rs749668327

chr6-98905538-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001278716.2(FBXL4):c.991A>G(p.Lys331Glu) variant causes a missense change. The variant allele was found at a frequency of 0.0000178 in 1,461,774 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000018 (0 hom.)
• Consequence: FBXL4 NM_001278716.2 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 5.16

Genes affected

FBXL4 (HGNC:13601): (F-box and leucine rich repeat protein 4) This gene encodes a member of the F-box protein family, which are characterized by an approximately 40 amino acid motif, the F-box. F-box proteins constitute one subunit of modular E3 ubiquitin ligase complexes, called SCF complexes, which function in phosphorylation-dependent ubiquitination. The F-box domain mediates protein-protein interactions and binds directly to S-phase kinase-associated protein 1. In addition to an F-box domain, the encoded protein contains at least 9 tandem leucine-rich repeats. The ubiquitin ligase complex containing the encoded protein may function in cell-cycle control by regulating levels of lysine-specific demethylase 4A. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2013]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.16764015).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FBXL4	NM_001278716.2	c.991A>G	p.Lys331Glu	missense_variant	6/10	ENST00000369244.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FBXL4	ENST00000369244.7	c.991A>G	p.Lys331Glu	missense_variant	6/10	1	NM_001278716.2	P1
FBXL4	ENST00000229971.2	c.991A>G	p.Lys331Glu	missense_variant	5/9	1		P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000239 AC: 6 AN: 251330 Hom.: 0 AF XY: 0.0000221 AC XY: 3 AN XY: 135816

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: 0.000196

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000178 AC: 26 AN: 1461774 Hom.: 0 Cov.: 33 AF XY: 0.0000289 AC XY: 21 AN XY: 727186

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000290

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.0000113

ExAC AF: 0.0000330 AC: 4

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Mitochondrial DNA depletion syndrome 13 Uncertain:1

Uncertain significance, criteria provided, single submitter

reference population

Wong Mito Lab, Molecular and Human Genetics, Baylor College of Medicine

Aug 10, 2017

The NM_012160.4:c.991A>G (NP_036292.2:p.Lys331Glu) [GRCH38: NC_000006.12:g.98905538T>C] variant in FBXL4 gene is interpretated to be a Uncertain Significance - Insufficient Evidence based on ACMG guidelines (PMID: 25741868). This variant meets one or more of the following evidence codes reported in the ACMG-guideline. PM2:This variant is absent in key population databases. Based on this evidence code ClinGen Pathogenicity Calculator (PMID:28081714) suggested that the variant is Uncertain Significance - Insufficient Evidence. -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

May 22, 2023

This sequence change replaces lysine, which is basic and polar, with glutamic acid, which is acidic and polar, at codon 331 of the FBXL4 protein (p.Lys331Glu). This variant is present in population databases (rs749668327, gnomAD 0.02%). This variant has not been reported in the literature in individuals affected with FBXL4-related conditions. ClinVar contains an entry for this variant (Variation ID: 437673). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt FBXL4 protein function. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.34	T
BayesDel_noAF	Benign	-0.47
Cadd	Benign	19
Dann	Uncertain	0.99
DEOGEN2	Benign	0.030	T;T
Eigen	Benign	-0.37
Eigen_PC	Benign	-0.18
FATHMM_MKL	Uncertain	0.85	D
M_CAP	Benign	0.0074	T
MetaRNN	Benign	0.17	T;T
MetaSVM	Benign	-0.94	T
MutationAssessor	Benign	0.90	L;L
MutationTaster	Benign	0.91	N;N
PrimateAI	Uncertain	0.66	T
PROVEAN	Benign	-0.60	N;N
REVEL	Benign	0.057
Sift	Benign	0.24	T;T
Sift4G	Benign	0.67	T;T
Polyphen		0.010	B;B
Vest4		0.45
MutPred		0.40		Loss of ubiquitination at K331 (P = 0.011);Loss of ubiquitination at K331 (P = 0.011);
MVP		0.36
MPC		0.091
ClinPred		0.091	T
GERP RS		4.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.074
gMVP		0.34

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: rs749668327; hg19: chr6-99353414;