rs1555571174

Positions:

• chr16-89805329-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_000135.4(FANCA):​c.660G>C​(p.Gln220His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000342 in 1,461,806 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: FANCA NM_000135.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.639

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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.24250373).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FANCA	NM_000135.4	c.660G>C	p.Gln220His	missense_variant	7/43	ENST00000389301.8	NP_000126.2
FANCA	NM_001286167.3	c.660G>C	p.Gln220His	missense_variant	7/43		NP_001273096.1
FANCA	NM_001018112.3	c.660G>C	p.Gln220His	missense_variant	7/11		NP_001018122.1
FANCA	NM_001351830.2	c.564G>C	p.Gln188His	missense_variant	6/10		NP_001338759.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FANCA	ENST00000389301.8	c.660G>C	p.Gln220His	missense_variant	7/43	1	NM_000135.4	ENSP00000373952	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1461806 Hom.: 0 Cov.: 31 AF XY: 0.00000550 AC XY: 4 AN XY: 727204

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000580

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Fanconi anemia Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 25, 2022

This sequence change replaces glutamine, which is neutral and polar, with histidine, which is basic and polar, at codon 220 of the FANCA protein (p.Gln220His). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with FANCA-related conditions. ClinVar contains an entry for this variant (Variation ID: 456135). 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 not expected to disrupt FANCA 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.27
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.39
CADD	Benign	19
DANN	Uncertain	0.99
DEOGEN2	Benign	0.31	T;.;.;T;T;.
Eigen	Benign	-0.035
Eigen_PC	Benign	-0.23
FATHMM_MKL	Benign	0.27	N
LIST_S2	Benign	0.74	T;T;T;T;T;T
M_CAP	Benign	0.022	T
MetaRNN	Benign	0.24	T;T;T;T;T;T
MetaSVM	Benign	-0.90	T
MutationAssessor	Uncertain	2.3	M;M;M;.;.;.
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Benign	0.38	T
PROVEAN	Benign	-2.1	N;N;D;D;D;D
REVEL	Benign	0.094
Sift	Benign	0.12	T;T;D;D;D;D
Sift4G	Uncertain	0.054	T;D;D;D;D;D
Polyphen		1.0	D;.;D;.;D;D
Vest4		0.39
MutPred		0.35		Gain of catalytic residue at Q220 (P = 0.1025);Gain of catalytic residue at Q220 (P = 0.1025);Gain of catalytic residue at Q220 (P = 0.1025);Gain of catalytic residue at Q220 (P = 0.1025);Gain of catalytic residue at Q220 (P = 0.1025);.;
MVP		0.69
ClinPred		0.23	T
GERP RS		1.8
RBP_binding_hub_radar		0.92
RBP_regulation_power_radar		2.6
Varity_R		0.097
gMVP		0.28

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

LitVar

Other links and lift over

dbSNP: rs1555571174; hg19: chr16-89871737;