NM_024592.5:c.506A>G

Variant names:

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2PP3_StrongPP5

The NM_024592.5(SRD5A3):c.506A>G(p.Tyr169Cys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000744 in 1,613,976 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 Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000075 ( 0 hom. )

Consequence

SRD5A3
NM_024592.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2U:2

Conservation

PhyloP100: 9.05

Variant links:

Genes affected

SRD5A3 (HGNC:25812): (steroid 5 alpha-reductase 3) The protein encoded by this gene belongs to the steroid 5-alpha reductase family, and polyprenol reductase subfamily. It is involved in the production of androgen 5-alpha-dihydrotestosterone (DHT) from testosterone, and maintenance of the androgen-androgen receptor activation pathway. This protein is also necessary for the conversion of polyprenol into dolichol, which is required for the synthesis of dolichol-linked monosaccharides and the oligosaccharide precursor used for N-linked glycosylation of proteins. Mutations in this gene are associated with congenital disorder of glycosylation type Iq. [provided by RefSeq, Mar 2011]

SRD5A3 links:

ENSG00000288695 (HGNC:):

ENSG00000288695 links:

SRD5A3-AS1 (HGNC:44138): (SRD5A3 antisense RNA 1)

SRD5A3-AS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.963

PP5

Variant 4-55364215-A-G is Pathogenic according to our data. Variant chr4-55364215-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 2506565.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=2}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SRD5A3	NM_024592.5 link	c.506A>G	p.Tyr169Cys	missense_variant	Exon 3 of 5	ENST00000264228.9	NP_078868.1	Q9H8P0
SRD5A3	NM_001410732.1 link	c.506A>G	p.Tyr169Cys	missense_variant	Exon 3 of 4		NP_001397661.1
SRD5A3	XM_017008601.2 link	c.371A>G	p.Tyr124Cys	missense_variant	Exon 3 of 5		XP_016864090.1
SRD5A3	XM_005265767.4 link	c.364+4727A>G		intron_variant	Intron 2 of 2		XP_005265824.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SRD5A3	ENST00000264228.9 link	c.506A>G	p.Tyr169Cys	missense_variant	Exon 3 of 5	1	NM_024592.5	ENSP00000264228.4		Q9H8P0
ENSG00000288695	ENST00000679707.1 link	c.506A>G	p.Tyr169Cys	missense_variant	Exon 3 of 6			ENSP00000505713.1		A0A7P0T9P9

Frequencies

GnomAD3 genomes

AF:

0.00000658

AC:

AN:

152088

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000278

AC:

AN:

251460

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135904

show subpopulations

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:

0.000163

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000176

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000752

AC:

AN:

1461888

Hom.:

Cov.:

AF XY:

0.00000963

AC XY:

AN XY:

727244

show subpopulations

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:

0.0000927

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000270

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000658

AC:

AN:

152088

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74274

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ExAC

AF:

0.0000247

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2Uncertain:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

SRD5A3-congenital disorder of glycosylation

Pathogenic:1Uncertain:1

Jun 24, 2023

Institute of Medical Genetics and Genomics, Sir Ganga Ram Hospital

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This novel homozygous variant has been identified in a proband with global developmental delay, deep set eyes, nystagmus, bilateral epicanthal folds, temporal balding, flapping of hands, happy demeanor, self absorbed. This variant has been identified in 0.0028% in gnomAD (aggregated) (PM2_moderate). -

Dec 06, 2024

Molecular Genetics, Royal Melbourne Hospital

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change in SRD5A3 is predicted to replace tyrosine with cysteine at codon 169, p.(Tyr169Cys). The tyrosine residue is highly conserved (100 vertebrates, Multiz Alignments), and is located in the 3-oxo-5-alpha-steroid 4-dehydrogenase C-terminal domain. There is a large physicochemical difference between tyrosine and cysteine. The highest population minor allele frequency in the population database gnomAD v4.1 is 0.009% (8/91,080 alleles) in the South Asian population, consistent with recessive disease. This variant has been detected as homozygous in at least four individuals with a phenotype consistent with SRD5A3-congenital disorder of glycosylation and segregates with disease in two families (PMID: 21937992; doi: https://doi.org/10.1101/2024.01.08.23299914; ClinVar: SCV003935142.1; this individual). Computational evidence predicts a deleterious effect for the missense substitution (REVEL = 0.664) and predicts no impact on splicing (SpliceAI) for the nucleotide change. Based on the classification scheme RMH Modified ACMG/AMP Guidelines v1.7.0, this variant is classified as LIKELY PATHOGENIC. Following criteria are met: PM2_Supporting, PM3, PP1_Strong, PP3. -

Kahrizi syndrome

Pathogenic:1

Feb 16, 2025

Palindrome, Gene Kavoshgaran Aria

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Uncertain:1

Sep 07, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 21937992) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

BayesDel_addAF

Uncertain

0.16

BayesDel_noAF

Pathogenic

0.25

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.72

Eigen

Pathogenic

0.73

Eigen_PC

Uncertain

0.64

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.93

M_CAP

Uncertain

0.097

MetaRNN

Pathogenic

0.96

MetaSVM

Uncertain

-0.14

MutationAssessor

Pathogenic

3.1

PrimateAI

Uncertain

0.62

PROVEAN

Pathogenic

-6.6

REVEL

Pathogenic

0.66

Sift

Uncertain

0.0010

Sift4G

Pathogenic

0.0010

Polyphen

1.0

Vest4

0.97

MVP

0.88

MPC

0.99

ClinPred

0.94

GERP RS

5.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.66

gMVP

0.73

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