chrX-153693908-C-T

Variant names:

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PP4_StrongPP3PM2_Supporting

This summary comes from the ClinGen Evidence Repository: The NM_005629.4:c.1145C>T variant in SLC6A8 is a missense variant predicted to cause substitution of Proline for Leucine at amino acid 382 (p.Pro382Leu). This variant is absent from gnomADv2.1.1, and has been reported in two individuals in the literature. In one affected individual in the literature, the ratio of urine Creatine to Creatinine was >99th percentile of normal, and reduced creatine uptake in patient fibroblasts was reported. In silico predictor REVEL suggests this variant will have a damaging / pathogenic effect on the protein (score=0.906). There is a ClinVar entry for this variant (Variation ID: 533700, 1 star review status) with 5 submitters classifying the variant with conflicting interpretations (Pathogenic(3); Likely pathogenic(1); Uncertain significance(1)).In summary, this variant meets the criteria to be classified as Likely Pathogenic for Creatine transporter deficiency based on the ACMG/AMP criteria applied, as specified by the ClinGen Cerebral Creatine Deficiency Syndromes Variant Curation Expert Panel (Specifications Version 1.0): PP4_Strong, PM2_Supporting, PP3. LINK:https://erepo.genome.network/evrepo/ui/classification/CA415086073/MONDO:0010305/027

Frequency

Genomes: not found (cov: 24)

Exomes 𝑓: 0.0 ( 0 hom. 0 hem. )

Failed GnomAD Quality Control

Consequence

SLC6A8
NM_005629.4 missense

Scores

Clinical Significance

Likely pathogenic reviewed by expert panel P:7O:1

Conservation

PhyloP100: 7.78

Variant links:

Genes affected

SLC6A8 (HGNC:11055): (solute carrier family 6 member 8) The protein encoded by this gene is a plasma membrane protein whose function is to transport creatine into and out of cells. Defects in this gene can result in X-linked creatine deficiency syndrome. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2008]

SLC6A8 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

PM2

For more information check the summary or visit ClinGen Evidence Repository.

PP3

For more information check the summary or visit ClinGen Evidence Repository.

PP4

For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SLC6A8	NM_005629.4 link	c.1145C>T	p.Pro382Leu	missense_variant	Exon 8 of 13	ENST00000253122.10	NP_005620.1	P48029-1X5D9C4
SLC6A8	NM_001142805.2 link	c.1115C>T	p.Pro372Leu	missense_variant	Exon 8 of 13		NP_001136277.1	P48029Q59EV7
SLC6A8	NM_001142806.1 link	c.800C>T	p.Pro267Leu	missense_variant	Exon 8 of 13		NP_001136278.1	P48029-4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SLC6A8	ENST00000253122.10 link	c.1145C>T	p.Pro382Leu	missense_variant	Exon 8 of 13	1	NM_005629.4	ENSP00000253122.5		P48029-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

Data not reliable, filtered out with message: AC0;AS_VQSR

AF:

0.00

AC:

AN:

1044291

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

336455

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:7Other:1

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Creatine transporter deficiency

Pathogenic:5Other:1

Oct 30, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces proline, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 382 of the SLC6A8 protein (p.Pro382Leu). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with clinical features of creatine transporter deficiency (PMID: 19188083, 30885608; Invitae). ClinVar contains an entry for this variant (Variation ID: 533700). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt SLC6A8 protein function with a positive predictive value of 80%. Experimental studies have shown that this missense change affects SLC6A8 function (PMID: 22281021, 30885608, 32207963). For these reasons, this variant has been classified as Pathogenic. -

Feb 08, 2019

Institute of Human Genetics, University of Leipzig Medical Center

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Dec 08, 2022

ClinGen Cerebral Creatine Deficiency Syndromes Variant Curation Expert Panel, ClinGen

Significance: Likely pathogenic

Review Status: reviewed by expert panel

Collection Method: curation

The NM_005629.4:c.1145C>T variant in SLC6A8 is a missense variant predicted to cause substitution of Proline for Leucine at amino acid 382 (p.Pro382Leu). This variant is absent from gnomADv2.1.1, and has been reported in two individuals in the literature. In one affected individual in the literature, the ratio of urine Creatine to Creatinine was >99th percentile of normal, and reduced creatine uptake in patient fibroblasts was reported. In silico predictor REVEL suggests this variant will have a damaging / pathogenic effect on the protein (score=0.906). There is a ClinVar entry for this variant (Variation ID: 533700, 1 star review status) with 5 submitters classifying the variant with conflicting interpretations (Pathogenic(3); Likely pathogenic(1); Uncertain significance(1)). In summary, this variant meets the criteria to be classified as Likely Pathogenic for Creatine transporter deficiency based on the ACMG/AMP criteria applied, as specified by the ClinGen Cerebral Creatine Deficiency Syndromes Variant Curation Expert Panel (Specifications Version 1.0): PP4_Strong, PM2_Supporting, PP3. -

National Institute of Neuroscience, National Center of Neurology and Psychiatry

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Oct 06, 2021

Institute of Human Genetics Munich, Klinikum Rechts Der Isar, TU München

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

GenomeConnect-Association for Creatine Deficiencies, Association for Creatine Deficiencies

Significance: not provided

Review Status: no classification provided

Collection Method: phenotyping only

Variant interpreted as Uncertain significance and reported on 01-03-2018 by GTR ID 500031. Assertions are reported exactly as they appear on the patient provided laboratory report. GenomeConnect facilitates ClinVar submission from the Association for Creatine Deficiencies registry and does not attempt to reinterpret the variant. -

not provided

Pathogenic:1

Oct 15, 2024

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); 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: 22281021, 23408511, 33192443, 30885608, 33624935, 19188083, 33911214, 32207963, 37587458, 37662495, 37850681, 34050321) -

Intellectual disability

Pathogenic:1

Aug 03, 2020

Institute of Human Genetics, University of Leipzig Medical Center

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The variant c.1145C>T, p.(Pro382Leu) was identified in an individual with neurodevelopmental disorder (NDD) and classified as Pathogenic according to ACMG guidelines. Inheritance for this variant was M.The variant likely explains the NDD in this individual. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.97

BayesDel_addAF

Pathogenic

0.51

BayesDel_noAF

Pathogenic

0.50

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.54

D;.

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.92

D;D

M_CAP

Pathogenic

0.87

MetaRNN

Pathogenic

0.99

D;D

MetaSVM

Uncertain

0.23

MutationAssessor

Pathogenic

3.2

M;.

PrimateAI

Uncertain

0.76

PROVEAN

Pathogenic

-9.4

D;D

REVEL

Pathogenic

0.91

Sift

Pathogenic

0.0

D;D

Sift4G

Pathogenic

0.0

D;D

Polyphen

1.0

D;.

Vest4

0.94

MutPred

0.89

Loss of disorder (P = 0.038);.;

MVP

0.99

MPC

2.5

ClinPred

1.0

GERP RS

4.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.95

gMVP

0.97

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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