rs148473140

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM2PM5PP3_StrongPP5_Very_Strong

The NM_000135.4(FANCA):c.1303C>T(p.Arg435Cys) variant causes a missense change. The variant allele was found at a frequency of 0.00000434 in 1,613,876 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R435L) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

FANCA
NM_000135.4 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:7

Conservation

PhyloP100: 5.84

Variant links:

Genes affected

FANCA (HGNC:3582): (FA complementation group A) 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 A. Alternative splicing results in multiple transcript variants encoding different isoforms. Mutations in this gene are the most common cause of Fanconi anemia. [provided by RefSeq, Jul 2008]

FANCA links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 16 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr16-89791458-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 408183.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.962

PP5

Variant 16-89791459-G-A is Pathogenic according to our data. Variant chr16-89791459-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 555603.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr16-89791459-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FANCA	NM_000135.4 linkuse as main transcript	c.1303C>T	p.Arg435Cys	missense_variant	14/43	ENST00000389301.8
FANCA	NM_001286167.3 linkuse as main transcript	c.1303C>T	p.Arg435Cys	missense_variant	14/43

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FANCA	ENST00000389301.8 linkuse as main transcript	c.1303C>T	p.Arg435Cys	missense_variant	14/43	1	NM_000135.4	P1	O15360-1

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152142

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000797

AC:

AN:

250930

Hom.:

AF XY:

0.00000737

AC XY:

AN XY:

135680

show subpopulations

Gnomad AFR exome

AF:

0.0000617

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000881

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000274

AC:

AN:

1461734

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727164

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000180

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152142

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74324

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.0000655

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000948

Hom.:

Bravo

AF:

0.0000151

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000247

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Fanconi anemia

Pathogenic:3

Pathogenic, no assertion criteria provided	clinical testing	Natera, Inc.	Jul 06, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Dec 14, 2021	Variant summary: FANCA c.1303C>T (p.Arg435Cys) results in a non-conservative amino acid change located in the Fanconi anaemia group A protein, N-terminal domain (IPR031729) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 8e-06 in 250930 control chromosomes. c.1303C>T has been reported in the literature as a homozygous and compound heterozygous genotype in multiple individuals affected with Fanconi Anemia (example, Adachi_2002, Tachibana_1999, Yagasaki_2004, Muramatsu_2017). These data indicate that the variant is very likely to be associated with disease. At least two publications report experimental evidence evaluating an impact on protein function (example, Adachi_2002, Yagasaki_2001). The most pronounced variant effect results in a failure to correct sensitivity to mitomycin C induced DNA damage, defective for in-vivo phosphorylation and failure to induce monoubiquitination of FANCD2. Two clinical diagnostic laboratories and the LOVD database have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All submitters classified the variant as pathogenic (n=2)/likely pathogenic (n=1). Based on the evidence outlined above, the variant was classified as pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Nov 06, 2023	This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 435 of the FANCA protein (p.Arg435Cys). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This missense change has been observed in individuals with Fanconi anemia (PMID: 10090479, 15523645, 28102861). ClinVar contains an entry for this variant (Variation ID: 555603). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt FANCA protein function with a positive predictive value of 80%. Experimental studies have shown that this missense change affects FANCA function (PMID: 11739169, 12444097). This variant disrupts the p.Arg435 amino acid residue in FANCA. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 19367192; Invitae). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

Fanconi anemia complementation group A

Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Jan 15, 2022	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Dec 14, 2017	- -
Pathogenic, no assertion criteria provided	curation	Leiden Open Variation Database	Feb 28, 2020	Curator: Arleen D. Auerbach. Submitter to LOVD: Arleen D. Auerbach. -

not provided

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Quest Diagnostics Nichols Institute San Juan Capistrano

May 22, 2023

The FANCA c.1303C>T (p.Arg435Cys) variant has been reported in the published literature in individuals with Fanconi anemia (PMID: 10090479 (1999), 12444097 (2002), 15523645 (2004), 26799702 (2016), 28102861 (2017)). Published functional studies show that this variant disrupts the protein function (PMID: 11739169 (2001), 12444097 (2002)). The frequency of this variant in the general population, 0.000011 (3/282316 chromosomes (Genome Aggregation Database, http://gnomad.broadinstitute.org)), is uninformative in the assessment of its pathogenicity. Analysis of this variant using bioinformatics tools for the prediction of the effect of amino acid changes on protein structure and function yielded predictions that this variant is damaging. Additional analysis using software algorithms for the prediction of the effect of nucleotide changes on splicing yielded predictions that this variant does not affect FANCA mRNA splicing. Based on the available information, this variant is classified as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.76

BayesDel_addAF

Pathogenic

0.54

BayesDel_noAF

Pathogenic

0.54

Cadd

Pathogenic

Dann

Pathogenic

1.0

DEOGEN2

Uncertain

0.73

D;.

Eigen

Uncertain

0.66

Eigen_PC

Uncertain

0.60

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.96

D;D

M_CAP

Pathogenic

0.68

MetaRNN

Pathogenic

0.96

D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Uncertain

2.7

M;M

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.62

PROVEAN

Pathogenic

-6.7

D;D

REVEL

Pathogenic

0.87

Sift

Pathogenic

0.0

D;D

Sift4G

Pathogenic

0.0

D;D

Polyphen

1.0

D;.

Vest4

0.94

MVP

0.99

ClinPred

0.99

GERP RS

4.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.42

gMVP

0.82

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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