6-25770970-C-T

Variant summary

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

The NM_005495.3(SLC17A4):c.664C>T(p.Leu222Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SLC17A4 NM_005495.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.234

Genes affected

SLC17A4 (HGNC:10932): (solute carrier family 17 member 4) Phosphate homeostasis is maintained by regulating intake, intestinal absorption, bone deposition and resorption, and renal excretion of phosphate. The central molecule in the control of phosphate excretion from the kidney is the sodium/phosphate cotransporter NPT1 (SLC17A1; MIM 182308), which is located in the renal proximal tubule. NPT1 uses the transmembrane electrochemical potential gradient of sodium to transport phosphate across the cell membrane. SLC17A4 is a similar sodium/phosphate cotransporter in the intestinal mucosa that plays an important role in the absorption of phosphate from the intestine (summary by Shibui et al., 1999 [PubMed 10319585]).[supplied by OMIM, Feb 2011]

SLC17A1 (HGNC:):

ACMG classification

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	UniProt
SLC17A4	NM_005495.3	c.664C>T	p.Leu222Phe	missense_variant	6/12	ENST00000377905.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SLC17A4	ENST00000377905.9	c.664C>T	p.Leu222Phe	missense_variant	6/12	1	NM_005495.3	P1
SLC17A4	ENST00000439485.6	c.502C>T	p.Leu168Phe	missense_variant	7/13	5
SLC17A4	ENST00000397076.2	c.135+1780C>T		intron_variant		2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 01, 2022

The c.664C>T (p.L222F) alteration is located in exon 6 (coding exon 5) of the SLC17A4 gene. This alteration results from a C to T substitution at nucleotide position 664, causing the leucine (L) at amino acid position 222 to be replaced by a phenylalanine (F). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.20
BayesDel_addAF	Benign	-0.087	T
BayesDel_noAF	Benign	-0.36
Cadd	Benign	19
Dann	Uncertain	0.99
Eigen	Benign	-0.40
Eigen_PC	Benign	-0.73
FATHMM_MKL	Benign	0.037	N
LIST_S2	Benign	0.71	T;T
M_CAP	Benign	0.048	D
MetaRNN	Uncertain	0.52	D;D
MetaSVM	Uncertain	-0.14	T
MutationTaster	Benign	1.0	D;D;N
PrimateAI	Benign	0.39	T
Sift4G	Uncertain	0.0070	D;D
Polyphen		0.94	.;P
Vest4		0.44
MutPred		0.58		.;Gain of glycosylation at T225 (P = 0.2376);
MVP		0.70
MPC		0.40
ClinPred		0.78	D
GERP RS		-6.8
Varity_R		0.28
gMVP		0.51

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr6-25771198; COSMIC: COSV100930699;