chr9-94603427-T-C

Position:

• chr9-94603427-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_000507.4(FBP1):​c.971A>G​(p.Asp324Gly) variant causes a missense change involving the alteration of a conserved nucleotide. 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: 32)
• Consequence: FBP1 NM_000507.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.83

Genes affected

FBP1 (HGNC:3606): (fructose-bisphosphatase 1) Fructose-1,6-bisphosphatase 1, a gluconeogenesis regulatory enzyme, catalyzes the hydrolysis of fructose 1,6-bisphosphate to fructose 6-phosphate and inorganic phosphate. Fructose-1,6-diphosphatase deficiency is associated with hypoglycemia and metabolic acidosis. [provided by RefSeq, Jul 2008]

PCAT7 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.924

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FBP1	NM_000507.4	c.971A>G	p.Asp324Gly	missense_variant	7/7	ENST00000375326.9	NP_000498.2
FBP1	NM_001127628.2	c.971A>G	p.Asp324Gly	missense_variant	8/8		NP_001121100.1
FBP1	XM_006717005.5	c.725A>G	p.Asp242Gly	missense_variant	7/7		XP_006717068.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FBP1	ENST00000375326.9	c.971A>G	p.Asp324Gly	missense_variant	7/7	1	NM_000507.4	ENSP00000364475.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Fructose-biphosphatase deficiency Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 27, 2019

This variant is not present in population databases (ExAC no frequency). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with FBP1-related conditions. This sequence change replaces aspartic acid with glycine at codon 324 of the FBP1 protein (p.Asp324Gly). The aspartic acid residue is moderately conserved and there is a moderate physicochemical difference between aspartic acid and glycine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Pathogenic	0.38	D
BayesDel_noAF	Pathogenic	0.31
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.61	.;D;D
Eigen	Uncertain	0.68
Eigen_PC	Uncertain	0.48
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	1.0	D;.;D
M_CAP	Uncertain	0.21	D
MetaRNN	Pathogenic	0.92	D;D;D
MetaSVM	Uncertain	0.59	D
MutationAssessor	Pathogenic	3.9	.;H;H
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.50	T
PROVEAN	Pathogenic	-6.3	.;D;D
REVEL	Pathogenic	0.80
Sift	Uncertain	0.0020	.;D;D
Sift4G	Pathogenic	0.0010	.;D;D
Polyphen		1.0	.;D;D
Vest4		0.92, 0.92
MutPred		0.67		.;Loss of stability (P = 0.0872);Loss of stability (P = 0.0872);
MVP		0.92
MPC		1.1
ClinPred		1.0	D
GERP RS		5.1
Varity_R		0.91
gMVP		0.81

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: rs1827640590; hg19: chr9-97365709;