Genetic Variant SRRD:p.Arg21Cys (chr22-26483951-C-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001013694.3(SRRD):c.61C>T(p.Arg21Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000807 in 1,363,146 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 31)

Exomes 𝑓: 0.0000033 ( 0 hom. )

Consequence

SRRD
NM_001013694.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.859

Variant links:

Genes affected

SRRD (HGNC:33910): (SRR1 domain containing) Predicted to be involved in microtubule-based process; regulation of circadian rhythm; and regulation of heme biosynthetic process. Predicted to be active in cytoplasm and nucleus. [provided by Alliance of Genome Resources, Apr 2022]

SRRD links:

HPS4 (HGNC:15844): (HPS4 biogenesis of lysosomal organelles complex 3 subunit 2) This gene encodes a protein component of biogenesis of lysosome-related organelles complexes (BLOC). BLOC complexes are important for the formation of endosomal-lysosomal organelles such as melanosomes and platelet dense granules. Mutations in this gene result in subtype 4 of Hermansky-Pudlak syndrome, a form of albinism. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2012]

HPS4 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SRRD	NM_001013694.3 link	c.61C>T	p.Arg21Cys	missense_variant	Exon 1 of 7	ENST00000215917.11	NP_001013716.2	Q9UH36
HPS4	NM_022081.6 link	c.-756G>A		upstream_gene_variant		ENST00000398145.7	NP_071364.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SRRD	ENST00000215917.11 link	c.61C>T	p.Arg21Cys	missense_variant	Exon 1 of 7	1	NM_001013694.3	ENSP00000215917.6		Q9UH36
HPS4	ENST00000398145.7 link	c.-756G>A		upstream_gene_variant		1	NM_022081.6	ENSP00000381213.2		Q9NQG7-1

Frequencies

GnomAD3 genomes

AF:

0.0000462

AC:

AN:

151508

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000169

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000330

AC:

AN:

1211638

Hom.:

Cov.:

AF XY:

0.00000339

AC XY:

AN XY:

590382

show subpopulations

Gnomad4 AFR exome

AF:

0.000128

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000201

GnomAD4 genome

AF:

0.0000462

AC:

AN:

151508

Hom.:

Cov.:

AF XY:

0.0000406

AC XY:

AN XY:

73968

show subpopulations

Gnomad4 AFR

AF:

0.000169

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:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Feb 03, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.61C>T (p.R21C) alteration is located in exon 1 (coding exon 1) of the SRRD gene. This alteration results from a C to T substitution at nucleotide position 61, causing the arginine (R) at amino acid position 21 to be replaced by a cysteine (C). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.66

BayesDel_addAF

Pathogenic

0.24

BayesDel_noAF

Benign

-0.26

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Benign

0.16

Eigen

Benign

-0.22

Eigen_PC

Benign

-0.39

FATHMM_MKL

Benign

0.026

LIST_S2

Benign

0.62

M_CAP

Uncertain

0.14

MetaRNN

Benign

0.25

MetaSVM

Benign

-1.0

MutationAssessor

Uncertain

2.1

PrimateAI

Pathogenic

0.84

PROVEAN

Benign

-1.4

REVEL

Benign

0.082

Sift

Uncertain

0.0030

Sift4G

Pathogenic

0.0010

Polyphen

1.0

Vest4

0.24

MutPred

0.23

Loss of methylation at R21 (P = 0.0242);

MVP

0.51

MPC

0.029

ClinPred

0.86

GERP RS

0.31

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Varity_R

0.15

gMVP

0.50

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.23

Details are displayed if max score is > 0.2

DS_DG_spliceai

0.23

Position offset: -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