13-27924669-G-T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 1P and 5B. PP2BP4_StrongBS1_Supporting

The NM_000209.4(PDX1):c.820G>T(p.Val274Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000224 in 1,471,184 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V274I) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000022 ( 0 hom. )

Consequence

PDX1
NM_000209.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 0.179

Publications

0 publications found

Variant links:

Genes affected

PDX1 (HGNC:6107): (pancreatic and duodenal homeobox 1) The protein encoded by this gene is a transcriptional activator of several genes, including insulin, somatostatin, glucokinase, islet amyloid polypeptide, and glucose transporter type 2. The encoded nuclear protein is involved in the early development of the pancreas and plays a major role in glucose-dependent regulation of insulin gene expression. Defects in this gene are a cause of pancreatic agenesis, which can lead to early-onset insulin-dependent diabetes mellitus (IDDM), as well as maturity onset diabetes of the young type 4 (MODY4). [provided by RefSeq, Aug 2017]

PDX1 Gene-Disease associations (from GenCC):

maturity-onset diabetes of the young type 4
Inheritance: AR, AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, Ambry Genetics, Labcorp Genetics (formerly Invitae)
pancreatic agenesis 1
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: ClinGen, Genomics England PanelApp, Ambry Genetics, Labcorp Genetics (formerly Invitae)
permanent neonatal diabetes mellitus
Inheritance: AR, AD Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet
monogenic diabetes
Inheritance: AD Classification: MODERATE Submitted by: ClinGen
maturity-onset diabetes of the young
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
pancreatic agenesis
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

PDX1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -4 ACMG points.

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 7 curated pathogenic missense variants (we use a threshold of 10). The gene has 1 curated benign missense variants. Gene score misZ: -0.26592 (below the threshold of 3.09). Trascript score misZ: -1.1553 (below the threshold of 3.09). GenCC associations: The gene is linked to pancreatic agenesis 1, monogenic diabetes, pancreatic agenesis, maturity-onset diabetes of the young, permanent neonatal diabetes mellitus, maturity-onset diabetes of the young type 4.

BP4

Computational evidence support a benign effect (MetaRNN=0.0638015).

BS1

Variant frequency is greater than expected in population amr. GnomAdExome4 allele frequency = 0.000022 (29/1319012) while in subpopulation AMR AF = 0.000873 (24/27476). AF 95% confidence interval is 0.000601. There are 0 homozygotes in GnomAdExome4. There are 22 alleles in the male GnomAdExome4 subpopulation. Median coverage is 31. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PDX1	NM_000209.4 link	c.820G>T	p.Val274Phe	missense_variant	Exon 2 of 2	ENST00000381033.5	NP_000200.1	P52945

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PDX1	ENST00000381033.5 link	c.820G>T	p.Val274Phe	missense_variant	Exon 2 of 2	1	NM_000209.4	ENSP00000370421.4		P52945

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152172

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000228

AC:

AN:

83252

AF XY:

0.000273

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00101

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00125

GnomAD4 exome

AF:

0.0000220

AC:

AN:

1319012

Hom.:

Cov.:

AF XY:

0.0000339

AC XY:

AN XY:

649234

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

27050

American (AMR)

AF:

0.000873

AC:

AN:

27476

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

23504

East Asian (EAS)

AF:

0.00

AC:

AN:

29502

South Asian (SAS)

AF:

0.00

AC:

AN:

70882

European-Finnish (FIN)

AF:

0.00

AC:

AN:

32894

Middle Eastern (MID)

AF:

0.00

AC:

AN:

3930

European-Non Finnish (NFE)

AF:

0.00000191

AC:

AN:

1048916

Other (OTH)

AF:

0.0000547

AC:

AN:

54858

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.504

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152172

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74330

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41454

American (AMR)

AF:

0.000262

AC:

AN:

15284

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5178

South Asian (SAS)

AF:

0.00

AC:

AN:

4836

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10612

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68016

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.563

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:

0.0000712

Hom.:

Bravo

AF:

0.0000416

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Oct 30, 2017

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The V274F variant has not been published as a pathogenic variant, nor has it been reported as a benign variant to our knowledge. The variant is observed in 15/16078 (0.09%) alleles from individuals of Latino background in large population cohorts (Lek et al., 2016). V274F is a semi-conservative amino acid substitution, which may impact secondary protein structure as these residues differ in some properties. However, this substitution occurs at a position that is not conserved, and in silico analysis predicts this variant likely does not alter the protein structure/function. In summary, based on the currently available information, it is unclear whether this variant is a pathogenic variant or a rare benign variant. -

Jul 30, 2019

Athena Diagnostics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not specified

Uncertain:1

Oct 25, 2019

Genetic Services Laboratory, University of Chicago

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Type 2 diabetes mellitus;C1833382:Maturity-onset diabetes of the young type 4;C3891828:Pancreatic agenesis 1

Uncertain:1

Jan 04, 2022

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Benign

-0.29

BayesDel_noAF

Benign

-0.26

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.39

Eigen

Benign

-0.93

Eigen_PC

Benign

-0.88

FATHMM_MKL

Benign

0.38

LIST_S2

Benign

0.50

M_CAP

Uncertain

0.20

MetaRNN

Benign

0.064

MetaSVM

Benign

-0.58

MutationAssessor

Benign

0.90

PhyloP100

0.18

PrimateAI

Uncertain

0.72

PROVEAN

Benign

-0.85

REVEL

Benign

0.18

Sift

Uncertain

0.0070

Sift4G

Uncertain

0.049

Polyphen

0.15

Vest4

0.21

MutPred

0.25

Gain of glycosylation at P271 (P = 0.1234);

MVP

0.58

MPC

1.3

ClinPred

0.045

GERP RS

1.5

Varity_R

0.074

gMVP

0.55

Mutation Taster

=98/2

polymorphism

(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

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over