rs2234889

Positions:

• chr1-171209118-CT-C
• chr1-171209118-CT-CTT
• chr1-171209118-CT-CTTT

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001460.5(FMO2):​c.1588delT​(p.Cys530fs) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000246 in 527,618 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 30)
  • Exomes 𝑓: 0.000025 (0 hom.)
• Consequence: FMO2 NM_001460.5 frameshift
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.47

Genes affected

FMO2 (HGNC:3770): (flavin containing dimethylaniline monoxygenase 2) This gene encodes a flavin-containing monooxygenase family member. It is an NADPH-dependent enzyme that catalyzes the N-oxidation of some primary alkylamines through an N-hydroxylamine intermediate. However, some human populations contain an allele (FMO2*2A) with a premature stop codon, resulting in a protein that is C-terminally-truncated, has no catalytic activity, and is likely degraded rapidly. This gene is found in a cluster with other related family members on chromosome 1. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2014]

FMO2 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FMO2	NM_001460.5	c.1588delT	p.Cys530fs	frameshift_variant	9/9	ENST00000209929.10	NP_001451.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FMO2	ENST00000209929.10	c.1588delT	p.Cys530fs	frameshift_variant	9/9	1	NM_001460.5	ENSP00000209929.8

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome AF: 0.0000246 AC: 13 AN: 527618 Hom.: 0 Cov.: 7 AF XY: 0.0000218 AC XY: 6 AN XY: 275314

Gnomad4 AFR exome AF: 0.0000735

Gnomad4 AMR exome AF: 0.0000554

Gnomad4 ASJ exome AF: 0.0000724

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000472

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000232

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 30

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

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.

Other links and lift over

hg19: chr1-171178257;