rs879254329

Positions:

• chrX-14865276-A-G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Moderate PP5_Moderate

The NM_001018113.3(FANCB):​c.235T>C​(p.Cys79Arg) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: FANCB NM_001018113.3 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 5.78

Genes affected

FANCB (HGNC:3583): (FA complementation group B) This gene encodes a member of the Fanconi anemia complementation group B. This protein is assembled into a nucleoprotein complex that is involved in the repair of DNA lesions. Mutations in this gene can cause chromosome instability and VACTERL syndrome with hydrocephalus. [provided by RefSeq, Apr 2016]

FANCB (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.886
• PP5: Variant X-14865276-A-G is Pathogenic according to our data. Variant chrX-14865276-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 246614.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FANCB	NM_001018113.3	c.235T>C	p.Cys79Arg	missense_variant	3/10	ENST00000650831.1	NP_001018123.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FANCB	ENST00000650831.1	c.235T>C	p.Cys79Arg	missense_variant	3/10		NM_001018113.3	ENSP00000498215.1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 27

GnomAD4 genome Cov.: 23

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Fanconi anemia Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 24, 2016

This variant is not present in population databases (ExAC no frequency). This sequence change replaces cysteine with arginine at codon 79 of the FANCB protein (p.Cys79Arg). The cysteine residue is highly conserved and there is a large physicochemical difference between cysteine and arginine. 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: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). In summary, this is a novel missense change that has been observed in an individual with Fanconi anemia. However, without additional functional and/or genetic data, this variant has been classified as Likely Pathogenic. This variant has not been reported in the literature in individuals with a FANCB-related disease. However, this variant has been shown to arise de novo in an individual affected with Fanconi anemia (Invitae database). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.61
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.10
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.65	D;D;T
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.68	T;.;T
M_CAP	Pathogenic	0.36	D
MetaRNN	Pathogenic	0.89	D;D;D
MetaSVM	Benign	-1.2	T
MutationAssessor	Uncertain	2.9	M;M;.
PrimateAI	Uncertain	0.61	T
PROVEAN	Pathogenic	-9.0	D;D;D
REVEL	Uncertain	0.43
Sift	Uncertain	0.0030	D;D;D
Sift4G	Pathogenic	0.0	D;D;D
Polyphen		1.0	D;D;.
Vest4		0.87
MutPred		0.69		Loss of sheet (P = 0.0357);Loss of sheet (P = 0.0357);Loss of sheet (P = 0.0357);
MVP		0.78
MPC		0.68
ClinPred		1.0	D
GERP RS		5.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.95

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: rs879254329; hg19: chrX-14883398;