1-150839318-T-A

Variant names:

• chr1-150839318-T-A
• rs2256355
• NM_001668.4:c.486+123A>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001668.4(ARNT):​c.486+123A>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 731,412 control chromosomes in the GnomAD database, with no homozygous occurrence. 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: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: ARNT NM_001668.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.612
• Publications: 0 publications found

Genes affected

ARNT (HGNC:700): (aryl hydrocarbon receptor nuclear translocator) This gene encodes a protein containing a basic helix-loop-helix domain and two characteristic PAS domains along with a PAC domain. The encoded protein binds to ligand-bound aryl hydrocarbon receptor and aids in the movement of this complex to the nucleus, where it promotes the expression of genes involved in xenobiotic metabolism. This protein is also a co-factor for transcriptional regulation by hypoxia-inducible factor 1. Chromosomal translocation of this locus with the ETV6 (ets variant 6) gene on chromosome 12 have been described in leukemias. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Oct 2013]

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.85).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001668.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ARNT	NM_001668.4	MANE Select	c.486+123A>T		intron	N/A	NP_001659.1
	ARNT	NM_001350225.2		c.483+123A>T		intron	N/A	NP_001337154.1
	ARNT	NM_001286036.2		c.486+123A>T		intron	N/A	NP_001272965.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ARNT	ENST00000358595.10	TSL:1 MANE Select	c.486+123A>T		intron	N/A	ENSP00000351407.5
	ARNT	ENST00000354396.6	TSL:1	c.486+123A>T		intron	N/A	ENSP00000346372.2
	ARNT	ENST00000515192.5	TSL:1	c.459+123A>T		intron	N/A	ENSP00000423851.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 1 AN: 731412 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 376690

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 18432

American (AMR) AF: 0.00 AC: 0 AN: 25504

Ashkenazi Jewish (ASJ) AF: 0.0000604 AC: 1 AN: 16560

East Asian (EAS) AF: 0.00 AC: 0 AN: 35268

South Asian (SAS) AF: 0.00 AC: 0 AN: 55516

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 43640

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3160

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 497752

Other (OTH) AF: 0.00 AC: 0 AN: 35580

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
CADD	Benign	1.3
DANN	Benign	0.61
PhyloP100		-0.61

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

Other links and lift over

dbSNP: rs2256355; hg19: chr1-150811794;