Genetic Variant FFAR4:p.Arg99Gly (chr10-93567015-C-G) – ACMG Classification: Uncertain_significance (5 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM1PM2PP3

The NM_001195755.2(FFAR4):c.295C>G(p.Arg99Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,459,490 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R99S) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

FFAR4
NM_001195755.2 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 2.46

Publications

0 publications found

Variant links:

Genes affected

FFAR4 (HGNC:19061): (free fatty acid receptor 4) This gene encodes a G protein-coupled receptor (GPR) which belongs to the rhodopsin family of GPRs. The encoded protein functions as a receptor for free fatty acids, including omega-3, and participates in suppressing anti-inflammatory responses and insulin sensitizing. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Feb 2012]

FFAR4 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

PM1

In a mutagenesis_site Impairs LCFA-induced intracellular calcium release. (size 0) in uniprot entity FFAR4_HUMAN

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.78

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FFAR4	NM_001195755.2 link	c.295C>G	p.Arg99Gly	missense_variant	Exon 1 of 3	ENST00000371481.9	NP_001182684.1	Q5NUL3-2B4DWG6
FFAR4	NM_181745.4 link	c.295C>G	p.Arg99Gly	missense_variant	Exon 1 of 4		NP_859529.2	Q5NUL3-1B4DWG6
FFAR4	XM_011539746.4 link	c.295C>G	p.Arg99Gly	missense_variant	Exon 1 of 3		XP_011538048.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
FFAR4	ENST00000371481.9 link	c.295C>G	p.Arg99Gly	missense_variant	Exon 1 of 3	1	NM_001195755.2	ENSP00000360536.5	Q5NUL3-2
FFAR4	ENST00000371483.8 link	c.295C>G	p.Arg99Gly	missense_variant	Exon 1 of 4	1		ENSP00000360538.4	Q5NUL3-1
FFAR4	ENST00000604414.1 link	c.295C>G	p.Arg99Gly	missense_variant	Exon 1 of 3	3		ENSP00000474477.1	S4R3L2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1459490

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726236

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33470

American (AMR)

AF:

0.00

AC:

AN:

44714

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26118

East Asian (EAS)

AF:

0.00

AC:

AN:

39690

South Asian (SAS)

AF:

0.00

AC:

AN:

86250

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51290

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111830

Other (OTH)

AF:

0.00

AC:

AN:

60360

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.94

BayesDel_addAF

Pathogenic

0.23

BayesDel_noAF

Uncertain

0.090

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.31

.;T;.

Eigen

Uncertain

0.54

Eigen_PC

Uncertain

0.54

FATHMM_MKL

Uncertain

0.93

LIST_S2

Uncertain

0.88

D;D;D

M_CAP

Benign

0.040

MetaRNN

Pathogenic

0.78

D;D;D

MetaSVM

Benign

-0.94

MutationAssessor

Uncertain

2.5

M;M;.

PhyloP100

2.5

PrimateAI

Uncertain

0.60

PROVEAN

Uncertain

-3.0

D;D;.

REVEL

Benign

0.29

Sift

Benign

0.13

T;T;.

Sift4G

Uncertain

0.031

D;D;D

Polyphen

1.0

D;D;.

Vest4

0.77

MutPred

0.68

Loss of stability (P = 0.0648);Loss of stability (P = 0.0648);Loss of stability (P = 0.0648);

MVP

0.70

MPC

1.7

ClinPred

1.0

GERP RS

5.2

PromoterAI

0.018

Neutral

(source)

Varity_R

0.87

gMVP

0.58

Mutation Taster

=56/44

polymorphism

(source)

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

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10-93567015-C-G

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over