Genetic Variant FTO:p.Met1? (chr16-53704185-A-C) – ACMG Classification: Uncertain_significance (3 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PVS1_SupportingPM2

The NM_001080432.3(FTO):c.1A>C(p.Met1?) variant causes a initiator codon change. The variant allele was found at a frequency of 0.00000143 in 1,399,200 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

FTO
NM_001080432.3 initiator_codon

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 5.12

Publications

50 publications found

Variant links:

Genes affected

FTO (HGNC:24678): (FTO alpha-ketoglutarate dependent dioxygenase) This gene is a nuclear protein of the AlkB related non-haem iron and 2-oxoglutarate-dependent oxygenase superfamily but the exact physiological function of this gene is not known. Other non-heme iron enzymes function to reverse alkylated DNA and RNA damage by oxidative demethylation. Studies in mice and humans indicate a role in nervous and cardiovascular systems and a strong association with body mass index, obesity risk, and type 2 diabetes. [provided by RefSeq, Jul 2011]

FTO links:

RPGRIP1L (HGNC:29168): (RPGRIP1 like) The protein encoded by this gene can localize to the basal body-centrosome complex or to primary cilia and centrosomes in ciliated cells. The encoded protein has been found to interact with nephrocystin-4. Defects in this gene are a cause of Joubert syndrome type 7 (JBTS7) and Meckel syndrome type 5 (MKS5). [provided by RefSeq, Jun 2016]

RPGRIP1L Gene-Disease associations (from GenCC):

Meckel syndrome, type 5
Inheritance: AR Classification: DEFINITIVE Submitted by: G2P
Joubert syndrome 7
Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
COACH syndrome 1
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Joubert syndrome with renal defect
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Meckel syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

RPGRIP1L links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

PVS1

Start lost variant, no pathogenic variants between lost start and next in-frame start position. Next in-frame start position is after 172 codons. Genomic position: 53826254. Lost 0.339 part of the original CDS.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FTO	NM_001080432.3 link	c.1A>C	p.Met1?	initiator_codon_variant	Exon 1 of 9	ENST00000471389.6	NP_001073901.1	Q9C0B1-1B3KU60Q99770

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FTO	ENST00000471389.6 link	c.1A>C	p.Met1?	initiator_codon_variant	Exon 1 of 9	1	NM_001080432.3	ENSP00000418823.1		Q9C0B1-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000645

AC:

AN:

155084

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000651

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000143

AC:

AN:

1399200

Hom.:

Cov.:

AF XY:

0.00000145

AC XY:

AN XY:

690124

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

31590

American (AMR)

AF:

0.00

AC:

AN:

35696

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25178

East Asian (EAS)

AF:

0.00

AC:

AN:

35738

South Asian (SAS)

AF:

0.00

AC:

AN:

79228

European-Finnish (FIN)

AF:

0.0000406

AC:

AN:

49246

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5694

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1078842

Other (OTH)

AF:

0.00

AC:

AN:

57988

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.34

BayesDel_noAF

Pathogenic

0.25

CADD

Uncertain

(source)

DANN

Benign

0.97

DEOGEN2

Uncertain

0.46

.;T;T;.;T

Eigen

Uncertain

0.60

Eigen_PC

Uncertain

0.64

FATHMM_MKL

Benign

0.58

LIST_S2

Uncertain

0.90

D;D;D;D;D

M_CAP

Pathogenic

0.64

MetaRNN

Uncertain

0.65

D;D;D;D;D

MetaSVM

Uncertain

-0.21

PhyloP100

5.1

PROVEAN

Benign

-0.74

.;N;.;.;.

REVEL

Uncertain

0.35

Sift

Pathogenic

0.0

.;D;.;.;.

Sift4G

Pathogenic

0.0

.;D;.;.;.

Polyphen

0.85

.;P;.;.;.

Vest4

0.92

MutPred

0.54

Loss of catalytic residue at M1 (P = 0.0203);Loss of catalytic residue at M1 (P = 0.0203);Loss of catalytic residue at M1 (P = 0.0203);Loss of catalytic residue at M1 (P = 0.0203);Loss of catalytic residue at M1 (P = 0.0203);

MVP

0.82

ClinPred

0.91

GERP RS

6.0

PromoterAI

0.011

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.93

gMVP

0.41

Mutation Taster

=6/194

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

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over