7-5501178-C-A

Position:

• chr7-5501178-C-A

Variant summary

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

The NM_024963.6(FBXL18):​c.1091G>T​(p.Arg364Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000000685 in 1,460,854 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: FBXL18 NM_024963.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.89

Genes affected

FBXL18 (HGNC:21874): (F-box and leucine rich repeat protein 18) The protein encoded by this gene is a member of a family of proteins that contain an approximately 40-amino acid F-box motif. This motif is important for interaction with SKP1 and for targeting some proteins for degradation. The encoded protein has been shown to control the cellular level of FBXL7, a protein that induces mitotic arrest, by targeting it for polyubiquitylation and proteasomal degradation. Members of the F-box protein family, such as FBXL18, are characterized by an approximately 40-amino acid F-box motif. F-box proteins interact with SKP1 through the F box, and they interact with ubiquitination targets through other protein interaction domains. [provided by RefSeq, Mar 2016]

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	Protein	UniProt
FBXL18	NM_024963.6	c.1091G>T	p.Arg364Leu	missense_variant	3/5	ENST00000382368.8	NP_079239.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FBXL18	ENST00000382368.8	c.1091G>T	p.Arg364Leu	missense_variant	3/5	5	NM_024963.6	ENSP00000371805.3
FBXL18	ENST00000458142.1	c.740G>T	p.Arg247Leu	missense_variant	1/3	2		ENSP00000405896.1
FBXL18	ENST00000415009.5	n.1091G>T		non_coding_transcript_exon_variant	3/7	2		ENSP00000415064.1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460854 Hom.: 0 Cov.: 77 AF XY: 0.00000138 AC XY: 1 AN XY: 726674

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.00e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

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 17, 2023

The c.1091G>T (p.R364L) alteration is located in exon 3 (coding exon 3) of the FBXL18 gene. This alteration results from a G to T substitution at nucleotide position 1091, causing the arginine (R) at amino acid position 364 to be replaced by a leucine (L). 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
BayesDel_addAF	Benign	-0.039	T
BayesDel_noAF	Benign	-0.29
CADD	Benign	22
DANN	Uncertain	1.0
Eigen	Benign	-0.17
Eigen_PC	Benign	-0.11
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.93	D
M_CAP	Benign	0.078	D
MetaRNN	Uncertain	0.63	D
MetaSVM	Benign	-0.99	T
MutationAssessor	Uncertain	2.1	M
PrimateAI	Uncertain	0.57	T
PROVEAN	Benign	-2.4	N
REVEL	Benign	0.24
Sift	Uncertain	0.020	D
Sift4G	Uncertain	0.035	D
Polyphen		0.68	P
Vest4		0.63
MutPred		0.57		Loss of helix (P = 0.0093);
MVP		0.72
MPC		1.2
ClinPred		0.94	D
GERP RS		2.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
gMVP		0.80

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: rs774712437; hg19: chr7-5540809; COSMIC: COSV101212110; COSMIC: COSV101212110;