7-128405647-G-T

Position:

• chr7-128405647-G-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.353+120C>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00181 in 1,355,258 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 0.0093 (23 hom., cov: 32)
  • Exomes 𝑓: 0.00086 (25 hom.)
• Consequence: IMPDH1 NM_000883.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.911

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=-0.78).
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00929 (1411/151822) while in subpopulation AFR AF= 0.0328 (1352/41242). AF 95% confidence interval is 0.0313. There are 23 homozygotes in gnomad4. There are 642 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 1411 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
IMPDH1	NM_000883.4	c.353+120C>A		intron_variant		ENST00000338791.11	NP_000874.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
IMPDH1	ENST00000338791.11	c.353+120C>A		intron_variant		2	NM_000883.4	ENSP00000345096.6

Frequencies

GnomAD3 genomes AF: 0.00927 AC: 1406 AN: 151718 Hom.: 23 Cov.: 32

Gnomad AFR AF: 0.0327

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00282

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00766

GnomAD4 exome AF: 0.000861 AC: 1036 AN: 1203436 Hom.: 25 AF XY: 0.000802 AC XY: 474 AN XY: 590788

Gnomad4 AFR exome AF: 0.0379

Gnomad4 AMR exome AF: 0.00159

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000164

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000821

Gnomad4 OTH exome AF: 0.00233

GnomAD4 genome AF: 0.00929 AC: 1411 AN: 151822 Hom.: 23 Cov.: 32 AF XY: 0.00865 AC XY: 642 AN XY: 74244

Gnomad4 AFR AF: 0.0328

Gnomad4 AMR AF: 0.00281

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00758

Alfa AF: 0.000141 Hom.: 0

Bravo AF: 0.0110

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.78
CADD	Benign	0.21
DANN	Benign	0.93

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs72624950; hg19: chr7-128045701;