7-128406396-C-T

Position:

• chr7-128406396-C-T

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BS1 BS2

The NM_000883.4(IMPDH1):​c.255-531G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0129 in 149,730 control chromosomes in the GnomAD database, including 48 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 0.013 (48 hom., cov: 29)
• Consequence: IMPDH1 NM_000883.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0680

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).
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.013 (1939/149730) while in subpopulation AFR AF= 0.0453 (1834/40500). AF 95% confidence interval is 0.0436. There are 48 homozygotes in gnomad4. There are 914 alleles in male gnomad4 subpopulation. Median coverage is 29. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 1939 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
IMPDH1	NM_000883.4	c.255-531G>A		intron_variant		ENST00000338791.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IMPDH1	ENST00000338791.11	c.255-531G>A		intron_variant		2	NM_000883.4

Frequencies

GnomAD3 genomes AF: 0.0130 AC: 1938 AN: 149608 Hom.: 48 Cov.: 29

Gnomad AFR AF: 0.0454

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00539

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000637

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000119

Gnomad OTH AF: 0.00678

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

GnomAD4 genome AF: 0.0129 AC: 1939 AN: 149730 Hom.: 48 Cov.: 29 AF XY: 0.0125 AC XY: 914 AN XY: 73066

Gnomad4 AFR AF: 0.0453

Gnomad4 AMR AF: 0.00538

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000424

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000119

Gnomad4 OTH AF: 0.00670

Alfa AF: 0.00310 Hom.: 3

Bravo AF: 0.0148

Asia WGS AF: 0.00115 AC: 4 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	7.1
DANN	Benign	0.60

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs72624943; hg19: chr7-128046450;