7-128398560-T-G

Position:

• chr7-128398560-T-G

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP3_Moderate PP5_Moderate

The NM_000883.4(IMPDH1):​c.928A>C​(p.Thr310Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. T310T) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: IMPDH1 NM_000883.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 7.99

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]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 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, 8 uncertain in NM_000883.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.916
• PP5: Variant 7-128398560-T-G is Pathogenic according to our data. Variant chr7-128398560-T-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 374177.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
IMPDH1	NM_000883.4	c.928A>C	p.Thr310Pro	missense_variant	10/17	ENST00000338791.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IMPDH1	ENST00000338791.11	c.928A>C	p.Thr310Pro	missense_variant	10/17	2	NM_000883.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Leber congenital amaurosis 11 Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Aug 22, 2019

This variant was classified as: Likely pathogenic. The following ACMG criteria were applied in classifying this variant: PM1,PM2,PP3,PP4. -

Retinitis pigmentosa Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Dec 10, 2013

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.36	D
BayesDel_noAF	Pathogenic	0.28
CADD	Pathogenic	31
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.66	.;.;.;.;D;.;D;.;D
Eigen	Pathogenic	0.92
Eigen_PC	Pathogenic	0.83
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.96	D;D;D;D;D;D;.;D;D
M_CAP	Pathogenic	0.38	D
MetaRNN	Pathogenic	0.92	D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.75	T
PROVEAN	Pathogenic	-5.4	D;D;D;D;.;D;D;D;D
REVEL	Pathogenic	0.86
Sift	Uncertain	0.0020	D;D;D;D;.;D;D;D;D
Sift4G	Uncertain	0.023	D;D;D;D;D;D;D;D;D
Polyphen		0.99, 0.99	.;.;D;.;.;D;.;.;.
Vest4		0.61
MutPred		0.63		.;.;.;.;.;.;.;.;Gain of disorder (P = 0.0429);
MVP		0.96
MPC		1.7
ClinPred		1.0	D
GERP RS		5.3
gMVP		0.92

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

LitVar

Other links and lift over

dbSNP: rs1057518949; hg19: chr7-128038614;