NM_000875.5:c.-36_-33delTTTT

Variant names:

• chr15-98649525-CTTTT-C
• rs544674838
• NM_000875.5:c.-36_-33delTTTT

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BS1 BS2

The NM_000875.5(IGF1R):​c.-36_-33delTTTT variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00984 in 721,932 control chromosomes in the GnomAD database, including 34 homozygotes. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.020 (24 hom., cov: 0)
  • Exomes 𝑓: 0.0077 (10 hom.)
• Consequence: IGF1R NM_000875.5 5_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.58

Genes affected

IGF1R (HGNC:5465): (insulin like growth factor 1 receptor) This receptor binds insulin-like growth factor with a high affinity. It has tyrosine kinase activity. The insulin-like growth factor I receptor plays a critical role in transformation events. Cleavage of the precursor generates alpha and beta subunits. It is highly overexpressed in most malignant tissues where it functions as an anti-apoptotic agent by enhancing cell survival. Alternatively spliced transcript variants encoding distinct isoforms have been found for this gene. [provided by RefSeq, May 2014]

IRAIN (HGNC:50365): (IGF1R antisense imprinted non-protein coding RNA) This gene expresses a long non-coding RNA in antisense to the insulin-like growth factor type I receptor (IGF1R) gene. This transcript is imprinted and expressed from the paternal allele. It interacts with chromatin and may promote long-range DNA interactions that influence the regulation of gene expression. [provided by RefSeq, Nov 2015]

ACMG classification

Verdict is Benign. Variant got -8 ACMG points.

• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0199 (2480/124532) while in subpopulation AFR AF= 0.0361 (1217/33680). AF 95% confidence interval is 0.0344. There are 24 homozygotes in gnomad4. There are 1190 alleles in male gnomad4 subpopulation. Median coverage is 0. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 24 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IGF1R	NM_000875.5	c.-36_-33delTTTT		5_prime_UTR_variant	Exon 1 of 21	ENST00000650285.1	NP_000866.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IGF1R	ENST00000650285	c.-36_-33delTTTT		5_prime_UTR_variant	Exon 1 of 21		NM_000875.5	ENSP00000497069.1
IGF1R	ENST00000649865	c.-36_-33delTTTT		5_prime_UTR_variant	Exon 1 of 21			ENSP00000496919.1
IGF1R	ENST00000559925.5	n.-56_-53delTTTT		upstream_gene_variant		1

Frequencies

GnomAD3 genomes AF: 0.0199 AC: 2478 AN: 124524 Hom.: 24 Cov.: 0

Gnomad AFR AF: 0.0362

Gnomad AMI AF: 0.00252

Gnomad AMR AF: 0.0108

Gnomad ASJ AF: 0.0214

Gnomad EAS AF: 0.00373

Gnomad SAS AF: 0.0215

Gnomad FIN AF: 0.0185

Gnomad MID AF: 0.0217

Gnomad NFE AF: 0.0140

Gnomad OTH AF: 0.0162

GnomAD4 exome AF: 0.00774 AC: 4622 AN: 597400 Hom.: 10 AF XY: 0.00773 AC XY: 2463 AN XY: 318646

Gnomad4 AFR exome AF: 0.0251

Gnomad4 AMR exome AF: 0.00738

Gnomad4 ASJ exome AF: 0.00815

Gnomad4 EAS exome AF: 0.00560

Gnomad4 SAS exome AF: 0.00938

Gnomad4 FIN exome AF: 0.00856

Gnomad4 NFE exome AF: 0.00689

Gnomad4 OTH exome AF: 0.00971

GnomAD4 genome AF: 0.0199 AC: 2480 AN: 124532 Hom.: 24 Cov.: 0 AF XY: 0.0200 AC XY: 1190 AN XY: 59468

Gnomad4 AFR AF: 0.0361

Gnomad4 AMR AF: 0.0109

Gnomad4 ASJ AF: 0.0214

Gnomad4 EAS AF: 0.00374

Gnomad4 SAS AF: 0.0216

Gnomad4 FIN AF: 0.0185

Gnomad4 NFE AF: 0.0140

Gnomad4 OTH AF: 0.0161

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.090		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: rs544674838; hg19: chr15-99192754;