Genetic Variant FGFR1:p.Ile300Thr (chr8-38424546-A-G) – ACMG Classification: Likely_benign (-6 pts)

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 3P and 9B. PM1PP2BP4_StrongBP6BS1

The NM_001174067.2(FGFR1):c.992T>C(p.Ile331Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000531 in 1,614,184 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00039 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00055 ( 0 hom. )

Consequence

FGFR1
NM_001174067.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:6B:7

Conservation

PhyloP100: 0.639

Publications

24 publications found

Variant links:

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]

FGFR1 Gene-Disease associations (from GenCC):

encephalocraniocutaneous lipomatosis
Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
Hartsfield-Bixler-Demyer syndrome
Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics, G2P, ClinGen
hypogonadotropic hypogonadism 2 with or without anosmia
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
osteoglophonic dysplasia
Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE, LIMITED Submitted by: Orphanet, ClinGen, Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
Pfeiffer syndrome
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, G2P, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
Pfeiffer syndrome type 1
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
Jackson-Weiss syndrome
Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
hypogonadotropic hypogonadism
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
isolated trigonocephaly
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Kallmann syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
septooptic dysplasia
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
tooth agenesis
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
holoprosencephaly
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

FGFR1 links:

ENSG00000255201 (HGNC:):

ENSG00000255201 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -6 ACMG points.

PM1

In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 3 uncertain in NM_001174067.2

PP2

Missense variant in the FGFR1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 93 curated pathogenic missense variants (we use a threshold of 10). The gene has 28 curated benign missense variants. Gene score misZ: 2.4852 (below the threshold of 3.09). Trascript score misZ: 4.1989 (above the threshold of 3.09). GenCC associations: The gene is linked to Hartsfield-Bixler-Demyer syndrome, Pfeiffer syndrome type 1, encephalocraniocutaneous lipomatosis, hypogonadotropic hypogonadism 2 with or without anosmia, osteoglophonic dysplasia, isolated trigonocephaly, septooptic dysplasia, Pfeiffer syndrome, tooth agenesis, hypogonadotropic hypogonadism, Kallmann syndrome, holoprosencephaly, Jackson-Weiss syndrome.

BP4

Computational evidence support a benign effect (MetaRNN=0.06156683).

BP6

Variant 8-38424546-A-G is Benign according to our data. Variant chr8-38424546-A-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 16289.

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.000387 (59/152290) while in subpopulation NFE AF = 0.000794 (54/68032). AF 95% confidence interval is 0.000625. There are 0 homozygotes in GnomAd4. There are 25 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001174067.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
FGFR1	NM_023110.3	MANE Select	c.899T>C	p.Ile300Thr	missense	Exon 7 of 18	NP_075598.2
FGFR1	NM_001174067.2		c.992T>C	p.Ile331Thr	missense	Exon 8 of 19	NP_001167538.1
FGFR1	NM_001354367.2		c.893T>C	p.Ile298Thr	missense	Exon 7 of 18	NP_001341296.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
FGFR1	ENST00000447712.7	TSL:1 MANE Select	c.899T>C	p.Ile300Thr	missense	Exon 7 of 18	ENSP00000400162.2
FGFR1	ENST00000425967.8	TSL:1	c.893T>C	p.Ile298Thr	missense	Exon 7 of 18	ENSP00000393312.4
FGFR1	ENST00000397091.9	TSL:1	c.893T>C	p.Ile298Thr	missense	Exon 7 of 18	ENSP00000380280.5

Frequencies

GnomAD3 genomes

AF:

0.000388

AC:

AN:

152172

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000965

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000794

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000292

AC:

AN:

249600

AF XY:

0.000303

show subpopulations

Gnomad AFR exome

AF:

0.0000645

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000556

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000600

Gnomad OTH exome

AF:

0.000495

GnomAD4 exome

AF:

0.000546

AC:

798

AN:

1461894

Hom.:

Cov.:

AF XY:

0.000513

AC XY:

373

AN XY:

727248

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33480

American (AMR)

AF:

0.0000224

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.000683

AC:

760

AN:

1112012

Other (OTH)

AF:

0.000563

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.465

Heterozygous variant carriers

141

188

235

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

112

140

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000387

AC:

AN:

152290

Hom.:

Cov.:

AF XY:

0.000336

AC XY:

AN XY:

74460

show subpopulations

African (AFR)

AF:

0.0000963

AC:

AN:

41554

American (AMR)

AF:

0.0000654

AC:

AN:

15290

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10610

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000794

AC:

AN:

68032

Other (OTH)

AF:

0.00

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.514

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000577

Hom.:

Bravo

AF:

0.000325

TwinsUK

AF:

0.000809

AC:

ALSPAC

AF:

0.00156

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000584

AC:

ExAC

AF:

0.000346

AC:

EpiCase

AF:

0.000491

EpiControl

AF:

0.000830

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (7)

not specified (3)

FGFR1-related disorder (1)

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 (1)

Pfeiffer syndrome;C1563720:Hypogonadotropic hypogonadism 2 with or without anosmia (1)

Trigonocephaly 1 (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.066

BayesDel_addAF

Benign

-0.085

BayesDel_noAF

Uncertain

0.080

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.55

Eigen

Benign

-0.14

Eigen_PC

Benign

-0.030

FATHMM_MKL

Benign

0.39

LIST_S2

Benign

0.68

M_CAP

Benign

0.022

MetaRNN

Benign

0.062

MetaSVM

Benign

-0.37

MutationAssessor

Benign

1.8

PhyloP100

0.64

PrimateAI

Uncertain

0.75

PROVEAN

Benign

-1.4

REVEL

Uncertain

0.32

Sift

Benign

0.071

Sift4G

Benign

0.32

Polyphen

0.0040

Vest4

0.39

MVP

0.96

MPC

1.6

ClinPred

0.073

GERP RS

6.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.22

gMVP

0.92

Mutation Taster

=1/99

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over