rs933284199

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_001113378.2(FANCI):c.2507A>G(p.Asn836Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000171 in 1,552,232 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N836I) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000059 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00018 ( 0 hom. )

Consequence

FANCI
NM_001113378.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5B:1

Conservation

PhyloP100: -0.944

Variant links:

Genes affected

FANCI (HGNC:25568): (FA complementation group I) The Fanconi anemia complementation group (FANC) currently includes FANCA, FANCB, FANCC, FANCD1 (also called BRCA2), FANCD2, FANCE, FANCF, FANCG, FANCI, FANCJ (also called BRIP1), FANCL, FANCM and FANCN (also called PALB2). The previously defined group FANCH is the same as FANCA. Fanconi anemia is a genetically heterogeneous recessive disorder characterized by cytogenetic instability, hypersensitivity to DNA crosslinking agents, increased chromosomal breakage, and defective DNA repair. The members of the Fanconi anemia complementation group do not share sequence similarity; they are related by their assembly into a common nuclear protein complex. This gene encodes the protein for complementation group I. Alternative splicing results in two transcript variants encoding different isoforms. [provided by RefSeq, Jul 2008]

FANCI links:

Genome browser will be placed here

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=0.010942578).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FANCI	NM_001113378.2 linkuse as main transcript	c.2507A>G	p.Asn836Ser	missense_variant	24/38	ENST00000310775.12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FANCI	ENST00000310775.12 linkuse as main transcript	c.2507A>G	p.Asn836Ser	missense_variant	24/38	1	NM_001113378.2	P1	Q9NVI1-3

Frequencies

GnomAD3 genomes

AF:

0.0000591

AC:

AN:

152172

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000882

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000629

AC:

AN:

158928

Hom.:

AF XY:

0.0000358

AC XY:

AN XY:

83710

show subpopulations

Gnomad AFR exome

AF:

0.000120

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000439

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000129

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000184

AC:

257

AN:

1400060

Hom.:

Cov.:

AF XY:

0.000168

AC XY:

116

AN XY:

690494

show subpopulations

Gnomad4 AFR exome

AF:

0.0000633

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000280

Gnomad4 SAS exome

AF:

0.0000379

Gnomad4 FIN exome

AF:

0.0000202

Gnomad4 NFE exome

AF:

0.000226

Gnomad4 OTH exome

AF:

0.0000859

GnomAD4 genome

AF:

0.0000591

AC:

AN:

152172

Hom.:

Cov.:

AF XY:

0.0000673

AC XY:

AN XY:

74346

show subpopulations

Gnomad4 AFR

AF:

0.0000483

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.000288

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000882

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000559

Hom.:

Bravo

AF:

0.0000378

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:5Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Fanconi anemia

Uncertain:2

Uncertain significance, criteria provided, single submitter	curation	Sema4, Sema4	Jan 06, 2022	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Jan 25, 2024	This sequence change replaces asparagine, which is neutral and polar, with serine, which is neutral and polar, at codon 836 of the FANCI protein (p.Asn836Ser). This variant is present in population databases (no rsID available, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with FANCI-related conditions. ClinVar contains an entry for this variant (Variation ID: 408253). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Benign"; Align-GVGD: "Not Available". The serine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Apr 16, 2021

This sequence change does not appear to have been previously described in patients with FANCI-related disorders and has been described in the gnomAD database with a low population frequency of 0.0068% (dbSNP rs933284199). The p.Asn836Ser change affects a poorly conserved amino acid residue located in a domain of the FANCI protein that is not known to be functional. The p.Asn836Ser substitution appears to be benign using several in-silico pathogenicity prediction tools (SIFT, PolyPhen2, Align GVGD, REVEL). Based on in silico splice prediction programs, this sequence change likely affects normal splicing of the FANCI gene, however functional studies have not been performed to prove this conclusively. Due to these contrasting evidences and the lack of functional studies, the clinical significance of the p.Asn836Ser change remains unknown at this time. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Institute for Clinical Genetics, University Hospital TU Dresden, University Hospital TU Dresden

Nov 03, 2021

- -

Fanconi anemia complementation group I

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Inborn genetic diseases

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 03, 2022

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.051

BayesDel_addAF

Benign

-0.43

BayesDel_noAF

Benign

-0.62

Cadd

Benign

0.011

Dann

Benign

0.48

DEOGEN2

Benign

0.040

Eigen

Benign

-1.7

Eigen_PC

Benign

-1.6

FATHMM_MKL

Benign

0.044

LIST_S2

Benign

0.79

M_CAP

Benign

0.0091

MetaRNN

Benign

0.011

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.2

MutationTaster

Benign

1.0

N;N

PrimateAI

Benign

0.20

PROVEAN

Benign

-0.15

REVEL

Benign

0.058

Sift

Benign

0.75

Sift4G

Benign

0.95

Polyphen

0.0040

Vest4

0.080

MutPred

0.29

Gain of phosphorylation at N836 (P = 0.043);

MVP

0.29

MPC

0.015

ClinPred

0.0096

GERP RS

-2.5

Varity_R

0.028

gMVP

0.068

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over