NM_000944.5:c.1339G>A

Variant names:

• chr4-101032267-C-T
• rs1553920374
• NM_000944.5:c.1339G>A

Variant summary

Our verdict is Pathogenic. The variant received 14 ACMG points: 14P and 0B. PM2 PP3_Strong PP5_Very_Strong

The NM_000944.5(PPP3CA):​c.1339G>A​(p.Ala447Thr) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000693 in 1,443,146 control chromosomes in the GnomAD database, with no homozygous occurrence. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A447P) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: PPP3CA NM_000944.5 missense, splice_region
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: 7.62
• Publications: 0 publications found

Genes affected

PPP3CA (HGNC:9314): (protein phosphatase 3 catalytic subunit alpha) Enables several functions, including ATPase binding activity; calmodulin binding activity; and calmodulin-dependent protein phosphatase activity. Involved in several processes, including calcineurin-NFAT signaling cascade; peptidyl-serine dephosphorylation; and response to calcium ion. Located in several cellular components, including cytosol; dendritic spine; and nucleoplasm. Part of calcineurin complex. Colocalizes with cytoplasmic side of plasma membrane. Implicated in developmental and epileptic encephalopathy 91. Biomarker of focal segmental glomerulosclerosis and schizophrenia. [provided by Alliance of Genome Resources, Apr 2022]

PPP3CA Gene-Disease associations (from GenCC):

• arthrogryposis, cleft palate, craniosynostosis, and impaired intellectual development

  Inheritance: AD Classification: STRONG, SUPPORTIVE, LIMITED Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics
• developmental and epileptic encephalopathy 91

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
• autosomal dominant non-syndromic intellectual disability

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• undetermined early-onset epileptic encephalopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 14 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.
• PP5: Variant 4-101032267-C-T is Pathogenic according to our data. Variant chr4-101032267-C-T is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 441273.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000944.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PPP3CA	NM_000944.5	MANE Select	c.1339G>A	p.Ala447Thr	missense splice_region	Exon 12 of 14	NP_000935.1
	PPP3CA	NM_001130691.2		c.1339G>A	p.Ala447Thr	missense splice_region	Exon 12 of 13	NP_001124163.1
	PPP3CA	NM_001130692.2		c.1213G>A	p.Ala405Thr	missense splice_region	Exon 11 of 12	NP_001124164.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PPP3CA	ENST00000394854.8	TSL:1 MANE Select	c.1339G>A	p.Ala447Thr	missense splice_region	Exon 12 of 14	ENSP00000378323.3
	PPP3CA	ENST00000394853.8	TSL:1	c.1339G>A	p.Ala447Thr	missense splice_region	Exon 12 of 13	ENSP00000378322.4
	PPP3CA	ENST00000323055.10	TSL:1	c.1213G>A	p.Ala405Thr	missense splice_region	Exon 11 of 12	ENSP00000320580.6

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.93e-7 AC: 1 AN: 1443146 Hom.: 0 Cov.: 30 AF XY: 0.00000139 AC XY: 1 AN XY: 717110

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 32592

American (AMR) AF: 0.00 AC: 0 AN: 41426

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25216

East Asian (EAS) AF: 0.00 AC: 0 AN: 38936

South Asian (SAS) AF: 0.00 AC: 0 AN: 82900

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52976

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5678

European-Non Finnish (NFE) AF: 9.06e-7 AC: 1 AN: 1103880

Other (OTH) AF: 0.00 AC: 0 AN: 59542

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic/Likely pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
3	-	-	Developmental and epileptic encephalopathy 91 (3)
2	-	-	not provided (2)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.79
BayesDel_addAF	Uncertain	0.096	D
BayesDel_noAF	Benign	-0.10
CADD	Pathogenic	34
DANN	Uncertain	1.0
DEOGEN2	Benign	0.33	T
Eigen	Uncertain	0.53
Eigen_PC	Uncertain	0.57
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Benign	0.022	T
MetaRNN	Uncertain	0.47	T
MetaSVM	Benign	-1.2	T
MutationAssessor	Uncertain	2.8	M
PhyloP100		7.6
PrimateAI	Pathogenic	0.82	D
PROVEAN	Benign	-1.3	N
REVEL	Benign	0.23
Sift	Benign	0.25	T
Sift4G	Benign	0.081	T
Polyphen		1.0	D
Vest4		0.65
MutPred		0.41		Gain of catalytic residue at A447 (P = 0.0402)
MVP		0.61
MPC		1.8
ClinPred		0.99	D
GERP RS		5.4
Varity_R		0.21
gMVP		0.83
Mutation Taster		=4/96	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.99
SpliceAI score (max)		0.61		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.61		Position offset: 0

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1553920374; hg19: chr4-101953424;