rs1555545588

Variant names:

• chr16-89765066-A-C
• rs1555545588
• NM_000135.4:c.2602T>G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_000135.4(FANCA):​c.2602T>G​(p.Phe868Val) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000547 in 1,461,728 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000055 (0 hom.)
• Consequence: FANCA NM_000135.4 missense, splice_region
• Scores: Splicing: ADA: 0.02071
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts P:1 U:2
• Conservation: PhyloP100: 1.06

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.31937027).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FANCA	NM_000135.4	c.2602T>G	p.Phe868Val	missense_variant, splice_region_variant	Exon 28 of 43	ENST00000389301.8	NP_000126.2
FANCA	NM_001286167.3	c.2602T>G	p.Phe868Val	missense_variant, splice_region_variant	Exon 28 of 43		NP_001273096.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FANCA	ENST00000389301.8	c.2602T>G	p.Phe868Val	missense_variant, splice_region_variant	Exon 28 of 43	1	NM_000135.4	ENSP00000373952.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000547 AC: 8 AN: 1461728 Hom.: 0 Cov.: 32 AF XY: 0.00000413 AC XY: 3 AN XY: 727150

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000630

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1 Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Fanconi anemia complementation group A Pathogenic:1 Uncertain:1

Feb 28, 2020

Leiden Open Variation Database

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: curation

Curator: Arleen D. Auerbach. Submitter to LOVD: Arleen D. Auerbach. -

Sep 26, 2017

Counsyl

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Fanconi anemia Uncertain:1

Jan 25, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces phenylalanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 868 of the FANCA protein (p.Phe868Val). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individuals with Fanconi anemia (PMID: 15523645, 28102861). ClinVar contains an entry for this variant (Variation ID: 554084). 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 valine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. Experimental studies are conflicting or provide insufficient evidence to determine the effect of this variant on FANCA function (PMID: 15523645, 28215707). 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.50
BayesDel_addAF	Uncertain	0.052	T
BayesDel_noAF	Benign	-0.16
CADD	Benign	21
DANN	Uncertain	0.98
DEOGEN2	Benign	0.22	T;.
Eigen	Benign	-0.19
Eigen_PC	Benign	-0.087
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Benign	0.65	T;T
M_CAP	Benign	0.036	D
MetaRNN	Benign	0.32	T;T
MetaSVM	Benign	-0.49	T
MutationAssessor	Benign	2.0	M;M
PrimateAI	Uncertain	0.51	T
PROVEAN	Uncertain	-2.5	N;N
REVEL	Benign	0.28
Sift	Benign	0.15	T;T
Sift4G	Benign	0.24	T;T
Polyphen		0.13	B;.
Vest4		0.54
MutPred		0.25		Gain of catalytic residue at F868 (P = 0.0627);Gain of catalytic residue at F868 (P = 0.0627);
MVP		0.97
ClinPred		0.42	T
GERP RS		2.8
Varity_R		0.10
gMVP		0.31

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.021
dbscSNV1_RF	Benign	0.31
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: rs1555545588; hg19: chr16-89831474;