rs148480631

Positions:

• chr1-240092640-G-A

Variant summary

Our verdict is Benign. Variant got -19 ACMG points: 0P and 19B. BP4_Moderate BP6_Very_Strong BP7 BS1 BS2

The NM_020066.5(FMN2):​c.531G>A​(p.Ser177=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000631 in 1,614,104 control chromosomes in the GnomAD database, including 5 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0028 (2 hom., cov: 33)
  • Exomes 𝑓: 0.00040 (3 hom.)
• Consequence: FMN2 NM_020066.5 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: -0.405

Genes affected

FMN2 (HGNC:14074): (formin 2) This gene is a member of the formin homology protein family. The encoded protein is thought to have essential roles in organization of the actin cytoskeleton and in cell polarity. This protein mediates the formation of an actin mesh that positions the spindle during oogenesis and also regulates the formation of actin filaments in the nucleus. This protein also forms a perinuclear actin/focal-adhesion system that regulates the shape and position of the nucleus during cell migration. Mutations in this gene have been associated with infertility and also with an autosomal recessive form of intellectual disability (MRT47). Alternatively spliced transcript variants have been identified. [provided by RefSeq, Jul 2017]

ACMG classification

Verdict is Benign. Variant got -19 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.4).
• BP6: Variant 1-240092640-G-A is Benign according to our data. Variant chr1-240092640-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 435214.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-240092640-G-A is described in Lovd as [Likely_benign].
• BP7: Synonymous conserved (PhyloP=-0.405 with no splicing effect.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0028 (426/152298) while in subpopulation AFR AF= 0.0095 (395/41568). AF 95% confidence interval is 0.00873. There are 2 homozygotes in gnomad4. There are 185 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FMN2	NM_020066.5	c.531G>A	p.Ser177=	synonymous_variant	1/18	ENST00000319653.14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FMN2	ENST00000319653.14	c.531G>A	p.Ser177=	synonymous_variant	1/18	5	NM_020066.5	P1
FMN2	ENST00000447095.5	c.-87+24567G>A		intron_variant		3

Frequencies

GnomAD3 genomes AF: 0.00278 AC: 423 AN: 152180 Hom.: 2 Cov.: 33

Gnomad AFR AF: 0.00946

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000654

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000471

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000162

Gnomad OTH AF: 0.00239

GnomAD3 exomes AF: 0.000846 AC: 211 AN: 249262 Hom.: 2 AF XY: 0.000719 AC XY: 97 AN XY: 134966

Gnomad AFR exome AF: 0.00936

Gnomad AMR exome AF: 0.000492

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000555

Gnomad FIN exome AF: 0.000185

Gnomad NFE exome AF: 0.000161

Gnomad OTH exome AF: 0.000490

GnomAD4 exome AF: 0.000405 AC: 592 AN: 1461806 Hom.: 3 Cov.: 89 AF XY: 0.000393 AC XY: 286 AN XY: 727216

Gnomad4 AFR exome AF: 0.0102

Gnomad4 AMR exome AF: 0.000537

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000661

Gnomad4 FIN exome AF: 0.000225

Gnomad4 NFE exome AF: 0.0000989

Gnomad4 OTH exome AF: 0.000811

GnomAD4 genome AF: 0.00280 AC: 426 AN: 152298 Hom.: 2 Cov.: 33 AF XY: 0.00248 AC XY: 185 AN XY: 74464

Gnomad4 AFR AF: 0.00950

Gnomad4 AMR AF: 0.000653

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.000471

Gnomad4 NFE AF: 0.000162

Gnomad4 OTH AF: 0.00237

Alfa AF: 0.000640 Hom.: 2

Bravo AF: 0.00312

Asia WGS AF: 0.000866 AC: 3 AN: 3478

EpiCase AF: 0.000436

EpiControl AF: 0.000237

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:3

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 31, 2019	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Dec 01, 2023	FMN2: BP4, BP7, BS2 -
Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Mar 31, 2017

- -

FMN2-related disorder Benign:1

Benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Oct 14, 2019

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.40
CADD	Benign	8.9
DANN	Benign	0.95

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

LitVar

Other links and lift over

dbSNP: rs148480631; hg19: chr1-240255940;