Genetic Variant NHP2:n.58G>C (chr5-178153827-C-G) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The ENST00000510363.1(NHP2):n.58G>C variant causes a non coding transcript exon change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000414 in 1,450,266 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000041 ( 0 hom. )

Consequence

NHP2
ENST00000510363.1 non_coding_transcript_exon

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -2.14

Publications

0 publications found

Variant links:

Genes affected

NHP2 (HGNC:14377): (NHP2 ribonucleoprotein) This gene is a member of the H/ACA snoRNPs (small nucleolar ribonucleoproteins) gene family. snoRNPs are involved in various aspects of rRNA processing and modification and have been classified into two families: C/D and H/ACA. The H/ACA snoRNPs also include the DKC1, NOLA1 and NOLA3 proteins. These four H/ACA snoRNP proteins localize to the dense fibrillar components of nucleoli and to coiled (Cajal) bodies in the nucleus. Both 18S rRNA production and rRNA pseudouridylation are impaired if any one of the four proteins is depleted. The four H/ACA snoRNP proteins are also components of the telomerase complex. This gene encodes a protein related to Saccharomyces cerevisiae Nhp2p. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Oct 2008]

NHP2 Gene-Disease associations (from GenCC):

dyskeratosis congenita, autosomal recessive 2
Inheritance: AR Classification: STRONG, MODERATE Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
dyskeratosis congenita
Inheritance: AD, AR Classification: SUPPORTIVE, LIMITED Submitted by: Orphanet, ClinGen

NHP2 links:

ENSG00000289726 (HGNC:):

ENSG00000289726 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -4 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.75).

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	Exon rank	MANE	Protein	UniProt
NHP2	NM_017838.4 link	c.-10G>C	5_prime_UTR_variant	Exon 1 of 4	ENST00000274606.8	NP_060308.1	Q9NX24
NHP2	NM_001396110.1 link	c.-10G>C	5_prime_UTR_variant	Exon 1 of 5		NP_001383039.1
NHP2	NM_001034833.2 link	c.-10G>C	5_prime_UTR_variant	Exon 1 of 3		NP_001030005.1	Q9NX24J3QSY4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NHP2	ENST00000274606.8 link	c.-10G>C		5_prime_UTR_variant	Exon 1 of 4	1	NM_017838.4	ENSP00000274606.4		Q9NX24

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000448

AC:

AN:

223090

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000414

AC:

AN:

1450266

Hom.:

Cov.:

AF XY:

0.00000416

AC XY:

AN XY:

720840

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33192

American (AMR)

AF:

0.00

AC:

AN:

42624

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25868

East Asian (EAS)

AF:

0.00

AC:

AN:

39022

South Asian (SAS)

AF:

0.0000235

AC:

AN:

84940

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52106

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5750

European-Non Finnish (NFE)

AF:

0.00000361

AC:

AN:

1106898

Other (OTH)

AF:

0.00

AC:

AN:

59866

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.483

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

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.75

CADD

Benign

2.9

(source)

DANN

Benign

0.59

PhyloP100

-2.1

PromoterAI

0.0098

Neutral

(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

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over