NM_000492.4(CFTR):c.2908+4C>A AND Cystic fibrosis

Germline classification:: Uncertain significance (2 submissions)
Last evaluated:: May 30, 2022
Review status:: 2 stars out of maximum of 4 stars
criteria provided, multiple submitters, no conflicts

Somatic classification of clinical impact:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Somatic classification of oncogenicity:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Record status:: current
Accession:: RCV002440575.4

Allele description [Variation Report for NM_000492.4(CFTR):c.2908+4C>A]

NM_000492.4(CFTR):c.2908+4C>A

Gene:

CFTR:CF transmembrane conductance regulator [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

7q31.2

Genomic location:

Preferred name:

NM_000492.4(CFTR):c.2908+4C>A

HGVS:

NC_000007.14:g.117603786C>A
NG_016465.4:g.143003C>A
NM_000492.4:c.2908+4C>AMANE SELECT
LRG_663t1:c.2908+4C>A
LRG_663:g.143003C>A
NC_000007.13:g.117243840C>A
NM_000492.3:c.2908+4C>A

Links:

dbSNP: rs372266030

NCBI 1000 Genomes Browser:

rs372266030

Molecular consequence:

NM_000492.4:c.2908+4C>A - intron variant - [Sequence Ontology: SO:0001627]

Condition(s)

Name:: Cystic fibrosis (CF)
Synonyms:: Mucoviscidosis
Identifiers:: MONDO: MONDO:0009061; MedGen: C0010674; Orphanet: 586; OMIM: 219700

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV002751894	Ambry Genetics	criteria provided, single submitter (Ambry Variant Classification Scheme 2023)	Uncertain significance (Mar 25, 2022)	germline	clinical testing	Citation Link,
SCV003507037	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (May 30, 2022)	germline	clinical testing	PubMed (3) [See all records that cite these PMIDs] 17576681, 9536098, 28492532

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV002751894

Ambry Genetics

criteria provided, single submitter

(Ambry Variant Classification Scheme 2023)

Uncertain significance
(Mar 25, 2022)

germline

clinical testing

Citation Link,

SCV003507037

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(May 30, 2022)

germline

clinical testing

PubMed (3)
[See all records that cite these PMIDs]

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing

Citations

PubMed

Aberrant 5' splice sites in human disease genes: mutation pattern, nucleotide structure and comparison of computational tools that predict their utilization.

Buratti E, Chivers M, Královicová J, Romano M, Baralle M, Krainer AR, Vorechovsky I.

Nucleic Acids Res. 2007;35(13):4250-63. Epub 2007 Jun 18.

PubMed [citation]

PMID:: 17576681
PMCID:: PMC1934990

Statistical features of human exons and their flanking regions.

Zhang MQ.

Hum Mol Genet. 1998 May;7(5):919-32.

PubMed [citation]

PMID:: 9536098

See all PubMed Citations (3)

Details of each submission

From Ambry Genetics, SCV002751894.2

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	not provided

Description

The c.2908+4C>A intronic variant results from a C to A substitution 4 nucleotides after coding exon 17 in the CFTR gene. This nucleotide position is not well conserved in available vertebrate species. In silico splice site analysis predicts that this alteration will not have any significant effect on splicing. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Labcorp Genetics (formerly Invitae), Labcorp, SCV003507037.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (3)

Description

This sequence change falls in intron 17 of the CFTR gene. It does not directly change the encoded amino acid sequence of the CFTR protein. It affects a nucleotide within the consensus splice site. This variant is present in population databases (rs372266030, gnomAD 0.03%). This variant has not been reported in the literature in individuals affected with CFTR-related conditions. ClinVar contains an entry for this variant (Variation ID: 596852). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant is not likely to affect RNA splicing. 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.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Sep 29, 2024

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