NM_000883.4:c.1142A>G

Variant names:

Variant summary

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

The NM_000883.4(IMPDH1):c.1142A>G(p.His381Arg) variant causes a missense change. The variant allele was found at a frequency of 0.00334 in 1,613,000 control chromosomes in the GnomAD database, including 14 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/19 in silico tools predict a benign 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. H381Y) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0021 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0035 ( 14 hom. )

Consequence

IMPDH1
NM_000883.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:5

Conservation

PhyloP100: 6.05

Publications

8 publications found

Variant links:

Genes affected

IMPDH1 (HGNC:6052): (inosine monophosphate dehydrogenase 1) The protein encoded by this gene acts as a homotetramer to regulate cell growth. The encoded protein is an enzyme that catalyzes the synthesis of xanthine monophosphate (XMP) from inosine-5'-monophosphate (IMP). This is the rate-limiting step in the de novo synthesis of guanine nucleotides. Defects in this gene are a cause of retinitis pigmentosa type 10 (RP10). Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2008]

IMPDH1 Gene-Disease associations (from GenCC):

inherited retinal dystrophy
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
Leber congenital amaurosis 11
Inheritance: AD Classification: DEFINITIVE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), G2P
retinitis pigmentosa 10
Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
Leber congenital amaurosis
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
retinitis pigmentosa
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

IMPDH1 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=0.01203832).

BP6

Variant 7-128396955-T-C is Benign according to our data. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014. Variant chr7-128396955-T-C is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 707014.

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.00212 (322/151904) while in subpopulation NFE AF = 0.0035 (238/67932). AF 95% confidence interval is 0.00314. There are 0 homozygotes in GnomAd4. There are 161 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High AC in GnomAd4 at 322 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IMPDH1	NM_000883.4 link	c.1142A>G	p.His381Arg	missense_variant	Exon 11 of 17	ENST00000338791.11	NP_000874.2	P20839-6B3KRZ3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IMPDH1	ENST00000338791.11 link	c.1142A>G	p.His381Arg	missense_variant	Exon 11 of 17	2	NM_000883.4	ENSP00000345096.6		P20839-6

Frequencies

GnomAD3 genomes

AF:

0.00212

AC:

322

AN:

151788

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000702

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00302

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000623

Gnomad FIN

AF:

0.000190

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00350

Gnomad OTH

AF:

0.00192

GnomAD2 exomes

AF:

0.00216

AC:

542

AN:

251250

AF XY:

0.00236

show subpopulations

Gnomad AFR exome

AF:

0.000616

Gnomad AMR exome

AF:

0.000983

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000601

Gnomad NFE exome

AF:

0.00373

Gnomad OTH exome

AF:

0.00261

GnomAD4 exome

AF:

0.00347

AC:

5065

AN:

1461096

Hom.:

Cov.:

AF XY:

0.00337

AC XY:

2452

AN XY:

726908

show subpopulations

African (AFR)

AF:

0.000598

AC:

AN:

33458

American (AMR)

AF:

0.00114

AC:

AN:

44716

Ashkenazi Jewish (ASJ)

AF:

0.0000383

AC:

AN:

26130

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00130

AC:

112

AN:

86230

European-Finnish (FIN)

AF:

0.000787

AC:

AN:

53348

Middle Eastern (MID)

AF:

0.00362

AC:

AN:

5528

European-Non Finnish (NFE)

AF:

0.00415

AC:

4618

AN:

1111642

Other (OTH)

AF:

0.00333

AC:

201

AN:

60344

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.471

Heterozygous variant carriers

250

501

751

1002

1252

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

178

356

534

712

890

<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:

0.00212

AC:

322

AN:

151904

Hom.:

Cov.:

AF XY:

0.00217

AC XY:

161

AN XY:

74246

show subpopulations

African (AFR)

AF:

0.000700

AC:

AN:

41420

American (AMR)

AF:

0.00301

AC:

AN:

15260

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5170

South Asian (SAS)

AF:

0.000623

AC:

AN:

4812

European-Finnish (FIN)

AF:

0.000190

AC:

AN:

10538

Middle Eastern (MID)

AF:

0.00

AC:

AN:

292

European-Non Finnish (NFE)

AF:

0.00350

AC:

238

AN:

67932

Other (OTH)

AF:

0.00190

AC:

AN:

2104

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.508

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:

0.00230

Hom.:

Bravo

AF:

0.00228

TwinsUK

AF:

0.00270

AC:

ALSPAC

AF:

0.00519

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00267

AC:

ExAC

AF:

0.00228

AC:

277

EpiCase

AF:

0.00414

EpiControl

AF:

0.00433

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:5

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Benign:4

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Clinical Genetics, Academic Medical Center

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Jan 28, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Mar 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

IMPDH1: BP4, BS1, BS2 -

Leber congenital amaurosis 11

Uncertain:1

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. -

Retinitis pigmentosa

Uncertain:1

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). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Retinal dystrophy

Benign:1

Jan 01, 2012

Institute of Human Genetics, Univ. Regensburg, Univ. Regensburg

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Benign

-0.41

BayesDel_noAF

Benign

-0.36

CADD

Benign

(source)

DANN

Uncertain

0.97

DEOGEN2

Benign

0.18

.;.;.;.;T;.;T;.

Eigen

Benign

-0.31

Eigen_PC

Benign

-0.11

FATHMM_MKL

Uncertain

0.92

LIST_S2

Benign

0.66

T;T;T;T;T;T;.;T

M_CAP

Benign

0.026

MetaRNN

Benign

0.012

T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.87

PhyloP100

6.1

PrimateAI

Benign

0.44

PROVEAN

Benign

-0.86

N;N;N;N;.;N;N;N

REVEL

Benign

0.27

Sift

Benign

0.18

T;T;T;T;.;T;T;T

Sift4G

Benign

0.094

T;T;T;T;T;T;T;T

Polyphen

0.0, 0.0010

.;.;B;.;.;B;.;.

Vest4

0.26

MVP

0.79

MPC

0.65

ClinPred

0.028

GERP RS

3.9

gMVP

0.55

Mutation Taster

=88/12

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