chr14-22774371-G-A

Position:

• chr14-22774371-G-A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_003982.4(SLC7A7):​c.1228C>T​(p.Arg410Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000684 in 1,461,878 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. R410R) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000068 (0 hom.)
• Consequence: SLC7A7 NM_003982.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3 O:1
• Conservation: PhyloP100: 0.787

Genes affected

SLC7A7 (HGNC:11065): (solute carrier family 7 member 7) The protein encoded by this gene is the light subunit of a cationic amino acid transporter. This sodium-independent transporter is formed when the light subunit encoded by this gene dimerizes with the heavy subunit transporter protein SLC3A2. This transporter is found in epithelial cell membranes where it transfers cationic and large neutral amino acids from the cell to the extracellular space. Defects in this gene are a cause of lysinuric protein intolerance (LPI). Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2011]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 14-22774371-G-A is Pathogenic according to our data. Variant chr14-22774371-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 6212.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr14-22774371-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SLC7A7	NM_003982.4	c.1228C>T	p.Arg410Ter	stop_gained	8/10	ENST00000674313.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SLC7A7	ENST00000674313.1	c.1228C>T	p.Arg410Ter	stop_gained	8/10		NM_003982.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251312 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135828

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: 0.00

Gnomad NFE exome AF: 0.00000880

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000684 AC: 10 AN: 1461878 Hom.: 0 Cov.: 32 AF XY: 0.00000963 AC XY: 7 AN XY: 727240

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000504

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000450

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

TwinsUK AF: 0.00 AC: 0

ALSPAC AF: 0.000259 AC: 1

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Lysinuric protein intolerance Pathogenic:3 Other:1

Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Feb 17, 2024	- -
Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Aug 11, 2023	This sequence change creates a premature translational stop signal (p.Arg410*) in the SLC7A7 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in SLC7A7 are known to be pathogenic (PMID: 10631139, 17764084). For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 6212). This premature translational stop signal has been observed in individual(s) with lysinuric protein intolerance (PMID: 10980538, 26865117). It has also been observed to segregate with disease in related individuals. This variant is present in population databases (rs121908678, gnomAD 0.0009%). -
Pathogenic, no assertion criteria provided	literature only	OMIM	Jan 01, 2008	- -
not provided, no classification provided	literature only	GeneReviews	-	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.35
CADD	Pathogenic	38
DANN	Uncertain	0.99
Eigen	Uncertain	0.24
Eigen_PC	Benign	-0.023
FATHMM_MKL	Benign	0.73	D
MutationTaster	Benign	1.0	A;A;A;A;A;A
Vest4		0.93
GERP RS		-0.80

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: rs121908678; hg19: chr14-23243580; COSMIC: COSV53538261; COSMIC: COSV53538261;