12-29311054-A-G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001271783.2(FAR2):c.795A>G(p.Ile265Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,194 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 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: 0.0000014 (0 hom.)
• Consequence: FAR2 NM_001271783.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.414

Genes affected

FAR2 (HGNC:25531): (fatty acyl-CoA reductase 2) This gene belongs to the short chain dehydrogenase/reductase superfamily. It encodes a reductase enzyme involved in the first step of wax biosynthesis wherein fatty acids are converted to fatty alcohols. The encoded peroxisomal protein utilizes saturated fatty acids of 16 or 18 carbons as preferred substrates. Alternatively spliced transcript variants have been observed for this gene. Related pseudogenes have been identified on chromosomes 2, 14 and 22. [provided by RefSeq, Nov 2012]

(HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.06261739).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FAR2	NM_001271783.2	c.795A>G	p.Ile265Met	missense_variant	7/12	ENST00000536681.8
LOC100506606	NR_103860.1	n.142-1151T>C		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FAR2	ENST00000536681.8	c.795A>G	p.Ile265Met	missense_variant	7/12	1	NM_001271783.2	P1
	ENST00000553105.1	n.142-1151T>C		intron_variant, non_coding_transcript_variant		2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461194 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 726936

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000468 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

May 27, 2022

The c.795A>G (p.I265M) alteration is located in exon 7 (coding exon 6) of the FAR2 gene. This alteration results from a A to G substitution at nucleotide position 795, causing the isoleucine (I) at amino acid position 265 to be replaced by a methionine (M). 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	0.086
BayesDel_addAF	Benign	-0.31	T
BayesDel_noAF	Benign	-0.68
Cadd	Benign	2.6
Dann	Benign	0.72
DEOGEN2	Benign	0.041	T;T;.
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.63	D
M_CAP	Benign	0.0042	T
MetaRNN	Benign	0.063	T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-0.89	N;N;.
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.31	T
PROVEAN	Benign	1.9	N;N;N
REVEL	Benign	0.12
Sift	Benign	1.0	T;T;T
Sift4G	Benign	1.0	T;T;T
Polyphen		0.0010	B;B;.
Vest4		0.076
MutPred		0.69		Gain of catalytic residue at G260 (P = 0.001);Gain of catalytic residue at G260 (P = 0.001);.;
MVP		0.14
MPC		0.67
ClinPred		0.065	T
GERP RS		-1.1
Varity_R		0.047
gMVP		0.69

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs1949341682; hg19: chr12-29463987;