Variant chr8-60816506-G-A details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 1P and 4B. PP3BS2

The NM_017780.4(CHD7):c.2613+5G>A variant causes a splice donor 5th base, 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_donor_5th_base, intron

Scores

Splicing: ADA: 0.9996

Clinical Significance

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

Conservation

PhyloP100: 8.02

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PP3

Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.

BS2

High AC in GnomAd4 at 10 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CHD7	NM_017780.4 linkuse as main transcript	c.2613+5G>A		splice_donor_5th_base_variant, intron_variant		ENST00000423902.7	NP_060250.2

Ensembl

Gene	Transcript	HGVSc	Effect	TSL	MANE	Protein	Appris	UniProt
CHD7	ENST00000423902.7 linkuse as main transcript	c.2613+5G>A	splice_donor_5th_base_variant, intron_variant	5	NM_017780.4	ENSP00000392028	P1	Q9P2D1-1
CHD7	ENST00000524602.5 linkuse as main transcript	c.1716+35456G>A	intron_variant	1		ENSP00000437061		Q9P2D1-4
CHD7	ENST00000525508.1 linkuse as main transcript	c.2613+5G>A	splice_donor_5th_base_variant, intron_variant	5		ENSP00000436027		Q9P2D1-2
CHD7	ENST00000695853.1 linkuse as main transcript	c.2613+5G>A	splice_donor_5th_base_variant, intron_variant, NMD_transcript_variant			ENSP00000512218

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

GnomAD3 exomes

AF:

0.0000140

AC:

AN:

214848

Hom.:

AF XY:

0.00000866

AC XY:

AN XY:

115416

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 SAS 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

Gnomad4 AFR exome

AF:

0.000134

Gnomad4 AMR exome

AF:

0.0000252

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000255

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000703

Gnomad4 OTH exome

AF:

0.0000179

GnomAD4 genome

AF:

0.0000657

AC:

AN:

152226

Hom.:

Cov.:

AF XY:

0.0000806

AC XY:

AN XY:

74432

show subpopulations

Gnomad4 AFR

AF:

0.000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000333

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

Pathogenic, no assertion criteria provided

literature only

OMIM

Oct 01, 2008

- -

CHARGE syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 07, 2023

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 disrupted 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 introduces a premature termination codon (PMID: 18834967). The resulting mRNA is expected to undergo nonsense-mediated decay. 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

Uncertain significance, criteria provided, single submitter

research

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

Jul 08, 2021

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

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Apr 13, 2022

- -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Apr 01, 2021

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

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 27, 2021

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 v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.45

CADD

Benign

DANN

Benign

0.81

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over