NM_001003841.3:c.1173+2T>G

Variant names:

• chr5-1216947-T-G
• rs142979576
• NM_001003841.3:c.1173+2T>G

Variant summary

Our verdict is Pathogenic. The variant received 16 ACMG points: 16P and 0B. PVS1 PP5_Very_Strong

The NM_001003841.3(SLC6A19):​c.1173+2T>G variant causes a splice donor, intron change. The variant allele was found at a frequency of 0.000267 in 1,612,406 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency:
  • Genomes: 𝑓 0.00024 (0 hom., cov: 35)
  • Exomes 𝑓: 0.00027 (0 hom.)
• Consequence: SLC6A19 NM_001003841.3 splice_donor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:11
• Conservation: PhyloP100: 5.46
• Publications: 6 publications found

Genes affected

SLC6A19 (HGNC:27960): (solute carrier family 6 member 19) This gene encodes a system B(0) transmembrane protein that actively transports most neutral amino acids across the apical membrane of epithelial cells. Mutations in this gene may result in Hartnup disorder, an inherited disease with symptoms such as pellagra, cerebellar ataxia, and psychosis. The expression and function of B0AT1 (SLC6A19) in intestinal cells depends on the presence of the accessory protein angiotensin-converting enzyme 2 (ACE2) which, among other functions, acts as a chaperone for membrane trafficking of B0AT1. The ACE2 is also the cellular receptor for severe acute respiratory syndrome-coronavirus (SARS-CoV) and for SARS-CoV-2 that is causing the coronavirus 2019 (COVID-19) pandemic [provided by RefSeq, Jul 2020]

SLC6A19 Gene-Disease associations (from GenCC):

• Hartnup disease

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Orphanet, Labcorp Genetics (formerly Invitae), ClinGen

ACMG classification

Our verdict: Pathogenic. The variant received 16 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.
• PP5: Variant 5-1216947-T-G is Pathogenic according to our data. Variant chr5-1216947-T-G is described in ClinVar as Pathogenic. ClinVar VariationId is 449553.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SLC6A19	NM_001003841.3	c.1173+2T>G		splice_donor_variant, intron_variant	Intron 8 of 11	ENST00000304460.11	NP_001003841.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SLC6A19	ENST00000304460.11	c.1173+2T>G		splice_donor_variant, intron_variant	Intron 8 of 11	1	NM_001003841.3	ENSP00000305302.10
SLC6A19	ENST00000515652.5	n.*118+2T>G		splice_donor_variant, intron_variant	Intron 7 of 10	2		ENSP00000425701.1

Frequencies

GnomAD3 genomes AF: 0.000237 AC: 36 AN: 152218 Hom.: 0 Cov.: 35

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000654

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00141

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000265

Gnomad OTH AF: 0.000478

GnomAD2 exomes AF: 0.000296 AC: 74 AN: 249668 AF XY: 0.000303

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: 0.000557

Gnomad NFE exome AF: 0.000535

Gnomad OTH exome AF: 0.000327

GnomAD4 exome AF: 0.000271 AC: 395 AN: 1460188 Hom.: 0 Cov.: 36 AF XY: 0.000270 AC XY: 196 AN XY: 726400

African (AFR) AF: 0.0000299 AC: 1 AN: 33454

American (AMR) AF: 0.0000224 AC: 1 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26134

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86208

European-Finnish (FIN) AF: 0.000760 AC: 40 AN: 52654

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5064

European-Non Finnish (NFE) AF: 0.000305 AC: 339 AN: 1111958

Other (OTH) AF: 0.000232 AC: 14 AN: 60292

GnomAD4 genome AF: 0.000237 AC: 36 AN: 152218 Hom.: 0 Cov.: 35 AF XY: 0.000323 AC XY: 24 AN XY: 74366

