NM_000110.4:c.775A>G

Variant names:

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_000110.4(DPYD):c.775A>G(p.Lys259Glu) variant causes a missense change. The variant allele was found at a frequency of 0.00665 in 1,564,148 control chromosomes in the GnomAD database, including 45 homozygotes. 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 0.0051 ( 6 hom., cov: 32)

Exomes 𝑓: 0.0068 ( 39 hom. )

Consequence

DPYD
NM_000110.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:8

Conservation

PhyloP100: 3.87

Publications

35 publications found

Variant links:

Genes affected

DPYD (HGNC:3012): (dihydropyrimidine dehydrogenase) The protein encoded by this gene is a pyrimidine catabolic enzyme and the initial and rate-limiting factor in the pathway of uracil and thymidine catabolism. Mutations in this gene result in dihydropyrimidine dehydrogenase deficiency, an error in pyrimidine metabolism associated with thymine-uraciluria and an increased risk of toxicity in cancer patients receiving 5-fluorouracil chemotherapy. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2009]

DPYD Gene-Disease associations (from GenCC):

dihydropyrimidine dehydrogenase deficiency
Inheritance: AR Classification: DEFINITIVE Submitted by: G2P

DPYD links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.014378965).

BP6

Variant 1-97679170-T-C is Benign according to our data. Variant chr1-97679170-T-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 235464.

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.00514 (783/152264) while in subpopulation NFE AF = 0.00748 (509/68008). AF 95% confidence interval is 0.00695. There are 6 homozygotes in GnomAd4. There are 351 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 6 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DPYD	NM_000110.4 link	c.775A>G	p.Lys259Glu	missense_variant	Exon 8 of 23	ENST00000370192.8	NP_000101.2	Q12882-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DPYD	ENST00000370192.8 link	c.775A>G	p.Lys259Glu	missense_variant	Exon 8 of 23	1	NM_000110.4	ENSP00000359211.3		Q12882-1

Frequencies

GnomAD3 genomes

AF:

0.00514

AC:

782

AN:

152146

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00138

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00360

Gnomad ASJ

AF:

0.0181

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00497

Gnomad FIN

AF:

0.00594

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00748

Gnomad OTH

AF:

0.00527

GnomAD2 exomes

AF:

0.00620

AC:

1365

AN:

220112

AF XY:

0.00636

show subpopulations

Gnomad AFR exome

AF:

0.00146

Gnomad AMR exome

AF:

0.00316

Gnomad ASJ exome

AF:

0.0146

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00712

Gnomad NFE exome

AF:

0.00822

Gnomad OTH exome

AF:

0.00852

GnomAD4 exome

AF:

0.00681

AC:

9620

AN:

1411884

Hom.:

Cov.:

AF XY:

0.00679

AC XY:

4766

AN XY:

701658

show subpopulations

African (AFR)

AF:

0.000739

AC:

AN:

32456

American (AMR)

AF:

0.00342

AC:

147

AN:

42936

Ashkenazi Jewish (ASJ)

AF:

0.0162

AC:

407

AN:

25126

East Asian (EAS)

AF:

0.00

AC:

AN:

39100

South Asian (SAS)

AF:

0.00521

AC:

418

AN:

80262

European-Finnish (FIN)

AF:

0.00891

AC:

458

AN:

51400

Middle Eastern (MID)

AF:

0.00679

AC:

AN:

4862

European-Non Finnish (NFE)

AF:

0.00719

AC:

7746

AN:

1077446

Other (OTH)

AF:

0.00664

AC:

387

AN:

58296

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.452

Heterozygous variant carriers

379

758

1136

1515

1894

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

288

576

864

1152

1440

<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:

0.00514

AC:

783

AN:

152264

Hom.:

Cov.:

AF XY:

0.00471

AC XY:

351

AN XY:

74464

show subpopulations

African (AFR)

AF:

0.00137

AC:

AN:

41568

American (AMR)

AF:

0.00360

AC:

AN:

15284

Ashkenazi Jewish (ASJ)

AF:

0.0181

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5192

South Asian (SAS)

AF:

0.00518

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00594

AC:

AN:

10600

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00748

AC:

509

AN:

68008

Other (OTH)

AF:

0.00522

AC:

AN:

2108

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.498

Heterozygous variant carriers

128

170

213

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

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:

0.00644

Hom.:

Bravo

AF:

0.00511

TwinsUK

AF:

0.00863

AC:

ALSPAC

AF:

0.00701

AC:

ESP6500AA

AF:

0.00114

AC:

ESP6500EA

AF:

0.00747

AC:

ExAC

AF:

0.00611

AC:

736

Asia WGS

AF:

0.00145

AC:

AN:

3464

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:8

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Benign:3

PreventionGenetics, part of Exact Sciences

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jun 21, 2022

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: DPYD c.775A>G (p.Lys259Glu) results in a conservative amino acid change located in the FAD/NAD(P)-binding domain of the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.0061 in 251782 control chromosomes in the gnomAD database, including 12 homozygotes. The observed variant frequency is approximately 2.5 fold of the estimated maximal expected allele frequency for a pathogenic variant in DPYD causing Dihydropyrimidine Dehydrogenase Deficiency phenotype (0.0025), strongly suggesting that the variant is benign. c.775A>G has been reported in the literature in individuals affected with 5-FU-related toxicity (example Gross_2003, Schwab_2008, Harismendy_2013, Garcia-Gonzalez_2020). One of these studies described that DPYD enzyme activity measured in the cytosolic fraction of PBMCs from a heterozygous patient was in the normal range (Gross_2003). These reports do not provide unequivocal conclusions about association of the variant with Dihydropyrimidine Dehydrogenase Deficiency. At least one publication reports evaluating the impact of the variant on protein function in an in vitro expression system and found no damaging effect on enzymatic activity (Offer_2014). Five clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. Three laboratories classified the variant as benign, one as likely benign, and one as VUS. Based on the evidence outlined above, the variant was classified as benign. -

Nov 09, 2016

Eurofins Ntd Llc (ga)

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Benign:3

Jan 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

DPYD: BS1, BS2 -

Apr 21, 2016

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Nov 20, 2020

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 22935545, 14635116, 19473056, 24648345) -

Dihydropyrimidine dehydrogenase deficiency

Uncertain:1Benign:1

May 28, 2019

Mendelics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Inborn genetic diseases

Benign:1

Mar 16, 2018

Ambry Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

-0.15

BayesDel_noAF

Uncertain

0.020

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.27

Eigen

Benign

0.098

Eigen_PC

Benign

0.16

FATHMM_MKL

Uncertain

0.92

LIST_S2

Benign

0.85

MetaRNN

Benign

0.014

MetaSVM

Uncertain

0.42

MutationAssessor

Uncertain

2.6

PhyloP100

3.9

PrimateAI

Benign

0.44

PROVEAN

Uncertain

-2.7

REVEL

Uncertain

0.61

Sift

Uncertain

0.0050

Sift4G

Uncertain

0.0060

Polyphen

0.34

Vest4

0.85

MVP

0.92

MPC

0.093

ClinPred

0.025

GERP RS

4.5

Varity_R

0.37

gMVP

0.81

Mutation Taster

=83/17

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