NM_001135629.3:c.243T>C

Variant names:

• chr2-48454711-T-C
• rs148229375
• NM_001135629.3:c.243T>C

Variant summary

Our verdict is Benign. The variant received -14 ACMG points: 0P and 14B. BP4_Strong BP6 BP7 BA1

The NM_001135629.3(PPP1R21):​c.243T>C​(p.Ala81Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00389 in 1,614,020 control chromosomes in the GnomAD database, including 166 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (no stars).

• Frequency:
  • Genomes: 𝑓 0.019 (82 hom., cov: 32)
  • Exomes 𝑓: 0.0023 (84 hom.)
• Consequence: PPP1R21 NM_001135629.3 synonymous
• Clinical Significance: Benign no assertion criteria provided B:1
• Conservation: PhyloP100: -0.238
• Publications: 0 publications found

Genes affected

PPP1R21 (HGNC:30595): (protein phosphatase 1 regulatory subunit 21) Located in early endosome. [provided by Alliance of Genome Resources, Apr 2022]

PPP1R21 Gene-Disease associations (from GenCC):

• neurodevelopmental disorder with hypotonia, facial dysmorphism, and brain abnormalities

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), G2P

ACMG classification

Our verdict: Benign. The variant received -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.78).
• BP6: Variant 2-48454711-T-C is Benign according to our data. Variant chr2-48454711-T-C is described in ClinVar as [Benign]. Clinvar id is 3038850.Status of the report is no_assertion_criteria_provided, 0 stars.
• BP7: Synonymous conserved (PhyloP=-0.238 with no splicing effect.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0627 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PPP1R21	NM_001135629.3	c.243T>C	p.Ala81Ala	synonymous_variant	Exon 3 of 22	ENST00000294952.13	NP_001129101.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PPP1R21	ENST00000294952.13	c.243T>C	p.Ala81Ala	synonymous_variant	Exon 3 of 22	1	NM_001135629.3	ENSP00000294952.8

Frequencies

GnomAD3 genomes AF: 0.0195 AC: 2959 AN: 152100 Hom.: 82 Cov.: 32

Gnomad AFR AF: 0.0647

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0127

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00559

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000323

Gnomad OTH AF: 0.0182

GnomAD2 exomes AF: 0.00574 AC: 1444 AN: 251394 AF XY: 0.00456

Gnomad AFR exome AF: 0.0664

Gnomad AMR exome AF: 0.00443

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000544

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000361

Gnomad OTH exome AF: 0.00391

GnomAD4 exome AF: 0.00227 AC: 3312 AN: 1461804 Hom.: 84 Cov.: 31 AF XY: 0.00218 AC XY: 1582 AN XY: 727206

African (AFR) AF: 0.0648 AC: 2168 AN: 33466

American (AMR) AF: 0.00521 AC: 233 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39696

South Asian (SAS) AF: 0.00514 AC: 443 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53414

Middle Eastern (MID) AF: 0.00399 AC: 23 AN: 5768

European-Non Finnish (NFE) AF: 0.000148 AC: 165 AN: 1111954

Other (OTH) AF: 0.00464 AC: 280 AN: 60390

GnomAD4 genome AF: 0.0195 AC: 2968 AN: 152216 Hom.: 82 Cov.: 32 AF XY: 0.0188 AC XY: 1399 AN XY: 74430

African (AFR) AF: 0.0647 AC: 2687 AN: 41508

American (AMR) AF: 0.0127 AC: 194 AN: 15282

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5186

South Asian (SAS) AF: 0.00560 AC: 27 AN: 4824

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10604

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.000323 AC: 22 AN: 68024

Other (OTH) AF: 0.0180 AC: 38 AN: 2112

Alfa AF: 0.0106 Hom.: 20

Bravo AF: 0.0225

Asia WGS AF: 0.00404 AC: 14 AN: 3478

EpiCase AF: 0.000218

EpiControl AF: 0.000474

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: no assertion criteria provided

Submissions by phenotype

PPP1R21-related disorder Benign:1

Mar 25, 2019

PreventionGenetics, part of Exact Sciences

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.78
CADD	Benign	8.2
DANN	Benign	0.64
PhyloP100		-0.24
Mutation Taster		=100/0	polymorphism (auto)

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: rs148229375; hg19: chr2-48681850;