chr7-5500955-C-A

Position:

• chr7-5500955-C-A

Variant summary

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

The NM_024963.6(FBXL18):​c.1314G>T​(p.Gln438His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000216 in 1,386,014 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000022 (0 hom.)
• Consequence: FBXL18 NM_024963.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.0390

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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.13414529).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FBXL18	NM_024963.6	c.1314G>T	p.Gln438His	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.1314G>T	p.Gln438His	missense_variant	3/5	5	NM_024963.6	ENSP00000371805.3
FBXL18	ENST00000458142.1	c.963G>T	p.Gln321His	missense_variant	1/3	2		ENSP00000405896.1
FBXL18	ENST00000415009.5	n.1314G>T		non_coding_transcript_exon_variant	3/7	2		ENSP00000415064.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000216 AC: 3 AN: 1386014 Hom.: 0 Cov.: 30 AF XY: 0.00000293 AC XY: 2 AN XY: 683546

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: 0.00000278

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Alfa AF: 0.000113 Hom.: 0

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

Jan 24, 2024

The c.1314G>T (p.Q438H) 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 1314, causing the glutamine (Q) at amino acid position 438 to be replaced by a histidine (H). 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	-0.21	T
BayesDel_noAF	Benign	-0.54
CADD	Benign	4.7
DANN	Benign	0.60
Eigen	Benign	-0.36
Eigen_PC	Benign	-0.39
FATHMM_MKL	Benign	0.33	N
LIST_S2	Benign	0.74	T
M_CAP	Benign	0.025	T
MetaRNN	Benign	0.13	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.0	L
PrimateAI	Uncertain	0.65	T
PROVEAN	Benign	-0.59	N
REVEL	Benign	0.068
Sift	Benign	0.18	T
Sift4G	Benign	0.12	T
Polyphen		0.59	P
Vest4		0.098
MutPred		0.13		Loss of helix (P = 0.079);
MVP		0.75
MPC		0.50
ClinPred		0.19	T
GERP RS		4.5
gMVP		0.30

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: rs1418338614; hg19: chr7-5540586;