5-148394780-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 1P and 0B. PP2

The NM_205836.3(FBXO38):c.4G>A(p.Gly2Arg) variant causes a missense change. The variant allele was found at a frequency of 0.0000184 in 1,412,978 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000018 (0 hom.)
• Consequence: FBXO38 NM_205836.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 5.15

Genes affected

FBXO38 (HGNC:28844): (F-box protein 38) This gene encodes a large protein that contains an F-box domain and may participate in protein ubiquitination. The encoded protein is a transcriptional co-activator of Krueppel-like factor 7 (Klf7). A heterozygous mutation in this gene was found in individuals with autosomal dominant distal hereditary motor neuronopathy type IID. There is a pseudogene for this gene on chromosome 4. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2013]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PP2: Missense variant where missense usually causes diseases, FBXO38

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FBXO38	NM_205836.3	c.4G>A	p.Gly2Arg	missense_variant	2/22	ENST00000340253.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FBXO38	ENST00000340253.10	c.4G>A	p.Gly2Arg	missense_variant	2/22	5	NM_205836.3	P3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.0000184 AC: 26 AN: 1412978 Hom.: 0 Cov.: 30 AF XY: 0.0000185 AC XY: 13 AN XY: 702358

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000539

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: 0.0000220

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 23, 2021

The p.G2R variant (also known as c.4G>A), located in coding exon 1 of the FBXO38 gene, results from a G to A substitution at nucleotide position 4. The glycine at codon 2 is replaced by arginine, an amino acid with dissimilar properties. This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Distal hereditary motor neuropathy type 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Mar 20, 2022

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"). ClinVar contains an entry for this variant (Variation ID: 946497). This variant has not been reported in the literature in individuals affected with FBXO38-related conditions. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 2 of the FBXO38 protein (p.Gly2Arg). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.94
BayesDel_addAF	Uncertain	0.12	D
BayesDel_noAF	Uncertain	-0.060
Cadd	Pathogenic	27
Dann	Pathogenic	1.0
Eigen	Uncertain	0.61
Eigen_PC	Uncertain	0.65
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Uncertain	0.91	D;D;D;.
M_CAP	Benign	0.031	D
MetaRNN	Uncertain	0.63	D;D;D;D
MetaSVM	Benign	-0.89	T
MutationAssessor	Uncertain	2.1	M;M;M;M
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.79	T
PROVEAN	Uncertain	-2.7	D;D;D;D
REVEL	Benign	0.23
Sift	Uncertain	0.0030	D;D;D;D
Sift4G	Uncertain	0.0080	D;D;D;D
Polyphen		1.0	D;D;D;D
Vest4		0.82
MutPred		0.23		Gain of MoRF binding (P = 0.0462);Gain of MoRF binding (P = 0.0462);Gain of MoRF binding (P = 0.0462);Gain of MoRF binding (P = 0.0462);
MVP		0.30
MPC		1.8
ClinPred		0.88	D
GERP RS		5.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.57
gMVP		0.43

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: rs1272218730; hg19: chr5-147774343;