Genetic Variant FAM170A:p.Ala41Val (chr5-119632799-C-T) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_001367956.1(FAM170A):c.122C>T(p.Ala41Val) 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 1,460,380 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

FAM170A
NM_001367956.1 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.283

Variant links:

Genes affected

FAM170A (HGNC:27963): (family with sequence similarity 170 member A) Predicted to enable DNA binding activity and metal ion binding activity. Involved in positive regulation of transcription, DNA-templated and transcription by RNA polymerase II. Located in nucleus. [provided by Alliance of Genome Resources, Apr 2022]

FAM170A links:

HSD17B4 (HGNC:5213): (hydroxysteroid 17-beta dehydrogenase 4) The protein encoded by this gene is a bifunctional enzyme that is involved in the peroxisomal beta-oxidation pathway for fatty acids. It also acts as a catalyst for the formation of 3-ketoacyl-CoA intermediates from both straight-chain and 2-methyl-branched-chain fatty acids. Defects in this gene that affect the peroxisomal fatty acid beta-oxidation activity are a cause of D-bifunctional protein deficiency (DBPD). An apparent pseudogene of this gene is present on chromosome 8. Multiple alternatively spliced transcript variants encoding distinct isoforms have been found for this gene. [provided by RefSeq, May 2014]

HSD17B4 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.07894221).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FAM170A	NM_001367956.1 link	c.122C>T	p.Ala41Val	missense_variant	Exon 2 of 5	ENST00000695508.1	NP_001354885.1
FAM170A	NM_182761.4 link	c.122C>T	p.Ala41Val	missense_variant	Exon 2 of 5		NP_877438.2	A1A519-2
FAM170A	NM_001163991.2 link	c.71-1161C>T		intron_variant	Intron 1 of 3		NP_001157463.1	A1A519-3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FAM170A	ENST00000695508.1 link	c.122C>T	p.Ala41Val	missense_variant	Exon 2 of 5		NM_001367956.1	ENSP00000511971.1		A1A519-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1460380

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726422

show subpopulations

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.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Dec 21, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.122C>T (p.A41V) alteration is located in exon 2 (coding exon 2) of the FAM170A gene. This alteration results from a C to T substitution at nucleotide position 122, causing the alanine (A) at amino acid position 41 to be replaced by a valine (V). 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

0.12

BayesDel_addAF

Benign

-0.21

BayesDel_noAF

Benign

-0.54

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.0018

.;T;T

Eigen

Benign

-0.72

Eigen_PC

Benign

-0.78

FATHMM_MKL

Benign

0.026

LIST_S2

Benign

0.45

T;T;T

M_CAP

Benign

0.0067

MetaRNN

Benign

0.079

T;T;T

MetaSVM

Benign

-0.99

MutationAssessor

Benign

1.7

L;L;.

PrimateAI

Benign

0.31

PROVEAN

Benign

-0.40

.;N;N

REVEL

Benign

0.026

Sift

Benign

0.12

.;T;T

Sift4G

Benign

0.21

T;T;T

Polyphen

0.077, 0.25

.;B;B

Vest4

0.31

MutPred

0.25

Gain of sheet (P = 0.0344);Gain of sheet (P = 0.0344);Gain of sheet (P = 0.0344);

MVP

0.014

ClinPred

0.12

GERP RS

2.4

Varity_R

0.043

gMVP

0.059

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

No publications associated with this variant yet.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over