16-1790767-C-T

Position:

chr16-1790767-C-T

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2BP4_StrongBS1_Supporting

The NM_004970.3(IGFALS):c.1651G>A(p.Ala551Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000647 in 1,592,180 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00018 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000053 ( 0 hom. )

Consequence

IGFALS
NM_004970.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 1.61

Variant links:

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]

IGFALS links:

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]

SPSB3 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.063322484).

BS1

Variant frequency is greater than expected in population afr. gnomad4_exome allele frequency = 0.0000528 (76/1439862) while in subpopulation AFR AF= 0.000938 (31/33052). AF 95% confidence interval is 0.000679. There are 0 homozygotes in gnomad4_exome. There are 37 alleles in male gnomad4_exome subpopulation. Median coverage is 30. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
IGFALS	NM_004970.3 linkuse as main transcript	c.1651G>A	p.Ala551Thr	missense_variant	2/2	ENST00000215539.4
IGFALS	NM_001146006.2 linkuse as main transcript	c.1765G>A	p.Ala589Thr	missense_variant	2/2
IGFALS	NR_027389.1 linkuse as main transcript	n.1705G>A		non_coding_transcript_exon_variant	2/2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IGFALS	ENST00000215539.4 linkuse as main transcript	c.1651G>A	p.Ala551Thr	missense_variant	2/2	1	NM_004970.3	P1	P35858-1
IGFALS	ENST00000415638.3 linkuse as main transcript	c.1765G>A	p.Ala589Thr	missense_variant	2/2	2			P35858-2
SPSB3	ENST00000569769.1 linkuse as main transcript	c.-13+2870G>A		intron_variant		3

Frequencies

GnomAD3 genomes

AF:

0.000177

AC:

AN:

152200

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000507

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000414

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.000957

GnomAD3 exomes

AF:

0.0000919

AC:

AN:

206670

Hom.:

AF XY:

0.0000803

AC XY:

AN XY:

112090

show subpopulations

Gnomad AFR exome

AF:

0.000822

Gnomad AMR exome

AF:

0.0000672

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000328

Gnomad SAS exome

AF:

0.0000377

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000190

GnomAD4 exome

AF:

0.0000528

AC:

AN:

1439862

Hom.:

Cov.:

AF XY:

0.0000518

AC XY:

AN XY:

714602

show subpopulations

Gnomad4 AFR exome

AF:

0.000938

Gnomad4 AMR exome

AF:

0.0000729

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000468

Gnomad4 SAS exome

AF:

0.0000241

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000163

Gnomad4 OTH exome

AF:

0.0000672

GnomAD4 genome

AF:

0.000177

AC:

AN:

152318

Hom.:

Cov.:

AF XY:

0.000215

AC XY:

AN XY:

74484

show subpopulations

Gnomad4 AFR

AF:

0.000505

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000415

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.000947

Alfa

AF:

0.000153

Hom.:

Bravo

AF:

0.000242

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000519

AC:

ExAC

AF:

0.0000669

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 16, 2024

The c.1651G>A (p.A551T) alteration is located in exon 2 (coding exon 2) of the IGFALS gene. This alteration results from a G to A substitution at nucleotide position 1651, causing the alanine (A) at amino acid position 551 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Short stature due to primary acid-labile subunit deficiency

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 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

0.10

BayesDel_addAF

Benign

-0.48

BayesDel_noAF

Benign

-0.53

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.12

T;.

Eigen

Benign

-0.34

Eigen_PC

Benign

-0.45

FATHMM_MKL

Benign

0.29

LIST_S2

Benign

0.71

T;T

M_CAP

Benign

0.058

MetaRNN

Benign

0.063

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.7

L;.

MutationTaster

Benign

1.0

N;N

PrimateAI

Benign

0.44

PROVEAN

Benign

-1.1

N;N

REVEL

Benign

0.083

Sift

Uncertain

0.018

D;D

Sift4G

Uncertain

0.055

T;D

Polyphen

0.97

D;.

Vest4

0.076

MVP

0.65

MPC

0.051

ClinPred

0.059

GERP RS

-0.22

Varity_R

0.091

gMVP

0.53

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over