chr16-1790724-A-G

Position:

• chr16-1790724-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_004970.3(IGFALS):​c.1694T>C​(p.Ile565Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000687 in 1,456,206 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I565M) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: IGFALS NM_004970.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.860

Genes affected

IGFALS (HGNC:5468): (insulin like growth factor binding protein acid labile subunit) The protein encoded by this gene is a serum protein that binds insulin-like growth factors, increasing their half-life and their vascular localization. Production of the encoded protein, which contains twenty leucine-rich repeats, is stimulated by growth hormone. Defects in this gene are a cause of acid-labile subunit deficiency, which maifests itself in a delayed and slow puberty. Three transcript variants encoding two different isoforms have been found for this gene. [provided by RefSeq, Mar 2009]

SPSB3 (HGNC:30629): (splA/ryanodine receptor domain and SOCS box containing 3) Predicted to be involved in proteasome-mediated ubiquitin-dependent protein catabolic process. Predicted to be located in cytosol. Predicted to be part of SCF ubiquitin ligase complex. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.119047076).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
IGFALS	NM_004970.3	c.1694T>C	p.Ile565Thr	missense_variant	2/2	ENST00000215539.4
IGFALS	NM_001146006.2	c.1808T>C	p.Ile603Thr	missense_variant	2/2
IGFALS	NR_027389.1	n.1748T>C		non_coding_transcript_exon_variant	2/2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IGFALS	ENST00000215539.4	c.1694T>C	p.Ile565Thr	missense_variant	2/2	1	NM_004970.3	P1
IGFALS	ENST00000415638.3	c.1808T>C	p.Ile603Thr	missense_variant	2/2	2
SPSB3	ENST00000569769.1	c.-13+2913T>C		intron_variant		3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000421 AC: 1 AN: 237728 Hom.: 0 AF XY: 0.00000772 AC XY: 1 AN XY: 129490

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000298

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.87e-7 AC: 1 AN: 1456206 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 724018

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000227

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Short stature due to primary acid-labile subunit deficiency Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.27	T
BayesDel_noAF	Benign	-0.54
CADD	Benign	0.84
DANN	Benign	0.59
DEOGEN2	Benign	0.096	T;.
Eigen	Benign	-1.4
Eigen_PC	Benign	-1.5
FATHMM_MKL	Benign	0.094	N
LIST_S2	Benign	0.63	T;T
M_CAP	Benign	0.065	D
MetaRNN	Benign	0.12	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.34	N;.
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.35	T
PROVEAN	Benign	-0.20	N;N
REVEL	Benign	0.019
Sift	Benign	0.11	T;T
Sift4G	Benign	0.29	T;T
Polyphen		0.094	B;.
Vest4		0.064
MutPred		0.65		Loss of stability (P = 0.0212);.;
MVP		0.24
MPC		0.060
ClinPred		0.13	T
GERP RS		-5.5
Varity_R		0.034
gMVP		0.44

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: rs886051775; hg19: chr16-1840725;