X-67723746-G-T

Variant names:

• chrX-67723746-G-T
• NM_000044.6:c.2668G>T

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Moderate PP5_Moderate

The NM_000044.6(AR):​c.2668G>T​(p.Val890Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 21)
• Consequence: AR NM_000044.6 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.76

Genes affected

AR (HGNC:644): (androgen receptor) The androgen receptor gene is more than 90 kb long and codes for a protein that has 3 major functional domains: the N-terminal domain, DNA-binding domain, and androgen-binding domain. The protein functions as a steroid-hormone activated transcription factor. Upon binding the hormone ligand, the receptor dissociates from accessory proteins, translocates into the nucleus, dimerizes, and then stimulates transcription of androgen responsive genes. This gene contains 2 polymorphic trinucleotide repeat segments that encode polyglutamine and polyglycine tracts in the N-terminal transactivation domain of its protein. Expansion of the polyglutamine tract from the normal 9-34 repeats to the pathogenic 38-62 repeats causes spinal bulbar muscular atrophy (SBMA, also known as Kennedy's disease). Mutations in this gene are also associated with complete androgen insensitivity (CAIS). Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Jan 2017]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.848
• PP5: Variant X-67723746-G-T is Pathogenic according to our data. Variant chrX-67723746-G-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1338633.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AR	NM_000044.6	c.2668G>T	p.Val890Leu	missense_variant	Exon 8 of 8	ENST00000374690.9	NP_000035.2
AR	NM_001011645.3	c.1072G>T	p.Val358Leu	missense_variant	Exon 9 of 9		NP_001011645.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AR	ENST00000374690.9	c.2668G>T	p.Val890Leu	missense_variant	Exon 8 of 8	1	NM_000044.6	ENSP00000363822.3

Frequencies

GnomAD3 genomes Cov.: 21

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 21

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Mar 24, 2021

Genetic Services Laboratory, University of Chicago

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

DNA sequence analysis of the AR gene demonstrated a sequence change, c.2668G>T, in exon 8 that results in an amino acid change, p.Val890Leu. This sequence change is absent from known population databases (gnomAD). The p.Val890Leu change affects a highly conserved amino acid residue located in a domain of the AR protein that is known to be functional. The p.Val890Leu substitution appears to be deleterious using several in-silico pathogenicity prediction tools (SIFT, PolyPhen2, Align GVGD, REVEL). This particular sequence change (reported as p.Val889Leu) has been previously reported in individuals with AR-related disorders of sexual development (PMID: 20150575). A different pathogenic sequence change affecting the same amino acid residue (p.Val890Met, reported as p.Val889Met)) has also been described in individuals with AR-related disorders (PMID: 10425033). The p.Val890Leu amino acid change occurs in a region of the AR gene where other missense sequence changes have been described in patients with AR-related disorders. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.69	D
BayesDel_noAF	Pathogenic	0.76
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.10	T;.;.
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.97	D;D;D
M_CAP	Pathogenic	0.94	D
MetaRNN	Pathogenic	0.85	D;D;D
MetaSVM	Pathogenic	0.98	D
PrimateAI	Uncertain	0.76	T
PROVEAN	Benign	-2.2	.;N;D
REVEL	Pathogenic	0.95
Sift	Uncertain	0.0020	.;D;D
Sift4G	Uncertain	0.0040	D;D;D
Vest4		0.80
MVP		1.0
MPC		1.2
ClinPred		0.99	D
GERP RS		5.2
Varity_R		0.94
gMVP		0.96

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.070		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chrX-66943588;