African (AFR) AF: 0.0000241 AC: 1 AN: 41454

American (AMR) AF: 0.0000654 AC: 1 AN: 15286

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5194

South Asian (SAS) AF: 0.00 AC: 0 AN: 4838

European-Finnish (FIN) AF: 0.00141 AC: 15 AN: 10628

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.000265 AC: 18 AN: 68026

Other (OTH) AF: 0.000478 AC: 1 AN: 2092

Alfa AF: 0.000115 Hom.: 0

Bravo AF: 0.000102

ESP6500AA AF: 0.000227 AC: 1

ESP6500EA AF: 0.000233 AC: 2

ExAC AF: 0.000461 AC: 56

EpiCase AF: 0.000164

EpiControl AF: 0.000356

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:11

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:6

-

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Oct 30, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change affects a donor splice site in intron 8 of the SLC6A19 gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in SLC6A19 are known to be pathogenic (PMID: 15286787, 15286788). This variant is present in population databases (rs142979576, gnomAD 0.07%). Disruption of this splice site has been observed in individuals with Hartnup disorder (PMID: 15286787, 15286788). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 449553). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. For these reasons, this variant has been classified as Pathogenic. -

Jun 06, 2025

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Observed in siblings with features of Hartnup disorder who also possessed a second SLC6A19 variant (PMID: 15286788); Canonical splice site variant predicted to result in a null allele in a gene for which loss of function is a known mechanism of disease; Also known as IVS8+2T>G; This variant is associated with the following publications: (PMID: 25525159, 25082825, 31589614, 31908951, 15286788, 33144682, 15286787, 18484095) -

-

Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

-

Genome Diagnostics Laboratory, University Medical Center Utrecht

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Mar 06, 2024

Clinical Genetics Laboratory, Skane University Hospital Lund

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Neutral 1 amino acid transport defect Pathogenic:4

Sep 01, 2004

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Jan 24, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Dec 01, 2021

Revvity Omics, Revvity

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Apr 14, 2023

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

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: SLC6A19 c.1173+2T>G is located in a canonical splice-site and is predicted to affect mRNA splicing resulting in a significantly altered protein due to either exon skipping, shortening, or inclusion of intronic material. Several computational tools predict a significant impact on normal splicing: Four predict the variant abolishes the canonical 5' splicing donor site. However, these predictions have yet to be confirmed by functional studies. The variant allele was found at a frequency of 0.0003 in 249668 control chromosomes. This frequency does not allow conclusions about variant significance. c.1173+2T>G has been reported in the literature as a homozygous or compound heterozygous genotype in multiple individuals affected with Hartnup Disease (example, Kleta_2004, Azamov_2008). These data indicate that the variant is very likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Four clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

SLC6A19-related disorder Pathogenic:1

Jan 05, 2024

PreventionGenetics, part of Exact Sciences

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

The SLC6A19 c.1173+2T>G variant is predicted to disrupt the GT donor site and interfere with normal splicing. This variant has been reported in the compound heterozygous and homozygous states in multiple individuals with Hartnup disorder (Table 1, Seow et al. 2004. PubMed ID: 15286788; Kleta et al. 2004. PubMed ID: 15286787). This variant is reported in 0.068% of alleles in individuals of European (Finnish) descent in gnomAD (http://gnomad.broadinstitute.org/variant/5-1217062-T-G). Variants that disrupt the consensus splice donor site in SLC6A19 are expected to be pathogenic. This variant is interpreted as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.36	D
BayesDel_noAF	Benign	-0.18
CADD	Uncertain	25
DANN	Benign	0.93
Eigen	Uncertain	0.61
Eigen_PC	Uncertain	0.33
FATHMM_MKL	Pathogenic	0.97	D
PhyloP100		5.5
GERP RS		3.7
Mutation Taster		=5/95	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.89
SpliceAI score (max)		0.98		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.23		Position offset: 2
DS_DL_spliceai		0.98		Position offset: -2

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

Other links and lift over

dbSNP: rs142979576; hg19: chr5-1217062;