rs202143667

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 1P and 1B. PP3BS1_Supporting

The NM_017780.4(CHD7):c.2613+5G>A variant causes a splice region, intron change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000017 in 1,473,518 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000011 ( 0 hom. )

Consequence

CHD7
NM_017780.4 splice_region, intron

Scores

Splicing: ADA: 0.9996

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:4B:1

Conservation

PhyloP100: 8.02

Publications

4 publications found

Variant links:

Genes affected

CHD7 (HGNC:20626): (chromodomain helicase DNA binding protein 7) This gene encodes a protein that contains several helicase family domains. Mutations in this gene have been found in some patients with the CHARGE syndrome. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2015]

CHD7 Gene-Disease associations (from GenCC):

CHARGE syndrome
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, PanelApp Australia, Broad Center for Mendelian Genomics, ClinGen, G2P
hypogonadotropic hypogonadism 5 with or without anosmia
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
hypogonadotropic hypogonadism
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Kallmann syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Omenn syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

CHD7 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

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

PP3

Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.0000657 (10/152226) while in subpopulation AFR AF = 0.000241 (10/41554). AF 95% confidence interval is 0.00013. There are 0 homozygotes in GnomAd4. There are 6 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

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_017780.4. 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
	CHD7	NM_017780.4	MANE Select	c.2613+5G>A		splice_region intron	N/A	NP_060250.2
	CHD7	NM_001316690.1		c.1716+35456G>A		intron	N/A	NP_001303619.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
CHD7	ENST00000423902.7	TSL:5 MANE Select	c.2613+5G>A	splice_region intron	N/A	ENSP00000392028.1
CHD7	ENST00000524602.5	TSL:1	c.1716+35456G>A	intron	N/A	ENSP00000437061.1
CHD7	ENST00000525508.1	TSL:5	c.2613+5G>A	splice_region intron	N/A	ENSP00000436027.1

Frequencies

GnomAD3 genomes

AF:

0.0000657

AC:

AN:

152108

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000140

AC:

AN:

214848

AF XY:

0.00000866

show subpopulations

Gnomad AFR exome

AF:

0.000222

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:

0.0000114

AC:

AN:

1321292

Hom.:

Cov.:

AF XY:

0.00000604

AC XY:

AN XY:

662388

show subpopulations

African (AFR)

AF:

0.000134

AC:

AN:

29956

American (AMR)

AF:

0.0000252

AC:

AN:

39666

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

24776

East Asian (EAS)

AF:

0.00

AC:

AN:

38540

South Asian (SAS)

AF:

0.0000255

AC:

AN:

78322

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52680

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5492

European-Non Finnish (NFE)

AF:

0.00000703

AC:

AN:

996074

Other (OTH)

AF:

0.0000179

AC:

AN:

55786

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.512

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:

0.0000657

AC:

AN:

152226

Hom.:

Cov.:

AF XY:

0.0000806

AC XY:

AN XY:

74432

show subpopulations

African (AFR)

AF:

0.000241

AC:

AN:

41554

American (AMR)

AF:

0.00

AC:

AN:

15298

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5178

South Asian (SAS)

AF:

0.00

AC:

AN:

4818

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10594

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67994

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.470

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:

0.0000402

Hom.:

Bravo

AF:

0.0000718

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:4Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Hypogonadotropic hypogonadism 5 with or without anosmia

Pathogenic:1

Oct 01, 2008

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

CHARGE syndrome

Uncertain:1

Sep 05, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change falls in intron 8 of the CHD7 gene. It does not directly change the encoded amino acid sequence of the CHD7 protein. RNA analysis indicates that this variant induces altered splicing and may result in an absent or altered protein product. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has been observed in individual(s) with hypogonadotropic hypogonadism (PMID: 18834967, 29419413, 34837038). This variant is also known as IVS8+5G>A. ClinVar contains an entry for this variant (Variation ID: 2035). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Studies have shown that this variant results in skipping of exon 8, and produces a non-functional protein and/or introduces a premature termination codon (PMID: 18834967). 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.

Childhood onset hearing loss

Uncertain:1

Jul 08, 2021

National Institute on Deafness and Communication Disorders, National Institutes of Health

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:research

PS3_moderate, PP3 / Modifications from PMID: 30311386 for classification: The genetic causes of hearing loss have not yet been well characterized in the Yoruba population, and the information regarding variant MAF in this population is still limited, so we did not exclude any variant based on their "high" MAF. PP3 criteria was applied even if the REVEL score was below 0.7, if at least two of the pathogenicity prediction algorithms used predicted that the variant was damaging or likely damaging.

CHARGE syndrome;C3552553:Hypogonadotropic hypogonadism 5 with or without anosmia

Uncertain:1

Apr 13, 2022

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

not provided

Uncertain:1

Apr 01, 2021

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Observed in multiple unrelated individuals with hypogonadotrophic hypogonadism; the variant was inherited from an unaffected mother in one family, and another family also harbored a frameshift variant in the FGFR1 gene (Kim et al., 2008; Zhang et al., 2019; Cassatella et al., 2018; Xu et al., 2018); Published functional studies confirm variant results in skipping of exon 8, and is predicted to result in a frameshift and subsequent protein truncation (Kim et al., 2008); This variant is associated with the following publications: (PMID: 29144511, 29419413, 18834967)

Inborn genetic diseases

Benign:1

Aug 27, 2021

Ambry Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity.

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.45

CADD

Benign

(source)

DANN

Benign

0.81

PhyloP100

8.0

Mutation Taster

=7/93

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.84

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over