2-31525215-C-T

Position:

• chr2-31525215-C-T

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 0P and 10B. BP4_Strong BP6_Moderate BS2

The NM_000348.4(SRD5A2):​c.*981G>A variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00407 in 222,538 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.0041 (2 hom., cov: 32)
  • Exomes 𝑓: 0.0041 (0 hom.)
• Consequence: SRD5A2 NM_000348.4 3_prime_UTR
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.0340

Genes affected

SRD5A2 (HGNC:11285): (steroid 5 alpha-reductase 2) This gene encodes a microsomal protein expressed at high levels in androgen-sensitive tissues such as the prostate. The encoded protein is active at acidic pH and is sensitive to the 4-azasteroid inhibitor finasteride. Deficiencies in this gene can result in male pseudohermaphroditism, specifically pseudovaginal perineoscrotal hypospadias (PPSH). [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -10 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.86).
• BP6: Variant 2-31525215-C-T is Benign according to our data. Variant chr2-31525215-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 895786.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS2: High Homozygotes in GnomAd4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SRD5A2	NM_000348.4	c.*981G>A		3_prime_UTR_variant	5/5	ENST00000622030.2
SRD5A2	XM_011533069.3	c.*981G>A		3_prime_UTR_variant	5/5
SRD5A2	XM_011533072.3	c.*981G>A		3_prime_UTR_variant	7/7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SRD5A2	ENST00000622030.2	c.*981G>A		3_prime_UTR_variant	5/5	1	NM_000348.4	P1

Frequencies

GnomAD3 genomes AF: 0.00407 AC: 619 AN: 152030 Hom.: 2 Cov.: 32

Gnomad AFR AF: 0.000942

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000983

Gnomad ASJ AF: 0.00259

Gnomad EAS AF: 0.000193

Gnomad SAS AF: 0.000414

Gnomad FIN AF: 0.0147

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.00580

Gnomad OTH AF: 0.000957

GnomAD4 exome AF: 0.00406 AC: 286 AN: 70390 Hom.: 0 Cov.: 0 AF XY: 0.00411 AC XY: 134 AN XY: 32582

Gnomad4 AFR exome AF: 0.000912

Gnomad4 AMR exome AF: 0.00144

Gnomad4 ASJ exome AF: 0.00223

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00575

Gnomad4 OTH exome AF: 0.00321

GnomAD4 genome AF: 0.00407 AC: 619 AN: 152148 Hom.: 2 Cov.: 32 AF XY: 0.00449 AC XY: 334 AN XY: 74406

Gnomad4 AFR AF: 0.000939

Gnomad4 AMR AF: 0.000981

Gnomad4 ASJ AF: 0.00259

Gnomad4 EAS AF: 0.000193

Gnomad4 SAS AF: 0.000415

Gnomad4 FIN AF: 0.0147

Gnomad4 NFE AF: 0.00580

Gnomad4 OTH AF: 0.000947

Alfa AF: 0.00545 Hom.: 1

Bravo AF: 0.00298

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

3-Oxo-5 alpha-steroid delta 4-dehydrogenase deficiency Benign:1

Likely benign, 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 and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.86
CADD	Benign	2.0
DANN	Benign	0.43

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: rs191186592; hg19: chr2-31750285;