Genetic Variant PHOX2B:p.Gln74Lys (chr4-41748391-G-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_003924.4(PHOX2B):c.220C>A(p.Gln74Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,840 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Q74H) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

PHOX2B
NM_003924.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 9.76

Publications

0 publications found

Variant links:

Genes affected

PHOX2B (HGNC:9143): (paired like homeobox 2B) The DNA-associated protein encoded by this gene is a member of the paired family of homeobox proteins localized to the nucleus. The protein functions as a transcription factor involved in the development of several major noradrenergic neuron populations and the determination of neurotransmitter phenotype. The gene product is linked to enhancement of second messenger-mediated activation of the dopamine beta-hydroylase, c-fos promoters and several enhancers, including cyclic amp-response element and serum-response element. Expansion of a 20 amino acid polyalanine tract in this protein by 5-13 aa has been associated with congenital central hypoventilation syndrome. [provided by RefSeq, Jul 2016]

PHOX2B links:

PHOX2B-AS1 (HGNC:40457): (PHOX2B antisense RNA 1)

PHOX2B-AS1 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003924.4. 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
	PHOX2B	NM_003924.4	MANE Select	c.220C>A	p.Gln74Lys	missense	Exon 1 of 3	NP_003915.2
	PHOX2B-AS1	NR_187403.1		n.43G>T		non_coding_transcript_exon	Exon 1 of 4

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
PHOX2B	ENST00000226382.4	TSL:1 MANE Select	c.220C>A	p.Gln74Lys	missense	Exon 1 of 3	ENSP00000226382.2
PHOX2B-AS1	ENST00000508038.2	TSL:5	n.99G>T		non_coding_transcript_exon	Exon 1 of 5
PHOX2B-AS1	ENST00000819353.1		n.46G>T		non_coding_transcript_exon	Exon 1 of 5

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000400

AC:

AN:

250194

AF XY:

0.00000739

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461840

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727232

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5760

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111970

Other (OTH)

AF:

0.00

AC:

AN:

60392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.55

BayesDel_addAF

Pathogenic

0.17

BayesDel_noAF

Uncertain

0.10

CADD

Pathogenic

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.38

Eigen

Uncertain

0.61

Eigen_PC

Pathogenic

0.68

FATHMM_MKL

Pathogenic

1.0

LIST_S2

Uncertain

0.92

M_CAP

Uncertain

0.14

MetaRNN

Uncertain

0.48

MetaSVM

Uncertain

0.37

MutationAssessor

Uncertain

2.1

PhyloP100

9.8

PrimateAI

Pathogenic

0.86

PROVEAN

Benign

-2.1

REVEL

Uncertain

0.60

Sift

Uncertain

0.0070

Sift4G

Benign

0.19

Polyphen

0.90

Vest4

0.53

MutPred

0.30

Gain of ubiquitination at Q74 (P = 0.009)

MVP

0.94

MPC

2.2

ClinPred

0.79

GERP RS

5.6

PromoterAI

0.028

Neutral

(source)

Varity_R

0.57

gMVP

0.93

Mutation Taster

=36/64

disease causing

(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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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over