain

0.010

D;T

Polyphen

0.99

D;.

Vest4

0.89

MVP

0.89

MPC

0.86

ClinPred

0.57

GERP RS

5.3

Varity_R

0.88

gMVP

0.91

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.98

SpliceAI score (max)

0.040

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over