Genetic Variant FAM170B:p.Ser174Asn (chr10-49131944-C-T) – 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_001164484.2(FAM170B):c.521G>A(p.Ser174Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000286 in 1,398,488 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/20 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: 0.0000029 ( 0 hom. )

Consequence

FAM170B
NM_001164484.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.244

Variant links:

Genes affected

FAM170B (HGNC:19736): (family with sequence similarity 170 member B) Predicted to be involved in fertilization; positive regulation of acrosome reaction; and regulation of fertilization. Located in acrosomal vesicle. [provided by Alliance of Genome Resources, Apr 2022]

FAM170B links:

FAM170B-AS1 (HGNC:45006): (FAM170B antisense RNA 1)

FAM170B-AS1 links:

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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=0.046213478).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FAM170B	NM_001164484.2 link	c.521G>A	p.Ser174Asn	missense_variant	Exon 2 of 2	ENST00000311787.6	NP_001157956.1	A6NMN3
FAM170B-AS1	NR_038973.1 link	n.439-3712C>T		intron_variant	Intron 1 of 5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
FAM170B	ENST00000311787.6 link	c.521G>A	p.Ser174Asn	missense_variant	Exon 2 of 2	1	NM_001164484.2	ENSP00000308292.6	A6NMN3
FAM170B-AS1	ENST00000435809.1 link	n.192-3933C>T		intron_variant	Intron 1 of 2	3
FAM170B-AS1	ENST00000442525.5 link	n.439-3712C>T		intron_variant	Intron 1 of 5	2
FAM170B-AS1	ENST00000443389.5 link	n.434-9309C>T		intron_variant	Intron 1 of 5	5

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000286

AC:

AN:

1398488

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

689808

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:

0.0000126

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000185

Gnomad4 OTH exome

AF:

0.0000172

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

Jan 30, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.521G>A (p.S174N) alteration is located in exon 2 (coding exon 2) of the FAM170B gene. This alteration results from a G to A substitution at nucleotide position 521, causing the serine (S) at amino acid position 174 to be replaced by an asparagine (N). 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

0.095

BayesDel_addAF

Benign

-0.40

BayesDel_noAF

Benign

-0.82

CADD

Benign

1.8

DANN

Benign

0.70

DEOGEN2

Benign

0.0025

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.0

FATHMM_MKL

Benign

0.046

LIST_S2

Benign

0.30

M_CAP

Benign

0.0033

MetaRNN

Benign

0.046

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.69

PrimateAI

Benign

0.25

PROVEAN

Benign

-0.53

REVEL

Benign

0.060

Sift

Benign

0.30

Sift4G

Benign

0.54

Polyphen

0.013

Vest4

0.074

MutPred

0.25

Loss of phosphorylation at S174 (P = 0.0427);

MVP

0.030

ClinPred

0.072

GERP RS

2.8

Varity_R

0.036

gMVP

0.046

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