8-43056368-G-A

Variant names:

• chr8-43056368-G-A
• rs1810397454
• NM_002027.3:c.22G>A

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_Moderate BS2

The NM_002027.3(FNTA):​c.22G>A​(p.Gly8Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000092 in 1,304,948 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/20 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: 0.0000092 (0 hom.)
• Consequence: FNTA NM_002027.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.34

Genes affected

FNTA (HGNC:3782): (farnesyltransferase, CAAX box, alpha) Prenyltransferases can attach either a farnesyl group or a geranylgeranyl group in thioether linkage to the cysteine residue of proteins with a C-terminal CAAX box. CAAX geranylgeranyltransferase and CAAX farnesyltransferase are heterodimers that share the same alpha subunit but have different beta subunits. This gene encodes the alpha subunit of these transferases. Alternative splicing results in multiple transcript variants. Related pseudogenes have been identified on chromosomes 11 and 13. [provided by RefSeq, May 2010]

ENSG00000254673 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -6 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.23757216).
• BS2: High AC in GnomAdExome4 at 12 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FNTA	NM_002027.3	c.22G>A	p.Gly8Arg	missense_variant	Exon 1 of 9	ENST00000302279.8	NP_002018.1
FNTA	NR_033698.2	n.46G>A		non_coding_transcript_exon_variant	Exon 1 of 8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FNTA	ENST00000302279.8	c.22G>A	p.Gly8Arg	missense_variant	Exon 1 of 9	1	NM_002027.3	ENSP00000303423.3
ENSG00000254673	ENST00000534420.1	n.71-2724G>A		intron_variant	Intron 1 of 5	4		ENSP00000435061.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000920 AC: 12 AN: 1304948 Hom.: 0 Cov.: 30 AF XY: 0.00000624 AC XY: 4 AN XY: 641112

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: 0.0000115

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000936 Hom.: 0

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Nov 13, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.22G>A (p.G8R) alteration is located in exon 1 (coding exon 1) of the FNTA gene. This alteration results from a G to A substitution at nucleotide position 22, causing the glycine (G) at amino acid position 8 to be replaced by an arginine (R). 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	Benign	0.32
BayesDel_addAF	Benign	0.0085	T
BayesDel_noAF	Benign	-0.23
CADD	Benign	19
DANN	Uncertain	0.98
DEOGEN2	Benign	0.053	T;.
Eigen	Benign	-0.43
Eigen_PC	Benign	-0.39
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Benign	0.71	T;T
M_CAP	Pathogenic	0.63	D
MetaRNN	Benign	0.24	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.69	N;.
PrimateAI	Pathogenic	0.83	D
PROVEAN	Benign	-0.18	N;N
REVEL	Benign	0.17
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		0.81	P;.
Vest4		0.33
MutPred		0.30		Loss of loop (P = 0.0112);.;
MVP		0.21
MPC		0.26
ClinPred		0.66	D
GERP RS		2.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.084
gMVP		0.28

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: rs1810397454; hg19: chr8-42911511;