chr12-4370563-C-G

Variant names:

• chr12-4370563-C-G
• rs193922702
• NM_020638.3:c.536G>C

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM1 PM2 PM5 PP2 PP3

The NM_020638.3(FGF23):​c.536G>C​(p.Arg179Pro) 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R179Q) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 31)
• Consequence: FGF23 NM_020638.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.10
• Publications: 0 publications found

Genes affected

FGF23 (HGNC:3680): (fibroblast growth factor 23) This gene encodes a member of the fibroblast growth factor family of proteins, which possess broad mitogenic and cell survival activities and are involved in a variety of biological processes. The product of this gene regulates phosphate homeostasis and transport in the kidney. The full-length, functional protein may be deactivated via cleavage into N-terminal and C-terminal chains. Mutation of this cleavage site causes autosomal dominant hypophosphatemic rickets (ADHR). Mutations in this gene are also associated with hyperphosphatemic familial tumoral calcinosis (HFTC). [provided by RefSeq, Feb 2013]

FGF23 Gene-Disease associations (from GenCC):

• autosomal dominant hypophosphatemic rickets

  Inheritance: AD Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, Ambry Genetics
• tumoral calcinosis, hyperphosphatemic, familial, 2

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• tumoral calcinosis, hyperphosphatemic, familial, 1

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000285901 (HGNC:):

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 3 benign, 7 uncertain in NM_020638.3
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr12-4370563-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 36135.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 10 curated pathogenic missense variants (we use a threshold of 10). The gene has 2 curated benign missense variants. Gene score misZ: 0.39751 (below the threshold of 3.09). Trascript score misZ: 0.82334 (below the threshold of 3.09). GenCC associations: The gene is linked to autosomal dominant hypophosphatemic rickets, tumoral calcinosis, hyperphosphatemic, familial, 2, tumoral calcinosis, hyperphosphatemic, familial, 1.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.776

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_020638.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FGF23	NM_020638.3	MANE Select	c.536G>C	p.Arg179Pro	missense	Exon 3 of 3	NP_065689.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FGF23	ENST00000237837.2	TSL:1 MANE Select	c.536G>C	p.Arg179Pro	missense	Exon 3 of 3	ENSP00000237837.1
	ENSG00000285901	ENST00000674624.1		n.*1204+4281C>G		intron	N/A	ENSP00000501898.1
	ENSG00000285901	ENST00000648100.1		n.*1967+4281C>G		intron	N/A	ENSP00000497536.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.64
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Uncertain	0.040
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.55	D
Eigen	Uncertain	0.40
Eigen_PC	Uncertain	0.37
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.83	T
M_CAP	Uncertain	0.20	D
MetaRNN	Pathogenic	0.78	D
MetaSVM	Uncertain	0.43	D
MutationAssessor	Uncertain	2.3	M
PhyloP100		5.1
PrimateAI	Uncertain	0.65	T
PROVEAN	Benign	-1.2	N
REVEL	Uncertain	0.56
Sift	Uncertain	0.019	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.61
MutPred		0.35		Gain of loop (P = 0.024)
MVP		0.91
MPC		1.2
ClinPred		0.96	D
GERP RS		4.9
Varity_R		0.90
gMVP		0.55
Mutation Taster		=32/68	disease causing

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

Other links and lift over

dbSNP: rs193922702; hg19: chr12-4479729;