rs727505369

Positions:

• chr8-38424624-T-C

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP2 PP3_Moderate PP5

The NM_023110.3(FGFR1):​c.821A>G​(p.Glu274Gly) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,710 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E274Q) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: FGFR1 NM_023110.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3 U:1
• Conservation: PhyloP100: 6.17

Genes affected

FGFR1 (HGNC:3688): (fibroblast growth factor receptor 1) The protein encoded by this gene is a member of the fibroblast growth factor receptor (FGFR) family, where amino acid sequence is highly conserved between members and throughout evolution. FGFR family members differ from one another in their ligand affinities and tissue distribution. A full-length representative protein consists of an extracellular region, composed of three immunoglobulin-like domains, a single hydrophobic membrane-spanning segment and a cytoplasmic tyrosine kinase domain. The extracellular portion of the protein interacts with fibroblast growth factors, setting in motion a cascade of downstream signals, ultimately influencing mitogenesis and differentiation. This particular family member binds both acidic and basic fibroblast growth factors and is involved in limb induction. Mutations in this gene have been associated with Pfeiffer syndrome, Jackson-Weiss syndrome, Antley-Bixler syndrome, osteoglophonic dysplasia, and autosomal dominant Kallmann syndrome 2. Chromosomal aberrations involving this gene are associated with stem cell myeloproliferative disorder and stem cell leukemia lymphoma syndrome. Alternatively spliced variants which encode different protein isoforms have been described; however, not all variants have been fully characterized. [provided by RefSeq, Jul 2008]

(HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 uncertain in NM_023110.3
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, FGFR1
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.869
• PP5: Variant 8-38424624-T-C is Pathogenic according to our data. Variant chr8-38424624-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 180152.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=3, Uncertain_significance=1}. Variant chr8-38424624-T-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FGFR1	NM_023110.3	c.821A>G	p.Glu274Gly	missense_variant	7/18	ENST00000447712.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FGFR1	ENST00000447712.7	c.821A>G	p.Glu274Gly	missense_variant	7/18	1	NM_023110.3	P4
	ENST00000528407.1	n.388-1326T>C		intron_variant, non_coding_transcript_variant		4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461710 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727122

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:3 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Hypogonadotropic hypogonadism 7 with or without anosmia Pathogenic:1

Likely pathogenic, criteria provided, single submitter

case-control

Chan Lab, Boston Children's Hospital

Nov 01, 2014

- -

Delayed puberty Pathogenic:1

Likely pathogenic, criteria provided, single submitter

case-control

Chan Lab, Boston Children's Hospital

Nov 01, 2014

- -

Pfeiffer syndrome;C0406612:Encephalocraniocutaneous lipomatosis;C0432122:Trigonocephaly 1;C0432283:Osteoglophonic dysplasia;C0795998:Jackson-Weiss syndrome;C1563720:Hypogonadotropic hypogonadism 2 with or without anosmia;C1845146:Hartsfield-Bixler-Demyer syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Jul 18, 2021

- -

Hypogonadotropic hypogonadism 2 with or without anosmia Uncertain:1

Uncertain significance, criteria provided, single submitter

research

Reproductive Endocrine Unit, Massachusetts General Hospital

May 04, 2023

The variant has been classified as VUS based on the variant meeting the following ACMG Criteria: PM2,PP3. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.64
BayesDel_addAF	Pathogenic	0.38	D
BayesDel_noAF	Pathogenic	0.31
CADD	Pathogenic	32
DANN	Uncertain	1.0
Eigen	Uncertain	0.63
Eigen_PC	Pathogenic	0.68
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.89	D;.;D;D;D;D;.;D;D;D;D;D;D;D
M_CAP	Uncertain	0.17	D
MetaRNN	Pathogenic	0.87	D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.27	D
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.74	T
PROVEAN	Pathogenic	-5.5	D;D;D;.;D;D;D;D;D;D;D;D;D;D
REVEL	Uncertain	0.58
Sift	Uncertain	0.0010	D;D;D;.;D;D;D;D;D;D;D;D;D;D
Sift4G	Benign	0.10	T;T;T;D;D;T;T;T;T;T;T;T;.;.
Polyphen		0.85	P;P;P;D;.;P;P;P;P;P;.;P;.;.
Vest4		0.83
MutPred		0.68		.;.;Gain of catalytic residue at M276 (P = 0.0637);.;.;Gain of catalytic residue at M276 (P = 0.0637);.;.;.;.;.;.;.;Gain of catalytic residue at M276 (P = 0.0637);
MVP		0.96
MPC		2.4
ClinPred		0.99	D
GERP RS		6.1
Varity_R		0.95
gMVP		0.91

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: rs727505369; hg19: chr8-38282142;