rs757144691

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_139320.2(CHRFAM7A):c.665T>C(p.Val222Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000333 in 150,166 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 28)

Exomes 𝑓: 0.000019 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

CHRFAM7A
NM_139320.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 8.59

Variant links:

Genes affected

CHRFAM7A (HGNC:15781): (CHRNA7 (exons 5-10) and FAM7A (exons A-E) fusion) The nicotinic acetylcholine receptors (nAChRs) are members of a superfamily of ligand-gated ion channels that mediate fast signal transmission at synapses. The family member CHRNA7, which is located on chromosome 15 in a region associated with several neuropsychiatric disorders, is partially duplicated and forms a hybrid with a novel gene from the family with sequence similarity 7 (FAM7A). Alternative splicing has been observed, and two variants exist, for this hybrid gene. The N-terminally truncated products predicted by the largest open reading frames for each variant would lack the majority of the neurotransmitter-gated ion-channel ligand binding domain but retain the transmembrane region that forms the ion channel. Although current evidence supports transcription of this hybrid gene, translation of the nicotinic acetylcholine receptor-like protein-encoding open reading frames has not been confirmed. [provided by RefSeq, Jul 2008]

CHRFAM7A links:

LOC105370751 (HGNC:):

LOC105370751 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.853

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHRFAM7A	NM_139320.2 link	c.665T>C	p.Val222Ala	missense_variant	Exon 9 of 10	ENST00000299847.7	NP_647536.1	Q494W8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
CHRFAM7A	ENST00000299847.7 link	c.665T>C	p.Val222Ala	missense_variant	Exon 9 of 10	1	NM_139320.2	ENSP00000299847.3	Q494W8
CHRFAM7A	ENST00000401522.7 link	c.392T>C	p.Val131Ala	missense_variant	Exon 10 of 11	1		ENSP00000385389.3	A0A0A6YYA8
CHRFAM7A	ENST00000397827.7 link	c.392T>C	p.Val131Ala	missense_variant	Exon 8 of 9	5		ENSP00000380927.3	A0A0A6YYA8
CHRFAM7A	ENST00000692430.1 link	n.617T>C		non_coding_transcript_exon_variant	Exon 4 of 5

Frequencies

GnomAD3 genomes

AF:

0.0000333

AC:

AN:

150166

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.0000945

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000593

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000280

AC:

AN:

250260

Hom.:

AF XY:

0.0000296

AC XY:

AN XY:

135270

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 SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000139

Gnomad NFE exome

AF:

0.0000354

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.0000185

AC:

AN:

1456822

Hom.:

Cov.:

AF XY:

0.0000166

AC XY:

AN XY:

724826

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.000131

Gnomad4 NFE exome

AF:

0.0000171

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000333

AC:

AN:

150166

Hom.:

Cov.:

AF XY:

0.0000273

AC XY:

AN XY:

73270

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.0000945

Gnomad4 NFE

AF:

0.0000593

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000159

Hom.:

ExAC

AF:

0.0000743

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

May 14, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.665T>C (p.V222A) alteration is located in exon 9 (coding exon 7) of the CHRFAM7A gene. This alteration results from a T to C substitution at nucleotide position 665, causing the valine (V) at amino acid position 222 to be replaced by an alanine (A). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.94

BayesDel_addAF

Uncertain

0.092

BayesDel_noAF

Uncertain

0.030

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.42

T;.;.

Eigen

Uncertain

0.67

Eigen_PC

Uncertain

0.55

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.96

D;D;.

M_CAP

Benign

0.074

MetaRNN

Pathogenic

0.85

D;D;D

MetaSVM

Uncertain

0.59

MutationAssessor

Pathogenic

3.9

H;.;.

PROVEAN

Uncertain

-3.6

D;D;D

REVEL

Pathogenic

0.80

Sift

Uncertain

0.0010

D;D;D

Sift4G

Uncertain

0.0020

D;D;D

Polyphen

1.0

D;.;.

Vest4

0.89

MutPred

0.64

Loss of sheet (P = 0.0043);.;.;

MVP

0.64

ClinPred

0.99

GERP RS

3.2

Varity_R

0.60

gMVP

0.71

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

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