11-67490803-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_003977.4(AIP):c.803A>G(p.Tyr268Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,459,962 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic 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. Y268H) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: AIP NM_003977.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2 O:1
• Conservation: PhyloP100: 2.19

Genes affected

AIP (HGNC:358): (aryl hydrocarbon receptor interacting protein) The protein encoded by this gene is a receptor for aryl hydrocarbons and a ligand-activated transcription factor. The encoded protein is found in the cytoplasm as part of a multiprotein complex, but upon binding of ligand is transported to the nucleus. This protein can regulate the expression of many xenobiotic metabolizing enzymes. Also, the encoded protein can bind specifically to and inhibit the activity of hepatitis B virus. Three transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2014]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.84

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AIP	NM_003977.4	c.803A>G	p.Tyr268Cys	missense_variant	6/6	ENST00000279146.8
AIP	NM_001302959.2	c.626A>G	p.Tyr209Cys	missense_variant	6/6
AIP	NM_001302960.2	c.795A>G	p.Leu265=	synonymous_variant	6/6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AIP	ENST00000279146.8	c.803A>G	p.Tyr268Cys	missense_variant	6/6	1	NM_003977.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000402 AC: 1 AN: 248862 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135232

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

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: 0.00000896

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1459962 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 726300

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Nov 17, 2023

This sequence change replaces tyrosine, which is neutral and polar, with cysteine, which is neutral and slightly polar, at codon 268 of the AIP protein (p.Tyr268Cys). This variant is present in population databases (rs267606577, gnomAD 0.0009%). This missense change has been observed in individual(s) with a prolactinoma (PMID: 21753072). ClinVar contains an entry for this variant (Variation ID: 41206). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on AIP protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 01, 2022

The p.Y268C variant (also known as c.803A>G), located in coding exon 6 of the AIP gene, results from an A to G substitution at nucleotide position 803. The tyrosine at codon 268 is replaced by cysteine, an amino acid with highly dissimilar properties. This alteration has been reported in individuals with apparent sporadic pituitary macroadenomas (Tichomirowa MA et al. Eur. J. Endocrinol., 2011 Oct;165:509-15; Beckers A et al. Endocr. Rev., 2013 Apr;34:239-77). This alteration is located in the functional significant tetratricopeptide repeat domain of the AIP protein, and a structural analysis suggests it may disrupt packing of the hydrophobic core (Morgan RM et al. PLoS ONE, 2012 Dec;7:e53339). This amino acid position is not well conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Somatotroph adenoma Other:1

not provided, no classification provided

literature only

GeneReviews

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.21
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.20
Cadd	Pathogenic	28
Dann	Uncertain	1.0
DEOGEN2	Benign	0.20	T;.
Eigen	Uncertain	0.57
Eigen_PC	Uncertain	0.55
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Benign	0.82	T;T
M_CAP	Uncertain	0.098	D
MetaRNN	Pathogenic	0.84	D;D
MetaSVM	Uncertain	0.091	D
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.81	D
Sift4G	Uncertain	0.0070	D;D
Vest4		0.89
MutPred		0.65		.;Loss of MoRF binding (P = 0.0854);
MVP		0.91
MPC		1.1
ClinPred		0.97	D
GERP RS		5.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
gMVP		0.75

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: rs267606577; hg19: chr11-67258274;