rs772448418

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP3BS1_SupportingBS2

The NM_003924.4(PHOX2B):c.729_749delAGCGGCGGCGGCCGCGGCAGC(p.Ala244_Ala250del) variant causes a disruptive inframe deletion change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000689 in 1,161,834 control chromosomes in the GnomAD database, including 3 homozygotes. It is difficult to determine the true allele frequency of this variant because it is of type DEL_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. A243A) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000060 ( 3 hom. )

Consequence

PHOX2B
NM_003924.4 disruptive_inframe_deletion

Scores

Not classified

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2B:1

Conservation

PhyloP100: 2.19

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 Gene-Disease associations (from GenCC):

central hypoventilation syndrome, congenital, 1, with or without Hirschsprung disease
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), ClinGen, G2P
Haddad syndrome
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
neuroblastoma, susceptibility to, 2
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, G2P
congenital central hypoventilation syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

PHOX2B links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -6 ACMG points.

BP3

Nonframeshift variant in repetitive region in NM_003924.4

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.00013 (19/146078) while in subpopulation SAS AF = 0.00294 (14/4764). AF 95% confidence interval is 0.00178. There are 0 homozygotes in GnomAd4. There are 16 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High AC in GnomAd4 at 19 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PHOX2B	NM_003924.4 link	c.729_749delAGCGGCGGCGGCCGCGGCAGC	p.Ala244_Ala250del	disruptive_inframe_deletion	Exon 3 of 3	ENST00000226382.4	NP_003915.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PHOX2B	ENST00000226382.4 link	c.729_749delAGCGGCGGCGGCCGCGGCAGC	p.Ala244_Ala250del	disruptive_inframe_deletion	Exon 3 of 3	1	NM_003924.4	ENSP00000226382.2
PHOX2B	ENST00000510424.2 link	n.10_30delAGCGGCGGCGGCCGCGGCAGC		downstream_gene_variant		3

Frequencies

GnomAD3 genomes

AF:

0.000130

AC:

AN:

145980

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000985

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000688

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00294

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000537

AC:

AN:

7454

AF XY:

0.000492

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:

0.0000601

AC:

AN:

1015756

Hom.:

AF XY:

0.0000888

AC XY:

AN XY:

484012

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

20190

American (AMR)

AF:

0.00

AC:

AN:

6074

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

11022

East Asian (EAS)

AF:

0.000105

AC:

AN:

19072

South Asian (SAS)

AF:

0.00268

AC:

AN:

19392

European-Finnish (FIN)

AF:

0.00

AC:

AN:

22388

Middle Eastern (MID)

AF:

0.00

AC:

AN:

2618

European-Non Finnish (NFE)

AF:

0.00000456

AC:

AN:

876460

Other (OTH)

AF:

0.0000778

AC:

AN:

38540

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.596

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000130

AC:

AN:

146078

Hom.:

Cov.:

AF XY:

0.000225

AC XY:

AN XY:

71148

show subpopulations

African (AFR)

AF:

0.0000982

AC:

AN:

40714

American (AMR)

AF:

0.0000687

AC:

AN:

14548

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3382

East Asian (EAS)

AF:

0.00

AC:

AN:

5036

South Asian (SAS)

AF:

0.00294

AC:

AN:

4764

European-Finnish (FIN)

AF:

0.00

AC:

AN:

8918

Middle Eastern (MID)

AF:

0.00

AC:

AN:

284

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

65496

Other (OTH)

AF:

0.00

AC:

AN:

2030

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.457

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00

Hom.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2Benign:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Haddad syndrome

Uncertain:1

Jul 01, 2018

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. This variant, c.729_749del, results in the deletion of 7 amino acids of the PHOX2B protein (p.Ala254_Ala260del), but otherwise preserves the integrity of the reading frame. While this variant is present in population databases (rs772448418), the frequency information is unreliable, as metrics indicate poor data quality at this position in the ExAC database. This variant has not been reported in the literature in individuals with PHOX2B-related disease. Experimental studies and prediction algorithms are not available for this variant, and the functional significance of the deleted amino acids is currently unknown. -

not provided

Uncertain:1

May 14, 2024

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

In-frame deletion of 7 amino acids in a repetitive region with no known function; Has not been previously published as pathogenic or benign to our knowledge -

PHOX2B-related disorder

Benign:1

Jan 05, 2024

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This variant is classified as likely 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

PhyloP100

2.2

Mutation Taster

=191/9

polymorphism

(source)

Splicing

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

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over