chr19-14093768-A-G

Position:

• chr19-14093768-A-G

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 1P and 5B. PP2 BP4 BS2

The NM_002730.4(PRKACA):​c.790T>C​(p.Ser264Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000411 in 1,461,344 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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S264C) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: PRKACA NM_002730.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.14

Genes affected

PRKACA (HGNC:9380): (protein kinase cAMP-activated catalytic subunit alpha) This gene encodes one of the catalytic subunits of protein kinase A, which exists as a tetrameric holoenzyme with two regulatory subunits and two catalytic subunits, in its inactive form. cAMP causes the dissociation of the inactive holoenzyme into a dimer of regulatory subunits bound to four cAMP and two free monomeric catalytic subunits. Four different regulatory subunits and three catalytic subunits have been identified in humans. cAMP-dependent phosphorylation of proteins by protein kinase A is important to many cellular processes, including differentiation, proliferation, and apoptosis. Constitutive activation of this gene caused either by somatic mutations, or genomic duplications of regions that include this gene, have been associated with hyperplasias and adenomas of the adrenal cortex and are linked to corticotropin-independent Cushing's syndrome. Alternative splicing results in multiple transcript variants encoding different isoforms. Tissue-specific isoforms that differ at the N-terminus have been described, and these isoforms may differ in the post-translational modifications that occur at the N-terminus of some isoforms. [provided by RefSeq, Jan 2015]

ACMG classification

Verdict is Likely_benign. Variant got -4 ACMG points.

• PP2: Missense variant where missense usually causes diseases, PRKACA
• BP4: Computational evidence support a benign effect (MetaRNN=0.384355).
• BS2: High AC in GnomAdExome4 at 6 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PRKACA	NM_002730.4	c.790T>C	p.Ser264Pro	missense_variant	9/10	ENST00000308677.9
PRKACA	NM_001304349.2	c.1018T>C	p.Ser340Pro	missense_variant	9/10
PRKACA	NM_207518.3	c.766T>C	p.Ser256Pro	missense_variant	9/10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PRKACA	ENST00000308677.9	c.790T>C	p.Ser264Pro	missense_variant	9/10	1	NM_002730.4	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.00000798 AC: 2 AN: 250712 Hom.: 0 AF XY: 0.00000738 AC XY: 1 AN XY: 135566

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000291

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000882

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000411 AC: 6 AN: 1461344 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727026

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

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: 0.00000450

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

Alfa AF: 0.0000712 Hom.: 0

Bravo AF: 0.0000113

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 26, 2023

The c.790T>C (p.S264P) alteration is located in exon 9 (coding exon 9) of the PRKACA gene. This alteration results from a T to C substitution at nucleotide position 790, causing the serine (S) at amino acid position 264 to be replaced by a proline (P). 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	Benign	0.14
BayesDel_addAF	Uncertain	0.089	D
BayesDel_noAF	Uncertain	-0.030
CADD	Uncertain	25
DANN	Benign	0.89
DEOGEN2	Benign	0.22	T;.
Eigen	Benign	-0.30
Eigen_PC	Benign	-0.025
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Benign	0.82	T;T
M_CAP	Benign	0.030	D
MetaRNN	Benign	0.38	T;T
MetaSVM	Benign	-0.98	T
MutationAssessor	Benign	-0.29	N;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.84	D
PROVEAN	Benign	-1.1	N;.
REVEL	Uncertain	0.38
Sift	Benign	0.59	T;.
Sift4G	Benign	1.0	T;T
Polyphen		0.0	B;B
Vest4		0.63
MVP		0.91
MPC		1.2
ClinPred		0.23	T
GERP RS		5.2
Varity_R		0.86
gMVP		0.86

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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

Other links and lift over

dbSNP: rs775116225; hg19: chr19-14204580;