1-74201408-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_003838.5(FPGT):c.341C>G(p.Ser114Cys) variant causes a missense, splice region change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: FPGT NM_003838.5 missense, splice_region
• Scores: Splicing: ADA: 0.9829
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.08

Genes affected

FPGT (HGNC:3825): (fucose-1-phosphate guanylyltransferase) L-fucose is a key sugar in glycoproteins and other complex carbohydrates since it may be involved in many of the functional roles of these macromolecules, such as in cell-cell recognition. The fucosyl donor for these fucosylated oligosaccharides is GDP-beta-L-fucose. There are two alternate pathways for the biosynthesis of GDP-fucose; the major pathway converts GDP-alpha-D-mannose to GDP-beta-L-fucose. The protein encoded by this gene participates in an alternate pathway that is present in certain mammalian tissues, such as liver and kidney, and appears to function as a salvage pathway to reutilize L-fucose arising from the turnover of glycoproteins and glycolipids. This pathway involves the phosphorylation of L-fucose to form beta-L-fucose-1-phosphate, and then condensation of the beta-L-fucose-1-phosphate with GTP by fucose-1-phosphate guanylyltransferase to form GDP-beta-L-fucose. Alternative splicing results in multiple transcript variants. Read-through transcription also exists between this gene and the neighboring downstream TNNI3 interacting kinase (TNNI3K) gene. [provided by RefSeq, Dec 2010]

FPGT-TNNI3K (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.804

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FPGT	NM_003838.5	c.341C>G	p.Ser114Cys	missense_variant, splice_region_variant	3/4	ENST00000370898.9
FPGT-TNNI3K	NM_001112808.3	c.341C>G	p.Ser114Cys	missense_variant, splice_region_variant	3/27

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FPGT	ENST00000370898.9	c.341C>G	p.Ser114Cys	missense_variant, splice_region_variant	3/4	1	NM_003838.5	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 25

GnomAD4 genome Cov.: 33

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

Sep 22, 2023

The c.341C>G (p.S114C) alteration is located in exon 3 (coding exon 3) of the FPGT gene. This alteration results from a C to G substitution at nucleotide position 341, causing the serine (S) at amino acid position 114 to be replaced by a cysteine (C). 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	0.29
BayesDel_addAF	Pathogenic	0.27	D
BayesDel_noAF	Pathogenic	0.15
Cadd	Pathogenic	33
Dann	Uncertain	0.99
Eigen	Uncertain	0.65
Eigen_PC	Uncertain	0.65
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.90	D;T;D;D;T;T;T;T;T
M_CAP	Uncertain	0.093	D
MetaRNN	Uncertain	0.72	D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.074	D
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D
REVEL	Uncertain	0.32
Sift4G	Uncertain	0.0050	D;D;D;D;D;D;D;D;D
Vest4		0.77
MutPred		0.73		.;Loss of disorder (P = 0.0072);Loss of disorder (P = 0.0072);.;.;Loss of disorder (P = 0.0072);Loss of disorder (P = 0.0072);Loss of disorder (P = 0.0072);Loss of disorder (P = 0.0072);
MVP		0.79
MPC		0.097
ClinPred		0.94	D
GERP RS		6.0
Varity_R		0.14
gMVP		0.61

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	0.98
dbscSNV1_RF	Benign	0.71
SpliceAI score (max)		0.25		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.25		Position offset: -1

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: chr1-74667092;