Genetic Variant PHC3:p.Lys913Asn (chr3-170102573-T-G) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_024947.4(PHC3):c.2739A>C(p.Lys913Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,616 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

PHC3
NM_024947.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.205

Publications

0 publications found

Variant links:

Genes affected

PHC3 (HGNC:15682): (polyhomeotic homolog 3) Predicted to enable chromatin binding activity and histone binding activity. Predicted to be involved in negative regulation of transcription, DNA-templated. Located in nucleoplasm. Part of PRC1 complex. [provided by Alliance of Genome Resources, Apr 2022]

PHC3 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.2530973).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PHC3	NM_024947.4 link	c.2739A>C	p.Lys913Asn	missense_variant	Exon 14 of 15	ENST00000495893.7	NP_079223.3	Q8NDX5-7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
PHC3	ENST00000495893.7 link	c.2739A>C	p.Lys913Asn	missense_variant	Exon 14 of 15	1	NM_024947.4	ENSP00000420294.1	Q8NDX5-7
PHC3	ENST00000494943.5 link	c.2703A>C	p.Lys901Asn	missense_variant	Exon 14 of 15	1		ENSP00000420271.1	Q8NDX5-1
PHC3	ENST00000484068.5 link	c.234A>C	p.Lys78Asn	missense_variant	Exon 2 of 4	4		ENSP00000418835.1	H7C528
PHC3	ENST00000467570.5 link	c.*68A>C		3_prime_UTR_variant	Exon 13 of 13	2		ENSP00000419089.1	E7EX82

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000402

AC:

AN:

248842

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000887

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1461616

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727096

show subpopulations

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

African (AFR)

AF:

0.00

AC:

AN:

33478

American (AMR)

AF:

0.00

AC:

AN:

44712

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39690

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53384

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111822

Other (OTH)

AF:

0.0000166

AC:

AN:

60370

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.029673), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.400

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000827

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jun 04, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.2739A>C (p.K913N) alteration is located in exon 14 (coding exon 14) of the PHC3 gene. This alteration results from a A to C substitution at nucleotide position 2739, causing the lysine (K) at amino acid position 913 to be replaced by an asparagine (N). 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

0.31

BayesDel_addAF

Benign

-0.18

BayesDel_noAF

Benign

-0.50

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.047

.;T

Eigen

Benign

-0.48

Eigen_PC

Benign

-0.50

FATHMM_MKL

Benign

0.69

LIST_S2

Uncertain

0.91

D;D

M_CAP

Benign

0.018

MetaRNN

Benign

0.25

T;T

MetaSVM

Benign

-0.98

MutationAssessor

Benign

1.5

.;L

PhyloP100

-0.20

PrimateAI

Uncertain

0.79

PROVEAN

Benign

-0.24

N;N

REVEL

Benign

0.13

Sift

Benign

0.17

T;T

Sift4G

Benign

0.48

T;T

Polyphen

0.98

D;D

Vest4

0.42

MutPred

0.35

.;Gain of catalytic residue at K901 (P = 0.0034);

MVP

0.41

MPC

0.63

ClinPred

0.39

GERP RS

-3.3

PromoterAI

0.021

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.069

gMVP

0.56

Mutation Taster

=94/6

polymorphism

(source)

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

Publications

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3-170102573-T-G

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over