rs1554828492

Positions:

• chr9-95107269-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM2 PM5 BP4

The NM_000136.3(FANCC):​c.1330G>A​(p.Val444Ile) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/23 in silico tools predict a benign outcome for this variant. 2/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V444F) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: FANCC NM_000136.3 missense, splice_region
• Scores: Splicing: ADA: 0.8511
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 1.55

Genes affected

FANCC (HGNC:3584): (FA complementation group C) 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 C. [provided by RefSeq, Jul 2008]

LOC107987102 (HGNC:):

AOPEP (HGNC:1361): (aminopeptidase O (putative)) This gene encodes a member of the M1 zinc aminopeptidase family. The encoded protein is a zinc-dependent metallopeptidase that catalyzes the removal of an amino acid from the amino terminus of a protein or peptide. This protein may play a role in the generation of angiotensin IV. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Oct 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr9-95107268-A-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 2445319.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP4: Computational evidence support a benign effect (MetaRNN=0.28679127).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FANCC	NM_000136.3	c.1330G>A	p.Val444Ile	missense_variant, splice_region_variant	14/15	ENST00000289081.8
LOC107987102	XR_001746847.2	n.687C>T		non_coding_transcript_exon_variant	2/2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FANCC	ENST00000289081.8	c.1330G>A	p.Val444Ile	missense_variant, splice_region_variant	14/15	1	NM_000136.3	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Fanconi anemia Uncertain:2

Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Jan 11, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 16, 2017	This sequence change replaces valine with isoleucine at codon 444 of the FANCC protein (p.Val444Ile). The valine residue is highly conserved and there is a small physicochemical difference between valine and isoleucine. It also falls at the first nucleotide of exon 14 of the FANCC coding sequence. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a FANCC-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may alter RNA splicing, but this prediction has not been confirmed by published transcriptional studies. In summary, this variant is a novel missense change with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance. -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 31, 2023

The c.1330G>A (p.V444I) alteration is located in exon 14 (coding exon 13) of the FANCC gene. This alteration results from a G to A substitution at nucleotide position 1330, causing the valine (V) at amino acid position 444 to be replaced by an isoleucine (I). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Benign	-0.19	T
BayesDel_noAF	Benign	-0.52
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Benign	0.32	T;T
Eigen	Benign	-0.32
Eigen_PC	Benign	-0.28
FATHMM_MKL	Benign	0.74	D
LIST_S2	Benign	0.49	.;T
M_CAP	Benign	0.028	D
MetaRNN	Benign	0.29	T;T
MetaSVM	Benign	-0.81	T
MutationAssessor	Uncertain	2.2	M;M
MutationTaster	Benign	0.60	D;D
PrimateAI	Benign	0.29	T
PROVEAN	Benign	-0.64	N;N
REVEL	Benign	0.071
Sift	Benign	0.094	T;T
Sift4G	Benign	0.17	T;T
Polyphen		0.16	B;B
Vest4		0.14
MutPred		0.70		Gain of catalytic residue at Q445 (P = 0.0645);Gain of catalytic residue at Q445 (P = 0.0645);
MVP		0.63
MPC		0.15
ClinPred		0.77	D
GERP RS		3.8
Varity_R		0.060
gMVP		0.14

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.85
dbscSNV1_RF	Pathogenic	0.72
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

Other links and lift over

dbSNP: rs1554828492; hg19: chr9-97869551;