rs1556435940

Variant names:

• chrX-139537069-G-A
• rs1556435940
• NM_000133.4:c.148G>A

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1 PM2 PP3 PP5_Moderate

The NM_000133.4(F9):​c.148G>A​(p.Gly50Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00000365 in 1,096,855 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 1 hemizygotes in GnomAD. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 0.0000036 (0 hom. 1 hem.)
• Consequence: F9 NM_000133.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 3.95

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 Likely_pathogenic. Variant got 7 ACMG points.

• PM1: In a domain Gla (size 45) in uniprot entity FA9_HUMAN there are 14 pathogenic changes around while only 0 benign (100%) in NM_000133.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.771
• PP5: Variant X-139537069-G-A is Pathogenic according to our data. Variant chrX-139537069-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 454495.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
F9	NM_000133.4	c.148G>A	p.Gly50Ser	missense_variant	Exon 2 of 8	ENST00000218099.7	NP_000124.1
F9	NM_001313913.2	c.148G>A	p.Gly50Ser	missense_variant	Exon 2 of 7		NP_001300842.1
F9	XM_005262397.5	c.148G>A	p.Gly50Ser	missense_variant	Exon 2 of 7		XP_005262454.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
F9	ENST00000218099.7	c.148G>A	p.Gly50Ser	missense_variant	Exon 2 of 8	1	NM_000133.4	ENSP00000218099.2
F9	ENST00000394090.2	c.148G>A	p.Gly50Ser	missense_variant	Exon 2 of 7	1		ENSP00000377650.2
F9	ENST00000479617.2	n.155G>A		non_coding_transcript_exon_variant	Exon 2 of 4	5

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome AF: 0.00000365 AC: 4 AN: 1096855 Hom.: 0 Cov.: 30 AF XY: 0.00000276 AC XY: 1 AN XY: 362397

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000332

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000357

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 23

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary factor IX deficiency disease;C2749016:Thrombophilia, X-linked, due to factor 9 defect Pathogenic:1

Sep 13, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 50 of the F9 protein (p.Gly50Ser). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individuals with mild hemophilia B (PMID: 8091381, 8594556, 19699296, 27213901; Invitae). ClinVar contains an entry for this variant (Variation ID: 454495). 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 expected to disrupt F9 protein function. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Pathogenic	0.60	D
BayesDel_noAF	Pathogenic	0.63
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.47	T;.
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Benign	0.85	T;T
M_CAP	Pathogenic	0.95	D
MetaRNN	Pathogenic	0.77	D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Uncertain	2.5	M;M
PrimateAI	Benign	0.42	T
PROVEAN	Benign	-1.7	N;N
REVEL	Pathogenic	0.82
Sift	Benign	0.26	T;T
Sift4G	Benign	0.65	T;T
Polyphen		0.99	D;.
Vest4		0.44
MutPred		0.74		Gain of disorder (P = 0.0909);Gain of disorder (P = 0.0909);
MVP		1.0
MPC		0.38
ClinPred		0.97	D
GERP RS		4.3
Varity_R		0.48
gMVP		0.91

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: rs1556435940; hg19: chrX-138619228;