rs1556008316

Positions:

• chrX-139560773-T-G

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM1 PM2 PM5 PP3_Strong PP5

The NM_000133.4(F9):​c.756T>G​(p.Cys252Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. 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 (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C252Y) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 23)
• Consequence: F9 NM_000133.4 missense
• Clinical Significance: Likely pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 1.56

Genes affected

F9 (HGNC:3551): (coagulation factor IX) This gene encodes vitamin K-dependent coagulation factor IX that circulates in the blood as an inactive zymogen. This factor is converted to an active form by factor XIa, which excises the activation peptide and thus generates a heavy chain and a light chain held together by one or more disulfide bonds. The role of this activated factor IX in the blood coagulation cascade is to activate factor X to its active form through interactions with Ca+2 ions, membrane phospholipids, and factor VIII. Alterations of this gene, including point mutations, insertions and deletions, cause factor IX deficiency, which is a recessive X-linked disorder, also called hemophilia B or Christmas disease. Alternative splicing results in multiple transcript variants encoding different isoforms that may undergo similar proteolytic processing. [provided by RefSeq, Sep 2015]

ACMG classification

Verdict is Pathogenic. Variant got 11 ACMG points.

• PM1: In a domain Peptidase S1 (size 232) in uniprot entity FA9_HUMAN there are 51 pathogenic changes around while only 0 benign (100%) in NM_000133.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chrnull-null-null-null is described in UniProt as null.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.996
• PP5: Variant X-139560773-T-G is Pathogenic according to our data. Variant chrX-139560773-T-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 375453.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
F9	NM_000133.4	c.756T>G	p.Cys252Trp	missense_variant	7/8	ENST00000218099.7	NP_000124.1
F9	NM_001313913.2	c.642T>G	p.Cys214Trp	missense_variant	6/7		NP_001300842.1
F9	XM_005262397.5	c.627T>G	p.Cys209Trp	missense_variant	6/7		XP_005262454.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
F9	ENST00000218099.7	c.756T>G	p.Cys252Trp	missense_variant	7/8	1	NM_000133.4	ENSP00000218099	P1
F9	ENST00000394090.2	c.642T>G	p.Cys214Trp	missense_variant	6/7	1		ENSP00000377650
F9	ENST00000643157.1	n.1423T>G		non_coding_transcript_exon_variant	5/7

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 23

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Hereditary factor IX deficiency disease Pathogenic:1

Likely pathogenic, no assertion criteria provided

research

Institute of Basic Medical Sciences, Khyber Medical University, Peshawar

Dec 17, 2016

The variant is associated with Moderate Haemophilia B or Factor IX deficiency -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.67	D
BayesDel_noAF	Pathogenic	0.73
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.97	D;.
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.82	T;T
M_CAP	Pathogenic	0.95	D
MetaRNN	Pathogenic	1.0	D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	4.5	H;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.60	T
PROVEAN	Pathogenic	-11	D;D
REVEL	Pathogenic	0.88
Sift	Uncertain	0.0010	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	D;.
Vest4		0.95
MutPred		0.97		Gain of MoRF binding (P = 0.1019);.;
MVP		1.0
MPC		1.9
ClinPred		1.0	D
GERP RS		3.5
Varity_R		0.99
gMVP		1.0

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs1556008316; hg19: chrX-138642932;