8-144355635-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_012162.4(FBXL6):c.1516G>A(p.Glu506Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000023 in 1,610,868 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000099 (0 hom., cov: 30)
  • Exomes 𝑓: 0.000015 (0 hom.)
• Consequence: FBXL6 NM_012162.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.34

Genes affected

FBXL6 (HGNC:13603): (F-box and leucine rich repeat protein 6) This gene encodes a member of a family of proteins that are characterized by an F-box motif. The encoded protein also contains leucine-rich repeats. F-box-containing proteins comprise one of the subunits of the SCF (SKP1-cullin-F-box) complex, which functions in phosphorylation-dependent ubiquitination. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2013]

SLC52A2 (HGNC:30224): (solute carrier family 52 member 2) This gene encodes a membrane protein which belongs to the riboflavin transporter family. In humans, riboflavin must be obtained by intestinal absorption because it cannot be synthesized by the body. The water-soluble vitamin riboflavin is processed to the coenzymes flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD) which then act as intermediaries in many cellular metabolic reactions. Paralogous members of the riboflavin transporter gene family are located on chromosomes 17 and 20. Unlike other members of this family, this gene has higher expression in brain tissue than small intestine. Alternative splicing of this gene results in multiple transcript variants encoding the same protein. Mutations in this gene have been associated with Brown-Vialetto-Van Laere syndrome 2 - an autosomal recessive progressive neurologic disorder characterized by deafness, bulbar dysfunction, and axial and limb hypotonia. [provided by RefSeq, Jul 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.31801355).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FBXL6	NM_012162.4	c.1516G>A	p.Glu506Lys	missense_variant	9/9	ENST00000331890.6
FBXL6	NM_024555.6	c.1498G>A	p.Glu500Lys	missense_variant	9/9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FBXL6	ENST00000331890.6	c.1516G>A	p.Glu506Lys	missense_variant	9/9	1	NM_012162.4	P2

Frequencies

GnomAD3 genomes AF: 0.0000986 AC: 15 AN: 152098 Hom.: 0 Cov.: 30

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000655

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.000956

GnomAD3 exomes AF: 0.0000202 AC: 5 AN: 247828 Hom.: 0 AF XY: 0.0000371 AC XY: 5 AN XY: 134812

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: 0.000131

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.000165

GnomAD4 exome AF: 0.0000151 AC: 22 AN: 1458770 Hom.: 0 Cov.: 29 AF XY: 0.0000220 AC XY: 16 AN XY: 725696

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000157

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000831

GnomAD4 genome AF: 0.0000986 AC: 15 AN: 152098 Hom.: 0 Cov.: 30 AF XY: 0.000148 AC XY: 11 AN XY: 74276

Gnomad4 AFR AF: 0.0000483

Gnomad4 AMR AF: 0.000655

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.000956

Alfa AF: 0.0000434 Hom.: 0

Bravo AF: 0.000196

ExAC AF: 0.00000825 AC: 1

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

Jun 22, 2023

The c.1516G>A (p.E506K) alteration is located in exon 9 (coding exon 9) of the FBXL6 gene. This alteration results from a G to A substitution at nucleotide position 1516, causing the glutamic acid (E) at amino acid position 506 to be replaced by a lysine (K). 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
AlphaMissense	Pathogenic	0.82
BayesDel_addAF	Benign	-0.19	T
BayesDel_noAF	Benign	-0.28
Cadd	Uncertain	24
Dann	Uncertain	1.0
Eigen	Benign	-0.054
Eigen_PC	Benign	0.026
FATHMM_MKL	Uncertain	0.91	D
M_CAP	Uncertain	0.13	D
MetaRNN	Benign	0.32	T;T
MetaSVM	Benign	-0.74	T
MutationTaster	Benign	0.59	N;N
PrimateAI	Uncertain	0.70	T
PROVEAN	Benign	-0.85	N;N
REVEL	Benign	0.14
Sift	Benign	0.10	T;T
Sift4G	Benign	0.13	T;T
Vest4		0.47
MutPred		0.56		.;Gain of MoRF binding (P = 0.0064);
MVP		0.73
MPC		0.25
ClinPred		0.18	T
GERP RS		2.9
gMVP		0.51

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: rs781879109; hg19: chr8-145579295;