NM_000348.4:c.88_89insT

Variant names:

• chr2-31580812-G-GA
• rs61748121
• NM_000348.4:c.88_89insT

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_000348.4(SRD5A2):​c.88_89insT​(p.Pro30LeufsTer106) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 35)
• Consequence: SRD5A2 NM_000348.4 frameshift
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.76
• Publications: 2 publications found

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]

SRD5A2 Gene-Disease associations (from GenCC):

• 46,XY disorder of sex development due to 5-alpha-reductase 2 deficiency

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 75 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SRD5A2	NM_000348.4	c.88_89insT	p.Pro30LeufsTer106	frameshift_variant	Exon 1 of 5	ENST00000622030.2	NP_000339.2
SRD5A2	XM_011533072.3	c.27-47047_27-47046insT		intron_variant	Intron 3 of 6		XP_011531374.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SRD5A2	ENST00000622030.2	c.88_89insT	p.Pro30LeufsTer106	frameshift_variant	Exon 1 of 5	1	NM_000348.4	ENSP00000477587.1

Frequencies

GnomAD3 genomes Cov.: 35

GnomAD2 exomes AF: 0.0179 AC: 2 AN: 112 AF XY: 0.0161

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.167

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0192

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 37

GnomAD4 genome Cov.: 35

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		2.8

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: rs61748121; hg19: chr2-31805881;