Genetic Variant FADS6:p.Arg275Leu (chr17-74879540-C-A) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_178128.6(FADS6):c.824G>T(p.Arg275Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000113 in 1,613,446 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R275Q) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00067 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000055 ( 1 hom. )

Consequence

FADS6
NM_178128.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.59

Variant links:

Genes affected

FADS6 (HGNC:30459): (fatty acid desaturase 6) Predicted to enable oxidoreductase activity, acting on paired donors, with oxidation of a pair of donors resulting in the reduction of molecular oxygen to two molecules of water. Predicted to be involved in lipid metabolic process. Predicted to be integral component of membrane. [provided by Alliance of Genome Resources, Apr 2022]

FADS6 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

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=0.03998846).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FADS6	NM_178128.6 link	c.824G>T	p.Arg275Leu	missense_variant	Exon 5 of 6	ENST00000612771.5	NP_835229.3	Q8N9I5A0A087WYB9
FADS6	XM_005257224.6 link	c.824G>T	p.Arg275Leu	missense_variant	Exon 5 of 7		XP_005257281.2
FADS6	XM_017024458.3 link	c.770G>T	p.Arg257Leu	missense_variant	Exon 6 of 8		XP_016879947.1
FADS6	XM_047435759.1 link	c.365G>T	p.Arg122Leu	missense_variant	Exon 4 of 6		XP_047291715.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
FADS6	ENST00000612771.5 link	c.824G>T	p.Arg275Leu	missense_variant	Exon 5 of 6	1	NM_178128.6	ENSP00000481684.1	A0A087WYB9
FADS6	ENST00000579663.1 link	c.407G>T	p.Arg136Leu	missense_variant	Exon 3 of 3	3		ENSP00000464267.1	J3QRK6
FADS6	ENST00000413142.2 link	n.399G>T		non_coding_transcript_exon_variant	Exon 2 of 3	2

Frequencies

GnomAD3 genomes

AF:

0.000670

AC:

102

AN:

152146

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00244

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.00

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000169

AC:

AN:

248450

Hom.:

AF XY:

0.000126

AC XY:

AN XY:

134958

show subpopulations

Gnomad AFR exome

AF:

0.00272

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000554

AC:

AN:

1461182

Hom.:

Cov.:

AF XY:

0.0000426

AC XY:

AN XY:

726858

show subpopulations

Gnomad4 AFR exome

AF:

0.00221

Gnomad4 AMR exome

AF:

0.0000224

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:

0.00

Gnomad4 OTH exome

AF:

0.0000995

GnomAD4 genome

AF:

0.000670

AC:

102

AN:

152264

Hom.:

Cov.:

AF XY:

0.000658

AC XY:

AN XY:

74464

show subpopulations

Gnomad4 AFR

AF:

0.00243

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000218

Hom.:

Bravo

AF:

0.000703

ESP6500AA

AF:

0.00291

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000174

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Nov 06, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.770G>T (p.R257L) alteration is located in exon 5 (coding exon 5) of the FADS6 gene. This alteration results from a G to T substitution at nucleotide position 770, causing the arginine (R) at amino acid position 257 to be replaced by a leucine (L). 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

-0.18

BayesDel_noAF

Uncertain

-0.040

CADD

Uncertain

DANN

Uncertain

1.0

Eigen

Uncertain

0.49

Eigen_PC

Uncertain

0.39

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.86

D;D;D

M_CAP

Uncertain

0.11

MetaRNN

Benign

0.040

T;T;T

MetaSVM

Benign

-1.1

PrimateAI

Uncertain

0.55

Sift4G

Pathogenic

0.0

D;D;D

Vest4

0.86

MVP

0.34

ClinPred

0.19

GERP RS

5.5

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over