1-74198286-C-G

Variant names:

• chr1-74198286-C-G
• rs766611619
• NM_003838.5:c.8C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_003838.5(FPGT):​c.8C>G​(p.Ala3Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A3D) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: FPGT NM_003838.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.805
• Publications: 0 publications found

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:42952): (FPGT-TNNI3K readthrough) Enables protein C-terminus binding activity; protein kinase activity; and troponin I binding activity. Involved in protein phosphorylation and regulation of heart contraction. Located in cytoplasm and nucleus. [provided by Alliance of Genome Resources, Apr 2022]

LRRIQ3 (HGNC:28318): (leucine rich repeats and IQ motif containing 3)

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.089582086).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FPGT	NM_003838.5	c.8C>G	p.Ala3Gly	missense_variant	Exon 1 of 4	ENST00000370898.9	NP_003829.4
LRRIQ3	NM_001105659.2	c.-291G>C		upstream_gene_variant		ENST00000354431.9	NP_001099129.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FPGT	ENST00000370898.9	c.8C>G	p.Ala3Gly	missense_variant	Exon 1 of 4	1	NM_003838.5	ENSP00000359935.4
FPGT-TNNI3K	ENST00000557284.7	c.8C>G	p.Ala3Gly	missense_variant	Exon 1 of 27	2		ENSP00000450895.3
LRRIQ3	ENST00000354431.9	c.-291G>C		upstream_gene_variant		5	NM_001105659.2	ENSP00000346414.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.060
CADD	Benign	20
DANN	Uncertain	0.99
Eigen	Benign	-0.68
Eigen_PC	Benign	-0.76
FATHMM_MKL	Benign	0.12	N
LIST_S2	Benign	0.67	T;T;T;T;T;T;T;T;T;T
M_CAP	Benign	0.017	T
MetaRNN	Benign	0.090	T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.96	T
MutationAssessor	Benign	1.9	.;.;L;.;L;.;.;.;.;.
PhyloP100		0.81
PROVEAN	Benign	-1.0	.;.;N;N;N;.;N;N;N;N
REVEL	Benign	0.26
Sift	Uncertain	0.021	.;.;D;D;T;.;D;D;T;D
Sift4G	Benign	0.13	T;D;D;D;D;D;D;D;D;D
Vest4		0.32
MutPred		0.14		.;.;Loss of stability (P = 0.0331);Loss of stability (P = 0.0331);Loss of stability (P = 0.0331);.;Loss of stability (P = 0.0331);Loss of stability (P = 0.0331);Loss of stability (P = 0.0331);Loss of stability (P = 0.0331);
MVP		0.45
MPC		0.023
ClinPred		0.23	T
GERP RS		1.3
PromoterAI		-0.25	Neutral
Varity_R		0.071
gMVP		0.30
Mutation Taster		=87/13	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs766611619; hg19: chr1-74663970;