7-128406715-T-G

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_000883.4(IMPDH1):c.255-850A>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0675 in 152,282 control chromosomes in the GnomAD database, including 737 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.068 (737 hom., cov: 31)
• Consequence: IMPDH1 NM_000883.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0820

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 Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.81).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.224 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
IMPDH1	NM_000883.4	c.255-850A>C		intron_variant		ENST00000338791.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IMPDH1	ENST00000338791.11	c.255-850A>C		intron_variant		2	NM_000883.4

Frequencies

GnomAD3 genomes AF: 0.0676 AC: 10283 AN: 152164 Hom.: 735 Cov.: 31

Gnomad AFR AF: 0.0155

Gnomad AMI AF: 0.0164

Gnomad AMR AF: 0.203

Gnomad ASJ AF: 0.0392

Gnomad EAS AF: 0.234

Gnomad SAS AF: 0.0887

Gnomad FIN AF: 0.0708

Gnomad MID AF: 0.0348

Gnomad NFE AF: 0.0571

Gnomad OTH AF: 0.0485

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.0675 AC: 10284 AN: 152282 Hom.: 737 Cov.: 31 AF XY: 0.0727 AC XY: 5411 AN XY: 74452

Gnomad4 AFR AF: 0.0154

Gnomad4 AMR AF: 0.203

Gnomad4 ASJ AF: 0.0392

Gnomad4 EAS AF: 0.235

Gnomad4 SAS AF: 0.0876

Gnomad4 FIN AF: 0.0708

Gnomad4 NFE AF: 0.0571

Gnomad4 OTH AF: 0.0470

Alfa AF: 0.0580 Hom.: 48

Bravo AF: 0.0746

Asia WGS AF: 0.169 AC: 587 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.81
Cadd	Benign	4.9
Dann	Benign	0.57

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs28364722; hg19: chr7-128046769;